----
-=== src/third_party/nonstd/expected.hpp
+=== src/third_party/nonstd/span.hpp
This is the single header version of
-https://github.com/martinmoene/expected-lite[expected-lite] 0.6.2 with the
+https://github.com/martinmoene/span-lite[expected-lite] 0.10.3 with the
following license:
----
-Copyright (c) 2016-2020 Martin Moene
+Copyright (c) 2018-2021 Martin Moene
Boost Software License - Version 1.0 - August 17th, 2003
----
-=== src/third_party/nonstd/span.hpp
+=== src/third_party/tl/expected.hpp
-This is the single header version of
-https://github.com/martinmoene/span-lite[expected-lite] 0.10.3 with the
-following license:
+This is https://github.com/TartanLlama/expected[TartanLlama expected] 1.1.0 with
+the following license:
----
-Copyright (c) 2018-2021 Martin Moene
+Creative Commons Legal Code
-Boost Software License - Version 1.0 - August 17th, 2003
+CC0 1.0 Universal
-Permission is hereby granted, free of charge, to any person or organization
-obtaining a copy of the software and accompanying documentation covered by
-this license (the "Software") to use, reproduce, display, distribute,
-execute, and transmit the Software, and to prepare derivative works of the
-Software, and to permit third-parties to whom the Software is furnished to
-do so, all subject to the following:
+ CREATIVE COMMONS CORPORATION IS NOT A LAW FIRM AND DOES NOT PROVIDE
+ LEGAL SERVICES. DISTRIBUTION OF THIS DOCUMENT DOES NOT CREATE AN
+ ATTORNEY-CLIENT RELATIONSHIP. CREATIVE COMMONS PROVIDES THIS
+ INFORMATION ON AN "AS-IS" BASIS. CREATIVE COMMONS MAKES NO WARRANTIES
+ REGARDING THE USE OF THIS DOCUMENT OR THE INFORMATION OR WORKS
+ PROVIDED HEREUNDER, AND DISCLAIMS LIABILITY FOR DAMAGES RESULTING FROM
+ THE USE OF THIS DOCUMENT OR THE INFORMATION OR WORKS PROVIDED
+ HEREUNDER.
-The copyright notices in the Software and this entire statement, including
-the above license grant, this restriction and the following disclaimer,
-must be included in all copies of the Software, in whole or in part, and
-all derivative works of the Software, unless such copies or derivative
-works are solely in the form of machine-executable object code generated by
-a source language processor.
+Statement of Purpose
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
-SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
-FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
-ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
-DEALINGS IN THE SOFTWARE.
+The laws of most jurisdictions throughout the world automatically confer
+exclusive Copyright and Related Rights (defined below) upon the creator
+and subsequent owner(s) (each and all, an "owner") of an original work of
+authorship and/or a database (each, a "Work").
+
+Certain owners wish to permanently relinquish those rights to a Work for
+the purpose of contributing to a commons of creative, cultural and
+scientific works ("Commons") that the public can reliably and without fear
+of later claims of infringement build upon, modify, incorporate in other
+works, reuse and redistribute as freely as possible in any form whatsoever
+and for any purposes, including without limitation commercial purposes.
+These owners may contribute to the Commons to promote the ideal of a free
+culture and the further production of creative, cultural and scientific
+works, or to gain reputation or greater distribution for their Work in
+part through the use and efforts of others.
+
+For these and/or other purposes and motivations, and without any
+expectation of additional consideration or compensation, the person
+associating CC0 with a Work (the "Affirmer"), to the extent that he or she
+is an owner of Copyright and Related Rights in the Work, voluntarily
+elects to apply CC0 to the Work and publicly distribute the Work under its
+terms, with knowledge of his or her Copyright and Related Rights in the
+Work and the meaning and intended legal effect of CC0 on those rights.
+
+1. Copyright and Related Rights. A Work made available under CC0 may be
+protected by copyright and related or neighboring rights ("Copyright and
+Related Rights"). Copyright and Related Rights include, but are not
+limited to, the following:
+
+ i. the right to reproduce, adapt, distribute, perform, display,
+ communicate, and translate a Work;
+ ii. moral rights retained by the original author(s) and/or performer(s);
+iii. publicity and privacy rights pertaining to a person's image or
+ likeness depicted in a Work;
+ iv. rights protecting against unfair competition in regards to a Work,
+ subject to the limitations in paragraph 4(a), below;
+ v. rights protecting the extraction, dissemination, use and reuse of data
+ in a Work;
+ vi. database rights (such as those arising under Directive 96/9/EC of the
+ European Parliament and of the Council of 11 March 1996 on the legal
+ protection of databases, and under any national implementation
+ thereof, including any amended or successor version of such
+ directive); and
+vii. other similar, equivalent or corresponding rights throughout the
+ world based on applicable law or treaty, and any national
+ implementations thereof.
+
+2. Waiver. To the greatest extent permitted by, but not in contravention
+of, applicable law, Affirmer hereby overtly, fully, permanently,
+irrevocably and unconditionally waives, abandons, and surrenders all of
+Affirmer's Copyright and Related Rights and associated claims and causes
+of action, whether now known or unknown (including existing as well as
+future claims and causes of action), in the Work (i) in all territories
+worldwide, (ii) for the maximum duration provided by applicable law or
+treaty (including future time extensions), (iii) in any current or future
+medium and for any number of copies, and (iv) for any purpose whatsoever,
+including without limitation commercial, advertising or promotional
+purposes (the "Waiver"). Affirmer makes the Waiver for the benefit of each
+member of the public at large and to the detriment of Affirmer's heirs and
+successors, fully intending that such Waiver shall not be subject to
+revocation, rescission, cancellation, termination, or any other legal or
+equitable action to disrupt the quiet enjoyment of the Work by the public
+as contemplated by Affirmer's express Statement of Purpose.
+
+3. Public License Fallback. Should any part of the Waiver for any reason
+be judged legally invalid or ineffective under applicable law, then the
+Waiver shall be preserved to the maximum extent permitted taking into
+account Affirmer's express Statement of Purpose. In addition, to the
+extent the Waiver is so judged Affirmer hereby grants to each affected
+person a royalty-free, non transferable, non sublicensable, non exclusive,
+irrevocable and unconditional license to exercise Affirmer's Copyright and
+Related Rights in the Work (i) in all territories worldwide, (ii) for the
+maximum duration provided by applicable law or treaty (including future
+time extensions), (iii) in any current or future medium and for any number
+of copies, and (iv) for any purpose whatsoever, including without
+limitation commercial, advertising or promotional purposes (the
+"License"). The License shall be deemed effective as of the date CC0 was
+applied by Affirmer to the Work. Should any part of the License for any
+reason be judged legally invalid or ineffective under applicable law, such
+partial invalidity or ineffectiveness shall not invalidate the remainder
+of the License, and in such case Affirmer hereby affirms that he or she
+will not (i) exercise any of his or her remaining Copyright and Related
+Rights in the Work or (ii) assert any associated claims and causes of
+action with respect to the Work, in either case contrary to Affirmer's
+express Statement of Purpose.
+
+4. Limitations and Disclaimers.
+
+ a. No trademark or patent rights held by Affirmer are waived, abandoned,
+ surrendered, licensed or otherwise affected by this document.
+ b. Affirmer offers the Work as-is and makes no representations or
+ warranties of any kind concerning the Work, express, implied,
+ statutory or otherwise, including without limitation warranties of
+ title, merchantability, fitness for a particular purpose, non
+ infringement, or the absence of latent or other defects, accuracy, or
+ the present or absence of errors, whether or not discoverable, all to
+ the greatest extent permissible under applicable law.
+ c. Affirmer disclaims responsibility for clearing rights of other persons
+ that may apply to the Work or any use thereof, including without
+ limitation any person's Copyright and Related Rights in the Work.
+ Further, Affirmer disclaims responsibility for obtaining any necessary
+ consents, permissions or other rights required for any use of the
+ Work.
+ d. Affirmer understands and acknowledges that Creative Commons is not a
+ party to this document and has no duty or obligation with respect to
+ this CC0 or use of the Work.
----
return *this;
}
-nonstd::expected<void, std::string>
+tl::expected<void, std::string>
Hash::hash_fd(int fd)
{
return util::read_fd(
fd, [this](nonstd::span<const uint8_t> data) { hash(data); });
}
-nonstd::expected<void, std::string>
+tl::expected<void, std::string>
Hash::hash_file(const std::string& path)
{
Fd fd(open(path.c_str(), O_RDONLY | O_BINARY));
if (!fd) {
LOG("Failed to open {}: {}", path, strerror(errno));
- return nonstd::make_unexpected(strerror(errno));
+ return tl::unexpected(strerror(errno));
}
return hash_fd(*fd);
#pragma once
#include "third_party/blake3/blake3.h"
-#include <third_party/nonstd/expected.hpp>
#include <third_party/nonstd/span.hpp>
+#include <third_party/tl/expected.hpp>
#include <array>
#include <cstdint>
//
// If hash debugging is enabled, the data is written verbatim to the text
// input file.
- nonstd::expected<void, std::string> hash_file(const std::string& path);
+ tl::expected<void, std::string> hash_file(const std::string& path);
// Add contents read from an open file descriptor to the hash.
//
// If hash debugging is enabled, the data is written verbatim to the text
// input file.
- nonstd::expected<void, std::string> hash_fd(int fd);
+ tl::expected<void, std::string> hash_fd(int fd);
private:
blake3_hasher m_hasher;
namespace {
-// Return nonstd::make_unexpected<Failure> if ccache did not succeed in getting
+// Return tl::unexpected<Failure> if ccache did not succeed in getting
// or putting a result in the cache. If `exit_code` is set, ccache will just
// exit with that code directly, otherwise execute the real compiler and exit
// with its exit code. Statistics counters will also be incremented.
// - Makes include file paths for which the base directory is a prefix relative
// when computing the hash sum.
// - Stores the paths and hashes of included files in ctx.included_files.
-static nonstd::expected<void, Failure>
+static tl::expected<void, Failure>
process_preprocessed_file(Context& ctx, Hash& hash, const std::string& path)
{
auto data = util::read_file<std::string>(path);
if (!data) {
LOG("Failed to read {}: {}", path, data.error());
- return nonstd::make_unexpected(Statistic::internal_error);
+ return tl::unexpected(Statistic::internal_error);
}
std::unordered_map<std::string, std::string> relative_inc_path_cache;
q++;
if (q >= end) {
LOG_RAW("Failed to parse included file path");
- return nonstd::make_unexpected(Statistic::internal_error);
+ return tl::unexpected(Statistic::internal_error);
}
// q points to the beginning of an include file path
hash.hash(p, q - p);
if (remember_include_file(ctx, inc_path, hash, system, nullptr)
== RememberIncludeFileResult::cannot_use_pch) {
- return nonstd::make_unexpected(
- Statistic::could_not_use_precompiled_header);
+ return tl::unexpected(Statistic::could_not_use_precompiled_header);
}
p = q; // Everything of interest between p and q has been hashed now.
} else if (strncmp(q, incbin_directive, sizeof(incbin_directive)) == 0
LOG_RAW(
"Found potential unsupported .inc"
"bin directive in source code");
- return nonstd::make_unexpected(
- Failure(Statistic::unsupported_code_directive));
+ return tl::unexpected(Failure(Statistic::unsupported_code_directive));
} else if (strncmp(q, "___________", 10) == 0
&& (q == data->data() || q[-1] == '\n')) {
// Unfortunately the distcc-pump wrapper outputs standard output lines:
// Execute the compiler/preprocessor, with logic to retry without requesting
// colored diagnostics messages if that fails.
-static nonstd::expected<DoExecuteResult, Failure>
+static tl::expected<DoExecuteResult, Failure>
do_execute(Context& ctx, Args& args, const bool capture_stdout = true)
{
util::UmaskScope umask_scope(ctx.original_umask);
LOG("Failed to read {} (cleanup in progress?): {}",
tmp_stdout.path,
stdout_data_result.error());
- return nonstd::make_unexpected(Statistic::missing_cache_file);
+ return tl::unexpected(Statistic::missing_cache_file);
}
stdout_data = *stdout_data_result;
}
LOG("Failed to read {} (cleanup in progress?): {}",
tmp_stderr.path,
stderr_data_result.error());
- return nonstd::make_unexpected(Statistic::missing_cache_file);
+ return tl::unexpected(Statistic::missing_cache_file);
}
return DoExecuteResult{status, stdout_data, *stderr_data_result};
}
// Run the real compiler and put the result in cache. Returns the result key.
-static nonstd::expected<Hash::Digest, Failure>
+static tl::expected<Hash::Digest, Failure>
to_cache(Context& ctx,
Args& args,
std::optional<Hash::Digest> result_key,
if (unlink(ctx.args_info.output_dwo.c_str()) != 0 && errno != ENOENT
&& errno != ESTALE) {
LOG("Failed to unlink {}: {}", ctx.args_info.output_dwo, strerror(errno));
- return nonstd::make_unexpected(Statistic::bad_output_file);
+ return tl::unexpected(Statistic::bad_output_file);
}
}
LOG_RAW("Running real compiler");
MTR_BEGIN("execute", "compiler");
- nonstd::expected<DoExecuteResult, Failure> result;
+ tl::expected<DoExecuteResult, Failure> result;
if (!ctx.config.depend_mode()) {
result = do_execute(ctx, args);
args.pop_back(3);
MTR_END("execute", "compiler");
if (!result) {
- return nonstd::make_unexpected(result.error());
+ return tl::unexpected(result.error());
}
// Merge stderr from the preprocessor (if any) and stderr from the real
auto failure = Failure(Statistic::compile_failed);
failure.set_exit_code(result->exit_status);
- return nonstd::make_unexpected(failure);
+ return tl::unexpected(failure);
}
if (ctx.config.depend_mode()) {
ASSERT(false);
}
if (!result_key) {
- return nonstd::make_unexpected(Statistic::internal_error);
+ return tl::unexpected(Statistic::internal_error);
}
LOG_RAW("Got result key from dependency file");
LOG("Result key: {}", util::format_digest(*result_key));
obj_stat = Stat::stat(ctx.args_info.output_obj);
if (!obj_stat) {
LOG_RAW("Compiler didn't produce an object file");
- return nonstd::make_unexpected(Statistic::compiler_produced_no_output);
+ return tl::unexpected(Statistic::compiler_produced_no_output);
} else if (obj_stat.size() == 0) {
LOG_RAW("Compiler produced an empty object file");
- return nonstd::make_unexpected(Statistic::compiler_produced_empty_output);
+ return tl::unexpected(Statistic::compiler_produced_empty_output);
}
}
MTR_BEGIN("result", "result_put");
if (!write_result(
ctx, *result_key, obj_stat, result->stdout_data, result->stderr_data)) {
- return nonstd::make_unexpected(Statistic::compiler_produced_no_output);
+ return tl::unexpected(Statistic::compiler_produced_no_output);
}
MTR_END("result", "result_put");
// Find the result key by running the compiler in preprocessor mode and
// hashing the result.
-static nonstd::expected<Hash::Digest, Failure>
+static tl::expected<Hash::Digest, Failure>
get_result_key_from_cpp(Context& ctx, Args& args, Hash& hash)
{
ctx.time_of_compilation = util::TimePoint::now();
args.pop_back(args.size() - orig_args_size);
if (!result) {
- return nonstd::make_unexpected(result.error());
+ return tl::unexpected(result.error());
} else if (result->exit_status != 0) {
LOG("Preprocessor gave exit status {}", result->exit_status);
- return nonstd::make_unexpected(Statistic::preprocessor_error);
+ return tl::unexpected(Statistic::preprocessor_error);
}
cpp_stderr_data = result->stderr_data;
// Hash mtime or content of a file, or the output of a command, according to
// the CCACHE_COMPILERCHECK setting.
-static nonstd::expected<void, Failure>
+static tl::expected<void, Failure>
hash_compiler(const Context& ctx,
Hash& hash,
const Stat& st,
hash, ctx.config.compiler_check(), ctx.orig_args[0])) {
LOG("Failure running compiler check command: {}",
ctx.config.compiler_check());
- return nonstd::make_unexpected(Statistic::compiler_check_failed);
+ return tl::unexpected(Statistic::compiler_check_failed);
}
}
return {};
// If `ccbin_st` and `ccbin` are set, they refer to a directory or compiler set
// with -ccbin/--compiler-bindir. If `ccbin_st` is nullptr or `ccbin` is the
// empty string, the compilers are looked up in PATH instead.
-static nonstd::expected<void, Failure>
+static tl::expected<void, Failure>
hash_nvcc_host_compiler(const Context& ctx,
Hash& hash,
const Stat* ccbin_st = nullptr,
}
// update a hash with information common for the direct and preprocessor modes.
-static nonstd::expected<void, Failure>
+static tl::expected<void, Failure>
hash_common_info(const Context& ctx,
const Args& args,
Hash& hash,
auto st = Stat::stat(compiler_path, Stat::OnError::log);
if (!st) {
- return nonstd::make_unexpected(Statistic::could_not_find_compiler);
+ return tl::unexpected(Statistic::could_not_find_compiler);
}
// Hash information about the compiler.
LOG("Hashing sanitize blacklist {}", sanitize_blacklist);
hash.hash_delimiter("sanitizeblacklist");
if (!hash_binary_file(ctx, hash, sanitize_blacklist)) {
- return nonstd::make_unexpected(Statistic::error_hashing_extra_file);
+ return tl::unexpected(Statistic::error_hashing_extra_file);
}
}
LOG("Hashing extra file {}", path);
hash.hash_delimiter("extrafile");
if (!hash_binary_file(ctx, hash, path)) {
- return nonstd::make_unexpected(Statistic::error_hashing_extra_file);
+ return tl::unexpected(Statistic::error_hashing_extra_file);
}
}
}
}
}
-static nonstd::expected<void, Failure>
+static tl::expected<void, Failure>
hash_argument(const Context& ctx,
const Args& args,
size_t& i,
if (eq_pos == std::string::npos) {
if (i + 1 >= args.size()) {
LOG("missing argument for \"{}\"", args[i]);
- return nonstd::make_unexpected(Statistic::bad_compiler_arguments);
+ return tl::unexpected(Statistic::bad_compiler_arguments);
}
path = args[i + 1];
i++;
return {};
}
-static nonstd::expected<std::optional<Hash::Digest>, Failure>
+static tl::expected<std::optional<Hash::Digest>, Failure>
get_manifest_key(Context& ctx, Hash& hash)
{
// Hash environment variables that affect the preprocessor output.
auto ret =
hash_source_code_file(ctx, input_file_digest, ctx.args_info.input_file);
if (ret.contains(HashSourceCode::error)) {
- return nonstd::make_unexpected(Statistic::internal_error);
+ return tl::unexpected(Statistic::internal_error);
}
if (ret.contains(HashSourceCode::found_time)) {
LOG_RAW("Disabling direct mode");
return found;
}
-static nonstd::expected<void, Failure>
+static tl::expected<void, Failure>
hash_profiling_related_data(const Context& ctx, Hash& hash)
{
// For profile generation (-fprofile(-instr)-generate[=path])
if (ctx.args_info.profile_use && !hash_profile_data_file(ctx, hash)) {
LOG_RAW("No profile data file found");
- return nonstd::make_unexpected(Statistic::no_input_file);
+ return tl::unexpected(Statistic::no_input_file);
}
return {};
// Update a hash sum with information specific to the direct and preprocessor
// modes and calculate the result key. Returns the result key on success, and
// if direct_mode is true also the manifest key.
-static nonstd::expected<
+static tl::expected<
std::pair<std::optional<Hash::Digest>, std::optional<Hash::Digest>>,
Failure>
calculate_result_and_manifest_key(Context& ctx,
if (direct_mode) {
const auto manifest_key_result = get_manifest_key(ctx, hash);
if (!manifest_key_result) {
- return nonstd::make_unexpected(manifest_key_result.error());
+ return tl::unexpected(manifest_key_result.error());
}
manifest_key = *manifest_key_result;
if (manifest_key) {
} else if (ctx.args_info.arch_args.empty()) {
const auto digest = get_result_key_from_cpp(ctx, *preprocessor_args, hash);
if (!digest) {
- return nonstd::make_unexpected(digest.error());
+ return tl::unexpected(digest.error());
}
result_key = *digest;
LOG_RAW("Got result key from preprocessor");
const auto digest =
get_result_key_from_cpp(ctx, *preprocessor_args, hash);
if (!digest) {
- return nonstd::make_unexpected(digest.error());
+ return tl::unexpected(digest.error());
}
result_key = *digest;
LOG("Got result key from preprocessor with -arch {}", arch);
enum class FromCacheCallMode { direct, cpp };
// Try to return the compile result from cache.
-static nonstd::expected<bool, Failure>
+static tl::expected<bool, Failure>
from_cache(Context& ctx, FromCacheCallMode mode, const Hash::Digest& result_key)
{
// The user might be disabling cache hits.
LOG("Write error when retrieving result from {}: {}",
util::format_digest(result_key),
e.what());
- return nonstd::make_unexpected(Statistic::bad_output_file);
+ return tl::unexpected(Statistic::bad_output_file);
} catch (core::Error& e) {
LOG("Failed to get result from {}: {}",
util::format_digest(result_key),
// Make a copy of stderr that will not be cached, so things like distcc can
// send networking errors to it.
-static nonstd::expected<void, Failure>
+static tl::expected<void, Failure>
set_up_uncached_err()
{
int uncached_fd =
dup(STDERR_FILENO); // The file descriptor is intentionally leaked.
if (uncached_fd == -1) {
LOG("dup(2) failed: {}", strerror(errno));
- return nonstd::make_unexpected(Statistic::internal_error);
+ return tl::unexpected(Statistic::internal_error);
}
util::setenv("UNCACHED_ERR_FD", FMT("{}", uncached_fd));
static int cache_compilation(int argc, const char* const* argv);
-static nonstd::expected<core::StatisticsCounters, Failure>
+static tl::expected<core::StatisticsCounters, Failure>
do_cache_compilation(Context& ctx);
static void
return EXIT_SUCCESS;
}
-static nonstd::expected<core::StatisticsCounters, Failure>
+static tl::expected<core::StatisticsCounters, Failure>
do_cache_compilation(Context& ctx)
{
if (ctx.config.disable()) {
LOG_RAW("ccache is disabled");
- return nonstd::make_unexpected(Statistic::none);
+ return tl::unexpected(Statistic::none);
}
if (ctx.actual_cwd.empty()) {
LOG("Unable to determine current working directory: {}", strerror(errno));
- return nonstd::make_unexpected(Statistic::internal_error);
+ return tl::unexpected(Statistic::internal_error);
}
// Set CCACHE_DISABLE so no process ccache executes from now on will risk
MTR_END("main", "process_args");
if (processed.error) {
- return nonstd::make_unexpected(*processed.error);
+ return tl::unexpected(*processed.error);
}
TRY(set_up_uncached_err());
LOG("{} found in {}, disabling ccache",
k_ccache_disable_token,
ctx.args_info.input_file);
- return nonstd::make_unexpected(Statistic::disabled);
+ return tl::unexpected(Statistic::disabled);
}
{
ctx, args_to_hash, direct_hash, nullptr);
MTR_END("hash", "direct_hash");
if (!result_and_manifest_key) {
- return nonstd::make_unexpected(result_and_manifest_key.error());
+ return tl::unexpected(result_and_manifest_key.error());
}
std::tie(result_key, manifest_key) = *result_and_manifest_key;
if (result_key) {
const auto from_cache_result =
from_cache(ctx, FromCacheCallMode::direct, *result_key);
if (!from_cache_result) {
- return nonstd::make_unexpected(from_cache_result.error());
+ return tl::unexpected(from_cache_result.error());
} else if (*from_cache_result) {
return Statistic::direct_cache_hit;
}
if (ctx.config.read_only_direct()) {
LOG_RAW("Read-only direct mode; running real compiler");
- return nonstd::make_unexpected(Statistic::cache_miss);
+ return tl::unexpected(Statistic::cache_miss);
}
if (!ctx.config.depend_mode()) {
ctx, args_to_hash, cpp_hash, &processed.preprocessor_args);
MTR_END("hash", "cpp_hash");
if (!result_and_manifest_key) {
- return nonstd::make_unexpected(result_and_manifest_key.error());
+ return tl::unexpected(result_and_manifest_key.error());
}
result_key = result_and_manifest_key->first;
const auto from_cache_result =
from_cache(ctx, FromCacheCallMode::cpp, *result_key);
if (!from_cache_result) {
- return nonstd::make_unexpected(from_cache_result.error());
+ return tl::unexpected(from_cache_result.error());
} else if (*from_cache_result) {
if (ctx.config.direct_mode() && manifest_key && put_result_in_manifest) {
MTR_SCOPE("cache", "update_manifest");
if (ctx.config.read_only()) {
LOG_RAW("Read-only mode; running real compiler");
- return nonstd::make_unexpected(Statistic::cache_miss);
+ return tl::unexpected(Statistic::cache_miss);
}
add_prefix(ctx, processed.compiler_args, ctx.config.prefix_command());
depend_mode_hash);
MTR_END("cache", "to_cache");
if (!digest) {
- return nonstd::make_unexpected(digest.error());
+ return tl::unexpected(digest.error());
}
result_key = *digest;
if (ctx.config.direct_mode()) {
PRINT(stdout, "({}) {} = {}\n", origin, key, value);
}
-static nonstd::expected<std::vector<uint8_t>, std::string>
+static tl::expected<std::vector<uint8_t>, std::string>
read_from_path_or_stdin(const std::string& path)
{
if (path == "-") {
output.insert(output.end(), data.begin(), data.end());
});
if (!result) {
- return nonstd::make_unexpected(
+ return tl::unexpected(
FMT("Failed to read from stdin: {}", result.error()));
}
return output;
} else {
const auto result = util::read_file<std::vector<uint8_t>>(path);
if (!result) {
- return nonstd::make_unexpected(
- FMT("Failed to read {}: {}", path, result.error()));
+ return tl::unexpected(FMT("Failed to read {}: {}", path, result.error()));
}
return *result;
}
public:
FileStorageBackend(const Params& params);
- nonstd::expected<std::optional<util::Bytes>, Failure>
+ tl::expected<std::optional<util::Bytes>, Failure>
get(const Hash::Digest& key) override;
- nonstd::expected<bool, Failure> put(const Hash::Digest& key,
- nonstd::span<const uint8_t> value,
- bool only_if_missing) override;
+ tl::expected<bool, Failure> put(const Hash::Digest& key,
+ nonstd::span<const uint8_t> value,
+ bool only_if_missing) override;
- nonstd::expected<bool, Failure> remove(const Hash::Digest& key) override;
+ tl::expected<bool, Failure> remove(const Hash::Digest& key) override;
private:
enum class Layout { flat, subdirs };
}
}
-nonstd::expected<std::optional<util::Bytes>, RemoteStorage::Backend::Failure>
+tl::expected<std::optional<util::Bytes>, RemoteStorage::Backend::Failure>
FileStorageBackend::get(const Hash::Digest& key)
{
const auto path = get_entry_path(key);
auto value = util::read_file<util::Bytes>(path);
if (!value) {
LOG("Failed to read {}: {}", path, value.error());
- return nonstd::make_unexpected(Failure::error);
+ return tl::unexpected(Failure::error);
}
return std::move(*value);
}
-nonstd::expected<bool, RemoteStorage::Backend::Failure>
+tl::expected<bool, RemoteStorage::Backend::Failure>
FileStorageBackend::put(const Hash::Digest& key,
const nonstd::span<const uint8_t> value,
const bool only_if_missing)
const auto dir = Util::dir_name(path);
if (auto result = fs::create_directories(dir); !result) {
LOG("Failed to create directory {}: {}", dir, result.error().message());
- return nonstd::make_unexpected(Failure::error);
+ return tl::unexpected(Failure::error);
}
util::create_cachedir_tag(m_dir);
return true;
} catch (const core::Error& e) {
LOG("Failed to write {}: {}", path, e.what());
- return nonstd::make_unexpected(Failure::error);
+ return tl::unexpected(Failure::error);
}
}
}
-nonstd::expected<bool, RemoteStorage::Backend::Failure>
+tl::expected<bool, RemoteStorage::Backend::Failure>
FileStorageBackend::remove(const Hash::Digest& key)
{
auto entry_path = get_entry_path(key);
auto result = util::remove_nfs_safe(entry_path);
if (!result) {
LOG("Failed to remove {}: {}", entry_path, result.error().message());
- return nonstd::make_unexpected(RemoteStorage::Backend::Failure::error);
+ return tl::unexpected(RemoteStorage::Backend::Failure::error);
}
return *result;
}
public:
HttpStorageBackend(const Params& params);
- nonstd::expected<std::optional<util::Bytes>, Failure>
+ tl::expected<std::optional<util::Bytes>, Failure>
get(const Hash::Digest& key) override;
- nonstd::expected<bool, Failure> put(const Hash::Digest& key,
- nonstd::span<const uint8_t> value,
- bool only_if_missing) override;
+ tl::expected<bool, Failure> put(const Hash::Digest& key,
+ nonstd::span<const uint8_t> value,
+ bool only_if_missing) override;
- nonstd::expected<bool, Failure> remove(const Hash::Digest& key) override;
+ tl::expected<bool, Failure> remove(const Hash::Digest& key) override;
private:
enum class Layout { bazel, flat, subdirs };
m_http_client.set_write_timeout(operation_timeout);
}
-nonstd::expected<std::optional<util::Bytes>, RemoteStorage::Backend::Failure>
+tl::expected<std::optional<util::Bytes>, RemoteStorage::Backend::Failure>
HttpStorageBackend::get(const Hash::Digest& key)
{
const auto url_path = get_entry_path(key);
url_path,
to_string(result.error()),
static_cast<int>(result.error()));
- return nonstd::make_unexpected(failure_from_httplib_error(result.error()));
+ return tl::unexpected(failure_from_httplib_error(result.error()));
}
if (result->status < 200 || result->status >= 300) {
return util::Bytes(result->body.data(), result->body.size());
}
-nonstd::expected<bool, RemoteStorage::Backend::Failure>
+tl::expected<bool, RemoteStorage::Backend::Failure>
HttpStorageBackend::put(const Hash::Digest& key,
const nonstd::span<const uint8_t> value,
const bool only_if_missing)
url_path,
to_string(result.error()),
static_cast<int>(result.error()));
- return nonstd::make_unexpected(
- failure_from_httplib_error(result.error()));
+ return tl::unexpected(failure_from_httplib_error(result.error()));
}
if (result->status >= 200 && result->status < 300) {
url_path,
to_string(result.error()),
static_cast<int>(result.error()));
- return nonstd::make_unexpected(failure_from_httplib_error(result.error()));
+ return tl::unexpected(failure_from_httplib_error(result.error()));
}
if (result->status < 200 || result->status >= 300) {
LOG("Failed to put {} to http storage: status code: {}",
url_path,
result->status);
- return nonstd::make_unexpected(failure_from_httplib_error(result.error()));
+ return tl::unexpected(failure_from_httplib_error(result.error()));
}
return true;
}
-nonstd::expected<bool, RemoteStorage::Backend::Failure>
+tl::expected<bool, RemoteStorage::Backend::Failure>
HttpStorageBackend::remove(const Hash::Digest& key)
{
const auto url_path = get_entry_path(key);
url_path,
to_string(result.error()),
static_cast<int>(result.error()));
- return nonstd::make_unexpected(failure_from_httplib_error(result.error()));
+ return tl::unexpected(failure_from_httplib_error(result.error()));
}
if (result->status < 200 || result->status >= 300) {
LOG("Failed to delete {} from http storage: status code: {}",
url_path,
result->status);
- return nonstd::make_unexpected(failure_from_httplib_error(result.error()));
+ return tl::unexpected(failure_from_httplib_error(result.error()));
}
return true;
public:
RedisStorageBackend(const RemoteStorage::Backend::Params& params);
- nonstd::expected<std::optional<util::Bytes>, Failure>
+ tl::expected<std::optional<util::Bytes>, Failure>
get(const Hash::Digest& key) override;
- nonstd::expected<bool, Failure> put(const Hash::Digest& key,
- nonstd::span<const uint8_t> value,
- bool only_if_missing) override;
+ tl::expected<bool, Failure> put(const Hash::Digest& key,
+ nonstd::span<const uint8_t> value,
+ bool only_if_missing) override;
- nonstd::expected<bool, Failure> remove(const Hash::Digest& key) override;
+ tl::expected<bool, Failure> remove(const Hash::Digest& key) override;
private:
const std::string m_prefix;
connect(const Url& url, uint32_t connect_timeout, uint32_t operation_timeout);
void select_database(const Url& url);
void authenticate(const Url& url);
- nonstd::expected<RedisReply, Failure> redis_command(const char* format, ...);
+ tl::expected<RedisReply, Failure> redis_command(const char* format, ...);
std::string get_key_string(const Hash::Digest& digest) const;
};
#endif
}
-nonstd::expected<std::optional<util::Bytes>, RemoteStorage::Backend::Failure>
+tl::expected<std::optional<util::Bytes>, RemoteStorage::Backend::Failure>
RedisStorageBackend::get(const Hash::Digest& key)
{
const auto key_string = get_key_string(key);
LOG("Redis GET {}", key_string);
const auto reply = redis_command("GET %s", key_string.c_str());
if (!reply) {
- return nonstd::make_unexpected(reply.error());
+ return tl::unexpected(reply.error());
} else if ((*reply)->type == REDIS_REPLY_STRING) {
return util::Bytes((*reply)->str, (*reply)->len);
} else if ((*reply)->type == REDIS_REPLY_NIL) {
return std::nullopt;
} else {
LOG("Unknown reply type: {}", (*reply)->type);
- return nonstd::make_unexpected(Failure::error);
+ return tl::unexpected(Failure::error);
}
}
-nonstd::expected<bool, RemoteStorage::Backend::Failure>
+tl::expected<bool, RemoteStorage::Backend::Failure>
RedisStorageBackend::put(const Hash::Digest& key,
nonstd::span<const uint8_t> value,
bool only_if_missing)
LOG("Redis EXISTS {}", key_string);
const auto reply = redis_command("EXISTS %s", key_string.c_str());
if (!reply) {
- return nonstd::make_unexpected(reply.error());
+ return tl::unexpected(reply.error());
} else if ((*reply)->type != REDIS_REPLY_INTEGER) {
LOG("Unknown reply type: {}", (*reply)->type);
} else if ((*reply)->integer > 0) {
const auto reply =
redis_command("SET %s %b", key_string.c_str(), value.data(), value.size());
if (!reply) {
- return nonstd::make_unexpected(reply.error());
+ return tl::unexpected(reply.error());
} else if ((*reply)->type == REDIS_REPLY_STATUS) {
return true;
} else {
LOG("Unknown reply type: {}", (*reply)->type);
- return nonstd::make_unexpected(Failure::error);
+ return tl::unexpected(Failure::error);
}
}
-nonstd::expected<bool, RemoteStorage::Backend::Failure>
+tl::expected<bool, RemoteStorage::Backend::Failure>
RedisStorageBackend::remove(const Hash::Digest& key)
{
const auto key_string = get_key_string(key);
LOG("Redis DEL {}", key_string);
const auto reply = redis_command("DEL %s", key_string.c_str());
if (!reply) {
- return nonstd::make_unexpected(reply.error());
+ return tl::unexpected(reply.error());
} else if ((*reply)->type == REDIS_REPLY_INTEGER) {
return (*reply)->integer > 0;
} else {
LOG("Unknown reply type: {}", (*reply)->type);
- return nonstd::make_unexpected(Failure::error);
+ return tl::unexpected(Failure::error);
}
}
}
}
-nonstd::expected<RedisReply, RemoteStorage::Backend::Failure>
+tl::expected<RedisReply, RemoteStorage::Backend::Failure>
RedisStorageBackend::redis_command(const char* format, ...)
{
va_list ap;
va_end(ap);
if (!reply) {
LOG("Redis command failed: {}", m_context->errstr);
- return nonstd::make_unexpected(is_timeout(m_context->err) ? Failure::timeout
- : Failure::error);
+ return tl::unexpected(is_timeout(m_context->err) ? Failure::timeout
+ : Failure::error);
} else if (reply->type == REDIS_REPLY_ERROR) {
LOG("Redis command failed: {}", reply->str);
- return nonstd::make_unexpected(Failure::error);
+ return tl::unexpected(Failure::error);
} else {
return RedisReply(reply, freeReplyObject);
}
#include <storage/types.hpp>
#include <util/Bytes.hpp>
-#include <third_party/nonstd/expected.hpp>
#include <third_party/nonstd/span.hpp>
+#include <third_party/tl/expected.hpp>
#include <third_party/url.hpp>
#include <chrono>
// Get the value associated with `key`. Returns the value on success or
// std::nullopt if the entry is not present.
- virtual nonstd::expected<std::optional<util::Bytes>, Failure>
+ virtual tl::expected<std::optional<util::Bytes>, Failure>
get(const Hash::Digest& key) = 0;
// Put `value` associated to `key` in the storage. A true `only_if_missing`
// is a hint that the value does not have to be set if already present.
// Returns true if the entry was stored, otherwise false.
- virtual nonstd::expected<bool, Failure>
- put(const Hash::Digest& key,
- nonstd::span<const uint8_t> value,
- bool only_if_missing = false) = 0;
+ virtual tl::expected<bool, Failure> put(const Hash::Digest& key,
+ nonstd::span<const uint8_t> value,
+ bool only_if_missing = false) = 0;
// Remove `key` and its associated value. Returns true if the entry was
// removed, otherwise false.
- virtual nonstd::expected<bool, Failure> remove(const Hash::Digest& key) = 0;
+ virtual tl::expected<bool, Failure> remove(const Hash::Digest& key) = 0;
// Determine whether an attribute is handled by the remote storage
// framework itself.
+++ /dev/null
-// This version targets C++11 and later.
-//
-// Copyright (C) 2016-2020 Martin Moene.
-//
-// Distributed under the Boost Software License, Version 1.0.
-// (See accompanying file LICENSE.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
-//
-// expected lite is based on:
-// A proposal to add a utility class to represent expected monad
-// by Vicente J. Botet Escriba and Pierre Talbot. http:://wg21.link/p0323
-
-#ifndef NONSTD_EXPECTED_LITE_HPP
-#define NONSTD_EXPECTED_LITE_HPP
-
-#define expected_lite_MAJOR 0
-#define expected_lite_MINOR 6
-#define expected_lite_PATCH 2
-
-#define expected_lite_VERSION expected_STRINGIFY(expected_lite_MAJOR) "." expected_STRINGIFY(expected_lite_MINOR) "." expected_STRINGIFY(expected_lite_PATCH)
-
-#define expected_STRINGIFY( x ) expected_STRINGIFY_( x )
-#define expected_STRINGIFY_( x ) #x
-
-// expected-lite configuration:
-
-#define nsel_EXPECTED_DEFAULT 0
-#define nsel_EXPECTED_NONSTD 1
-#define nsel_EXPECTED_STD 2
-
-// tweak header support:
-
-#ifdef __has_include
-# if __has_include(<nonstd/expected.tweak.hpp>)
-# include <nonstd/expected.tweak.hpp>
-# endif
-#define expected_HAVE_TWEAK_HEADER 1
-#else
-#define expected_HAVE_TWEAK_HEADER 0
-//# pragma message("expected.hpp: Note: Tweak header not supported.")
-#endif
-
-// expected selection and configuration:
-
-#if !defined( nsel_CONFIG_SELECT_EXPECTED )
-# define nsel_CONFIG_SELECT_EXPECTED ( nsel_HAVE_STD_EXPECTED ? nsel_EXPECTED_STD : nsel_EXPECTED_NONSTD )
-#endif
-
-// Proposal revisions:
-//
-// DXXXXR0: --
-// N4015 : -2 (2014-05-26)
-// N4109 : -1 (2014-06-29)
-// P0323R0: 0 (2016-05-28)
-// P0323R1: 1 (2016-10-12)
-// -------:
-// P0323R2: 2 (2017-06-15)
-// P0323R3: 3 (2017-10-15)
-// P0323R4: 4 (2017-11-26)
-// P0323R5: 5 (2018-02-08)
-// P0323R6: 6 (2018-04-02)
-// P0323R7: 7 (2018-06-22) *
-//
-// expected-lite uses 2 and higher
-
-#ifndef nsel_P0323R
-# define nsel_P0323R 7
-#endif
-
-// Control presence of C++ exception handling (try and auto discover):
-
-#ifndef nsel_CONFIG_NO_EXCEPTIONS
-# if defined(_MSC_VER)
-# include <cstddef> // for _HAS_EXCEPTIONS
-# endif
-# if defined(__cpp_exceptions) || defined(__EXCEPTIONS) || (_HAS_EXCEPTIONS)
-# define nsel_CONFIG_NO_EXCEPTIONS 0
-# else
-# define nsel_CONFIG_NO_EXCEPTIONS 1
-# endif
-#endif
-
-// at default use SEH with MSVC for no C++ exceptions
-
-#ifndef nsel_CONFIG_NO_EXCEPTIONS_SEH
-# define nsel_CONFIG_NO_EXCEPTIONS_SEH ( nsel_CONFIG_NO_EXCEPTIONS && _MSC_VER )
-#endif
-
-// C++ language version detection (C++23 is speculative):
-// Note: VC14.0/1900 (VS2015) lacks too much from C++14.
-
-#ifndef nsel_CPLUSPLUS
-# if defined(_MSVC_LANG ) && !defined(__clang__)
-# define nsel_CPLUSPLUS (_MSC_VER == 1900 ? 201103L : _MSVC_LANG )
-# else
-# define nsel_CPLUSPLUS __cplusplus
-# endif
-#endif
-
-#define nsel_CPP98_OR_GREATER ( nsel_CPLUSPLUS >= 199711L )
-#define nsel_CPP11_OR_GREATER ( nsel_CPLUSPLUS >= 201103L )
-#define nsel_CPP14_OR_GREATER ( nsel_CPLUSPLUS >= 201402L )
-#define nsel_CPP17_OR_GREATER ( nsel_CPLUSPLUS >= 201703L )
-#define nsel_CPP20_OR_GREATER ( nsel_CPLUSPLUS >= 202002L )
-#define nsel_CPP23_OR_GREATER ( nsel_CPLUSPLUS >= 202300L )
-
-// Use C++23 std::expected if available and requested:
-
-#if nsel_CPP23_OR_GREATER && defined(__has_include )
-# if __has_include( <expected> )
-# define nsel_HAVE_STD_EXPECTED 1
-# else
-# define nsel_HAVE_STD_EXPECTED 0
-# endif
-#else
-# define nsel_HAVE_STD_EXPECTED 0
-#endif
-
-#define nsel_USES_STD_EXPECTED ( (nsel_CONFIG_SELECT_EXPECTED == nsel_EXPECTED_STD) || ((nsel_CONFIG_SELECT_EXPECTED == nsel_EXPECTED_DEFAULT) && nsel_HAVE_STD_EXPECTED) )
-
-//
-// in_place: code duplicated in any-lite, expected-lite, expected-lite, value-ptr-lite, variant-lite:
-//
-
-#ifndef nonstd_lite_HAVE_IN_PLACE_TYPES
-#define nonstd_lite_HAVE_IN_PLACE_TYPES 1
-
-// C++17 std::in_place in <utility>:
-
-#if nsel_CPP17_OR_GREATER
-
-#include <utility>
-
-namespace nonstd {
-
-using std::in_place;
-using std::in_place_type;
-using std::in_place_index;
-using std::in_place_t;
-using std::in_place_type_t;
-using std::in_place_index_t;
-
-#define nonstd_lite_in_place_t( T) std::in_place_t
-#define nonstd_lite_in_place_type_t( T) std::in_place_type_t<T>
-#define nonstd_lite_in_place_index_t(K) std::in_place_index_t<K>
-
-#define nonstd_lite_in_place( T) std::in_place_t{}
-#define nonstd_lite_in_place_type( T) std::in_place_type_t<T>{}
-#define nonstd_lite_in_place_index(K) std::in_place_index_t<K>{}
-
-} // namespace nonstd
-
-#else // nsel_CPP17_OR_GREATER
-
-#include <cstddef>
-
-namespace nonstd {
-namespace detail {
-
-template< class T >
-struct in_place_type_tag {};
-
-template< std::size_t K >
-struct in_place_index_tag {};
-
-} // namespace detail
-
-struct in_place_t {};
-
-template< class T >
-inline in_place_t in_place( detail::in_place_type_tag<T> = detail::in_place_type_tag<T>() )
-{
- return in_place_t();
-}
-
-template< std::size_t K >
-inline in_place_t in_place( detail::in_place_index_tag<K> = detail::in_place_index_tag<K>() )
-{
- return in_place_t();
-}
-
-template< class T >
-inline in_place_t in_place_type( detail::in_place_type_tag<T> = detail::in_place_type_tag<T>() )
-{
- return in_place_t();
-}
-
-template< std::size_t K >
-inline in_place_t in_place_index( detail::in_place_index_tag<K> = detail::in_place_index_tag<K>() )
-{
- return in_place_t();
-}
-
-// mimic templated typedef:
-
-#define nonstd_lite_in_place_t( T) nonstd::in_place_t(&)( nonstd::detail::in_place_type_tag<T> )
-#define nonstd_lite_in_place_type_t( T) nonstd::in_place_t(&)( nonstd::detail::in_place_type_tag<T> )
-#define nonstd_lite_in_place_index_t(K) nonstd::in_place_t(&)( nonstd::detail::in_place_index_tag<K> )
-
-#define nonstd_lite_in_place( T) nonstd::in_place_type<T>
-#define nonstd_lite_in_place_type( T) nonstd::in_place_type<T>
-#define nonstd_lite_in_place_index(K) nonstd::in_place_index<K>
-
-} // namespace nonstd
-
-#endif // nsel_CPP17_OR_GREATER
-#endif // nonstd_lite_HAVE_IN_PLACE_TYPES
-
-//
-// Using std::expected:
-//
-
-#if nsel_USES_STD_EXPECTED
-
-#include <expected>
-
-namespace nonstd {
-
- using std::expected;
-// ...
-}
-
-#else // nsel_USES_STD_EXPECTED
-
-#include <cassert>
-#include <exception>
-#include <functional>
-#include <initializer_list>
-#include <memory>
-#include <new>
-#include <system_error>
-#include <type_traits>
-#include <utility>
-
-// additional includes:
-
-#if nsel_CONFIG_NO_EXCEPTIONS
-# if nsel_CONFIG_NO_EXCEPTIONS_SEH
-# include <windows.h> // for ExceptionCodes
-# else
-// already included: <cassert>
-# endif
-#else
-# include <stdexcept>
-#endif
-
-// C++ feature usage:
-
-#if nsel_CPP11_OR_GREATER
-# define nsel_constexpr constexpr
-#else
-# define nsel_constexpr /*constexpr*/
-#endif
-
-#if nsel_CPP14_OR_GREATER
-# define nsel_constexpr14 constexpr
-#else
-# define nsel_constexpr14 /*constexpr*/
-#endif
-
-#if nsel_CPP17_OR_GREATER
-# define nsel_inline17 inline
-#else
-# define nsel_inline17 /*inline*/
-#endif
-
-// Compiler versions:
-//
-// MSVC++ 6.0 _MSC_VER == 1200 nsel_COMPILER_MSVC_VERSION == 60 (Visual Studio 6.0)
-// MSVC++ 7.0 _MSC_VER == 1300 nsel_COMPILER_MSVC_VERSION == 70 (Visual Studio .NET 2002)
-// MSVC++ 7.1 _MSC_VER == 1310 nsel_COMPILER_MSVC_VERSION == 71 (Visual Studio .NET 2003)
-// MSVC++ 8.0 _MSC_VER == 1400 nsel_COMPILER_MSVC_VERSION == 80 (Visual Studio 2005)
-// MSVC++ 9.0 _MSC_VER == 1500 nsel_COMPILER_MSVC_VERSION == 90 (Visual Studio 2008)
-// MSVC++ 10.0 _MSC_VER == 1600 nsel_COMPILER_MSVC_VERSION == 100 (Visual Studio 2010)
-// MSVC++ 11.0 _MSC_VER == 1700 nsel_COMPILER_MSVC_VERSION == 110 (Visual Studio 2012)
-// MSVC++ 12.0 _MSC_VER == 1800 nsel_COMPILER_MSVC_VERSION == 120 (Visual Studio 2013)
-// MSVC++ 14.0 _MSC_VER == 1900 nsel_COMPILER_MSVC_VERSION == 140 (Visual Studio 2015)
-// MSVC++ 14.1 _MSC_VER >= 1910 nsel_COMPILER_MSVC_VERSION == 141 (Visual Studio 2017)
-// MSVC++ 14.2 _MSC_VER >= 1920 nsel_COMPILER_MSVC_VERSION == 142 (Visual Studio 2019)
-
-#if defined(_MSC_VER) && !defined(__clang__)
-# define nsel_COMPILER_MSVC_VER (_MSC_VER )
-# define nsel_COMPILER_MSVC_VERSION (_MSC_VER / 10 - 10 * ( 5 + (_MSC_VER < 1900)) )
-#else
-# define nsel_COMPILER_MSVC_VER 0
-# define nsel_COMPILER_MSVC_VERSION 0
-#endif
-
-#define nsel_COMPILER_VERSION( major, minor, patch ) ( 10 * ( 10 * (major) + (minor) ) + (patch) )
-
-#if defined(__clang__)
-# define nsel_COMPILER_CLANG_VERSION nsel_COMPILER_VERSION(__clang_major__, __clang_minor__, __clang_patchlevel__)
-#else
-# define nsel_COMPILER_CLANG_VERSION 0
-#endif
-
-#if defined(__GNUC__) && !defined(__clang__)
-# define nsel_COMPILER_GNUC_VERSION nsel_COMPILER_VERSION(__GNUC__, __GNUC_MINOR__, __GNUC_PATCHLEVEL__)
-#else
-# define nsel_COMPILER_GNUC_VERSION 0
-#endif
-
-// half-open range [lo..hi):
-//#define nsel_BETWEEN( v, lo, hi ) ( (lo) <= (v) && (v) < (hi) )
-
-// Method enabling
-
-#define nsel_REQUIRES_0(...) \
- template< bool B = (__VA_ARGS__), typename std::enable_if<B, int>::type = 0 >
-
-#define nsel_REQUIRES_T(...) \
- , typename std::enable_if< (__VA_ARGS__), int >::type = 0
-
-#define nsel_REQUIRES_R(R, ...) \
- typename std::enable_if< (__VA_ARGS__), R>::type
-
-#define nsel_REQUIRES_A(...) \
- , typename std::enable_if< (__VA_ARGS__), void*>::type = nullptr
-
-// Presence of language and library features:
-
-#ifdef _HAS_CPP0X
-# define nsel_HAS_CPP0X _HAS_CPP0X
-#else
-# define nsel_HAS_CPP0X 0
-#endif
-
-//#define nsel_CPP11_140 (nsel_CPP11_OR_GREATER || nsel_COMPILER_MSVC_VER >= 1900)
-
-// Clang, GNUC, MSVC warning suppression macros:
-
-#ifdef __clang__
-# pragma clang diagnostic push
-#elif defined __GNUC__
-# pragma GCC diagnostic push
-#endif // __clang__
-
-#if nsel_COMPILER_MSVC_VERSION >= 140
-# pragma warning( push )
-# define nsel_DISABLE_MSVC_WARNINGS(codes) __pragma( warning(disable: codes) )
-#else
-# define nsel_DISABLE_MSVC_WARNINGS(codes)
-#endif
-
-#ifdef __clang__
-# define nsel_RESTORE_WARNINGS() _Pragma("clang diagnostic pop")
-#elif defined __GNUC__
-# define nsel_RESTORE_WARNINGS() _Pragma("GCC diagnostic pop")
-#elif nsel_COMPILER_MSVC_VERSION >= 140
-# define nsel_RESTORE_WARNINGS() __pragma( warning( pop ) )
-#else
-# define nsel_RESTORE_WARNINGS()
-#endif
-
-// Suppress the following MSVC (GSL) warnings:
-// - C26409: Avoid calling new and delete explicitly, use std::make_unique<T> instead (r.11)
-
-nsel_DISABLE_MSVC_WARNINGS( 26409 )
-
-//
-// expected:
-//
-
-namespace nonstd { namespace expected_lite {
-
-// type traits C++17:
-
-namespace std17 {
-
-#if nsel_CPP17_OR_GREATER
-
-using std::conjunction;
-using std::is_swappable;
-using std::is_nothrow_swappable;
-
-#else // nsel_CPP17_OR_GREATER
-
-namespace detail {
-
-using std::swap;
-
-struct is_swappable
-{
- template< typename T, typename = decltype( swap( std::declval<T&>(), std::declval<T&>() ) ) >
- static std::true_type test( int /* unused */);
-
- template< typename >
- static std::false_type test(...);
-};
-
-struct is_nothrow_swappable
-{
- // wrap noexcept(expr) in separate function as work-around for VC140 (VS2015):
-
- template< typename T >
- static constexpr bool satisfies()
- {
- return noexcept( swap( std::declval<T&>(), std::declval<T&>() ) );
- }
-
- template< typename T >
- static auto test( int ) -> std::integral_constant<bool, satisfies<T>()>{}
-
- template< typename >
- static auto test(...) -> std::false_type;
-};
-} // namespace detail
-
-// is [nothow] swappable:
-
-template< typename T >
-struct is_swappable : decltype( detail::is_swappable::test<T>(0) ){};
-
-template< typename T >
-struct is_nothrow_swappable : decltype( detail::is_nothrow_swappable::test<T>(0) ){};
-
-// conjunction:
-
-template< typename... > struct conjunction : std::true_type{};
-template< typename B1 > struct conjunction<B1> : B1{};
-
-template< typename B1, typename... Bn >
-struct conjunction<B1, Bn...> : std::conditional<bool(B1::value), conjunction<Bn...>, B1>::type{};
-
-#endif // nsel_CPP17_OR_GREATER
-
-} // namespace std17
-
-// type traits C++20:
-
-namespace std20 {
-
-#if defined(__cpp_lib_remove_cvref)
-
-using std::remove_cvref;
-
-#else
-
-template< typename T >
-struct remove_cvref
-{
- typedef typename std::remove_cv< typename std::remove_reference<T>::type >::type type;
-};
-
-#endif
-
-} // namespace std20
-
-// forward declaration:
-
-template< typename T, typename E >
-class expected;
-
-namespace detail {
-
-/// discriminated union to hold value or 'error'.
-
-template< typename T, typename E >
-class storage_t_impl
-{
- template< typename, typename > friend class nonstd::expected_lite::expected;
-
-public:
- using value_type = T;
- using error_type = E;
-
- // no-op construction
- storage_t_impl() {}
- ~storage_t_impl() {}
-
- explicit storage_t_impl( bool has_value )
- : m_has_value( has_value )
- {}
-
- void construct_value( value_type const & e )
- {
- new( &m_value ) value_type( e );
- }
-
- void construct_value( value_type && e )
- {
- new( &m_value ) value_type( std::move( e ) );
- }
-
- template< class... Args >
- void emplace_value( Args&&... args )
- {
- new( &m_value ) value_type( std::forward<Args>(args)...);
- }
-
- template< class U, class... Args >
- void emplace_value( std::initializer_list<U> il, Args&&... args )
- {
- new( &m_value ) value_type( il, std::forward<Args>(args)... );
- }
-
- void destruct_value()
- {
- m_value.~value_type();
- }
-
- void construct_error( error_type const & e )
- {
- new( &m_error ) error_type( e );
- }
-
- void construct_error( error_type && e )
- {
- new( &m_error ) error_type( std::move( e ) );
- }
-
- template< class... Args >
- void emplace_error( Args&&... args )
- {
- new( &m_error ) error_type( std::forward<Args>(args)...);
- }
-
- template< class U, class... Args >
- void emplace_error( std::initializer_list<U> il, Args&&... args )
- {
- new( &m_error ) error_type( il, std::forward<Args>(args)... );
- }
-
- void destruct_error()
- {
- m_error.~error_type();
- }
-
- constexpr value_type const & value() const &
- {
- return m_value;
- }
-
- value_type & value() &
- {
- return m_value;
- }
-
- constexpr value_type const && value() const &&
- {
- return std::move( m_value );
- }
-
- nsel_constexpr14 value_type && value() &&
- {
- return std::move( m_value );
- }
-
- value_type const * value_ptr() const
- {
- return &m_value;
- }
-
- value_type * value_ptr()
- {
- return &m_value;
- }
-
- error_type const & error() const &
- {
- return m_error;
- }
-
- error_type & error() &
- {
- return m_error;
- }
-
- constexpr error_type const && error() const &&
- {
- return std::move( m_error );
- }
-
- nsel_constexpr14 error_type && error() &&
- {
- return std::move( m_error );
- }
-
- bool has_value() const
- {
- return m_has_value;
- }
-
- void set_has_value( bool v )
- {
- m_has_value = v;
- }
-
-private:
- union
- {
- value_type m_value;
- error_type m_error;
- };
-
- bool m_has_value = false;
-};
-
-/// discriminated union to hold only 'error'.
-
-template< typename E >
-struct storage_t_impl<void, E>
-{
- template< typename, typename > friend class nonstd::expected_lite::expected;
-
-public:
- using value_type = void;
- using error_type = E;
-
- // no-op construction
- storage_t_impl() {}
- ~storage_t_impl() {}
-
- explicit storage_t_impl( bool has_value )
- : m_has_value( has_value )
- {}
-
- void construct_error( error_type const & e )
- {
- new( &m_error ) error_type( e );
- }
-
- void construct_error( error_type && e )
- {
- new( &m_error ) error_type( std::move( e ) );
- }
-
- template< class... Args >
- void emplace_error( Args&&... args )
- {
- new( &m_error ) error_type( std::forward<Args>(args)...);
- }
-
- template< class U, class... Args >
- void emplace_error( std::initializer_list<U> il, Args&&... args )
- {
- new( &m_error ) error_type( il, std::forward<Args>(args)... );
- }
-
- void destruct_error()
- {
- m_error.~error_type();
- }
-
- error_type const & error() const &
- {
- return m_error;
- }
-
- error_type & error() &
- {
- return m_error;
- }
-
- constexpr error_type const && error() const &&
- {
- return std::move( m_error );
- }
-
- nsel_constexpr14 error_type && error() &&
- {
- return std::move( m_error );
- }
-
- bool has_value() const
- {
- return m_has_value;
- }
-
- void set_has_value( bool v )
- {
- m_has_value = v;
- }
-
-private:
- union
- {
- char m_dummy;
- error_type m_error;
- };
-
- bool m_has_value = false;
-};
-
-template< typename T, typename E, bool isConstructable, bool isMoveable >
-class storage_t
-{
-public:
- storage_t() = default;
- ~storage_t() = default;
-
- explicit storage_t( bool has_value )
- : storage_t_impl<T, E>( has_value )
- {}
-
- storage_t( storage_t const & other ) = delete;
- storage_t( storage_t && other ) = delete;
-};
-
-template< typename T, typename E >
-class storage_t<T, E, true, true> : public storage_t_impl<T, E>
-{
-public:
- storage_t() = default;
- ~storage_t() = default;
-
- explicit storage_t( bool has_value )
- : storage_t_impl<T, E>( has_value )
- {}
-
- storage_t( storage_t const & other )
- : storage_t_impl<T, E>( other.has_value() )
- {
- if ( this->has_value() ) this->construct_value( other.value() );
- else this->construct_error( other.error() );
- }
-
- storage_t(storage_t && other )
- : storage_t_impl<T, E>( other.has_value() )
- {
- if ( this->has_value() ) this->construct_value( std::move( other.value() ) );
- else this->construct_error( std::move( other.error() ) );
- }
-};
-
-template< typename E >
-class storage_t<void, E, true, true> : public storage_t_impl<void, E>
-{
-public:
- storage_t() = default;
- ~storage_t() = default;
-
- explicit storage_t( bool has_value )
- : storage_t_impl<void, E>( has_value )
- {}
-
- storage_t( storage_t const & other )
- : storage_t_impl<void, E>( other.has_value() )
- {
- if ( this->has_value() ) ;
- else this->construct_error( other.error() );
- }
-
- storage_t(storage_t && other )
- : storage_t_impl<void, E>( other.has_value() )
- {
- if ( this->has_value() ) ;
- else this->construct_error( std::move( other.error() ) );
- }
-};
-
-template< typename T, typename E >
-class storage_t<T, E, true, false> : public storage_t_impl<T, E>
-{
-public:
- storage_t() = default;
- ~storage_t() = default;
-
- explicit storage_t( bool has_value )
- : storage_t_impl<T, E>( has_value )
- {}
-
- storage_t( storage_t const & other )
- : storage_t_impl<T, E>(other.has_value())
- {
- if ( this->has_value() ) this->construct_value( other.value() );
- else this->construct_error( other.error() );
- }
-
- storage_t( storage_t && other ) = delete;
-};
-
-template< typename E >
-class storage_t<void, E, true, false> : public storage_t_impl<void, E>
-{
-public:
- storage_t() = default;
- ~storage_t() = default;
-
- explicit storage_t( bool has_value )
- : storage_t_impl<void, E>( has_value )
- {}
-
- storage_t( storage_t const & other )
- : storage_t_impl<void, E>(other.has_value())
- {
- if ( this->has_value() ) ;
- else this->construct_error( other.error() );
- }
-
- storage_t( storage_t && other ) = delete;
-};
-
-template< typename T, typename E >
-class storage_t<T, E, false, true> : public storage_t_impl<T, E>
-{
-public:
- storage_t() = default;
- ~storage_t() = default;
-
- explicit storage_t( bool has_value )
- : storage_t_impl<T, E>( has_value )
- {}
-
- storage_t( storage_t const & other ) = delete;
-
- storage_t( storage_t && other )
- : storage_t_impl<T, E>( other.has_value() )
- {
- if ( this->has_value() ) this->construct_value( std::move( other.value() ) );
- else this->construct_error( std::move( other.error() ) );
- }
-};
-
-template< typename E >
-class storage_t<void, E, false, true> : public storage_t_impl<void, E>
-{
-public:
- storage_t() = default;
- ~storage_t() = default;
-
- explicit storage_t( bool has_value )
- : storage_t_impl<void, E>( has_value )
- {}
-
- storage_t( storage_t const & other ) = delete;
-
- storage_t( storage_t && other )
- : storage_t_impl<void, E>( other.has_value() )
- {
- if ( this->has_value() ) ;
- else this->construct_error( std::move( other.error() ) );
- }
-};
-
-} // namespace detail
-
-/// x.x.5 Unexpected object type; unexpected_type; C++17 and later can also use aliased type unexpected.
-
-#if nsel_P0323R <= 2
-template< typename E = std::exception_ptr >
-class unexpected_type
-#else
-template< typename E >
-class unexpected_type
-#endif // nsel_P0323R
-{
-public:
- using error_type = E;
-
- // x.x.5.2.1 Constructors
-
-// unexpected_type() = delete;
-
- constexpr unexpected_type( unexpected_type const & ) = default;
- constexpr unexpected_type( unexpected_type && ) = default;
-
- template< typename... Args
- nsel_REQUIRES_T(
- std::is_constructible<E, Args&&...>::value
- )
- >
- constexpr explicit unexpected_type( nonstd_lite_in_place_t(E), Args &&... args )
- : m_error( std::forward<Args>( args )...)
- {}
-
- template< typename U, typename... Args
- nsel_REQUIRES_T(
- std::is_constructible<E, std::initializer_list<U>, Args&&...>::value
- )
- >
- constexpr explicit unexpected_type( nonstd_lite_in_place_t(E), std::initializer_list<U> il, Args &&... args )
- : m_error( il, std::forward<Args>( args )...)
- {}
-
- template< typename E2
- nsel_REQUIRES_T(
- std::is_constructible<E,E2>::value
- && !std::is_same< typename std20::remove_cvref<E2>::type, nonstd_lite_in_place_t(E2) >::value
- && !std::is_same< typename std20::remove_cvref<E2>::type, unexpected_type >::value
- )
- >
- constexpr explicit unexpected_type( E2 && error )
- : m_error( std::forward<E2>( error ) )
- {}
-
- template< typename E2
- nsel_REQUIRES_T(
- std::is_constructible< E, E2>::value
- && !std::is_constructible<E, unexpected_type<E2> & >::value
- && !std::is_constructible<E, unexpected_type<E2> >::value
- && !std::is_constructible<E, unexpected_type<E2> const & >::value
- && !std::is_constructible<E, unexpected_type<E2> const >::value
- && !std::is_convertible< unexpected_type<E2> &, E>::value
- && !std::is_convertible< unexpected_type<E2> , E>::value
- && !std::is_convertible< unexpected_type<E2> const &, E>::value
- && !std::is_convertible< unexpected_type<E2> const , E>::value
- && !std::is_convertible< E2 const &, E>::value /*=> explicit */
- )
- >
- constexpr explicit unexpected_type( unexpected_type<E2> const & error )
- : m_error( E{ error.value() } )
- {}
-
- template< typename E2
- nsel_REQUIRES_T(
- std::is_constructible< E, E2>::value
- && !std::is_constructible<E, unexpected_type<E2> & >::value
- && !std::is_constructible<E, unexpected_type<E2> >::value
- && !std::is_constructible<E, unexpected_type<E2> const & >::value
- && !std::is_constructible<E, unexpected_type<E2> const >::value
- && !std::is_convertible< unexpected_type<E2> &, E>::value
- && !std::is_convertible< unexpected_type<E2> , E>::value
- && !std::is_convertible< unexpected_type<E2> const &, E>::value
- && !std::is_convertible< unexpected_type<E2> const , E>::value
- && std::is_convertible< E2 const &, E>::value /*=> explicit */
- )
- >
- constexpr /*non-explicit*/ unexpected_type( unexpected_type<E2> const & error )
- : m_error( error.value() )
- {}
-
- template< typename E2
- nsel_REQUIRES_T(
- std::is_constructible< E, E2>::value
- && !std::is_constructible<E, unexpected_type<E2> & >::value
- && !std::is_constructible<E, unexpected_type<E2> >::value
- && !std::is_constructible<E, unexpected_type<E2> const & >::value
- && !std::is_constructible<E, unexpected_type<E2> const >::value
- && !std::is_convertible< unexpected_type<E2> &, E>::value
- && !std::is_convertible< unexpected_type<E2> , E>::value
- && !std::is_convertible< unexpected_type<E2> const &, E>::value
- && !std::is_convertible< unexpected_type<E2> const , E>::value
- && !std::is_convertible< E2 const &, E>::value /*=> explicit */
- )
- >
- constexpr explicit unexpected_type( unexpected_type<E2> && error )
- : m_error( E{ std::move( error.value() ) } )
- {}
-
- template< typename E2
- nsel_REQUIRES_T(
- std::is_constructible< E, E2>::value
- && !std::is_constructible<E, unexpected_type<E2> & >::value
- && !std::is_constructible<E, unexpected_type<E2> >::value
- && !std::is_constructible<E, unexpected_type<E2> const & >::value
- && !std::is_constructible<E, unexpected_type<E2> const >::value
- && !std::is_convertible< unexpected_type<E2> &, E>::value
- && !std::is_convertible< unexpected_type<E2> , E>::value
- && !std::is_convertible< unexpected_type<E2> const &, E>::value
- && !std::is_convertible< unexpected_type<E2> const , E>::value
- && std::is_convertible< E2 const &, E>::value /*=> non-explicit */
- )
- >
- constexpr /*non-explicit*/ unexpected_type( unexpected_type<E2> && error )
- : m_error( std::move( error.value() ) )
- {}
-
- // x.x.5.2.2 Assignment
-
- nsel_constexpr14 unexpected_type& operator=( unexpected_type const & ) = default;
- nsel_constexpr14 unexpected_type& operator=( unexpected_type && ) = default;
-
- template< typename E2 = E >
- nsel_constexpr14 unexpected_type & operator=( unexpected_type<E2> const & other )
- {
- unexpected_type{ other.value() }.swap( *this );
- return *this;
- }
-
- template< typename E2 = E >
- nsel_constexpr14 unexpected_type & operator=( unexpected_type<E2> && other )
- {
- unexpected_type{ std::move( other.value() ) }.swap( *this );
- return *this;
- }
-
- // x.x.5.2.3 Observers
-
- nsel_constexpr14 E & value() & noexcept
- {
- return m_error;
- }
-
- constexpr E const & value() const & noexcept
- {
- return m_error;
- }
-
-#if !nsel_COMPILER_GNUC_VERSION || nsel_COMPILER_GNUC_VERSION >= 490
-
- nsel_constexpr14 E && value() && noexcept
- {
- return std::move( m_error );
- }
-
- constexpr E const && value() const && noexcept
- {
- return std::move( m_error );
- }
-
-#endif
-
- // x.x.5.2.4 Swap
-
- nsel_REQUIRES_R( void,
- std17::is_swappable<E>::value
- )
- swap( unexpected_type & other ) noexcept (
- std17::is_nothrow_swappable<E>::value
- )
- {
- using std::swap;
- swap( m_error, other.m_error );
- }
-
- // TODO: ??? unexpected_type: in-class friend operator==, !=
-
-private:
- error_type m_error;
-};
-
-#if nsel_CPP17_OR_GREATER
-
-/// template deduction guide:
-
-template< typename E >
-unexpected_type( E ) -> unexpected_type< E >;
-
-#endif
-
-/// class unexpected_type, std::exception_ptr specialization (P0323R2)
-
-#if !nsel_CONFIG_NO_EXCEPTIONS
-#if nsel_P0323R <= 2
-
-// TODO: Should expected be specialized for particular E types such as exception_ptr and how?
-// See p0323r7 2.1. Ergonomics, http://wg21.link/p0323
-template<>
-class unexpected_type< std::exception_ptr >
-{
-public:
- using error_type = std::exception_ptr;
-
- unexpected_type() = delete;
-
- ~unexpected_type(){}
-
- explicit unexpected_type( std::exception_ptr const & error )
- : m_error( error )
- {}
-
- explicit unexpected_type(std::exception_ptr && error )
- : m_error( std::move( error ) )
- {}
-
- template< typename E >
- explicit unexpected_type( E error )
- : m_error( std::make_exception_ptr( error ) )
- {}
-
- std::exception_ptr const & value() const
- {
- return m_error;
- }
-
- std::exception_ptr & value()
- {
- return m_error;
- }
-
-private:
- std::exception_ptr m_error;
-};
-
-#endif // nsel_P0323R
-#endif // !nsel_CONFIG_NO_EXCEPTIONS
-
-/// x.x.4, Unexpected equality operators
-
-template< typename E1, typename E2 >
-constexpr bool operator==( unexpected_type<E1> const & x, unexpected_type<E2> const & y )
-{
- return x.value() == y.value();
-}
-
-template< typename E1, typename E2 >
-constexpr bool operator!=( unexpected_type<E1> const & x, unexpected_type<E2> const & y )
-{
- return ! ( x == y );
-}
-
-#if nsel_P0323R <= 2
-
-template< typename E >
-constexpr bool operator<( unexpected_type<E> const & x, unexpected_type<E> const & y )
-{
- return x.value() < y.value();
-}
-
-template< typename E >
-constexpr bool operator>( unexpected_type<E> const & x, unexpected_type<E> const & y )
-{
- return ( y < x );
-}
-
-template< typename E >
-constexpr bool operator<=( unexpected_type<E> const & x, unexpected_type<E> const & y )
-{
- return ! ( y < x );
-}
-
-template< typename E >
-constexpr bool operator>=( unexpected_type<E> const & x, unexpected_type<E> const & y )
-{
- return ! ( x < y );
-}
-
-#endif // nsel_P0323R
-
-/// x.x.5 Specialized algorithms
-
-template< typename E
- nsel_REQUIRES_T(
- std17::is_swappable<E>::value
- )
->
-void swap( unexpected_type<E> & x, unexpected_type<E> & y) noexcept ( noexcept ( x.swap(y) ) )
-{
- x.swap( y );
-}
-
-#if nsel_P0323R <= 2
-
-// unexpected: relational operators for std::exception_ptr:
-
-inline constexpr bool operator<( unexpected_type<std::exception_ptr> const & /*x*/, unexpected_type<std::exception_ptr> const & /*y*/ )
-{
- return false;
-}
-
-inline constexpr bool operator>( unexpected_type<std::exception_ptr> const & /*x*/, unexpected_type<std::exception_ptr> const & /*y*/ )
-{
- return false;
-}
-
-inline constexpr bool operator<=( unexpected_type<std::exception_ptr> const & x, unexpected_type<std::exception_ptr> const & y )
-{
- return ( x == y );
-}
-
-inline constexpr bool operator>=( unexpected_type<std::exception_ptr> const & x, unexpected_type<std::exception_ptr> const & y )
-{
- return ( x == y );
-}
-
-#endif // nsel_P0323R
-
-// unexpected: traits
-
-#if nsel_P0323R <= 3
-
-template< typename E>
-struct is_unexpected : std::false_type {};
-
-template< typename E>
-struct is_unexpected< unexpected_type<E> > : std::true_type {};
-
-#endif // nsel_P0323R
-
-// unexpected: factory
-
-// keep make_unexpected() removed in p0323r2 for pre-C++17:
-
-template< typename E>
-nsel_constexpr14 auto
-make_unexpected( E && value ) -> unexpected_type< typename std::decay<E>::type >
-{
- return unexpected_type< typename std::decay<E>::type >( std::forward<E>(value) );
-}
-
-#if nsel_P0323R <= 3
-
-/*nsel_constexpr14*/ auto inline
-make_unexpected_from_current_exception() -> unexpected_type< std::exception_ptr >
-{
- return unexpected_type< std::exception_ptr >( std::current_exception() );
-}
-
-#endif // nsel_P0323R
-
-/// x.x.6, x.x.7 expected access error
-
-template< typename E >
-class bad_expected_access;
-
-/// x.x.7 bad_expected_access<void>: expected access error
-
-template <>
-class bad_expected_access< void > : public std::exception
-{
-public:
- explicit bad_expected_access()
- : std::exception()
- {}
-};
-
-/// x.x.6 bad_expected_access: expected access error
-
-#if !nsel_CONFIG_NO_EXCEPTIONS
-
-template< typename E >
-class bad_expected_access : public bad_expected_access< void >
-{
-public:
- using error_type = E;
-
- explicit bad_expected_access( error_type error )
- : m_error( error )
- {}
-
- virtual char const * what() const noexcept override
- {
- return "bad_expected_access";
- }
-
- nsel_constexpr14 error_type & error() &
- {
- return m_error;
- }
-
- constexpr error_type const & error() const &
- {
- return m_error;
- }
-
-#if !nsel_COMPILER_GNUC_VERSION || nsel_COMPILER_GNUC_VERSION >= 490
-
- nsel_constexpr14 error_type && error() &&
- {
- return std::move( m_error );
- }
-
- constexpr error_type const && error() const &&
- {
- return std::move( m_error );
- }
-
-#endif
-
-private:
- error_type m_error;
-};
-
-#endif // nsel_CONFIG_NO_EXCEPTIONS
-
-/// x.x.8 unexpect tag, in_place_unexpected tag: construct an error
-
-struct unexpect_t{};
-using in_place_unexpected_t = unexpect_t;
-
-nsel_inline17 constexpr unexpect_t unexpect{};
-nsel_inline17 constexpr unexpect_t in_place_unexpected{};
-
-/// class error_traits
-
-#if nsel_CONFIG_NO_EXCEPTIONS
-
-namespace detail {
- inline bool text( char const * /*text*/ ) { return true; }
-}
-
-template< typename Error >
-struct error_traits
-{
- static void rethrow( Error const & /*e*/ )
- {
-#if nsel_CONFIG_NO_EXCEPTIONS_SEH
- RaiseException( EXCEPTION_ACCESS_VIOLATION, EXCEPTION_NONCONTINUABLE, 0, NULL );
-#else
- assert( false && detail::text("throw bad_expected_access<Error>{ e };") );
-#endif
- }
-};
-
-template<>
-struct error_traits< std::exception_ptr >
-{
- static void rethrow( std::exception_ptr const & /*e*/ )
- {
-#if nsel_CONFIG_NO_EXCEPTIONS_SEH
- RaiseException( EXCEPTION_ACCESS_VIOLATION, EXCEPTION_NONCONTINUABLE, 0, NULL );
-#else
- assert( false && detail::text("throw bad_expected_access<std::exception_ptr>{ e };") );
-#endif
- }
-};
-
-template<>
-struct error_traits< std::error_code >
-{
- static void rethrow( std::error_code const & /*e*/ )
- {
-#if nsel_CONFIG_NO_EXCEPTIONS_SEH
- RaiseException( EXCEPTION_ACCESS_VIOLATION, EXCEPTION_NONCONTINUABLE, 0, NULL );
-#else
- assert( false && detail::text("throw std::system_error( e );") );
-#endif
- }
-};
-
-#else // nsel_CONFIG_NO_EXCEPTIONS
-
-template< typename Error >
-struct error_traits
-{
- static void rethrow( Error const & e )
- {
- throw bad_expected_access<Error>{ e };
- }
-};
-
-template<>
-struct error_traits< std::exception_ptr >
-{
- static void rethrow( std::exception_ptr const & e )
- {
- std::rethrow_exception( e );
- }
-};
-
-template<>
-struct error_traits< std::error_code >
-{
- static void rethrow( std::error_code const & e )
- {
- throw std::system_error( e );
- }
-};
-
-#endif // nsel_CONFIG_NO_EXCEPTIONS
-
-} // namespace expected_lite
-
-// provide nonstd::unexpected_type:
-
-using expected_lite::unexpected_type;
-
-namespace expected_lite {
-
-/// class expected
-
-#if nsel_P0323R <= 2
-template< typename T, typename E = std::exception_ptr >
-class expected
-#else
-template< typename T, typename E >
-class expected
-#endif // nsel_P0323R
-{
-private:
- template< typename, typename > friend class expected;
-
-public:
- using value_type = T;
- using error_type = E;
- using unexpected_type = nonstd::unexpected_type<E>;
-
- template< typename U >
- struct rebind
- {
- using type = expected<U, error_type>;
- };
-
- // x.x.4.1 constructors
-
- nsel_REQUIRES_0(
- std::is_default_constructible<T>::value
- )
- nsel_constexpr14 expected()
- : contained( true )
- {
- contained.construct_value( value_type() );
- }
-
- nsel_constexpr14 expected( expected const & ) = default;
- nsel_constexpr14 expected( expected && ) = default;
-
- template< typename U, typename G
- nsel_REQUIRES_T(
- std::is_constructible< T, U const &>::value
- && std::is_constructible<E, G const &>::value
- && !std::is_constructible<T, expected<U, G> & >::value
- && !std::is_constructible<T, expected<U, G> && >::value
- && !std::is_constructible<T, expected<U, G> const & >::value
- && !std::is_constructible<T, expected<U, G> const && >::value
- && !std::is_convertible< expected<U, G> & , T>::value
- && !std::is_convertible< expected<U, G> &&, T>::value
- && !std::is_convertible< expected<U, G> const & , T>::value
- && !std::is_convertible< expected<U, G> const &&, T>::value
- && (!std::is_convertible<U const &, T>::value || !std::is_convertible<G const &, E>::value ) /*=> explicit */
- )
- >
- nsel_constexpr14 explicit expected( expected<U, G> const & other )
- : contained( other.has_value() )
- {
- if ( has_value() ) contained.construct_value( T{ other.contained.value() } );
- else contained.construct_error( E{ other.contained.error() } );
- }
-
- template< typename U, typename G
- nsel_REQUIRES_T(
- std::is_constructible< T, U const &>::value
- && std::is_constructible<E, G const &>::value
- && !std::is_constructible<T, expected<U, G> & >::value
- && !std::is_constructible<T, expected<U, G> && >::value
- && !std::is_constructible<T, expected<U, G> const & >::value
- && !std::is_constructible<T, expected<U, G> const && >::value
- && !std::is_convertible< expected<U, G> & , T>::value
- && !std::is_convertible< expected<U, G> &&, T>::value
- && !std::is_convertible< expected<U, G> const &, T>::value
- && !std::is_convertible< expected<U, G> const &&, T>::value
- && !(!std::is_convertible<U const &, T>::value || !std::is_convertible<G const &, E>::value ) /*=> non-explicit */
- )
- >
- nsel_constexpr14 /*non-explicit*/ expected( expected<U, G> const & other )
- : contained( other.has_value() )
- {
- if ( has_value() ) contained.construct_value( other.contained.value() );
- else contained.construct_error( other.contained.error() );
- }
-
- template< typename U, typename G
- nsel_REQUIRES_T(
- std::is_constructible< T, U>::value
- && std::is_constructible<E, G>::value
- && !std::is_constructible<T, expected<U, G> & >::value
- && !std::is_constructible<T, expected<U, G> && >::value
- && !std::is_constructible<T, expected<U, G> const & >::value
- && !std::is_constructible<T, expected<U, G> const && >::value
- && !std::is_convertible< expected<U, G> & , T>::value
- && !std::is_convertible< expected<U, G> &&, T>::value
- && !std::is_convertible< expected<U, G> const & , T>::value
- && !std::is_convertible< expected<U, G> const &&, T>::value
- && (!std::is_convertible<U, T>::value || !std::is_convertible<G, E>::value ) /*=> explicit */
- )
- >
- nsel_constexpr14 explicit expected( expected<U, G> && other )
- : contained( other.has_value() )
- {
- if ( has_value() ) contained.construct_value( T{ std::move( other.contained.value() ) } );
- else contained.construct_error( E{ std::move( other.contained.error() ) } );
- }
-
- template< typename U, typename G
- nsel_REQUIRES_T(
- std::is_constructible< T, U>::value
- && std::is_constructible<E, G>::value
- && !std::is_constructible<T, expected<U, G> & >::value
- && !std::is_constructible<T, expected<U, G> && >::value
- && !std::is_constructible<T, expected<U, G> const & >::value
- && !std::is_constructible<T, expected<U, G> const && >::value
- && !std::is_convertible< expected<U, G> & , T>::value
- && !std::is_convertible< expected<U, G> &&, T>::value
- && !std::is_convertible< expected<U, G> const & , T>::value
- && !std::is_convertible< expected<U, G> const &&, T>::value
- && !(!std::is_convertible<U, T>::value || !std::is_convertible<G, E>::value ) /*=> non-explicit */
- )
- >
- nsel_constexpr14 /*non-explicit*/ expected( expected<U, G> && other )
- : contained( other.has_value() )
- {
- if ( has_value() ) contained.construct_value( std::move( other.contained.value() ) );
- else contained.construct_error( std::move( other.contained.error() ) );
- }
-
- template< typename U = T
- nsel_REQUIRES_T(
- std::is_copy_constructible<U>::value
- )
- >
- nsel_constexpr14 expected( value_type const & value )
- : contained( true )
- {
- contained.construct_value( value );
- }
-
- template< typename U = T
- nsel_REQUIRES_T(
- std::is_constructible<T,U&&>::value
- && !std::is_same<typename std20::remove_cvref<U>::type, nonstd_lite_in_place_t(U)>::value
- && !std::is_same< expected<T,E> , typename std20::remove_cvref<U>::type>::value
- && !std::is_same<nonstd::unexpected_type<E>, typename std20::remove_cvref<U>::type>::value
- && !std::is_convertible<U&&,T>::value /*=> explicit */
- )
- >
- nsel_constexpr14 explicit expected( U && value ) noexcept
- (
- std::is_nothrow_move_constructible<U>::value &&
- std::is_nothrow_move_constructible<E>::value
- )
- : contained( true )
- {
- contained.construct_value( T{ std::forward<U>( value ) } );
- }
-
- template< typename U = T
- nsel_REQUIRES_T(
- std::is_constructible<T,U&&>::value
- && !std::is_same<typename std20::remove_cvref<U>::type, nonstd_lite_in_place_t(U)>::value
- && !std::is_same< expected<T,E> , typename std20::remove_cvref<U>::type>::value
- && !std::is_same<nonstd::unexpected_type<E>, typename std20::remove_cvref<U>::type>::value
- && std::is_convertible<U&&,T>::value /*=> non-explicit */
- )
- >
- nsel_constexpr14 /*non-explicit*/ expected( U && value ) noexcept
- (
- std::is_nothrow_move_constructible<U>::value &&
- std::is_nothrow_move_constructible<E>::value
- )
- : contained( true )
- {
- contained.construct_value( std::forward<U>( value ) );
- }
-
- // construct error:
-
- template< typename G = E
- nsel_REQUIRES_T(
- std::is_constructible<E, G const & >::value
- && !std::is_convertible< G const &, E>::value /*=> explicit */
- )
- >
- nsel_constexpr14 explicit expected( nonstd::unexpected_type<G> const & error )
- : contained( false )
- {
- contained.construct_error( E{ error.value() } );
- }
-
- template< typename G = E
- nsel_REQUIRES_T(
- std::is_constructible<E, G const & >::value
- && std::is_convertible< G const &, E>::value /*=> non-explicit */
- )
- >
- nsel_constexpr14 /*non-explicit*/ expected( nonstd::unexpected_type<G> const & error )
- : contained( false )
- {
- contained.construct_error( error.value() );
- }
-
- template< typename G = E
- nsel_REQUIRES_T(
- std::is_constructible<E, G&& >::value
- && !std::is_convertible< G&&, E>::value /*=> explicit */
- )
- >
- nsel_constexpr14 explicit expected( nonstd::unexpected_type<G> && error )
- : contained( false )
- {
- contained.construct_error( E{ std::move( error.value() ) } );
- }
-
- template< typename G = E
- nsel_REQUIRES_T(
- std::is_constructible<E, G&& >::value
- && std::is_convertible< G&&, E>::value /*=> non-explicit */
- )
- >
- nsel_constexpr14 /*non-explicit*/ expected( nonstd::unexpected_type<G> && error )
- : contained( false )
- {
- contained.construct_error( std::move( error.value() ) );
- }
-
- // in-place construction, value
-
- template< typename... Args
- nsel_REQUIRES_T(
- std::is_constructible<T, Args&&...>::value
- )
- >
- nsel_constexpr14 explicit expected( nonstd_lite_in_place_t(T), Args&&... args )
- : contained( true )
- {
- contained.emplace_value( std::forward<Args>( args )... );
- }
-
- template< typename U, typename... Args
- nsel_REQUIRES_T(
- std::is_constructible<T, std::initializer_list<U>, Args&&...>::value
- )
- >
- nsel_constexpr14 explicit expected( nonstd_lite_in_place_t(T), std::initializer_list<U> il, Args&&... args )
- : contained( true )
- {
- contained.emplace_value( il, std::forward<Args>( args )... );
- }
-
- // in-place construction, error
-
- template< typename... Args
- nsel_REQUIRES_T(
- std::is_constructible<E, Args&&...>::value
- )
- >
- nsel_constexpr14 explicit expected( unexpect_t, Args&&... args )
- : contained( false )
- {
- contained.emplace_error( std::forward<Args>( args )... );
- }
-
- template< typename U, typename... Args
- nsel_REQUIRES_T(
- std::is_constructible<E, std::initializer_list<U>, Args&&...>::value
- )
- >
- nsel_constexpr14 explicit expected( unexpect_t, std::initializer_list<U> il, Args&&... args )
- : contained( false )
- {
- contained.emplace_error( il, std::forward<Args>( args )... );
- }
-
- // x.x.4.2 destructor
-
- // TODO: ~expected: triviality
- // Effects: If T is not cv void and is_trivially_destructible_v<T> is false and bool(*this), calls val.~T(). If is_trivially_destructible_v<E> is false and !bool(*this), calls unexpect.~unexpected<E>().
- // Remarks: If either T is cv void or is_trivially_destructible_v<T> is true, and is_trivially_destructible_v<E> is true, then this destructor shall be a trivial destructor.
-
- ~expected()
- {
- if ( has_value() ) contained.destruct_value();
- else contained.destruct_error();
- }
-
- // x.x.4.3 assignment
-
- expected & operator=( expected const & other )
- {
- expected( other ).swap( *this );
- return *this;
- }
-
- expected & operator=( expected && other ) noexcept
- (
- std::is_nothrow_move_constructible< T>::value
- && std::is_nothrow_move_assignable< T>::value
- && std::is_nothrow_move_constructible<E>::value // added for missing
- && std::is_nothrow_move_assignable< E>::value ) // nothrow above
- {
- expected( std::move( other ) ).swap( *this );
- return *this;
- }
-
- template< typename U
- nsel_REQUIRES_T(
- !std::is_same<expected<T,E>, typename std20::remove_cvref<U>::type>::value
- && std17::conjunction<std::is_scalar<T>, std::is_same<T, std::decay<U>> >::value
- && std::is_constructible<T ,U>::value
- && std::is_assignable< T&,U>::value
- && std::is_nothrow_move_constructible<E>::value )
- >
- expected & operator=( U && value )
- {
- expected( std::forward<U>( value ) ).swap( *this );
- return *this;
- }
-
- template< typename G = E
- nsel_REQUIRES_T(
- std::is_constructible<E, G const&>::value &&
- std::is_copy_constructible<G>::value // TODO: std::is_nothrow_copy_constructible<G>
- && std::is_copy_assignable<G>::value
- )
- >
- expected & operator=( nonstd::unexpected_type<G> const & error )
- {
- expected( unexpect, error.value() ).swap( *this );
- return *this;
- }
-
- template< typename G = E
- nsel_REQUIRES_T(
- std::is_constructible<E, G&&>::value &&
- std::is_move_constructible<G>::value // TODO: std::is_nothrow_move_constructible<G>
- && std::is_move_assignable<G>::value
- )
- >
- expected & operator=( nonstd::unexpected_type<G> && error )
- {
- expected( unexpect, std::move( error.value() ) ).swap( *this );
- return *this;
- }
-
- template< typename... Args
- nsel_REQUIRES_T(
- std::is_nothrow_constructible<T, Args&&...>::value
- )
- >
- value_type & emplace( Args &&... args )
- {
- expected( nonstd_lite_in_place(T), std::forward<Args>(args)... ).swap( *this );
- return value();
- }
-
- template< typename U, typename... Args
- nsel_REQUIRES_T(
- std::is_nothrow_constructible<T, std::initializer_list<U>&, Args&&...>::value
- )
- >
- value_type & emplace( std::initializer_list<U> il, Args &&... args )
- {
- expected( nonstd_lite_in_place(T), il, std::forward<Args>(args)... ).swap( *this );
- return value();
- }
-
- // x.x.4.4 swap
-
- template< typename U=T, typename G=E >
- nsel_REQUIRES_R( void,
- std17::is_swappable< U>::value
- && std17::is_swappable<G>::value
- && ( std::is_move_constructible<U>::value || std::is_move_constructible<G>::value )
- )
- swap( expected & other ) noexcept
- (
- std::is_nothrow_move_constructible<T>::value && std17::is_nothrow_swappable<T&>::value &&
- std::is_nothrow_move_constructible<E>::value && std17::is_nothrow_swappable<E&>::value
- )
- {
- using std::swap;
-
- if ( bool(*this) && bool(other) ) { swap( contained.value(), other.contained.value() ); }
- else if ( ! bool(*this) && ! bool(other) ) { swap( contained.error(), other.contained.error() ); }
- else if ( bool(*this) && ! bool(other) ) { error_type t( std::move( other.error() ) );
- other.contained.destruct_error();
- other.contained.construct_value( std::move( contained.value() ) );
- contained.destruct_value();
- contained.construct_error( std::move( t ) );
- bool has_value = contained.has_value();
- bool other_has_value = other.has_value();
- other.contained.set_has_value(has_value);
- contained.set_has_value(other_has_value);
- }
- else if ( ! bool(*this) && bool(other) ) { other.swap( *this ); }
- }
-
- // x.x.4.5 observers
-
- constexpr value_type const * operator ->() const
- {
- return assert( has_value() ), contained.value_ptr();
- }
-
- value_type * operator ->()
- {
- return assert( has_value() ), contained.value_ptr();
- }
-
- constexpr value_type const & operator *() const &
- {
- return assert( has_value() ), contained.value();
- }
-
- value_type & operator *() &
- {
- return assert( has_value() ), contained.value();
- }
-
-#if !nsel_COMPILER_GNUC_VERSION || nsel_COMPILER_GNUC_VERSION >= 490
-
- constexpr value_type const && operator *() const &&
- {
- return std::move( ( assert( has_value() ), contained.value() ) );
- }
-
- nsel_constexpr14 value_type && operator *() &&
- {
- return std::move( ( assert( has_value() ), contained.value() ) );
- }
-
-#endif
-
- constexpr explicit operator bool() const noexcept
- {
- return has_value();
- }
-
- constexpr bool has_value() const noexcept
- {
- return contained.has_value();
- }
-
- constexpr value_type const & value() const &
- {
- return has_value()
- ? ( contained.value() )
- : ( error_traits<error_type>::rethrow( contained.error() ), contained.value() );
- }
-
- value_type & value() &
- {
- return has_value()
- ? ( contained.value() )
- : ( error_traits<error_type>::rethrow( contained.error() ), contained.value() );
- }
-
-#if !nsel_COMPILER_GNUC_VERSION || nsel_COMPILER_GNUC_VERSION >= 490
-
- constexpr value_type const && value() const &&
- {
- return std::move( has_value()
- ? ( contained.value() )
- : ( error_traits<error_type>::rethrow( contained.error() ), contained.value() ) );
- }
-
- nsel_constexpr14 value_type && value() &&
- {
- return std::move( has_value()
- ? ( contained.value() )
- : ( error_traits<error_type>::rethrow( contained.error() ), contained.value() ) );
- }
-
-#endif
-
- constexpr error_type const & error() const &
- {
- return assert( ! has_value() ), contained.error();
- }
-
- error_type & error() &
- {
- return assert( ! has_value() ), contained.error();
- }
-
-#if !nsel_COMPILER_GNUC_VERSION || nsel_COMPILER_GNUC_VERSION >= 490
-
- constexpr error_type const && error() const &&
- {
- return std::move( ( assert( ! has_value() ), contained.error() ) );
- }
-
- error_type && error() &&
- {
- return std::move( ( assert( ! has_value() ), contained.error() ) );
- }
-
-#endif
-
- constexpr unexpected_type get_unexpected() const
- {
- return make_unexpected( contained.error() );
- }
-
- template< typename Ex >
- bool has_exception() const
- {
- using ContainedEx = typename std::remove_reference< decltype( get_unexpected().value() ) >::type;
- return ! has_value() && std::is_base_of< Ex, ContainedEx>::value;
- }
-
- template< typename U
- nsel_REQUIRES_T(
- std::is_copy_constructible< T>::value
- && std::is_convertible<U&&, T>::value
- )
- >
- value_type value_or( U && v ) const &
- {
- return has_value()
- ? contained.value()
- : static_cast<T>( std::forward<U>( v ) );
- }
-
- template< typename U
- nsel_REQUIRES_T(
- std::is_move_constructible< T>::value
- && std::is_convertible<U&&, T>::value
- )
- >
- value_type value_or( U && v ) &&
- {
- return has_value()
- ? std::move( contained.value() )
- : static_cast<T>( std::forward<U>( v ) );
- }
-
- // unwrap()
-
-// template <class U, class E>
-// constexpr expected<U,E> expected<expected<U,E>,E>::unwrap() const&;
-
-// template <class T, class E>
-// constexpr expected<T,E> expected<T,E>::unwrap() const&;
-
-// template <class U, class E>
-// expected<U,E> expected<expected<U,E>, E>::unwrap() &&;
-
-// template <class T, class E>
-// template expected<T,E> expected<T,E>::unwrap() &&;
-
- // factories
-
-// template< typename Ex, typename F>
-// expected<T,E> catch_exception(F&& f);
-
-// template< typename F>
-// expected<decltype(func(declval<T>())),E> map(F&& func) ;
-
-// template< typename F>
-// 'see below' bind(F&& func);
-
-// template< typename F>
-// expected<T,E> catch_error(F&& f);
-
-// template< typename F>
-// 'see below' then(F&& func);
-
-private:
- detail::storage_t
- <
- T
- ,E
- , std::is_copy_constructible<T>::value && std::is_copy_constructible<E>::value
- , std::is_move_constructible<T>::value && std::is_move_constructible<E>::value
- >
- contained;
-};
-
-/// class expected, void specialization
-
-template< typename E >
-class expected<void, E>
-{
-private:
- template< typename, typename > friend class expected;
-
-public:
- using value_type = void;
- using error_type = E;
- using unexpected_type = nonstd::unexpected_type<E>;
-
- // x.x.4.1 constructors
-
- constexpr expected() noexcept
- : contained( true )
- {}
-
- nsel_constexpr14 expected( expected const & other ) = default;
- nsel_constexpr14 expected( expected && other ) = default;
-
- constexpr explicit expected( nonstd_lite_in_place_t(void) )
- : contained( true )
- {}
-
- template< typename G = E
- nsel_REQUIRES_T(
- !std::is_convertible<G const &, E>::value /*=> explicit */
- )
- >
- nsel_constexpr14 explicit expected( nonstd::unexpected_type<G> const & error )
- : contained( false )
- {
- contained.construct_error( E{ error.value() } );
- }
-
- template< typename G = E
- nsel_REQUIRES_T(
- std::is_convertible<G const &, E>::value /*=> non-explicit */
- )
- >
- nsel_constexpr14 /*non-explicit*/ expected( nonstd::unexpected_type<G> const & error )
- : contained( false )
- {
- contained.construct_error( error.value() );
- }
-
- template< typename G = E
- nsel_REQUIRES_T(
- !std::is_convertible<G&&, E>::value /*=> explicit */
- )
- >
- nsel_constexpr14 explicit expected( nonstd::unexpected_type<G> && error )
- : contained( false )
- {
- contained.construct_error( E{ std::move( error.value() ) } );
- }
-
- template< typename G = E
- nsel_REQUIRES_T(
- std::is_convertible<G&&, E>::value /*=> non-explicit */
- )
- >
- nsel_constexpr14 /*non-explicit*/ expected( nonstd::unexpected_type<G> && error )
- : contained( false )
- {
- contained.construct_error( std::move( error.value() ) );
- }
-
- template< typename... Args
- nsel_REQUIRES_T(
- std::is_constructible<E, Args&&...>::value
- )
- >
- nsel_constexpr14 explicit expected( unexpect_t, Args&&... args )
- : contained( false )
- {
- contained.emplace_error( std::forward<Args>( args )... );
- }
-
- template< typename U, typename... Args
- nsel_REQUIRES_T(
- std::is_constructible<E, std::initializer_list<U>, Args&&...>::value
- )
- >
- nsel_constexpr14 explicit expected( unexpect_t, std::initializer_list<U> il, Args&&... args )
- : contained( false )
- {
- contained.emplace_error( il, std::forward<Args>( args )... );
- }
-
- // destructor
-
- ~expected()
- {
- if ( ! has_value() )
- {
- contained.destruct_error();
- }
- }
-
- // x.x.4.3 assignment
-
- expected & operator=( expected const & other )
- {
- expected( other ).swap( *this );
- return *this;
- }
-
- expected & operator=( expected && other ) noexcept
- (
- std::is_nothrow_move_assignable<E>::value &&
- std::is_nothrow_move_constructible<E>::value )
- {
- expected( std::move( other ) ).swap( *this );
- return *this;
- }
-
- void emplace()
- {
- expected().swap( *this );
- }
-
- // x.x.4.4 swap
-
- template< typename G = E >
- nsel_REQUIRES_R( void,
- std17::is_swappable<G>::value
- && std::is_move_constructible<G>::value
- )
- swap( expected & other ) noexcept
- (
- std::is_nothrow_move_constructible<E>::value && std17::is_nothrow_swappable<E&>::value
- )
- {
- using std::swap;
-
- if ( ! bool(*this) && ! bool(other) ) { swap( contained.error(), other.contained.error() ); }
- else if ( bool(*this) && ! bool(other) ) { contained.construct_error( std::move( other.error() ) );
- bool has_value = contained.has_value();
- bool other_has_value = other.has_value();
- other.contained.set_has_value(has_value);
- contained.set_has_value(other_has_value);
- }
- else if ( ! bool(*this) && bool(other) ) { other.swap( *this ); }
- }
-
- // x.x.4.5 observers
-
- constexpr explicit operator bool() const noexcept
- {
- return has_value();
- }
-
- constexpr bool has_value() const noexcept
- {
- return contained.has_value();
- }
-
- void value() const
- {
- if ( ! has_value() )
- {
- error_traits<error_type>::rethrow( contained.error() );
- }
- }
-
- constexpr error_type const & error() const &
- {
- return assert( ! has_value() ), contained.error();
- }
-
- error_type & error() &
- {
- return assert( ! has_value() ), contained.error();
- }
-
-#if !nsel_COMPILER_GNUC_VERSION || nsel_COMPILER_GNUC_VERSION >= 490
-
- constexpr error_type const && error() const &&
- {
- return std::move( ( assert( ! has_value() ), contained.error() ) );
- }
-
- error_type && error() &&
- {
- return std::move( ( assert( ! has_value() ), contained.error() ) );
- }
-
-#endif
-
- constexpr unexpected_type get_unexpected() const
- {
- return make_unexpected( contained.error() );
- }
-
- template< typename Ex >
- bool has_exception() const
- {
- using ContainedEx = typename std::remove_reference< decltype( get_unexpected().value() ) >::type;
- return ! has_value() && std::is_base_of< Ex, ContainedEx>::value;
- }
-
-// template constexpr 'see below' unwrap() const&;
-//
-// template 'see below' unwrap() &&;
-
- // factories
-
-// template< typename Ex, typename F>
-// expected<void,E> catch_exception(F&& f);
-//
-// template< typename F>
-// expected<decltype(func()), E> map(F&& func) ;
-//
-// template< typename F>
-// 'see below' bind(F&& func) ;
-//
-// template< typename F>
-// expected<void,E> catch_error(F&& f);
-//
-// template< typename F>
-// 'see below' then(F&& func);
-
-private:
- detail::storage_t
- <
- void
- , E
- , std::is_copy_constructible<E>::value
- , std::is_move_constructible<E>::value
- >
- contained;
-};
-
-// x.x.4.6 expected<>: comparison operators
-
-template< typename T1, typename E1, typename T2, typename E2 >
-constexpr bool operator==( expected<T1,E1> const & x, expected<T2,E2> const & y )
-{
- return bool(x) != bool(y) ? false : bool(x) == false ? x.error() == y.error() : *x == *y;
-}
-
-template< typename T1, typename E1, typename T2, typename E2 >
-constexpr bool operator!=( expected<T1,E1> const & x, expected<T2,E2> const & y )
-{
- return !(x == y);
-}
-
-template< typename E1, typename E2 >
-constexpr bool operator==( expected<void,E1> const & x, expected<void,E1> const & y )
-{
- return bool(x) != bool(y) ? false : bool(x) == false ? x.error() == y.error() : true;
-}
-
-#if nsel_P0323R <= 2
-
-template< typename T, typename E >
-constexpr bool operator<( expected<T,E> const & x, expected<T,E> const & y )
-{
- return (!y) ? false : (!x) ? true : *x < *y;
-}
-
-template< typename T, typename E >
-constexpr bool operator>( expected<T,E> const & x, expected<T,E> const & y )
-{
- return (y < x);
-}
-
-template< typename T, typename E >
-constexpr bool operator<=( expected<T,E> const & x, expected<T,E> const & y )
-{
- return !(y < x);
-}
-
-template< typename T, typename E >
-constexpr bool operator>=( expected<T,E> const & x, expected<T,E> const & y )
-{
- return !(x < y);
-}
-
-#endif
-
-// x.x.4.7 expected: comparison with T
-
-template< typename T1, typename E1, typename T2 >
-constexpr bool operator==( expected<T1,E1> const & x, T2 const & v )
-{
- return bool(x) ? *x == v : false;
-}
-
-template< typename T1, typename E1, typename T2 >
-constexpr bool operator==(T2 const & v, expected<T1,E1> const & x )
-{
- return bool(x) ? v == *x : false;
-}
-
-template< typename T1, typename E1, typename T2 >
-constexpr bool operator!=( expected<T1,E1> const & x, T2 const & v )
-{
- return bool(x) ? *x != v : true;
-}
-
-template< typename T1, typename E1, typename T2 >
-constexpr bool operator!=( T2 const & v, expected<T1,E1> const & x )
-{
- return bool(x) ? v != *x : true;
-}
-
-#if nsel_P0323R <= 2
-
-template< typename T, typename E >
-constexpr bool operator<( expected<T,E> const & x, T const & v )
-{
- return bool(x) ? *x < v : true;
-}
-
-template< typename T, typename E >
-constexpr bool operator<( T const & v, expected<T,E> const & x )
-{
- return bool(x) ? v < *x : false;
-}
-
-template< typename T, typename E >
-constexpr bool operator>( T const & v, expected<T,E> const & x )
-{
- return bool(x) ? *x < v : false;
-}
-
-template< typename T, typename E >
-constexpr bool operator>( expected<T,E> const & x, T const & v )
-{
- return bool(x) ? v < *x : false;
-}
-
-template< typename T, typename E >
-constexpr bool operator<=( T const & v, expected<T,E> const & x )
-{
- return bool(x) ? ! ( *x < v ) : false;
-}
-
-template< typename T, typename E >
-constexpr bool operator<=( expected<T,E> const & x, T const & v )
-{
- return bool(x) ? ! ( v < *x ) : true;
-}
-
-template< typename T, typename E >
-constexpr bool operator>=( expected<T,E> const & x, T const & v )
-{
- return bool(x) ? ! ( *x < v ) : false;
-}
-
-template< typename T, typename E >
-constexpr bool operator>=( T const & v, expected<T,E> const & x )
-{
- return bool(x) ? ! ( v < *x ) : true;
-}
-
-#endif // nsel_P0323R
-
-// x.x.4.8 expected: comparison with unexpected_type
-
-template< typename T1, typename E1 , typename E2 >
-constexpr bool operator==( expected<T1,E1> const & x, unexpected_type<E2> const & u )
-{
- return (!x) ? x.get_unexpected() == u : false;
-}
-
-template< typename T1, typename E1 , typename E2 >
-constexpr bool operator==( unexpected_type<E2> const & u, expected<T1,E1> const & x )
-{
- return ( x == u );
-}
-
-template< typename T1, typename E1 , typename E2 >
-constexpr bool operator!=( expected<T1,E1> const & x, unexpected_type<E2> const & u )
-{
- return ! ( x == u );
-}
-
-template< typename T1, typename E1 , typename E2 >
-constexpr bool operator!=( unexpected_type<E2> const & u, expected<T1,E1> const & x )
-{
- return ! ( x == u );
-}
-
-#if nsel_P0323R <= 2
-
-template< typename T, typename E >
-constexpr bool operator<( expected<T,E> const & x, unexpected_type<E> const & u )
-{
- return (!x) ? ( x.get_unexpected() < u ) : false;
-}
-
-template< typename T, typename E >
-constexpr bool operator<( unexpected_type<E> const & u, expected<T,E> const & x )
-{
- return (!x) ? ( u < x.get_unexpected() ) : true ;
-}
-
-template< typename T, typename E >
-constexpr bool operator>( expected<T,E> const & x, unexpected_type<E> const & u )
-{
- return ( u < x );
-}
-
-template< typename T, typename E >
-constexpr bool operator>( unexpected_type<E> const & u, expected<T,E> const & x )
-{
- return ( x < u );
-}
-
-template< typename T, typename E >
-constexpr bool operator<=( expected<T,E> const & x, unexpected_type<E> const & u )
-{
- return ! ( u < x );
-}
-
-template< typename T, typename E >
-constexpr bool operator<=( unexpected_type<E> const & u, expected<T,E> const & x)
-{
- return ! ( x < u );
-}
-
-template< typename T, typename E >
-constexpr bool operator>=( expected<T,E> const & x, unexpected_type<E> const & u )
-{
- return ! ( u > x );
-}
-
-template< typename T, typename E >
-constexpr bool operator>=( unexpected_type<E> const & u, expected<T,E> const & x )
-{
- return ! ( x > u );
-}
-
-#endif // nsel_P0323R
-
-/// x.x.x Specialized algorithms
-
-template< typename T, typename E
- nsel_REQUIRES_T(
- ( std::is_void<T>::value || std::is_move_constructible<T>::value )
- && std::is_move_constructible<E>::value
- && std17::is_swappable<T>::value
- && std17::is_swappable<E>::value )
->
-void swap( expected<T,E> & x, expected<T,E> & y ) noexcept ( noexcept ( x.swap(y) ) )
-{
- x.swap( y );
-}
-
-#if nsel_P0323R <= 3
-
-template< typename T >
-constexpr auto make_expected( T && v ) -> expected< typename std::decay<T>::type >
-{
- return expected< typename std::decay<T>::type >( std::forward<T>( v ) );
-}
-
-// expected<void> specialization:
-
-auto inline make_expected() -> expected<void>
-{
- return expected<void>( in_place );
-}
-
-template< typename T >
-constexpr auto make_expected_from_current_exception() -> expected<T>
-{
- return expected<T>( make_unexpected_from_current_exception() );
-}
-
-template< typename T >
-auto make_expected_from_exception( std::exception_ptr v ) -> expected<T>
-{
- return expected<T>( unexpected_type<std::exception_ptr>( std::forward<std::exception_ptr>( v ) ) );
-}
-
-template< typename T, typename E >
-constexpr auto make_expected_from_error( E e ) -> expected<T, typename std::decay<E>::type>
-{
- return expected<T, typename std::decay<E>::type>( make_unexpected( e ) );
-}
-
-template< typename F
- nsel_REQUIRES_T( ! std::is_same<typename std::result_of<F()>::type, void>::value )
->
-/*nsel_constexpr14*/
-auto make_expected_from_call( F f ) -> expected< typename std::result_of<F()>::type >
-{
- try
- {
- return make_expected( f() );
- }
- catch (...)
- {
- return make_unexpected_from_current_exception();
- }
-}
-
-template< typename F
- nsel_REQUIRES_T( std::is_same<typename std::result_of<F()>::type, void>::value )
->
-/*nsel_constexpr14*/
-auto make_expected_from_call( F f ) -> expected<void>
-{
- try
- {
- f();
- return make_expected();
- }
- catch (...)
- {
- return make_unexpected_from_current_exception();
- }
-}
-
-#endif // nsel_P0323R
-
-} // namespace expected_lite
-
-using namespace expected_lite;
-
-// using expected_lite::expected;
-// using ...
-
-} // namespace nonstd
-
-namespace std {
-
-// expected: hash support
-
-template< typename T, typename E >
-struct hash< nonstd::expected<T,E> >
-{
- using result_type = std::size_t;
- using argument_type = nonstd::expected<T,E>;
-
- constexpr result_type operator()(argument_type const & arg) const
- {
- return arg ? std::hash<T>{}(*arg) : result_type{};
- }
-};
-
-// TBD - ?? remove? see spec.
-template< typename T, typename E >
-struct hash< nonstd::expected<T&,E> >
-{
- using result_type = std::size_t;
- using argument_type = nonstd::expected<T&,E>;
-
- constexpr result_type operator()(argument_type const & arg) const
- {
- return arg ? std::hash<T>{}(*arg) : result_type{};
- }
-};
-
-// TBD - implement
-// bool(e), hash<expected<void,E>>()(e) shall evaluate to the hashing true;
-// otherwise it evaluates to an unspecified value if E is exception_ptr or
-// a combination of hashing false and hash<E>()(e.error()).
-
-template< typename E >
-struct hash< nonstd::expected<void,E> >
-{
-};
-
-} // namespace std
-
-namespace nonstd {
-
-// void unexpected() is deprecated && removed in C++17
-
-#if nsel_CPP17_OR_GREATER || nsel_COMPILER_MSVC_VERSION > 141
-template< typename E >
-using unexpected = unexpected_type<E>;
-#endif
-
-} // namespace nonstd
-
-#undef nsel_REQUIRES
-#undef nsel_REQUIRES_0
-#undef nsel_REQUIRES_T
-
-nsel_RESTORE_WARNINGS()
-
-#endif // nsel_USES_STD_EXPECTED
-
-#endif // NONSTD_EXPECTED_LITE_HPP
--- /dev/null
+///
+// expected - An implementation of std::expected with extensions
+// Written in 2017 by Sy Brand (tartanllama@gmail.com, @TartanLlama)
+//
+// Documentation available at http://tl.tartanllama.xyz/
+//
+// To the extent possible under law, the author(s) have dedicated all
+// copyright and related and neighboring rights to this software to the
+// public domain worldwide. This software is distributed without any warranty.
+//
+// You should have received a copy of the CC0 Public Domain Dedication
+// along with this software. If not, see
+// <http://creativecommons.org/publicdomain/zero/1.0/>.
+///
+
+#ifndef TL_EXPECTED_HPP
+#define TL_EXPECTED_HPP
+
+#define TL_EXPECTED_VERSION_MAJOR 1
+#define TL_EXPECTED_VERSION_MINOR 1
+#define TL_EXPECTED_VERSION_PATCH 0
+
+#include <exception>
+#include <functional>
+#include <type_traits>
+#include <utility>
+
+#if defined(__EXCEPTIONS) || defined(_CPPUNWIND)
+#define TL_EXPECTED_EXCEPTIONS_ENABLED
+#endif
+
+#if (defined(_MSC_VER) && _MSC_VER == 1900)
+#define TL_EXPECTED_MSVC2015
+#define TL_EXPECTED_MSVC2015_CONSTEXPR
+#else
+#define TL_EXPECTED_MSVC2015_CONSTEXPR constexpr
+#endif
+
+#if (defined(__GNUC__) && __GNUC__ == 4 && __GNUC_MINOR__ <= 9 && \
+ !defined(__clang__))
+#define TL_EXPECTED_GCC49
+#endif
+
+#if (defined(__GNUC__) && __GNUC__ == 5 && __GNUC_MINOR__ <= 4 && \
+ !defined(__clang__))
+#define TL_EXPECTED_GCC54
+#endif
+
+#if (defined(__GNUC__) && __GNUC__ == 5 && __GNUC_MINOR__ <= 5 && \
+ !defined(__clang__))
+#define TL_EXPECTED_GCC55
+#endif
+
+#if !defined(TL_ASSERT)
+//can't have assert in constexpr in C++11 and GCC 4.9 has a compiler bug
+#if (__cplusplus > 201103L) && !defined(TL_EXPECTED_GCC49)
+#include <cassert>
+#define TL_ASSERT(x) assert(x)
+#else
+#define TL_ASSERT(x)
+#endif
+#endif
+
+#if (defined(__GNUC__) && __GNUC__ == 4 && __GNUC_MINOR__ <= 9 && \
+ !defined(__clang__))
+// GCC < 5 doesn't support overloading on const&& for member functions
+
+#define TL_EXPECTED_NO_CONSTRR
+// GCC < 5 doesn't support some standard C++11 type traits
+#define TL_EXPECTED_IS_TRIVIALLY_COPY_CONSTRUCTIBLE(T) \
+ std::has_trivial_copy_constructor<T>
+#define TL_EXPECTED_IS_TRIVIALLY_COPY_ASSIGNABLE(T) \
+ std::has_trivial_copy_assign<T>
+
+// This one will be different for GCC 5.7 if it's ever supported
+#define TL_EXPECTED_IS_TRIVIALLY_DESTRUCTIBLE(T) \
+ std::is_trivially_destructible<T>
+
+// GCC 5 < v < 8 has a bug in is_trivially_copy_constructible which breaks
+// std::vector for non-copyable types
+#elif (defined(__GNUC__) && __GNUC__ < 8 && !defined(__clang__))
+#ifndef TL_GCC_LESS_8_TRIVIALLY_COPY_CONSTRUCTIBLE_MUTEX
+#define TL_GCC_LESS_8_TRIVIALLY_COPY_CONSTRUCTIBLE_MUTEX
+namespace tl {
+namespace detail {
+template <class T>
+struct is_trivially_copy_constructible
+ : std::is_trivially_copy_constructible<T> {};
+#ifdef _GLIBCXX_VECTOR
+template <class T, class A>
+struct is_trivially_copy_constructible<std::vector<T, A>> : std::false_type {};
+#endif
+} // namespace detail
+} // namespace tl
+#endif
+
+#define TL_EXPECTED_IS_TRIVIALLY_COPY_CONSTRUCTIBLE(T) \
+ tl::detail::is_trivially_copy_constructible<T>
+#define TL_EXPECTED_IS_TRIVIALLY_COPY_ASSIGNABLE(T) \
+ std::is_trivially_copy_assignable<T>
+#define TL_EXPECTED_IS_TRIVIALLY_DESTRUCTIBLE(T) \
+ std::is_trivially_destructible<T>
+#else
+#define TL_EXPECTED_IS_TRIVIALLY_COPY_CONSTRUCTIBLE(T) \
+ std::is_trivially_copy_constructible<T>
+#define TL_EXPECTED_IS_TRIVIALLY_COPY_ASSIGNABLE(T) \
+ std::is_trivially_copy_assignable<T>
+#define TL_EXPECTED_IS_TRIVIALLY_DESTRUCTIBLE(T) \
+ std::is_trivially_destructible<T>
+#endif
+
+#if __cplusplus > 201103L
+#define TL_EXPECTED_CXX14
+#endif
+
+#ifdef TL_EXPECTED_GCC49
+#define TL_EXPECTED_GCC49_CONSTEXPR
+#else
+#define TL_EXPECTED_GCC49_CONSTEXPR constexpr
+#endif
+
+#if (__cplusplus == 201103L || defined(TL_EXPECTED_MSVC2015) || \
+ defined(TL_EXPECTED_GCC49))
+#define TL_EXPECTED_11_CONSTEXPR
+#else
+#define TL_EXPECTED_11_CONSTEXPR constexpr
+#endif
+
+namespace tl {
+template <class T, class E> class expected;
+
+#ifndef TL_MONOSTATE_INPLACE_MUTEX
+#define TL_MONOSTATE_INPLACE_MUTEX
+class monostate {};
+
+struct in_place_t {
+ explicit in_place_t() = default;
+};
+static constexpr in_place_t in_place{};
+#endif
+
+template <class E> class unexpected {
+public:
+ static_assert(!std::is_same<E, void>::value, "E must not be void");
+
+ unexpected() = delete;
+ constexpr explicit unexpected(const E &e) : m_val(e) {}
+
+ constexpr explicit unexpected(E &&e) : m_val(std::move(e)) {}
+
+ template <class... Args, typename std::enable_if<std::is_constructible<
+ E, Args &&...>::value>::type * = nullptr>
+ constexpr explicit unexpected(Args &&...args)
+ : m_val(std::forward<Args>(args)...) {}
+ template <
+ class U, class... Args,
+ typename std::enable_if<std::is_constructible<
+ E, std::initializer_list<U> &, Args &&...>::value>::type * = nullptr>
+ constexpr explicit unexpected(std::initializer_list<U> l, Args &&...args)
+ : m_val(l, std::forward<Args>(args)...) {}
+
+ constexpr const E &value() const & { return m_val; }
+ TL_EXPECTED_11_CONSTEXPR E &value() & { return m_val; }
+ TL_EXPECTED_11_CONSTEXPR E &&value() && { return std::move(m_val); }
+ constexpr const E &&value() const && { return std::move(m_val); }
+
+private:
+ E m_val;
+};
+
+#ifdef __cpp_deduction_guides
+template <class E> unexpected(E) -> unexpected<E>;
+#endif
+
+template <class E>
+constexpr bool operator==(const unexpected<E> &lhs, const unexpected<E> &rhs) {
+ return lhs.value() == rhs.value();
+}
+template <class E>
+constexpr bool operator!=(const unexpected<E> &lhs, const unexpected<E> &rhs) {
+ return lhs.value() != rhs.value();
+}
+template <class E>
+constexpr bool operator<(const unexpected<E> &lhs, const unexpected<E> &rhs) {
+ return lhs.value() < rhs.value();
+}
+template <class E>
+constexpr bool operator<=(const unexpected<E> &lhs, const unexpected<E> &rhs) {
+ return lhs.value() <= rhs.value();
+}
+template <class E>
+constexpr bool operator>(const unexpected<E> &lhs, const unexpected<E> &rhs) {
+ return lhs.value() > rhs.value();
+}
+template <class E>
+constexpr bool operator>=(const unexpected<E> &lhs, const unexpected<E> &rhs) {
+ return lhs.value() >= rhs.value();
+}
+
+template <class E>
+unexpected<typename std::decay<E>::type> make_unexpected(E &&e) {
+ return unexpected<typename std::decay<E>::type>(std::forward<E>(e));
+}
+
+struct unexpect_t {
+ unexpect_t() = default;
+};
+static constexpr unexpect_t unexpect{};
+
+namespace detail {
+template <typename E>
+[[noreturn]] TL_EXPECTED_11_CONSTEXPR void throw_exception(E &&e) {
+#ifdef TL_EXPECTED_EXCEPTIONS_ENABLED
+ throw std::forward<E>(e);
+#else
+ (void)e;
+#ifdef _MSC_VER
+ __assume(0);
+#else
+ __builtin_unreachable();
+#endif
+#endif
+}
+
+#ifndef TL_TRAITS_MUTEX
+#define TL_TRAITS_MUTEX
+// C++14-style aliases for brevity
+template <class T> using remove_const_t = typename std::remove_const<T>::type;
+template <class T>
+using remove_reference_t = typename std::remove_reference<T>::type;
+template <class T> using decay_t = typename std::decay<T>::type;
+template <bool E, class T = void>
+using enable_if_t = typename std::enable_if<E, T>::type;
+template <bool B, class T, class F>
+using conditional_t = typename std::conditional<B, T, F>::type;
+
+// std::conjunction from C++17
+template <class...> struct conjunction : std::true_type {};
+template <class B> struct conjunction<B> : B {};
+template <class B, class... Bs>
+struct conjunction<B, Bs...>
+ : std::conditional<bool(B::value), conjunction<Bs...>, B>::type {};
+
+#if defined(_LIBCPP_VERSION) && __cplusplus == 201103L
+#define TL_TRAITS_LIBCXX_MEM_FN_WORKAROUND
+#endif
+
+// In C++11 mode, there's an issue in libc++'s std::mem_fn
+// which results in a hard-error when using it in a noexcept expression
+// in some cases. This is a check to workaround the common failing case.
+#ifdef TL_TRAITS_LIBCXX_MEM_FN_WORKAROUND
+template <class T>
+struct is_pointer_to_non_const_member_func : std::false_type {};
+template <class T, class Ret, class... Args>
+struct is_pointer_to_non_const_member_func<Ret (T::*)(Args...)>
+ : std::true_type {};
+template <class T, class Ret, class... Args>
+struct is_pointer_to_non_const_member_func<Ret (T::*)(Args...) &>
+ : std::true_type {};
+template <class T, class Ret, class... Args>
+struct is_pointer_to_non_const_member_func<Ret (T::*)(Args...) &&>
+ : std::true_type {};
+template <class T, class Ret, class... Args>
+struct is_pointer_to_non_const_member_func<Ret (T::*)(Args...) volatile>
+ : std::true_type {};
+template <class T, class Ret, class... Args>
+struct is_pointer_to_non_const_member_func<Ret (T::*)(Args...) volatile &>
+ : std::true_type {};
+template <class T, class Ret, class... Args>
+struct is_pointer_to_non_const_member_func<Ret (T::*)(Args...) volatile &&>
+ : std::true_type {};
+
+template <class T> struct is_const_or_const_ref : std::false_type {};
+template <class T> struct is_const_or_const_ref<T const &> : std::true_type {};
+template <class T> struct is_const_or_const_ref<T const> : std::true_type {};
+#endif
+
+// std::invoke from C++17
+// https://stackoverflow.com/questions/38288042/c11-14-invoke-workaround
+template <
+ typename Fn, typename... Args,
+#ifdef TL_TRAITS_LIBCXX_MEM_FN_WORKAROUND
+ typename = enable_if_t<!(is_pointer_to_non_const_member_func<Fn>::value &&
+ is_const_or_const_ref<Args...>::value)>,
+#endif
+ typename = enable_if_t<std::is_member_pointer<decay_t<Fn>>::value>, int = 0>
+constexpr auto invoke(Fn &&f, Args &&...args) noexcept(
+ noexcept(std::mem_fn(f)(std::forward<Args>(args)...)))
+ -> decltype(std::mem_fn(f)(std::forward<Args>(args)...)) {
+ return std::mem_fn(f)(std::forward<Args>(args)...);
+}
+
+template <typename Fn, typename... Args,
+ typename = enable_if_t<!std::is_member_pointer<decay_t<Fn>>::value>>
+constexpr auto invoke(Fn &&f, Args &&...args) noexcept(
+ noexcept(std::forward<Fn>(f)(std::forward<Args>(args)...)))
+ -> decltype(std::forward<Fn>(f)(std::forward<Args>(args)...)) {
+ return std::forward<Fn>(f)(std::forward<Args>(args)...);
+}
+
+// std::invoke_result from C++17
+template <class F, class, class... Us> struct invoke_result_impl;
+
+template <class F, class... Us>
+struct invoke_result_impl<
+ F,
+ decltype(detail::invoke(std::declval<F>(), std::declval<Us>()...), void()),
+ Us...> {
+ using type =
+ decltype(detail::invoke(std::declval<F>(), std::declval<Us>()...));
+};
+
+template <class F, class... Us>
+using invoke_result = invoke_result_impl<F, void, Us...>;
+
+template <class F, class... Us>
+using invoke_result_t = typename invoke_result<F, Us...>::type;
+
+#if defined(_MSC_VER) && _MSC_VER <= 1900
+// TODO make a version which works with MSVC 2015
+template <class T, class U = T> struct is_swappable : std::true_type {};
+
+template <class T, class U = T> struct is_nothrow_swappable : std::true_type {};
+#else
+// https://stackoverflow.com/questions/26744589/what-is-a-proper-way-to-implement-is-swappable-to-test-for-the-swappable-concept
+namespace swap_adl_tests {
+// if swap ADL finds this then it would call std::swap otherwise (same
+// signature)
+struct tag {};
+
+template <class T> tag swap(T &, T &);
+template <class T, std::size_t N> tag swap(T (&a)[N], T (&b)[N]);
+
+// helper functions to test if an unqualified swap is possible, and if it
+// becomes std::swap
+template <class, class> std::false_type can_swap(...) noexcept(false);
+template <class T, class U,
+ class = decltype(swap(std::declval<T &>(), std::declval<U &>()))>
+std::true_type can_swap(int) noexcept(noexcept(swap(std::declval<T &>(),
+ std::declval<U &>())));
+
+template <class, class> std::false_type uses_std(...);
+template <class T, class U>
+std::is_same<decltype(swap(std::declval<T &>(), std::declval<U &>())), tag>
+uses_std(int);
+
+template <class T>
+struct is_std_swap_noexcept
+ : std::integral_constant<bool,
+ std::is_nothrow_move_constructible<T>::value &&
+ std::is_nothrow_move_assignable<T>::value> {};
+
+template <class T, std::size_t N>
+struct is_std_swap_noexcept<T[N]> : is_std_swap_noexcept<T> {};
+
+template <class T, class U>
+struct is_adl_swap_noexcept
+ : std::integral_constant<bool, noexcept(can_swap<T, U>(0))> {};
+} // namespace swap_adl_tests
+
+template <class T, class U = T>
+struct is_swappable
+ : std::integral_constant<
+ bool,
+ decltype(detail::swap_adl_tests::can_swap<T, U>(0))::value &&
+ (!decltype(detail::swap_adl_tests::uses_std<T, U>(0))::value ||
+ (std::is_move_assignable<T>::value &&
+ std::is_move_constructible<T>::value))> {};
+
+template <class T, std::size_t N>
+struct is_swappable<T[N], T[N]>
+ : std::integral_constant<
+ bool,
+ decltype(detail::swap_adl_tests::can_swap<T[N], T[N]>(0))::value &&
+ (!decltype(detail::swap_adl_tests::uses_std<T[N], T[N]>(
+ 0))::value ||
+ is_swappable<T, T>::value)> {};
+
+template <class T, class U = T>
+struct is_nothrow_swappable
+ : std::integral_constant<
+ bool,
+ is_swappable<T, U>::value &&
+ ((decltype(detail::swap_adl_tests::uses_std<T, U>(0))::value &&
+ detail::swap_adl_tests::is_std_swap_noexcept<T>::value) ||
+ (!decltype(detail::swap_adl_tests::uses_std<T, U>(0))::value &&
+ detail::swap_adl_tests::is_adl_swap_noexcept<T, U>::value))> {};
+#endif
+#endif
+
+// Trait for checking if a type is a tl::expected
+template <class T> struct is_expected_impl : std::false_type {};
+template <class T, class E>
+struct is_expected_impl<expected<T, E>> : std::true_type {};
+template <class T> using is_expected = is_expected_impl<decay_t<T>>;
+
+template <class T, class E, class U>
+using expected_enable_forward_value = detail::enable_if_t<
+ std::is_constructible<T, U &&>::value &&
+ !std::is_same<detail::decay_t<U>, in_place_t>::value &&
+ !std::is_same<expected<T, E>, detail::decay_t<U>>::value &&
+ !std::is_same<unexpected<E>, detail::decay_t<U>>::value>;
+
+template <class T, class E, class U, class G, class UR, class GR>
+using expected_enable_from_other = detail::enable_if_t<
+ std::is_constructible<T, UR>::value &&
+ std::is_constructible<E, GR>::value &&
+ !std::is_constructible<T, expected<U, G> &>::value &&
+ !std::is_constructible<T, expected<U, G> &&>::value &&
+ !std::is_constructible<T, const expected<U, G> &>::value &&
+ !std::is_constructible<T, const expected<U, G> &&>::value &&
+ !std::is_convertible<expected<U, G> &, T>::value &&
+ !std::is_convertible<expected<U, G> &&, T>::value &&
+ !std::is_convertible<const expected<U, G> &, T>::value &&
+ !std::is_convertible<const expected<U, G> &&, T>::value>;
+
+template <class T, class U>
+using is_void_or = conditional_t<std::is_void<T>::value, std::true_type, U>;
+
+template <class T>
+using is_copy_constructible_or_void =
+ is_void_or<T, std::is_copy_constructible<T>>;
+
+template <class T>
+using is_move_constructible_or_void =
+ is_void_or<T, std::is_move_constructible<T>>;
+
+template <class T>
+using is_copy_assignable_or_void = is_void_or<T, std::is_copy_assignable<T>>;
+
+template <class T>
+using is_move_assignable_or_void = is_void_or<T, std::is_move_assignable<T>>;
+
+} // namespace detail
+
+namespace detail {
+struct no_init_t {};
+static constexpr no_init_t no_init{};
+
+// Implements the storage of the values, and ensures that the destructor is
+// trivial if it can be.
+//
+// This specialization is for where neither `T` or `E` is trivially
+// destructible, so the destructors must be called on destruction of the
+// `expected`
+template <class T, class E, bool = std::is_trivially_destructible<T>::value,
+ bool = std::is_trivially_destructible<E>::value>
+struct expected_storage_base {
+ constexpr expected_storage_base() : m_val(T{}), m_has_val(true) {}
+ constexpr expected_storage_base(no_init_t) : m_no_init(), m_has_val(false) {}
+
+ template <class... Args,
+ detail::enable_if_t<std::is_constructible<T, Args &&...>::value> * =
+ nullptr>
+ constexpr expected_storage_base(in_place_t, Args &&...args)
+ : m_val(std::forward<Args>(args)...), m_has_val(true) {}
+
+ template <class U, class... Args,
+ detail::enable_if_t<std::is_constructible<
+ T, std::initializer_list<U> &, Args &&...>::value> * = nullptr>
+ constexpr expected_storage_base(in_place_t, std::initializer_list<U> il,
+ Args &&...args)
+ : m_val(il, std::forward<Args>(args)...), m_has_val(true) {}
+ template <class... Args,
+ detail::enable_if_t<std::is_constructible<E, Args &&...>::value> * =
+ nullptr>
+ constexpr explicit expected_storage_base(unexpect_t, Args &&...args)
+ : m_unexpect(std::forward<Args>(args)...), m_has_val(false) {}
+
+ template <class U, class... Args,
+ detail::enable_if_t<std::is_constructible<
+ E, std::initializer_list<U> &, Args &&...>::value> * = nullptr>
+ constexpr explicit expected_storage_base(unexpect_t,
+ std::initializer_list<U> il,
+ Args &&...args)
+ : m_unexpect(il, std::forward<Args>(args)...), m_has_val(false) {}
+
+ ~expected_storage_base() {
+ if (m_has_val) {
+ m_val.~T();
+ } else {
+ m_unexpect.~unexpected<E>();
+ }
+ }
+ union {
+ T m_val;
+ unexpected<E> m_unexpect;
+ char m_no_init;
+ };
+ bool m_has_val;
+};
+
+// This specialization is for when both `T` and `E` are trivially-destructible,
+// so the destructor of the `expected` can be trivial.
+template <class T, class E> struct expected_storage_base<T, E, true, true> {
+ constexpr expected_storage_base() : m_val(T{}), m_has_val(true) {}
+ constexpr expected_storage_base(no_init_t) : m_no_init(), m_has_val(false) {}
+
+ template <class... Args,
+ detail::enable_if_t<std::is_constructible<T, Args &&...>::value> * =
+ nullptr>
+ constexpr expected_storage_base(in_place_t, Args &&...args)
+ : m_val(std::forward<Args>(args)...), m_has_val(true) {}
+
+ template <class U, class... Args,
+ detail::enable_if_t<std::is_constructible<
+ T, std::initializer_list<U> &, Args &&...>::value> * = nullptr>
+ constexpr expected_storage_base(in_place_t, std::initializer_list<U> il,
+ Args &&...args)
+ : m_val(il, std::forward<Args>(args)...), m_has_val(true) {}
+ template <class... Args,
+ detail::enable_if_t<std::is_constructible<E, Args &&...>::value> * =
+ nullptr>
+ constexpr explicit expected_storage_base(unexpect_t, Args &&...args)
+ : m_unexpect(std::forward<Args>(args)...), m_has_val(false) {}
+
+ template <class U, class... Args,
+ detail::enable_if_t<std::is_constructible<
+ E, std::initializer_list<U> &, Args &&...>::value> * = nullptr>
+ constexpr explicit expected_storage_base(unexpect_t,
+ std::initializer_list<U> il,
+ Args &&...args)
+ : m_unexpect(il, std::forward<Args>(args)...), m_has_val(false) {}
+
+ ~expected_storage_base() = default;
+ union {
+ T m_val;
+ unexpected<E> m_unexpect;
+ char m_no_init;
+ };
+ bool m_has_val;
+};
+
+// T is trivial, E is not.
+template <class T, class E> struct expected_storage_base<T, E, true, false> {
+ constexpr expected_storage_base() : m_val(T{}), m_has_val(true) {}
+ TL_EXPECTED_MSVC2015_CONSTEXPR expected_storage_base(no_init_t)
+ : m_no_init(), m_has_val(false) {}
+
+ template <class... Args,
+ detail::enable_if_t<std::is_constructible<T, Args &&...>::value> * =
+ nullptr>
+ constexpr expected_storage_base(in_place_t, Args &&...args)
+ : m_val(std::forward<Args>(args)...), m_has_val(true) {}
+
+ template <class U, class... Args,
+ detail::enable_if_t<std::is_constructible<
+ T, std::initializer_list<U> &, Args &&...>::value> * = nullptr>
+ constexpr expected_storage_base(in_place_t, std::initializer_list<U> il,
+ Args &&...args)
+ : m_val(il, std::forward<Args>(args)...), m_has_val(true) {}
+ template <class... Args,
+ detail::enable_if_t<std::is_constructible<E, Args &&...>::value> * =
+ nullptr>
+ constexpr explicit expected_storage_base(unexpect_t, Args &&...args)
+ : m_unexpect(std::forward<Args>(args)...), m_has_val(false) {}
+
+ template <class U, class... Args,
+ detail::enable_if_t<std::is_constructible<
+ E, std::initializer_list<U> &, Args &&...>::value> * = nullptr>
+ constexpr explicit expected_storage_base(unexpect_t,
+ std::initializer_list<U> il,
+ Args &&...args)
+ : m_unexpect(il, std::forward<Args>(args)...), m_has_val(false) {}
+
+ ~expected_storage_base() {
+ if (!m_has_val) {
+ m_unexpect.~unexpected<E>();
+ }
+ }
+
+ union {
+ T m_val;
+ unexpected<E> m_unexpect;
+ char m_no_init;
+ };
+ bool m_has_val;
+};
+
+// E is trivial, T is not.
+template <class T, class E> struct expected_storage_base<T, E, false, true> {
+ constexpr expected_storage_base() : m_val(T{}), m_has_val(true) {}
+ constexpr expected_storage_base(no_init_t) : m_no_init(), m_has_val(false) {}
+
+ template <class... Args,
+ detail::enable_if_t<std::is_constructible<T, Args &&...>::value> * =
+ nullptr>
+ constexpr expected_storage_base(in_place_t, Args &&...args)
+ : m_val(std::forward<Args>(args)...), m_has_val(true) {}
+
+ template <class U, class... Args,
+ detail::enable_if_t<std::is_constructible<
+ T, std::initializer_list<U> &, Args &&...>::value> * = nullptr>
+ constexpr expected_storage_base(in_place_t, std::initializer_list<U> il,
+ Args &&...args)
+ : m_val(il, std::forward<Args>(args)...), m_has_val(true) {}
+ template <class... Args,
+ detail::enable_if_t<std::is_constructible<E, Args &&...>::value> * =
+ nullptr>
+ constexpr explicit expected_storage_base(unexpect_t, Args &&...args)
+ : m_unexpect(std::forward<Args>(args)...), m_has_val(false) {}
+
+ template <class U, class... Args,
+ detail::enable_if_t<std::is_constructible<
+ E, std::initializer_list<U> &, Args &&...>::value> * = nullptr>
+ constexpr explicit expected_storage_base(unexpect_t,
+ std::initializer_list<U> il,
+ Args &&...args)
+ : m_unexpect(il, std::forward<Args>(args)...), m_has_val(false) {}
+
+ ~expected_storage_base() {
+ if (m_has_val) {
+ m_val.~T();
+ }
+ }
+ union {
+ T m_val;
+ unexpected<E> m_unexpect;
+ char m_no_init;
+ };
+ bool m_has_val;
+};
+
+// `T` is `void`, `E` is trivially-destructible
+template <class E> struct expected_storage_base<void, E, false, true> {
+ #if __GNUC__ <= 5
+ //no constexpr for GCC 4/5 bug
+ #else
+ TL_EXPECTED_MSVC2015_CONSTEXPR
+ #endif
+ expected_storage_base() : m_has_val(true) {}
+
+ constexpr expected_storage_base(no_init_t) : m_val(), m_has_val(false) {}
+
+ constexpr expected_storage_base(in_place_t) : m_has_val(true) {}
+
+ template <class... Args,
+ detail::enable_if_t<std::is_constructible<E, Args &&...>::value> * =
+ nullptr>
+ constexpr explicit expected_storage_base(unexpect_t, Args &&...args)
+ : m_unexpect(std::forward<Args>(args)...), m_has_val(false) {}
+
+ template <class U, class... Args,
+ detail::enable_if_t<std::is_constructible<
+ E, std::initializer_list<U> &, Args &&...>::value> * = nullptr>
+ constexpr explicit expected_storage_base(unexpect_t,
+ std::initializer_list<U> il,
+ Args &&...args)
+ : m_unexpect(il, std::forward<Args>(args)...), m_has_val(false) {}
+
+ ~expected_storage_base() = default;
+ struct dummy {};
+ union {
+ unexpected<E> m_unexpect;
+ dummy m_val;
+ };
+ bool m_has_val;
+};
+
+// `T` is `void`, `E` is not trivially-destructible
+template <class E> struct expected_storage_base<void, E, false, false> {
+ constexpr expected_storage_base() : m_dummy(), m_has_val(true) {}
+ constexpr expected_storage_base(no_init_t) : m_dummy(), m_has_val(false) {}
+
+ constexpr expected_storage_base(in_place_t) : m_dummy(), m_has_val(true) {}
+
+ template <class... Args,
+ detail::enable_if_t<std::is_constructible<E, Args &&...>::value> * =
+ nullptr>
+ constexpr explicit expected_storage_base(unexpect_t, Args &&...args)
+ : m_unexpect(std::forward<Args>(args)...), m_has_val(false) {}
+
+ template <class U, class... Args,
+ detail::enable_if_t<std::is_constructible<
+ E, std::initializer_list<U> &, Args &&...>::value> * = nullptr>
+ constexpr explicit expected_storage_base(unexpect_t,
+ std::initializer_list<U> il,
+ Args &&...args)
+ : m_unexpect(il, std::forward<Args>(args)...), m_has_val(false) {}
+
+ ~expected_storage_base() {
+ if (!m_has_val) {
+ m_unexpect.~unexpected<E>();
+ }
+ }
+
+ union {
+ unexpected<E> m_unexpect;
+ char m_dummy;
+ };
+ bool m_has_val;
+};
+
+// This base class provides some handy member functions which can be used in
+// further derived classes
+template <class T, class E>
+struct expected_operations_base : expected_storage_base<T, E> {
+ using expected_storage_base<T, E>::expected_storage_base;
+
+ template <class... Args> void construct(Args &&...args) noexcept {
+ new (std::addressof(this->m_val)) T(std::forward<Args>(args)...);
+ this->m_has_val = true;
+ }
+
+ template <class Rhs> void construct_with(Rhs &&rhs) noexcept {
+ new (std::addressof(this->m_val)) T(std::forward<Rhs>(rhs).get());
+ this->m_has_val = true;
+ }
+
+ template <class... Args> void construct_error(Args &&...args) noexcept {
+ new (std::addressof(this->m_unexpect))
+ unexpected<E>(std::forward<Args>(args)...);
+ this->m_has_val = false;
+ }
+
+#ifdef TL_EXPECTED_EXCEPTIONS_ENABLED
+
+ // These assign overloads ensure that the most efficient assignment
+ // implementation is used while maintaining the strong exception guarantee.
+ // The problematic case is where rhs has a value, but *this does not.
+ //
+ // This overload handles the case where we can just copy-construct `T`
+ // directly into place without throwing.
+ template <class U = T,
+ detail::enable_if_t<std::is_nothrow_copy_constructible<U>::value>
+ * = nullptr>
+ void assign(const expected_operations_base &rhs) noexcept {
+ if (!this->m_has_val && rhs.m_has_val) {
+ geterr().~unexpected<E>();
+ construct(rhs.get());
+ } else {
+ assign_common(rhs);
+ }
+ }
+
+ // This overload handles the case where we can attempt to create a copy of
+ // `T`, then no-throw move it into place if the copy was successful.
+ template <class U = T,
+ detail::enable_if_t<!std::is_nothrow_copy_constructible<U>::value &&
+ std::is_nothrow_move_constructible<U>::value>
+ * = nullptr>
+ void assign(const expected_operations_base &rhs) noexcept {
+ if (!this->m_has_val && rhs.m_has_val) {
+ T tmp = rhs.get();
+ geterr().~unexpected<E>();
+ construct(std::move(tmp));
+ } else {
+ assign_common(rhs);
+ }
+ }
+
+ // This overload is the worst-case, where we have to move-construct the
+ // unexpected value into temporary storage, then try to copy the T into place.
+ // If the construction succeeds, then everything is fine, but if it throws,
+ // then we move the old unexpected value back into place before rethrowing the
+ // exception.
+ template <class U = T,
+ detail::enable_if_t<!std::is_nothrow_copy_constructible<U>::value &&
+ !std::is_nothrow_move_constructible<U>::value>
+ * = nullptr>
+ void assign(const expected_operations_base &rhs) {
+ if (!this->m_has_val && rhs.m_has_val) {
+ auto tmp = std::move(geterr());
+ geterr().~unexpected<E>();
+
+#ifdef TL_EXPECTED_EXCEPTIONS_ENABLED
+ try {
+ construct(rhs.get());
+ } catch (...) {
+ geterr() = std::move(tmp);
+ throw;
+ }
+#else
+ construct(rhs.get());
+#endif
+ } else {
+ assign_common(rhs);
+ }
+ }
+
+ // These overloads do the same as above, but for rvalues
+ template <class U = T,
+ detail::enable_if_t<std::is_nothrow_move_constructible<U>::value>
+ * = nullptr>
+ void assign(expected_operations_base &&rhs) noexcept {
+ if (!this->m_has_val && rhs.m_has_val) {
+ geterr().~unexpected<E>();
+ construct(std::move(rhs).get());
+ } else {
+ assign_common(std::move(rhs));
+ }
+ }
+
+ template <class U = T,
+ detail::enable_if_t<!std::is_nothrow_move_constructible<U>::value>
+ * = nullptr>
+ void assign(expected_operations_base &&rhs) {
+ if (!this->m_has_val && rhs.m_has_val) {
+ auto tmp = std::move(geterr());
+ geterr().~unexpected<E>();
+#ifdef TL_EXPECTED_EXCEPTIONS_ENABLED
+ try {
+ construct(std::move(rhs).get());
+ } catch (...) {
+ geterr() = std::move(tmp);
+ throw;
+ }
+#else
+ construct(std::move(rhs).get());
+#endif
+ } else {
+ assign_common(std::move(rhs));
+ }
+ }
+
+#else
+
+ // If exceptions are disabled then we can just copy-construct
+ void assign(const expected_operations_base &rhs) noexcept {
+ if (!this->m_has_val && rhs.m_has_val) {
+ geterr().~unexpected<E>();
+ construct(rhs.get());
+ } else {
+ assign_common(rhs);
+ }
+ }
+
+ void assign(expected_operations_base &&rhs) noexcept {
+ if (!this->m_has_val && rhs.m_has_val) {
+ geterr().~unexpected<E>();
+ construct(std::move(rhs).get());
+ } else {
+ assign_common(std::move(rhs));
+ }
+ }
+
+#endif
+
+ // The common part of move/copy assigning
+ template <class Rhs> void assign_common(Rhs &&rhs) {
+ if (this->m_has_val) {
+ if (rhs.m_has_val) {
+ get() = std::forward<Rhs>(rhs).get();
+ } else {
+ destroy_val();
+ construct_error(std::forward<Rhs>(rhs).geterr());
+ }
+ } else {
+ if (!rhs.m_has_val) {
+ geterr() = std::forward<Rhs>(rhs).geterr();
+ }
+ }
+ }
+
+ bool has_value() const { return this->m_has_val; }
+
+ TL_EXPECTED_11_CONSTEXPR T &get() & { return this->m_val; }
+ constexpr const T &get() const & { return this->m_val; }
+ TL_EXPECTED_11_CONSTEXPR T &&get() && { return std::move(this->m_val); }
+#ifndef TL_EXPECTED_NO_CONSTRR
+ constexpr const T &&get() const && { return std::move(this->m_val); }
+#endif
+
+ TL_EXPECTED_11_CONSTEXPR unexpected<E> &geterr() & {
+ return this->m_unexpect;
+ }
+ constexpr const unexpected<E> &geterr() const & { return this->m_unexpect; }
+ TL_EXPECTED_11_CONSTEXPR unexpected<E> &&geterr() && {
+ return std::move(this->m_unexpect);
+ }
+#ifndef TL_EXPECTED_NO_CONSTRR
+ constexpr const unexpected<E> &&geterr() const && {
+ return std::move(this->m_unexpect);
+ }
+#endif
+
+ TL_EXPECTED_11_CONSTEXPR void destroy_val() { get().~T(); }
+};
+
+// This base class provides some handy member functions which can be used in
+// further derived classes
+template <class E>
+struct expected_operations_base<void, E> : expected_storage_base<void, E> {
+ using expected_storage_base<void, E>::expected_storage_base;
+
+ template <class... Args> void construct() noexcept { this->m_has_val = true; }
+
+ // This function doesn't use its argument, but needs it so that code in
+ // levels above this can work independently of whether T is void
+ template <class Rhs> void construct_with(Rhs &&) noexcept {
+ this->m_has_val = true;
+ }
+
+ template <class... Args> void construct_error(Args &&...args) noexcept {
+ new (std::addressof(this->m_unexpect))
+ unexpected<E>(std::forward<Args>(args)...);
+ this->m_has_val = false;
+ }
+
+ template <class Rhs> void assign(Rhs &&rhs) noexcept {
+ if (!this->m_has_val) {
+ if (rhs.m_has_val) {
+ geterr().~unexpected<E>();
+ construct();
+ } else {
+ geterr() = std::forward<Rhs>(rhs).geterr();
+ }
+ } else {
+ if (!rhs.m_has_val) {
+ construct_error(std::forward<Rhs>(rhs).geterr());
+ }
+ }
+ }
+
+ bool has_value() const { return this->m_has_val; }
+
+ TL_EXPECTED_11_CONSTEXPR unexpected<E> &geterr() & {
+ return this->m_unexpect;
+ }
+ constexpr const unexpected<E> &geterr() const & { return this->m_unexpect; }
+ TL_EXPECTED_11_CONSTEXPR unexpected<E> &&geterr() && {
+ return std::move(this->m_unexpect);
+ }
+#ifndef TL_EXPECTED_NO_CONSTRR
+ constexpr const unexpected<E> &&geterr() const && {
+ return std::move(this->m_unexpect);
+ }
+#endif
+
+ TL_EXPECTED_11_CONSTEXPR void destroy_val() {
+ // no-op
+ }
+};
+
+// This class manages conditionally having a trivial copy constructor
+// This specialization is for when T and E are trivially copy constructible
+template <class T, class E,
+ bool = is_void_or<T, TL_EXPECTED_IS_TRIVIALLY_COPY_CONSTRUCTIBLE(T)>::
+ value &&TL_EXPECTED_IS_TRIVIALLY_COPY_CONSTRUCTIBLE(E)::value>
+struct expected_copy_base : expected_operations_base<T, E> {
+ using expected_operations_base<T, E>::expected_operations_base;
+};
+
+// This specialization is for when T or E are not trivially copy constructible
+template <class T, class E>
+struct expected_copy_base<T, E, false> : expected_operations_base<T, E> {
+ using expected_operations_base<T, E>::expected_operations_base;
+
+ expected_copy_base() = default;
+ expected_copy_base(const expected_copy_base &rhs)
+ : expected_operations_base<T, E>(no_init) {
+ if (rhs.has_value()) {
+ this->construct_with(rhs);
+ } else {
+ this->construct_error(rhs.geterr());
+ }
+ }
+
+ expected_copy_base(expected_copy_base &&rhs) = default;
+ expected_copy_base &operator=(const expected_copy_base &rhs) = default;
+ expected_copy_base &operator=(expected_copy_base &&rhs) = default;
+};
+
+// This class manages conditionally having a trivial move constructor
+// Unfortunately there's no way to achieve this in GCC < 5 AFAIK, since it
+// doesn't implement an analogue to std::is_trivially_move_constructible. We
+// have to make do with a non-trivial move constructor even if T is trivially
+// move constructible
+#ifndef TL_EXPECTED_GCC49
+template <class T, class E,
+ bool = is_void_or<T, std::is_trivially_move_constructible<T>>::value
+ &&std::is_trivially_move_constructible<E>::value>
+struct expected_move_base : expected_copy_base<T, E> {
+ using expected_copy_base<T, E>::expected_copy_base;
+};
+#else
+template <class T, class E, bool = false> struct expected_move_base;
+#endif
+template <class T, class E>
+struct expected_move_base<T, E, false> : expected_copy_base<T, E> {
+ using expected_copy_base<T, E>::expected_copy_base;
+
+ expected_move_base() = default;
+ expected_move_base(const expected_move_base &rhs) = default;
+
+ expected_move_base(expected_move_base &&rhs) noexcept(
+ std::is_nothrow_move_constructible<T>::value)
+ : expected_copy_base<T, E>(no_init) {
+ if (rhs.has_value()) {
+ this->construct_with(std::move(rhs));
+ } else {
+ this->construct_error(std::move(rhs.geterr()));
+ }
+ }
+ expected_move_base &operator=(const expected_move_base &rhs) = default;
+ expected_move_base &operator=(expected_move_base &&rhs) = default;
+};
+
+// This class manages conditionally having a trivial copy assignment operator
+template <class T, class E,
+ bool = is_void_or<
+ T, conjunction<TL_EXPECTED_IS_TRIVIALLY_COPY_ASSIGNABLE(T),
+ TL_EXPECTED_IS_TRIVIALLY_COPY_CONSTRUCTIBLE(T),
+ TL_EXPECTED_IS_TRIVIALLY_DESTRUCTIBLE(T)>>::value
+ &&TL_EXPECTED_IS_TRIVIALLY_COPY_ASSIGNABLE(E)::value
+ &&TL_EXPECTED_IS_TRIVIALLY_COPY_CONSTRUCTIBLE(E)::value
+ &&TL_EXPECTED_IS_TRIVIALLY_DESTRUCTIBLE(E)::value>
+struct expected_copy_assign_base : expected_move_base<T, E> {
+ using expected_move_base<T, E>::expected_move_base;
+};
+
+template <class T, class E>
+struct expected_copy_assign_base<T, E, false> : expected_move_base<T, E> {
+ using expected_move_base<T, E>::expected_move_base;
+
+ expected_copy_assign_base() = default;
+ expected_copy_assign_base(const expected_copy_assign_base &rhs) = default;
+
+ expected_copy_assign_base(expected_copy_assign_base &&rhs) = default;
+ expected_copy_assign_base &operator=(const expected_copy_assign_base &rhs) {
+ this->assign(rhs);
+ return *this;
+ }
+ expected_copy_assign_base &
+ operator=(expected_copy_assign_base &&rhs) = default;
+};
+
+// This class manages conditionally having a trivial move assignment operator
+// Unfortunately there's no way to achieve this in GCC < 5 AFAIK, since it
+// doesn't implement an analogue to std::is_trivially_move_assignable. We have
+// to make do with a non-trivial move assignment operator even if T is trivially
+// move assignable
+#ifndef TL_EXPECTED_GCC49
+template <class T, class E,
+ bool =
+ is_void_or<T, conjunction<std::is_trivially_destructible<T>,
+ std::is_trivially_move_constructible<T>,
+ std::is_trivially_move_assignable<T>>>::
+ value &&std::is_trivially_destructible<E>::value
+ &&std::is_trivially_move_constructible<E>::value
+ &&std::is_trivially_move_assignable<E>::value>
+struct expected_move_assign_base : expected_copy_assign_base<T, E> {
+ using expected_copy_assign_base<T, E>::expected_copy_assign_base;
+};
+#else
+template <class T, class E, bool = false> struct expected_move_assign_base;
+#endif
+
+template <class T, class E>
+struct expected_move_assign_base<T, E, false>
+ : expected_copy_assign_base<T, E> {
+ using expected_copy_assign_base<T, E>::expected_copy_assign_base;
+
+ expected_move_assign_base() = default;
+ expected_move_assign_base(const expected_move_assign_base &rhs) = default;
+
+ expected_move_assign_base(expected_move_assign_base &&rhs) = default;
+
+ expected_move_assign_base &
+ operator=(const expected_move_assign_base &rhs) = default;
+
+ expected_move_assign_base &
+ operator=(expected_move_assign_base &&rhs) noexcept(
+ std::is_nothrow_move_constructible<T>::value
+ &&std::is_nothrow_move_assignable<T>::value) {
+ this->assign(std::move(rhs));
+ return *this;
+ }
+};
+
+// expected_delete_ctor_base will conditionally delete copy and move
+// constructors depending on whether T is copy/move constructible
+template <class T, class E,
+ bool EnableCopy = (is_copy_constructible_or_void<T>::value &&
+ std::is_copy_constructible<E>::value),
+ bool EnableMove = (is_move_constructible_or_void<T>::value &&
+ std::is_move_constructible<E>::value)>
+struct expected_delete_ctor_base {
+ expected_delete_ctor_base() = default;
+ expected_delete_ctor_base(const expected_delete_ctor_base &) = default;
+ expected_delete_ctor_base(expected_delete_ctor_base &&) noexcept = default;
+ expected_delete_ctor_base &
+ operator=(const expected_delete_ctor_base &) = default;
+ expected_delete_ctor_base &
+ operator=(expected_delete_ctor_base &&) noexcept = default;
+};
+
+template <class T, class E>
+struct expected_delete_ctor_base<T, E, true, false> {
+ expected_delete_ctor_base() = default;
+ expected_delete_ctor_base(const expected_delete_ctor_base &) = default;
+ expected_delete_ctor_base(expected_delete_ctor_base &&) noexcept = delete;
+ expected_delete_ctor_base &
+ operator=(const expected_delete_ctor_base &) = default;
+ expected_delete_ctor_base &
+ operator=(expected_delete_ctor_base &&) noexcept = default;
+};
+
+template <class T, class E>
+struct expected_delete_ctor_base<T, E, false, true> {
+ expected_delete_ctor_base() = default;
+ expected_delete_ctor_base(const expected_delete_ctor_base &) = delete;
+ expected_delete_ctor_base(expected_delete_ctor_base &&) noexcept = default;
+ expected_delete_ctor_base &
+ operator=(const expected_delete_ctor_base &) = default;
+ expected_delete_ctor_base &
+ operator=(expected_delete_ctor_base &&) noexcept = default;
+};
+
+template <class T, class E>
+struct expected_delete_ctor_base<T, E, false, false> {
+ expected_delete_ctor_base() = default;
+ expected_delete_ctor_base(const expected_delete_ctor_base &) = delete;
+ expected_delete_ctor_base(expected_delete_ctor_base &&) noexcept = delete;
+ expected_delete_ctor_base &
+ operator=(const expected_delete_ctor_base &) = default;
+ expected_delete_ctor_base &
+ operator=(expected_delete_ctor_base &&) noexcept = default;
+};
+
+// expected_delete_assign_base will conditionally delete copy and move
+// constructors depending on whether T and E are copy/move constructible +
+// assignable
+template <class T, class E,
+ bool EnableCopy = (is_copy_constructible_or_void<T>::value &&
+ std::is_copy_constructible<E>::value &&
+ is_copy_assignable_or_void<T>::value &&
+ std::is_copy_assignable<E>::value),
+ bool EnableMove = (is_move_constructible_or_void<T>::value &&
+ std::is_move_constructible<E>::value &&
+ is_move_assignable_or_void<T>::value &&
+ std::is_move_assignable<E>::value)>
+struct expected_delete_assign_base {
+ expected_delete_assign_base() = default;
+ expected_delete_assign_base(const expected_delete_assign_base &) = default;
+ expected_delete_assign_base(expected_delete_assign_base &&) noexcept =
+ default;
+ expected_delete_assign_base &
+ operator=(const expected_delete_assign_base &) = default;
+ expected_delete_assign_base &
+ operator=(expected_delete_assign_base &&) noexcept = default;
+};
+
+template <class T, class E>
+struct expected_delete_assign_base<T, E, true, false> {
+ expected_delete_assign_base() = default;
+ expected_delete_assign_base(const expected_delete_assign_base &) = default;
+ expected_delete_assign_base(expected_delete_assign_base &&) noexcept =
+ default;
+ expected_delete_assign_base &
+ operator=(const expected_delete_assign_base &) = default;
+ expected_delete_assign_base &
+ operator=(expected_delete_assign_base &&) noexcept = delete;
+};
+
+template <class T, class E>
+struct expected_delete_assign_base<T, E, false, true> {
+ expected_delete_assign_base() = default;
+ expected_delete_assign_base(const expected_delete_assign_base &) = default;
+ expected_delete_assign_base(expected_delete_assign_base &&) noexcept =
+ default;
+ expected_delete_assign_base &
+ operator=(const expected_delete_assign_base &) = delete;
+ expected_delete_assign_base &
+ operator=(expected_delete_assign_base &&) noexcept = default;
+};
+
+template <class T, class E>
+struct expected_delete_assign_base<T, E, false, false> {
+ expected_delete_assign_base() = default;
+ expected_delete_assign_base(const expected_delete_assign_base &) = default;
+ expected_delete_assign_base(expected_delete_assign_base &&) noexcept =
+ default;
+ expected_delete_assign_base &
+ operator=(const expected_delete_assign_base &) = delete;
+ expected_delete_assign_base &
+ operator=(expected_delete_assign_base &&) noexcept = delete;
+};
+
+// This is needed to be able to construct the expected_default_ctor_base which
+// follows, while still conditionally deleting the default constructor.
+struct default_constructor_tag {
+ explicit constexpr default_constructor_tag() = default;
+};
+
+// expected_default_ctor_base will ensure that expected has a deleted default
+// consturctor if T is not default constructible.
+// This specialization is for when T is default constructible
+template <class T, class E,
+ bool Enable =
+ std::is_default_constructible<T>::value || std::is_void<T>::value>
+struct expected_default_ctor_base {
+ constexpr expected_default_ctor_base() noexcept = default;
+ constexpr expected_default_ctor_base(
+ expected_default_ctor_base const &) noexcept = default;
+ constexpr expected_default_ctor_base(expected_default_ctor_base &&) noexcept =
+ default;
+ expected_default_ctor_base &
+ operator=(expected_default_ctor_base const &) noexcept = default;
+ expected_default_ctor_base &
+ operator=(expected_default_ctor_base &&) noexcept = default;
+
+ constexpr explicit expected_default_ctor_base(default_constructor_tag) {}
+};
+
+// This specialization is for when T is not default constructible
+template <class T, class E> struct expected_default_ctor_base<T, E, false> {
+ constexpr expected_default_ctor_base() noexcept = delete;
+ constexpr expected_default_ctor_base(
+ expected_default_ctor_base const &) noexcept = default;
+ constexpr expected_default_ctor_base(expected_default_ctor_base &&) noexcept =
+ default;
+ expected_default_ctor_base &
+ operator=(expected_default_ctor_base const &) noexcept = default;
+ expected_default_ctor_base &
+ operator=(expected_default_ctor_base &&) noexcept = default;
+
+ constexpr explicit expected_default_ctor_base(default_constructor_tag) {}
+};
+} // namespace detail
+
+template <class E> class bad_expected_access : public std::exception {
+public:
+ explicit bad_expected_access(E e) : m_val(std::move(e)) {}
+
+ virtual const char *what() const noexcept override {
+ return "Bad expected access";
+ }
+
+ const E &error() const & { return m_val; }
+ E &error() & { return m_val; }
+ const E &&error() const && { return std::move(m_val); }
+ E &&error() && { return std::move(m_val); }
+
+private:
+ E m_val;
+};
+
+/// An `expected<T, E>` object is an object that contains the storage for
+/// another object and manages the lifetime of this contained object `T`.
+/// Alternatively it could contain the storage for another unexpected object
+/// `E`. The contained object may not be initialized after the expected object
+/// has been initialized, and may not be destroyed before the expected object
+/// has been destroyed. The initialization state of the contained object is
+/// tracked by the expected object.
+template <class T, class E>
+class expected : private detail::expected_move_assign_base<T, E>,
+ private detail::expected_delete_ctor_base<T, E>,
+ private detail::expected_delete_assign_base<T, E>,
+ private detail::expected_default_ctor_base<T, E> {
+ static_assert(!std::is_reference<T>::value, "T must not be a reference");
+ static_assert(!std::is_same<T, std::remove_cv<in_place_t>::type>::value,
+ "T must not be in_place_t");
+ static_assert(!std::is_same<T, std::remove_cv<unexpect_t>::type>::value,
+ "T must not be unexpect_t");
+ static_assert(
+ !std::is_same<T, typename std::remove_cv<unexpected<E>>::type>::value,
+ "T must not be unexpected<E>");
+ static_assert(!std::is_reference<E>::value, "E must not be a reference");
+
+ T *valptr() { return std::addressof(this->m_val); }
+ const T *valptr() const { return std::addressof(this->m_val); }
+ unexpected<E> *errptr() { return std::addressof(this->m_unexpect); }
+ const unexpected<E> *errptr() const {
+ return std::addressof(this->m_unexpect);
+ }
+
+ template <class U = T,
+ detail::enable_if_t<!std::is_void<U>::value> * = nullptr>
+ TL_EXPECTED_11_CONSTEXPR U &val() {
+ return this->m_val;
+ }
+ TL_EXPECTED_11_CONSTEXPR unexpected<E> &err() { return this->m_unexpect; }
+
+ template <class U = T,
+ detail::enable_if_t<!std::is_void<U>::value> * = nullptr>
+ constexpr const U &val() const {
+ return this->m_val;
+ }
+ constexpr const unexpected<E> &err() const { return this->m_unexpect; }
+
+ using impl_base = detail::expected_move_assign_base<T, E>;
+ using ctor_base = detail::expected_default_ctor_base<T, E>;
+
+public:
+ typedef T value_type;
+ typedef E error_type;
+ typedef unexpected<E> unexpected_type;
+
+#if defined(TL_EXPECTED_CXX14) && !defined(TL_EXPECTED_GCC49) && \
+ !defined(TL_EXPECTED_GCC54) && !defined(TL_EXPECTED_GCC55)
+ template <class F> TL_EXPECTED_11_CONSTEXPR auto and_then(F &&f) & {
+ return and_then_impl(*this, std::forward<F>(f));
+ }
+ template <class F> TL_EXPECTED_11_CONSTEXPR auto and_then(F &&f) && {
+ return and_then_impl(std::move(*this), std::forward<F>(f));
+ }
+ template <class F> constexpr auto and_then(F &&f) const & {
+ return and_then_impl(*this, std::forward<F>(f));
+ }
+
+#ifndef TL_EXPECTED_NO_CONSTRR
+ template <class F> constexpr auto and_then(F &&f) const && {
+ return and_then_impl(std::move(*this), std::forward<F>(f));
+ }
+#endif
+
+#else
+ template <class F>
+ TL_EXPECTED_11_CONSTEXPR auto
+ and_then(F &&f) & -> decltype(and_then_impl(std::declval<expected &>(),
+ std::forward<F>(f))) {
+ return and_then_impl(*this, std::forward<F>(f));
+ }
+ template <class F>
+ TL_EXPECTED_11_CONSTEXPR auto
+ and_then(F &&f) && -> decltype(and_then_impl(std::declval<expected &&>(),
+ std::forward<F>(f))) {
+ return and_then_impl(std::move(*this), std::forward<F>(f));
+ }
+ template <class F>
+ constexpr auto and_then(F &&f) const & -> decltype(and_then_impl(
+ std::declval<expected const &>(), std::forward<F>(f))) {
+ return and_then_impl(*this, std::forward<F>(f));
+ }
+
+#ifndef TL_EXPECTED_NO_CONSTRR
+ template <class F>
+ constexpr auto and_then(F &&f) const && -> decltype(and_then_impl(
+ std::declval<expected const &&>(), std::forward<F>(f))) {
+ return and_then_impl(std::move(*this), std::forward<F>(f));
+ }
+#endif
+#endif
+
+#if defined(TL_EXPECTED_CXX14) && !defined(TL_EXPECTED_GCC49) && \
+ !defined(TL_EXPECTED_GCC54) && !defined(TL_EXPECTED_GCC55)
+ template <class F> TL_EXPECTED_11_CONSTEXPR auto map(F &&f) & {
+ return expected_map_impl(*this, std::forward<F>(f));
+ }
+ template <class F> TL_EXPECTED_11_CONSTEXPR auto map(F &&f) && {
+ return expected_map_impl(std::move(*this), std::forward<F>(f));
+ }
+ template <class F> constexpr auto map(F &&f) const & {
+ return expected_map_impl(*this, std::forward<F>(f));
+ }
+ template <class F> constexpr auto map(F &&f) const && {
+ return expected_map_impl(std::move(*this), std::forward<F>(f));
+ }
+#else
+ template <class F>
+ TL_EXPECTED_11_CONSTEXPR decltype(expected_map_impl(
+ std::declval<expected &>(), std::declval<F &&>()))
+ map(F &&f) & {
+ return expected_map_impl(*this, std::forward<F>(f));
+ }
+ template <class F>
+ TL_EXPECTED_11_CONSTEXPR decltype(expected_map_impl(std::declval<expected>(),
+ std::declval<F &&>()))
+ map(F &&f) && {
+ return expected_map_impl(std::move(*this), std::forward<F>(f));
+ }
+ template <class F>
+ constexpr decltype(expected_map_impl(std::declval<const expected &>(),
+ std::declval<F &&>()))
+ map(F &&f) const & {
+ return expected_map_impl(*this, std::forward<F>(f));
+ }
+
+#ifndef TL_EXPECTED_NO_CONSTRR
+ template <class F>
+ constexpr decltype(expected_map_impl(std::declval<const expected &&>(),
+ std::declval<F &&>()))
+ map(F &&f) const && {
+ return expected_map_impl(std::move(*this), std::forward<F>(f));
+ }
+#endif
+#endif
+
+#if defined(TL_EXPECTED_CXX14) && !defined(TL_EXPECTED_GCC49) && \
+ !defined(TL_EXPECTED_GCC54) && !defined(TL_EXPECTED_GCC55)
+ template <class F> TL_EXPECTED_11_CONSTEXPR auto transform(F &&f) & {
+ return expected_map_impl(*this, std::forward<F>(f));
+ }
+ template <class F> TL_EXPECTED_11_CONSTEXPR auto transform(F &&f) && {
+ return expected_map_impl(std::move(*this), std::forward<F>(f));
+ }
+ template <class F> constexpr auto transform(F &&f) const & {
+ return expected_map_impl(*this, std::forward<F>(f));
+ }
+ template <class F> constexpr auto transform(F &&f) const && {
+ return expected_map_impl(std::move(*this), std::forward<F>(f));
+ }
+#else
+ template <class F>
+ TL_EXPECTED_11_CONSTEXPR decltype(expected_map_impl(
+ std::declval<expected &>(), std::declval<F &&>()))
+ transform(F &&f) & {
+ return expected_map_impl(*this, std::forward<F>(f));
+ }
+ template <class F>
+ TL_EXPECTED_11_CONSTEXPR decltype(expected_map_impl(std::declval<expected>(),
+ std::declval<F &&>()))
+ transform(F &&f) && {
+ return expected_map_impl(std::move(*this), std::forward<F>(f));
+ }
+ template <class F>
+ constexpr decltype(expected_map_impl(std::declval<const expected &>(),
+ std::declval<F &&>()))
+ transform(F &&f) const & {
+ return expected_map_impl(*this, std::forward<F>(f));
+ }
+
+#ifndef TL_EXPECTED_NO_CONSTRR
+ template <class F>
+ constexpr decltype(expected_map_impl(std::declval<const expected &&>(),
+ std::declval<F &&>()))
+ transform(F &&f) const && {
+ return expected_map_impl(std::move(*this), std::forward<F>(f));
+ }
+#endif
+#endif
+
+#if defined(TL_EXPECTED_CXX14) && !defined(TL_EXPECTED_GCC49) && \
+ !defined(TL_EXPECTED_GCC54) && !defined(TL_EXPECTED_GCC55)
+ template <class F> TL_EXPECTED_11_CONSTEXPR auto map_error(F &&f) & {
+ return map_error_impl(*this, std::forward<F>(f));
+ }
+ template <class F> TL_EXPECTED_11_CONSTEXPR auto map_error(F &&f) && {
+ return map_error_impl(std::move(*this), std::forward<F>(f));
+ }
+ template <class F> constexpr auto map_error(F &&f) const & {
+ return map_error_impl(*this, std::forward<F>(f));
+ }
+ template <class F> constexpr auto map_error(F &&f) const && {
+ return map_error_impl(std::move(*this), std::forward<F>(f));
+ }
+#else
+ template <class F>
+ TL_EXPECTED_11_CONSTEXPR decltype(map_error_impl(std::declval<expected &>(),
+ std::declval<F &&>()))
+ map_error(F &&f) & {
+ return map_error_impl(*this, std::forward<F>(f));
+ }
+ template <class F>
+ TL_EXPECTED_11_CONSTEXPR decltype(map_error_impl(std::declval<expected &&>(),
+ std::declval<F &&>()))
+ map_error(F &&f) && {
+ return map_error_impl(std::move(*this), std::forward<F>(f));
+ }
+ template <class F>
+ constexpr decltype(map_error_impl(std::declval<const expected &>(),
+ std::declval<F &&>()))
+ map_error(F &&f) const & {
+ return map_error_impl(*this, std::forward<F>(f));
+ }
+
+#ifndef TL_EXPECTED_NO_CONSTRR
+ template <class F>
+ constexpr decltype(map_error_impl(std::declval<const expected &&>(),
+ std::declval<F &&>()))
+ map_error(F &&f) const && {
+ return map_error_impl(std::move(*this), std::forward<F>(f));
+ }
+#endif
+#endif
+#if defined(TL_EXPECTED_CXX14) && !defined(TL_EXPECTED_GCC49) && \
+ !defined(TL_EXPECTED_GCC54) && !defined(TL_EXPECTED_GCC55)
+ template <class F> TL_EXPECTED_11_CONSTEXPR auto transform_error(F &&f) & {
+ return map_error_impl(*this, std::forward<F>(f));
+ }
+ template <class F> TL_EXPECTED_11_CONSTEXPR auto transform_error(F &&f) && {
+ return map_error_impl(std::move(*this), std::forward<F>(f));
+ }
+ template <class F> constexpr auto transform_error(F &&f) const & {
+ return map_error_impl(*this, std::forward<F>(f));
+ }
+ template <class F> constexpr auto transform_error(F &&f) const && {
+ return map_error_impl(std::move(*this), std::forward<F>(f));
+ }
+#else
+ template <class F>
+ TL_EXPECTED_11_CONSTEXPR decltype(map_error_impl(std::declval<expected &>(),
+ std::declval<F &&>()))
+ transform_error(F &&f) & {
+ return map_error_impl(*this, std::forward<F>(f));
+ }
+ template <class F>
+ TL_EXPECTED_11_CONSTEXPR decltype(map_error_impl(std::declval<expected &&>(),
+ std::declval<F &&>()))
+ transform_error(F &&f) && {
+ return map_error_impl(std::move(*this), std::forward<F>(f));
+ }
+ template <class F>
+ constexpr decltype(map_error_impl(std::declval<const expected &>(),
+ std::declval<F &&>()))
+ transform_error(F &&f) const & {
+ return map_error_impl(*this, std::forward<F>(f));
+ }
+
+#ifndef TL_EXPECTED_NO_CONSTRR
+ template <class F>
+ constexpr decltype(map_error_impl(std::declval<const expected &&>(),
+ std::declval<F &&>()))
+ transform_error(F &&f) const && {
+ return map_error_impl(std::move(*this), std::forward<F>(f));
+ }
+#endif
+#endif
+ template <class F> expected TL_EXPECTED_11_CONSTEXPR or_else(F &&f) & {
+ return or_else_impl(*this, std::forward<F>(f));
+ }
+
+ template <class F> expected TL_EXPECTED_11_CONSTEXPR or_else(F &&f) && {
+ return or_else_impl(std::move(*this), std::forward<F>(f));
+ }
+
+ template <class F> expected constexpr or_else(F &&f) const & {
+ return or_else_impl(*this, std::forward<F>(f));
+ }
+
+#ifndef TL_EXPECTED_NO_CONSTRR
+ template <class F> expected constexpr or_else(F &&f) const && {
+ return or_else_impl(std::move(*this), std::forward<F>(f));
+ }
+#endif
+ constexpr expected() = default;
+ constexpr expected(const expected &rhs) = default;
+ constexpr expected(expected &&rhs) = default;
+ expected &operator=(const expected &rhs) = default;
+ expected &operator=(expected &&rhs) = default;
+
+ template <class... Args,
+ detail::enable_if_t<std::is_constructible<T, Args &&...>::value> * =
+ nullptr>
+ constexpr expected(in_place_t, Args &&...args)
+ : impl_base(in_place, std::forward<Args>(args)...),
+ ctor_base(detail::default_constructor_tag{}) {}
+
+ template <class U, class... Args,
+ detail::enable_if_t<std::is_constructible<
+ T, std::initializer_list<U> &, Args &&...>::value> * = nullptr>
+ constexpr expected(in_place_t, std::initializer_list<U> il, Args &&...args)
+ : impl_base(in_place, il, std::forward<Args>(args)...),
+ ctor_base(detail::default_constructor_tag{}) {}
+
+ template <class G = E,
+ detail::enable_if_t<std::is_constructible<E, const G &>::value> * =
+ nullptr,
+ detail::enable_if_t<!std::is_convertible<const G &, E>::value> * =
+ nullptr>
+ explicit constexpr expected(const unexpected<G> &e)
+ : impl_base(unexpect, e.value()),
+ ctor_base(detail::default_constructor_tag{}) {}
+
+ template <
+ class G = E,
+ detail::enable_if_t<std::is_constructible<E, const G &>::value> * =
+ nullptr,
+ detail::enable_if_t<std::is_convertible<const G &, E>::value> * = nullptr>
+ constexpr expected(unexpected<G> const &e)
+ : impl_base(unexpect, e.value()),
+ ctor_base(detail::default_constructor_tag{}) {}
+
+ template <
+ class G = E,
+ detail::enable_if_t<std::is_constructible<E, G &&>::value> * = nullptr,
+ detail::enable_if_t<!std::is_convertible<G &&, E>::value> * = nullptr>
+ explicit constexpr expected(unexpected<G> &&e) noexcept(
+ std::is_nothrow_constructible<E, G &&>::value)
+ : impl_base(unexpect, std::move(e.value())),
+ ctor_base(detail::default_constructor_tag{}) {}
+
+ template <
+ class G = E,
+ detail::enable_if_t<std::is_constructible<E, G &&>::value> * = nullptr,
+ detail::enable_if_t<std::is_convertible<G &&, E>::value> * = nullptr>
+ constexpr expected(unexpected<G> &&e) noexcept(
+ std::is_nothrow_constructible<E, G &&>::value)
+ : impl_base(unexpect, std::move(e.value())),
+ ctor_base(detail::default_constructor_tag{}) {}
+
+ template <class... Args,
+ detail::enable_if_t<std::is_constructible<E, Args &&...>::value> * =
+ nullptr>
+ constexpr explicit expected(unexpect_t, Args &&...args)
+ : impl_base(unexpect, std::forward<Args>(args)...),
+ ctor_base(detail::default_constructor_tag{}) {}
+
+ template <class U, class... Args,
+ detail::enable_if_t<std::is_constructible<
+ E, std::initializer_list<U> &, Args &&...>::value> * = nullptr>
+ constexpr explicit expected(unexpect_t, std::initializer_list<U> il,
+ Args &&...args)
+ : impl_base(unexpect, il, std::forward<Args>(args)...),
+ ctor_base(detail::default_constructor_tag{}) {}
+
+ template <class U, class G,
+ detail::enable_if_t<!(std::is_convertible<U const &, T>::value &&
+ std::is_convertible<G const &, E>::value)> * =
+ nullptr,
+ detail::expected_enable_from_other<T, E, U, G, const U &, const G &>
+ * = nullptr>
+ explicit TL_EXPECTED_11_CONSTEXPR expected(const expected<U, G> &rhs)
+ : ctor_base(detail::default_constructor_tag{}) {
+ if (rhs.has_value()) {
+ this->construct(*rhs);
+ } else {
+ this->construct_error(rhs.error());
+ }
+ }
+
+ template <class U, class G,
+ detail::enable_if_t<(std::is_convertible<U const &, T>::value &&
+ std::is_convertible<G const &, E>::value)> * =
+ nullptr,
+ detail::expected_enable_from_other<T, E, U, G, const U &, const G &>
+ * = nullptr>
+ TL_EXPECTED_11_CONSTEXPR expected(const expected<U, G> &rhs)
+ : ctor_base(detail::default_constructor_tag{}) {
+ if (rhs.has_value()) {
+ this->construct(*rhs);
+ } else {
+ this->construct_error(rhs.error());
+ }
+ }
+
+ template <
+ class U, class G,
+ detail::enable_if_t<!(std::is_convertible<U &&, T>::value &&
+ std::is_convertible<G &&, E>::value)> * = nullptr,
+ detail::expected_enable_from_other<T, E, U, G, U &&, G &&> * = nullptr>
+ explicit TL_EXPECTED_11_CONSTEXPR expected(expected<U, G> &&rhs)
+ : ctor_base(detail::default_constructor_tag{}) {
+ if (rhs.has_value()) {
+ this->construct(std::move(*rhs));
+ } else {
+ this->construct_error(std::move(rhs.error()));
+ }
+ }
+
+ template <
+ class U, class G,
+ detail::enable_if_t<(std::is_convertible<U &&, T>::value &&
+ std::is_convertible<G &&, E>::value)> * = nullptr,
+ detail::expected_enable_from_other<T, E, U, G, U &&, G &&> * = nullptr>
+ TL_EXPECTED_11_CONSTEXPR expected(expected<U, G> &&rhs)
+ : ctor_base(detail::default_constructor_tag{}) {
+ if (rhs.has_value()) {
+ this->construct(std::move(*rhs));
+ } else {
+ this->construct_error(std::move(rhs.error()));
+ }
+ }
+
+ template <
+ class U = T,
+ detail::enable_if_t<!std::is_convertible<U &&, T>::value> * = nullptr,
+ detail::expected_enable_forward_value<T, E, U> * = nullptr>
+ explicit TL_EXPECTED_MSVC2015_CONSTEXPR expected(U &&v)
+ : expected(in_place, std::forward<U>(v)) {}
+
+ template <
+ class U = T,
+ detail::enable_if_t<std::is_convertible<U &&, T>::value> * = nullptr,
+ detail::expected_enable_forward_value<T, E, U> * = nullptr>
+ TL_EXPECTED_MSVC2015_CONSTEXPR expected(U &&v)
+ : expected(in_place, std::forward<U>(v)) {}
+
+ template <
+ class U = T, class G = T,
+ detail::enable_if_t<std::is_nothrow_constructible<T, U &&>::value> * =
+ nullptr,
+ detail::enable_if_t<!std::is_void<G>::value> * = nullptr,
+ detail::enable_if_t<
+ (!std::is_same<expected<T, E>, detail::decay_t<U>>::value &&
+ !detail::conjunction<std::is_scalar<T>,
+ std::is_same<T, detail::decay_t<U>>>::value &&
+ std::is_constructible<T, U>::value &&
+ std::is_assignable<G &, U>::value &&
+ std::is_nothrow_move_constructible<E>::value)> * = nullptr>
+ expected &operator=(U &&v) {
+ if (has_value()) {
+ val() = std::forward<U>(v);
+ } else {
+ err().~unexpected<E>();
+ ::new (valptr()) T(std::forward<U>(v));
+ this->m_has_val = true;
+ }
+
+ return *this;
+ }
+
+ template <
+ class U = T, class G = T,
+ detail::enable_if_t<!std::is_nothrow_constructible<T, U &&>::value> * =
+ nullptr,
+ detail::enable_if_t<!std::is_void<U>::value> * = nullptr,
+ detail::enable_if_t<
+ (!std::is_same<expected<T, E>, detail::decay_t<U>>::value &&
+ !detail::conjunction<std::is_scalar<T>,
+ std::is_same<T, detail::decay_t<U>>>::value &&
+ std::is_constructible<T, U>::value &&
+ std::is_assignable<G &, U>::value &&
+ std::is_nothrow_move_constructible<E>::value)> * = nullptr>
+ expected &operator=(U &&v) {
+ if (has_value()) {
+ val() = std::forward<U>(v);
+ } else {
+ auto tmp = std::move(err());
+ err().~unexpected<E>();
+
+#ifdef TL_EXPECTED_EXCEPTIONS_ENABLED
+ try {
+ ::new (valptr()) T(std::forward<U>(v));
+ this->m_has_val = true;
+ } catch (...) {
+ err() = std::move(tmp);
+ throw;
+ }
+#else
+ ::new (valptr()) T(std::forward<U>(v));
+ this->m_has_val = true;
+#endif
+ }
+
+ return *this;
+ }
+
+ template <class G = E,
+ detail::enable_if_t<std::is_nothrow_copy_constructible<G>::value &&
+ std::is_assignable<G &, G>::value> * = nullptr>
+ expected &operator=(const unexpected<G> &rhs) {
+ if (!has_value()) {
+ err() = rhs;
+ } else {
+ this->destroy_val();
+ ::new (errptr()) unexpected<E>(rhs);
+ this->m_has_val = false;
+ }
+
+ return *this;
+ }
+
+ template <class G = E,
+ detail::enable_if_t<std::is_nothrow_move_constructible<G>::value &&
+ std::is_move_assignable<G>::value> * = nullptr>
+ expected &operator=(unexpected<G> &&rhs) noexcept {
+ if (!has_value()) {
+ err() = std::move(rhs);
+ } else {
+ this->destroy_val();
+ ::new (errptr()) unexpected<E>(std::move(rhs));
+ this->m_has_val = false;
+ }
+
+ return *this;
+ }
+
+ template <class... Args, detail::enable_if_t<std::is_nothrow_constructible<
+ T, Args &&...>::value> * = nullptr>
+ void emplace(Args &&...args) {
+ if (has_value()) {
+ val().~T();
+ } else {
+ err().~unexpected<E>();
+ this->m_has_val = true;
+ }
+ ::new (valptr()) T(std::forward<Args>(args)...);
+ }
+
+ template <class... Args, detail::enable_if_t<!std::is_nothrow_constructible<
+ T, Args &&...>::value> * = nullptr>
+ void emplace(Args &&...args) {
+ if (has_value()) {
+ val().~T();
+ ::new (valptr()) T(std::forward<Args>(args)...);
+ } else {
+ auto tmp = std::move(err());
+ err().~unexpected<E>();
+
+#ifdef TL_EXPECTED_EXCEPTIONS_ENABLED
+ try {
+ ::new (valptr()) T(std::forward<Args>(args)...);
+ this->m_has_val = true;
+ } catch (...) {
+ err() = std::move(tmp);
+ throw;
+ }
+#else
+ ::new (valptr()) T(std::forward<Args>(args)...);
+ this->m_has_val = true;
+#endif
+ }
+ }
+
+ template <class U, class... Args,
+ detail::enable_if_t<std::is_nothrow_constructible<
+ T, std::initializer_list<U> &, Args &&...>::value> * = nullptr>
+ void emplace(std::initializer_list<U> il, Args &&...args) {
+ if (has_value()) {
+ T t(il, std::forward<Args>(args)...);
+ val() = std::move(t);
+ } else {
+ err().~unexpected<E>();
+ ::new (valptr()) T(il, std::forward<Args>(args)...);
+ this->m_has_val = true;
+ }
+ }
+
+ template <class U, class... Args,
+ detail::enable_if_t<!std::is_nothrow_constructible<
+ T, std::initializer_list<U> &, Args &&...>::value> * = nullptr>
+ void emplace(std::initializer_list<U> il, Args &&...args) {
+ if (has_value()) {
+ T t(il, std::forward<Args>(args)...);
+ val() = std::move(t);
+ } else {
+ auto tmp = std::move(err());
+ err().~unexpected<E>();
+
+#ifdef TL_EXPECTED_EXCEPTIONS_ENABLED
+ try {
+ ::new (valptr()) T(il, std::forward<Args>(args)...);
+ this->m_has_val = true;
+ } catch (...) {
+ err() = std::move(tmp);
+ throw;
+ }
+#else
+ ::new (valptr()) T(il, std::forward<Args>(args)...);
+ this->m_has_val = true;
+#endif
+ }
+ }
+
+private:
+ using t_is_void = std::true_type;
+ using t_is_not_void = std::false_type;
+ using t_is_nothrow_move_constructible = std::true_type;
+ using move_constructing_t_can_throw = std::false_type;
+ using e_is_nothrow_move_constructible = std::true_type;
+ using move_constructing_e_can_throw = std::false_type;
+
+ void swap_where_both_have_value(expected & /*rhs*/, t_is_void) noexcept {
+ // swapping void is a no-op
+ }
+
+ void swap_where_both_have_value(expected &rhs, t_is_not_void) {
+ using std::swap;
+ swap(val(), rhs.val());
+ }
+
+ void swap_where_only_one_has_value(expected &rhs, t_is_void) noexcept(
+ std::is_nothrow_move_constructible<E>::value) {
+ ::new (errptr()) unexpected_type(std::move(rhs.err()));
+ rhs.err().~unexpected_type();
+ std::swap(this->m_has_val, rhs.m_has_val);
+ }
+
+ void swap_where_only_one_has_value(expected &rhs, t_is_not_void) {
+ swap_where_only_one_has_value_and_t_is_not_void(
+ rhs, typename std::is_nothrow_move_constructible<T>::type{},
+ typename std::is_nothrow_move_constructible<E>::type{});
+ }
+
+ void swap_where_only_one_has_value_and_t_is_not_void(
+ expected &rhs, t_is_nothrow_move_constructible,
+ e_is_nothrow_move_constructible) noexcept {
+ auto temp = std::move(val());
+ val().~T();
+ ::new (errptr()) unexpected_type(std::move(rhs.err()));
+ rhs.err().~unexpected_type();
+ ::new (rhs.valptr()) T(std::move(temp));
+ std::swap(this->m_has_val, rhs.m_has_val);
+ }
+
+ void swap_where_only_one_has_value_and_t_is_not_void(
+ expected &rhs, t_is_nothrow_move_constructible,
+ move_constructing_e_can_throw) {
+ auto temp = std::move(val());
+ val().~T();
+#ifdef TL_EXPECTED_EXCEPTIONS_ENABLED
+ try {
+ ::new (errptr()) unexpected_type(std::move(rhs.err()));
+ rhs.err().~unexpected_type();
+ ::new (rhs.valptr()) T(std::move(temp));
+ std::swap(this->m_has_val, rhs.m_has_val);
+ } catch (...) {
+ val() = std::move(temp);
+ throw;
+ }
+#else
+ ::new (errptr()) unexpected_type(std::move(rhs.err()));
+ rhs.err().~unexpected_type();
+ ::new (rhs.valptr()) T(std::move(temp));
+ std::swap(this->m_has_val, rhs.m_has_val);
+#endif
+ }
+
+ void swap_where_only_one_has_value_and_t_is_not_void(
+ expected &rhs, move_constructing_t_can_throw,
+ e_is_nothrow_move_constructible) {
+ auto temp = std::move(rhs.err());
+ rhs.err().~unexpected_type();
+#ifdef TL_EXPECTED_EXCEPTIONS_ENABLED
+ try {
+ ::new (rhs.valptr()) T(std::move(val()));
+ val().~T();
+ ::new (errptr()) unexpected_type(std::move(temp));
+ std::swap(this->m_has_val, rhs.m_has_val);
+ } catch (...) {
+ rhs.err() = std::move(temp);
+ throw;
+ }
+#else
+ ::new (rhs.valptr()) T(std::move(val()));
+ val().~T();
+ ::new (errptr()) unexpected_type(std::move(temp));
+ std::swap(this->m_has_val, rhs.m_has_val);
+#endif
+ }
+
+public:
+ template <class OT = T, class OE = E>
+ detail::enable_if_t<detail::is_swappable<OT>::value &&
+ detail::is_swappable<OE>::value &&
+ (std::is_nothrow_move_constructible<OT>::value ||
+ std::is_nothrow_move_constructible<OE>::value)>
+ swap(expected &rhs) noexcept(
+ std::is_nothrow_move_constructible<T>::value
+ &&detail::is_nothrow_swappable<T>::value
+ &&std::is_nothrow_move_constructible<E>::value
+ &&detail::is_nothrow_swappable<E>::value) {
+ if (has_value() && rhs.has_value()) {
+ swap_where_both_have_value(rhs, typename std::is_void<T>::type{});
+ } else if (!has_value() && rhs.has_value()) {
+ rhs.swap(*this);
+ } else if (has_value()) {
+ swap_where_only_one_has_value(rhs, typename std::is_void<T>::type{});
+ } else {
+ using std::swap;
+ swap(err(), rhs.err());
+ }
+ }
+
+ constexpr const T *operator->() const {
+ TL_ASSERT(has_value());
+ return valptr();
+ }
+ TL_EXPECTED_11_CONSTEXPR T *operator->() {
+ TL_ASSERT(has_value());
+ return valptr();
+ }
+
+ template <class U = T,
+ detail::enable_if_t<!std::is_void<U>::value> * = nullptr>
+ constexpr const U &operator*() const & {
+ TL_ASSERT(has_value());
+ return val();
+ }
+ template <class U = T,
+ detail::enable_if_t<!std::is_void<U>::value> * = nullptr>
+ TL_EXPECTED_11_CONSTEXPR U &operator*() & {
+ TL_ASSERT(has_value());
+ return val();
+ }
+ template <class U = T,
+ detail::enable_if_t<!std::is_void<U>::value> * = nullptr>
+ constexpr const U &&operator*() const && {
+ TL_ASSERT(has_value());
+ return std::move(val());
+ }
+ template <class U = T,
+ detail::enable_if_t<!std::is_void<U>::value> * = nullptr>
+ TL_EXPECTED_11_CONSTEXPR U &&operator*() && {
+ TL_ASSERT(has_value());
+ return std::move(val());
+ }
+
+ constexpr bool has_value() const noexcept { return this->m_has_val; }
+ constexpr explicit operator bool() const noexcept { return this->m_has_val; }
+
+ template <class U = T,
+ detail::enable_if_t<!std::is_void<U>::value> * = nullptr>
+ TL_EXPECTED_11_CONSTEXPR const U &value() const & {
+ if (!has_value())
+ detail::throw_exception(bad_expected_access<E>(err().value()));
+ return val();
+ }
+ template <class U = T,
+ detail::enable_if_t<!std::is_void<U>::value> * = nullptr>
+ TL_EXPECTED_11_CONSTEXPR U &value() & {
+ if (!has_value())
+ detail::throw_exception(bad_expected_access<E>(err().value()));
+ return val();
+ }
+ template <class U = T,
+ detail::enable_if_t<!std::is_void<U>::value> * = nullptr>
+ TL_EXPECTED_11_CONSTEXPR const U &&value() const && {
+ if (!has_value())
+ detail::throw_exception(bad_expected_access<E>(std::move(err()).value()));
+ return std::move(val());
+ }
+ template <class U = T,
+ detail::enable_if_t<!std::is_void<U>::value> * = nullptr>
+ TL_EXPECTED_11_CONSTEXPR U &&value() && {
+ if (!has_value())
+ detail::throw_exception(bad_expected_access<E>(std::move(err()).value()));
+ return std::move(val());
+ }
+
+ constexpr const E &error() const & {
+ TL_ASSERT(!has_value());
+ return err().value();
+ }
+ TL_EXPECTED_11_CONSTEXPR E &error() & {
+ TL_ASSERT(!has_value());
+ return err().value();
+ }
+ constexpr const E &&error() const && {
+ TL_ASSERT(!has_value());
+ return std::move(err().value());
+ }
+ TL_EXPECTED_11_CONSTEXPR E &&error() && {
+ TL_ASSERT(!has_value());
+ return std::move(err().value());
+ }
+
+ template <class U> constexpr T value_or(U &&v) const & {
+ static_assert(std::is_copy_constructible<T>::value &&
+ std::is_convertible<U &&, T>::value,
+ "T must be copy-constructible and convertible to from U&&");
+ return bool(*this) ? **this : static_cast<T>(std::forward<U>(v));
+ }
+ template <class U> TL_EXPECTED_11_CONSTEXPR T value_or(U &&v) && {
+ static_assert(std::is_move_constructible<T>::value &&
+ std::is_convertible<U &&, T>::value,
+ "T must be move-constructible and convertible to from U&&");
+ return bool(*this) ? std::move(**this) : static_cast<T>(std::forward<U>(v));
+ }
+};
+
+namespace detail {
+template <class Exp> using exp_t = typename detail::decay_t<Exp>::value_type;
+template <class Exp> using err_t = typename detail::decay_t<Exp>::error_type;
+template <class Exp, class Ret> using ret_t = expected<Ret, err_t<Exp>>;
+
+#ifdef TL_EXPECTED_CXX14
+template <class Exp, class F,
+ detail::enable_if_t<!std::is_void<exp_t<Exp>>::value> * = nullptr,
+ class Ret = decltype(detail::invoke(std::declval<F>(),
+ *std::declval<Exp>()))>
+constexpr auto and_then_impl(Exp &&exp, F &&f) {
+ static_assert(detail::is_expected<Ret>::value, "F must return an expected");
+
+ return exp.has_value()
+ ? detail::invoke(std::forward<F>(f), *std::forward<Exp>(exp))
+ : Ret(unexpect, std::forward<Exp>(exp).error());
+}
+
+template <class Exp, class F,
+ detail::enable_if_t<std::is_void<exp_t<Exp>>::value> * = nullptr,
+ class Ret = decltype(detail::invoke(std::declval<F>()))>
+constexpr auto and_then_impl(Exp &&exp, F &&f) {
+ static_assert(detail::is_expected<Ret>::value, "F must return an expected");
+
+ return exp.has_value() ? detail::invoke(std::forward<F>(f))
+ : Ret(unexpect, std::forward<Exp>(exp).error());
+}
+#else
+template <class> struct TC;
+template <class Exp, class F,
+ class Ret = decltype(detail::invoke(std::declval<F>(),
+ *std::declval<Exp>())),
+ detail::enable_if_t<!std::is_void<exp_t<Exp>>::value> * = nullptr>
+auto and_then_impl(Exp &&exp, F &&f) -> Ret {
+ static_assert(detail::is_expected<Ret>::value, "F must return an expected");
+
+ return exp.has_value()
+ ? detail::invoke(std::forward<F>(f), *std::forward<Exp>(exp))
+ : Ret(unexpect, std::forward<Exp>(exp).error());
+}
+
+template <class Exp, class F,
+ class Ret = decltype(detail::invoke(std::declval<F>())),
+ detail::enable_if_t<std::is_void<exp_t<Exp>>::value> * = nullptr>
+constexpr auto and_then_impl(Exp &&exp, F &&f) -> Ret {
+ static_assert(detail::is_expected<Ret>::value, "F must return an expected");
+
+ return exp.has_value() ? detail::invoke(std::forward<F>(f))
+ : Ret(unexpect, std::forward<Exp>(exp).error());
+}
+#endif
+
+#ifdef TL_EXPECTED_CXX14
+template <class Exp, class F,
+ detail::enable_if_t<!std::is_void<exp_t<Exp>>::value> * = nullptr,
+ class Ret = decltype(detail::invoke(std::declval<F>(),
+ *std::declval<Exp>())),
+ detail::enable_if_t<!std::is_void<Ret>::value> * = nullptr>
+constexpr auto expected_map_impl(Exp &&exp, F &&f) {
+ using result = ret_t<Exp, detail::decay_t<Ret>>;
+ return exp.has_value() ? result(detail::invoke(std::forward<F>(f),
+ *std::forward<Exp>(exp)))
+ : result(unexpect, std::forward<Exp>(exp).error());
+}
+
+template <class Exp, class F,
+ detail::enable_if_t<!std::is_void<exp_t<Exp>>::value> * = nullptr,
+ class Ret = decltype(detail::invoke(std::declval<F>(),
+ *std::declval<Exp>())),
+ detail::enable_if_t<std::is_void<Ret>::value> * = nullptr>
+auto expected_map_impl(Exp &&exp, F &&f) {
+ using result = expected<void, err_t<Exp>>;
+ if (exp.has_value()) {
+ detail::invoke(std::forward<F>(f), *std::forward<Exp>(exp));
+ return result();
+ }
+
+ return result(unexpect, std::forward<Exp>(exp).error());
+}
+
+template <class Exp, class F,
+ detail::enable_if_t<std::is_void<exp_t<Exp>>::value> * = nullptr,
+ class Ret = decltype(detail::invoke(std::declval<F>())),
+ detail::enable_if_t<!std::is_void<Ret>::value> * = nullptr>
+constexpr auto expected_map_impl(Exp &&exp, F &&f) {
+ using result = ret_t<Exp, detail::decay_t<Ret>>;
+ return exp.has_value() ? result(detail::invoke(std::forward<F>(f)))
+ : result(unexpect, std::forward<Exp>(exp).error());
+}
+
+template <class Exp, class F,
+ detail::enable_if_t<std::is_void<exp_t<Exp>>::value> * = nullptr,
+ class Ret = decltype(detail::invoke(std::declval<F>())),
+ detail::enable_if_t<std::is_void<Ret>::value> * = nullptr>
+auto expected_map_impl(Exp &&exp, F &&f) {
+ using result = expected<void, err_t<Exp>>;
+ if (exp.has_value()) {
+ detail::invoke(std::forward<F>(f));
+ return result();
+ }
+
+ return result(unexpect, std::forward<Exp>(exp).error());
+}
+#else
+template <class Exp, class F,
+ detail::enable_if_t<!std::is_void<exp_t<Exp>>::value> * = nullptr,
+ class Ret = decltype(detail::invoke(std::declval<F>(),
+ *std::declval<Exp>())),
+ detail::enable_if_t<!std::is_void<Ret>::value> * = nullptr>
+
+constexpr auto expected_map_impl(Exp &&exp, F &&f)
+ -> ret_t<Exp, detail::decay_t<Ret>> {
+ using result = ret_t<Exp, detail::decay_t<Ret>>;
+
+ return exp.has_value() ? result(detail::invoke(std::forward<F>(f),
+ *std::forward<Exp>(exp)))
+ : result(unexpect, std::forward<Exp>(exp).error());
+}
+
+template <class Exp, class F,
+ detail::enable_if_t<!std::is_void<exp_t<Exp>>::value> * = nullptr,
+ class Ret = decltype(detail::invoke(std::declval<F>(),
+ *std::declval<Exp>())),
+ detail::enable_if_t<std::is_void<Ret>::value> * = nullptr>
+
+auto expected_map_impl(Exp &&exp, F &&f) -> expected<void, err_t<Exp>> {
+ if (exp.has_value()) {
+ detail::invoke(std::forward<F>(f), *std::forward<Exp>(exp));
+ return {};
+ }
+
+ return unexpected<err_t<Exp>>(std::forward<Exp>(exp).error());
+}
+
+template <class Exp, class F,
+ detail::enable_if_t<std::is_void<exp_t<Exp>>::value> * = nullptr,
+ class Ret = decltype(detail::invoke(std::declval<F>())),
+ detail::enable_if_t<!std::is_void<Ret>::value> * = nullptr>
+
+constexpr auto expected_map_impl(Exp &&exp, F &&f)
+ -> ret_t<Exp, detail::decay_t<Ret>> {
+ using result = ret_t<Exp, detail::decay_t<Ret>>;
+
+ return exp.has_value() ? result(detail::invoke(std::forward<F>(f)))
+ : result(unexpect, std::forward<Exp>(exp).error());
+}
+
+template <class Exp, class F,
+ detail::enable_if_t<std::is_void<exp_t<Exp>>::value> * = nullptr,
+ class Ret = decltype(detail::invoke(std::declval<F>())),
+ detail::enable_if_t<std::is_void<Ret>::value> * = nullptr>
+
+auto expected_map_impl(Exp &&exp, F &&f) -> expected<void, err_t<Exp>> {
+ if (exp.has_value()) {
+ detail::invoke(std::forward<F>(f));
+ return {};
+ }
+
+ return unexpected<err_t<Exp>>(std::forward<Exp>(exp).error());
+}
+#endif
+
+#if defined(TL_EXPECTED_CXX14) && !defined(TL_EXPECTED_GCC49) && \
+ !defined(TL_EXPECTED_GCC54) && !defined(TL_EXPECTED_GCC55)
+template <class Exp, class F,
+ detail::enable_if_t<!std::is_void<exp_t<Exp>>::value> * = nullptr,
+ class Ret = decltype(detail::invoke(std::declval<F>(),
+ std::declval<Exp>().error())),
+ detail::enable_if_t<!std::is_void<Ret>::value> * = nullptr>
+constexpr auto map_error_impl(Exp &&exp, F &&f) {
+ using result = expected<exp_t<Exp>, detail::decay_t<Ret>>;
+ return exp.has_value()
+ ? result(*std::forward<Exp>(exp))
+ : result(unexpect, detail::invoke(std::forward<F>(f),
+ std::forward<Exp>(exp).error()));
+}
+template <class Exp, class F,
+ detail::enable_if_t<!std::is_void<exp_t<Exp>>::value> * = nullptr,
+ class Ret = decltype(detail::invoke(std::declval<F>(),
+ std::declval<Exp>().error())),
+ detail::enable_if_t<std::is_void<Ret>::value> * = nullptr>
+auto map_error_impl(Exp &&exp, F &&f) {
+ using result = expected<exp_t<Exp>, monostate>;
+ if (exp.has_value()) {
+ return result(*std::forward<Exp>(exp));
+ }
+
+ detail::invoke(std::forward<F>(f), std::forward<Exp>(exp).error());
+ return result(unexpect, monostate{});
+}
+template <class Exp, class F,
+ detail::enable_if_t<std::is_void<exp_t<Exp>>::value> * = nullptr,
+ class Ret = decltype(detail::invoke(std::declval<F>(),
+ std::declval<Exp>().error())),
+ detail::enable_if_t<!std::is_void<Ret>::value> * = nullptr>
+constexpr auto map_error_impl(Exp &&exp, F &&f) {
+ using result = expected<exp_t<Exp>, detail::decay_t<Ret>>;
+ return exp.has_value()
+ ? result()
+ : result(unexpect, detail::invoke(std::forward<F>(f),
+ std::forward<Exp>(exp).error()));
+}
+template <class Exp, class F,
+ detail::enable_if_t<std::is_void<exp_t<Exp>>::value> * = nullptr,
+ class Ret = decltype(detail::invoke(std::declval<F>(),
+ std::declval<Exp>().error())),
+ detail::enable_if_t<std::is_void<Ret>::value> * = nullptr>
+auto map_error_impl(Exp &&exp, F &&f) {
+ using result = expected<exp_t<Exp>, monostate>;
+ if (exp.has_value()) {
+ return result();
+ }
+
+ detail::invoke(std::forward<F>(f), std::forward<Exp>(exp).error());
+ return result(unexpect, monostate{});
+}
+#else
+template <class Exp, class F,
+ detail::enable_if_t<!std::is_void<exp_t<Exp>>::value> * = nullptr,
+ class Ret = decltype(detail::invoke(std::declval<F>(),
+ std::declval<Exp>().error())),
+ detail::enable_if_t<!std::is_void<Ret>::value> * = nullptr>
+constexpr auto map_error_impl(Exp &&exp, F &&f)
+ -> expected<exp_t<Exp>, detail::decay_t<Ret>> {
+ using result = expected<exp_t<Exp>, detail::decay_t<Ret>>;
+
+ return exp.has_value()
+ ? result(*std::forward<Exp>(exp))
+ : result(unexpect, detail::invoke(std::forward<F>(f),
+ std::forward<Exp>(exp).error()));
+}
+
+template <class Exp, class F,
+ detail::enable_if_t<!std::is_void<exp_t<Exp>>::value> * = nullptr,
+ class Ret = decltype(detail::invoke(std::declval<F>(),
+ std::declval<Exp>().error())),
+ detail::enable_if_t<std::is_void<Ret>::value> * = nullptr>
+auto map_error_impl(Exp &&exp, F &&f) -> expected<exp_t<Exp>, monostate> {
+ using result = expected<exp_t<Exp>, monostate>;
+ if (exp.has_value()) {
+ return result(*std::forward<Exp>(exp));
+ }
+
+ detail::invoke(std::forward<F>(f), std::forward<Exp>(exp).error());
+ return result(unexpect, monostate{});
+}
+
+template <class Exp, class F,
+ detail::enable_if_t<std::is_void<exp_t<Exp>>::value> * = nullptr,
+ class Ret = decltype(detail::invoke(std::declval<F>(),
+ std::declval<Exp>().error())),
+ detail::enable_if_t<!std::is_void<Ret>::value> * = nullptr>
+constexpr auto map_error_impl(Exp &&exp, F &&f)
+ -> expected<exp_t<Exp>, detail::decay_t<Ret>> {
+ using result = expected<exp_t<Exp>, detail::decay_t<Ret>>;
+
+ return exp.has_value()
+ ? result()
+ : result(unexpect, detail::invoke(std::forward<F>(f),
+ std::forward<Exp>(exp).error()));
+}
+
+template <class Exp, class F,
+ detail::enable_if_t<std::is_void<exp_t<Exp>>::value> * = nullptr,
+ class Ret = decltype(detail::invoke(std::declval<F>(),
+ std::declval<Exp>().error())),
+ detail::enable_if_t<std::is_void<Ret>::value> * = nullptr>
+auto map_error_impl(Exp &&exp, F &&f) -> expected<exp_t<Exp>, monostate> {
+ using result = expected<exp_t<Exp>, monostate>;
+ if (exp.has_value()) {
+ return result();
+ }
+
+ detail::invoke(std::forward<F>(f), std::forward<Exp>(exp).error());
+ return result(unexpect, monostate{});
+}
+#endif
+
+#ifdef TL_EXPECTED_CXX14
+template <class Exp, class F,
+ class Ret = decltype(detail::invoke(std::declval<F>(),
+ std::declval<Exp>().error())),
+ detail::enable_if_t<!std::is_void<Ret>::value> * = nullptr>
+constexpr auto or_else_impl(Exp &&exp, F &&f) {
+ static_assert(detail::is_expected<Ret>::value, "F must return an expected");
+ return exp.has_value() ? std::forward<Exp>(exp)
+ : detail::invoke(std::forward<F>(f),
+ std::forward<Exp>(exp).error());
+}
+
+template <class Exp, class F,
+ class Ret = decltype(detail::invoke(std::declval<F>(),
+ std::declval<Exp>().error())),
+ detail::enable_if_t<std::is_void<Ret>::value> * = nullptr>
+detail::decay_t<Exp> or_else_impl(Exp &&exp, F &&f) {
+ return exp.has_value() ? std::forward<Exp>(exp)
+ : (detail::invoke(std::forward<F>(f),
+ std::forward<Exp>(exp).error()),
+ std::forward<Exp>(exp));
+}
+#else
+template <class Exp, class F,
+ class Ret = decltype(detail::invoke(std::declval<F>(),
+ std::declval<Exp>().error())),
+ detail::enable_if_t<!std::is_void<Ret>::value> * = nullptr>
+auto or_else_impl(Exp &&exp, F &&f) -> Ret {
+ static_assert(detail::is_expected<Ret>::value, "F must return an expected");
+ return exp.has_value() ? std::forward<Exp>(exp)
+ : detail::invoke(std::forward<F>(f),
+ std::forward<Exp>(exp).error());
+}
+
+template <class Exp, class F,
+ class Ret = decltype(detail::invoke(std::declval<F>(),
+ std::declval<Exp>().error())),
+ detail::enable_if_t<std::is_void<Ret>::value> * = nullptr>
+detail::decay_t<Exp> or_else_impl(Exp &&exp, F &&f) {
+ return exp.has_value() ? std::forward<Exp>(exp)
+ : (detail::invoke(std::forward<F>(f),
+ std::forward<Exp>(exp).error()),
+ std::forward<Exp>(exp));
+}
+#endif
+} // namespace detail
+
+template <class T, class E, class U, class F>
+constexpr bool operator==(const expected<T, E> &lhs,
+ const expected<U, F> &rhs) {
+ return (lhs.has_value() != rhs.has_value())
+ ? false
+ : (!lhs.has_value() ? lhs.error() == rhs.error() : *lhs == *rhs);
+}
+template <class T, class E, class U, class F>
+constexpr bool operator!=(const expected<T, E> &lhs,
+ const expected<U, F> &rhs) {
+ return (lhs.has_value() != rhs.has_value())
+ ? true
+ : (!lhs.has_value() ? lhs.error() != rhs.error() : *lhs != *rhs);
+}
+template <class E, class F>
+constexpr bool operator==(const expected<void, E> &lhs,
+ const expected<void, F> &rhs) {
+ return (lhs.has_value() != rhs.has_value())
+ ? false
+ : (!lhs.has_value() ? lhs.error() == rhs.error() : true);
+}
+template <class E, class F>
+constexpr bool operator!=(const expected<void, E> &lhs,
+ const expected<void, F> &rhs) {
+ return (lhs.has_value() != rhs.has_value())
+ ? true
+ : (!lhs.has_value() ? lhs.error() == rhs.error() : false);
+}
+
+template <class T, class E, class U>
+constexpr bool operator==(const expected<T, E> &x, const U &v) {
+ return x.has_value() ? *x == v : false;
+}
+template <class T, class E, class U>
+constexpr bool operator==(const U &v, const expected<T, E> &x) {
+ return x.has_value() ? *x == v : false;
+}
+template <class T, class E, class U>
+constexpr bool operator!=(const expected<T, E> &x, const U &v) {
+ return x.has_value() ? *x != v : true;
+}
+template <class T, class E, class U>
+constexpr bool operator!=(const U &v, const expected<T, E> &x) {
+ return x.has_value() ? *x != v : true;
+}
+
+template <class T, class E>
+constexpr bool operator==(const expected<T, E> &x, const unexpected<E> &e) {
+ return x.has_value() ? false : x.error() == e.value();
+}
+template <class T, class E>
+constexpr bool operator==(const unexpected<E> &e, const expected<T, E> &x) {
+ return x.has_value() ? false : x.error() == e.value();
+}
+template <class T, class E>
+constexpr bool operator!=(const expected<T, E> &x, const unexpected<E> &e) {
+ return x.has_value() ? true : x.error() != e.value();
+}
+template <class T, class E>
+constexpr bool operator!=(const unexpected<E> &e, const expected<T, E> &x) {
+ return x.has_value() ? true : x.error() != e.value();
+}
+
+template <class T, class E,
+ detail::enable_if_t<(std::is_void<T>::value ||
+ std::is_move_constructible<T>::value) &&
+ detail::is_swappable<T>::value &&
+ std::is_move_constructible<E>::value &&
+ detail::is_swappable<E>::value> * = nullptr>
+void swap(expected<T, E> &lhs,
+ expected<T, E> &rhs) noexcept(noexcept(lhs.swap(rhs))) {
+ lhs.swap(rhs);
+}
+} // namespace tl
+
+#endif
// --- Interface ---
-// Return value of `value` (where `T` typically is `nonstd::expected`) or throw
+// Return value of `value` (where `T` typically is `tl::expected`) or throw
// an exception of type `E` with a `T::error_type` as the argument.
template<typename E, typename T>
typename T::value_type value_or_throw(const T& value);
do { \
const auto result = x_; \
if (!result) { \
- return nonstd::make_unexpected(result.error()); \
+ return tl::unexpected(result.error()); \
} \
} while (false)
namespace util {
-nonstd::expected<void, std::string>
+tl::expected<void, std::string>
copy_file(const std::string& src,
const std::string& dest,
ViaTmpFile via_tmp_file)
{
Fd src_fd(open(src.c_str(), O_RDONLY | O_BINARY));
if (!src_fd) {
- return nonstd::make_unexpected(
+ return tl::unexpected(
FMT("Failed to open {} for reading: {}", src, strerror(errno)));
}
dest_fd =
Fd(open(dest.c_str(), O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0666));
if (!dest_fd) {
- return nonstd::make_unexpected(
+ return tl::unexpected(
FMT("Failed to open {} for writing: {}", dest, strerror(errno)));
}
}
if (via_tmp_file == ViaTmpFile::yes) {
const auto result = fs::rename(tmp_file, dest);
if (!result) {
- return nonstd::make_unexpected(FMT("Failed to rename {} to {}: {}",
- tmp_file,
- dest,
- result.error().message()));
+ return tl::unexpected(FMT("Failed to rename {} to {}: {}",
+ tmp_file,
+ dest,
+ result.error().message()));
}
}
}
}
-nonstd::expected<void, std::string>
+tl::expected<void, std::string>
fallocate(int fd, size_t new_size)
{
#ifdef HAVE_POSIX_FALLOCATE
return {};
}
if (posix_fallocate_err != EINVAL) {
- return nonstd::make_unexpected(strerror(posix_fallocate_err));
+ return tl::unexpected(strerror(posix_fallocate_err));
}
// The underlying filesystem does not support the operation so fall back to
// lseek.
if (old_size == -1) {
int err = errno;
lseek(fd, saved_pos, SEEK_SET);
- return nonstd::make_unexpected(strerror(err));
+ return tl::unexpected(strerror(err));
}
if (static_cast<size_t>(old_size) >= new_size) {
lseek(fd, saved_pos, SEEK_SET);
void* buf = calloc(bytes_to_write, 1);
if (!buf) {
lseek(fd, saved_pos, SEEK_SET);
- return nonstd::make_unexpected(strerror(ENOMEM));
+ return tl::unexpected(strerror(ENOMEM));
}
Finalizer buf_freer([&] { free(buf); });
#endif
}
-nonstd::expected<void, std::string>
+tl::expected<void, std::string>
read_fd(int fd, DataReceiver data_receiver)
{
int64_t n;
}
}
if (n == -1) {
- return nonstd::make_unexpected(strerror(errno));
+ return tl::unexpected(strerror(errno));
}
return {};
}
#endif
template<typename T>
-nonstd::expected<T, std::string>
+tl::expected<T, std::string>
read_file(const std::string& path, size_t size_hint)
{
if (size_hint == 0) {
const auto stat = Stat::stat(path);
if (!stat) {
- return nonstd::make_unexpected(strerror(errno));
+ return tl::unexpected(strerror(errno));
}
size_hint = stat.size();
}
}();
Fd fd(open(path.c_str(), open_flags));
if (!fd) {
- return nonstd::make_unexpected(strerror(errno));
+ return tl::unexpected(strerror(errno));
}
int64_t ret = 0;
}
if (ret == -1) {
- return nonstd::make_unexpected(strerror(errno));
+ return tl::unexpected(strerror(errno));
}
result.resize(pos);
nullptr,
nullptr);
if (size <= 0) {
- return nonstd::make_unexpected(
+ return tl::unexpected(
FMT("Failed to convert {} from UTF-16LE to UTF-8: {}",
path,
Win32Util::error_message(GetLastError())));
return result;
}
-template nonstd::expected<util::Bytes, std::string>
-read_file(const std::string& path, size_t size_hint);
+template tl::expected<Bytes, std::string> read_file(const std::string& path,
+ size_t size_hint);
-template nonstd::expected<std::string, std::string>
+template tl::expected<std::string, std::string>
read_file(const std::string& path, size_t size_hint);
-template nonstd::expected<std::vector<uint8_t>, std::string>
+template tl::expected<std::vector<uint8_t>, std::string>
read_file(const std::string& path, size_t size_hint);
template<typename T>
-nonstd::expected<T, std::string>
+tl::expected<T, std::string>
read_file_part(const std::string& path, size_t pos, size_t count)
{
T result;
Fd fd(open(path.c_str(), O_RDONLY | O_BINARY));
if (!fd) {
LOG("Failed to open {}: {}", path, strerror(errno));
- return nonstd::make_unexpected(strerror(errno));
+ return tl::unexpected(strerror(errno));
}
if (pos != 0 && lseek(*fd, pos, SEEK_SET) != static_cast<off_t>(pos)) {
- return nonstd::make_unexpected(strerror(errno));
+ return tl::unexpected(strerror(errno));
}
int64_t ret = 0;
if (ret == -1) {
LOG("Failed to read {}: {}", path, strerror(errno));
- return nonstd::make_unexpected(strerror(errno));
+ return tl::unexpected(strerror(errno));
}
result.resize(bytes_read);
return result;
}
-template nonstd::expected<util::Bytes, std::string>
+template tl::expected<Bytes, std::string>
read_file_part(const std::string& path, size_t pos, size_t count);
-template nonstd::expected<std::string, std::string>
+template tl::expected<std::string, std::string>
read_file_part(const std::string& path, size_t pos, size_t count);
-template nonstd::expected<std::vector<uint8_t>, std::string>
+template tl::expected<std::vector<uint8_t>, std::string>
read_file_part(const std::string& path, size_t pos, size_t count);
-nonstd::expected<bool, std::error_code>
+tl::expected<bool, std::error_code>
remove(const std::string& path, LogFailure log_failure)
{
auto result = fs::remove(path);
return result;
}
-nonstd::expected<bool, std::error_code>
+tl::expected<bool, std::error_code>
remove_nfs_safe(const std::string& path, LogFailure log_failure)
{
// fs::remove isn't atomic if path is on an NFS share, so we rename to a
tmp_name,
rename_result.error().message());
}
- return nonstd::make_unexpected(rename_result.error());
+ return tl::unexpected(rename_result.error());
}
auto remove_result = fs::remove(tmp_name);
#endif
}
-nonstd::expected<void, std::string>
+tl::expected<void, std::string>
write_fd(int fd, const void* data, size_t size)
{
int64_t written = 0;
write(fd, static_cast<const uint8_t*>(data) + written, size - written);
if (count == -1) {
if (errno != EAGAIN && errno != EINTR) {
- return nonstd::make_unexpected(strerror(errno));
+ return tl::unexpected(strerror(errno));
}
} else {
written += count;
return {};
}
-nonstd::expected<void, std::string>
+tl::expected<void, std::string>
write_file(const std::string& path, std::string_view data, InPlace in_place)
{
if (in_place == InPlace::no) {
}
Fd fd(open(path.c_str(), O_WRONLY | O_CREAT | O_TRUNC | O_TEXT, 0666));
if (!fd) {
- return nonstd::make_unexpected(strerror(errno));
+ return tl::unexpected(strerror(errno));
}
return write_fd(*fd, data.data(), data.size());
}
-nonstd::expected<void, std::string>
+tl::expected<void, std::string>
write_file(const std::string& path,
nonstd::span<const uint8_t> data,
InPlace in_place)
}
Fd fd(open(path.c_str(), O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0666));
if (!fd) {
- return nonstd::make_unexpected(strerror(errno));
+ return tl::unexpected(strerror(errno));
}
return write_fd(*fd, data.data(), data.size());
}
#include <util/TimePoint.hpp>
#include <util/types.hpp>
-#include <third_party/nonstd/expected.hpp>
#include <third_party/nonstd/span.hpp>
+#include <third_party/tl/expected.hpp>
#include <cstddef>
#include <cstdint>
#include <optional>
#include <string>
#include <string_view>
+#include <system_error>
namespace util {
// Copy a file from `src` to `dest`. If `via_tmp_file` is yes, `src` is copied
// to a temporary file and then renamed to dest.
-nonstd::expected<void, std::string>
+tl::expected<void, std::string>
copy_file(const std::string& src,
const std::string& dest,
ViaTmpFile via_tmp_file = ViaTmpFile::no);
//
// Note that existing holes are not filled in case posix_fallocate() is not
// supported.
-nonstd::expected<void, std::string> fallocate(int fd, size_t new_size);
+tl::expected<void, std::string> fallocate(int fd, size_t new_size);
// Return how much a file of `size` bytes likely would take on disk.
uint64_t likely_size_on_disk(uint64_t size);
// Read data from `fd` until end of file and call `data_receiver` with the read
// data. Returns an error if the underlying read(2) call returned -1.
-nonstd::expected<void, std::string> read_fd(int fd, DataReceiver data_receiver);
+tl::expected<void, std::string> read_fd(int fd, DataReceiver data_receiver);
// Return contents of file at `path`.
//
// If `size_hint` is not 0 then it is assumed that `path` has this size (this
// saves system calls).
template<typename T>
-nonstd::expected<T, std::string> read_file(const std::string& path,
- size_t size_hint = 0);
+tl::expected<T, std::string> read_file(const std::string& path,
+ size_t size_hint = 0);
// Return (at most) `count` bytes from `path` starting at position `pos`.
//
// with a UTF-16 little-endian BOM on Windows then it will be converted to
// UTF-8.
template<typename T>
-nonstd::expected<T, std::string>
+tl::expected<T, std::string>
read_file_part(const std::string& path, size_t pos, size_t count);
// Remove `path` (non-directory), NFS hazardous. Use only for files that will
//
// Returns whether the file was removed. A nonexistent `path` is considered
// successful.
-nonstd::expected<bool, std::error_code>
+tl::expected<bool, std::error_code>
remove(const std::string& path, LogFailure log_failure = LogFailure::yes);
// Remove `path` (non-directory), NFS safe.
//
// Returns whether the file was removed. A nonexistent `path` is considered a
// successful.
-nonstd::expected<bool, std::error_code>
+tl::expected<bool, std::error_code>
remove_nfs_safe(const std::string& path,
LogFailure log_failure = LogFailure::yes);
std::optional<util::TimePoint> atime = std::nullopt);
// Write `size` bytes from binary `data` to `fd`.
-nonstd::expected<void, std::string>
-write_fd(int fd, const void* data, size_t size);
+tl::expected<void, std::string> write_fd(int fd, const void* data, size_t size);
// Write text `data` to `path`. If `in_place` is no, unlink any existing file
// first (i.e., break hard links).
-nonstd::expected<void, std::string> write_file(const std::string& path,
- std::string_view data,
- InPlace in_place = InPlace::no);
+tl::expected<void, std::string> write_file(const std::string& path,
+ std::string_view data,
+ InPlace in_place = InPlace::no);
// Write binary `data` to `path`. If `in_place` is no, unlink any existing
// file first (i.e., break hard links).
-nonstd::expected<void, std::string> write_file(const std::string& path,
- nonstd::span<const uint8_t> data,
- InPlace in_place = InPlace::no);
+tl::expected<void, std::string> write_file(const std::string& path,
+ nonstd::span<const uint8_t> data,
+ InPlace in_place = InPlace::no);
// --- Inline implementations ---
namespace util::filesystem {
-nonstd::expected<void, std::error_code>
+tl::expected<void, std::error_code>
rename(const std::filesystem::path& old_p, const std::filesystem::path& new_p)
{
#ifndef _WIN32
std::error_code ec;
std::filesystem::rename(old_p, new_p, ec);
if (ec) {
- return nonstd::make_unexpected(ec);
+ return tl::unexpected(ec);
}
#else
// Windows' rename() won't overwrite an existing file, so need to use
MOVEFILE_REPLACE_EXISTING)) {
DWORD error = GetLastError();
// TODO: How should the Win32 error be mapped to std::error_code?
- return nonstd::make_unexpected(
- std::error_code(error, std::system_category()));
+ return tl::unexpected(std::error_code(error, std::system_category()));
}
#endif
return {};
#pragma once
-#include <third_party/nonstd/expected.hpp>
+#include <third_party/tl/expected.hpp>
#include <filesystem>
+#include <system_error>
namespace util::filesystem {
// Define wrapper with no parameters returning non-void result.
#define DEF_WRAP_0_R(name_, r_) \
- inline nonstd::expected<r_, std::error_code> name_() \
+ inline tl::expected<r_, std::error_code> name_() \
{ \
std::error_code ec_; \
auto result_ = std::filesystem::name_(ec_); \
if (ec_) { \
- return nonstd::make_unexpected(ec_); \
+ return tl::unexpected(ec_); \
} \
return result_; \
}
// Define wrapper with one parameter returning non-void result.
#define DEF_WRAP_1_R(name_, r_, t1_, p1_) \
- inline nonstd::expected<r_, std::error_code> name_(t1_ p1_) \
+ inline tl::expected<r_, std::error_code> name_(t1_ p1_) \
{ \
std::error_code ec_; \
auto result_ = std::filesystem::name_(p1_, ec_); \
if (ec_) { \
- return nonstd::make_unexpected(ec_); \
+ return tl::unexpected(ec_); \
} \
return result_; \
}
// Define wrapper with one parameter returning void.
#define DEF_WRAP_1_V(name_, r_, t1_, p1_) \
- inline nonstd::expected<r_, std::error_code> name_(t1_ p1_) \
+ inline tl::expected<r_, std::error_code> name_(t1_ p1_) \
{ \
std::error_code ec_; \
std::filesystem::name_(p1_, ec_); \
if (ec_) { \
- return nonstd::make_unexpected(ec_); \
+ return tl::unexpected(ec_); \
} \
return {}; \
}
// Define wrapper with one parameter returning non-void result.
#define DEF_WRAP_1_R(name_, r_, t1_, p1_) \
- inline nonstd::expected<r_, std::error_code> name_(t1_ p1_) \
+ inline tl::expected<r_, std::error_code> name_(t1_ p1_) \
{ \
std::error_code ec_; \
auto result_ = std::filesystem::name_(p1_, ec_); \
if (ec_) { \
- return nonstd::make_unexpected(ec_); \
+ return tl::unexpected(ec_); \
} \
return result_; \
}
// Define wrapper with two parameters returning void.
#define DEF_WRAP_2_V(name_, r_, t1_, p1_, t2_, p2_) \
- inline nonstd::expected<r_, std::error_code> name_(t1_ p1_, t2_ p2_) \
+ inline tl::expected<r_, std::error_code> name_(t1_ p1_, t2_ p2_) \
{ \
std::error_code ec_; \
std::filesystem::name_(p1_, p2_, ec_); \
if (ec_) { \
- return nonstd::make_unexpected(ec_); \
+ return tl::unexpected(ec_); \
} \
return {}; \
}
// Note: Mingw-w64's std::filesystem::rename is buggy and doesn't properly
// overwrite an existing file, at least in version 9.1.0, hence this custom
// wrapper.
-nonstd::expected<void, std::error_code> rename(const path& old_p,
- const path& new_p);
+tl::expected<void, std::error_code> rename(const path& old_p,
+ const path& new_p);
} // namespace util::filesystem
}
}
-nonstd::expected<double, std::string>
+tl::expected<double, std::string>
parse_double(const std::string& value)
{
size_t end;
}
if (failed || end != value.size()) {
- return nonstd::make_unexpected(
- FMT("invalid floating point: \"{}\"", value));
+ return tl::unexpected(FMT("invalid floating point: \"{}\"", value));
} else {
return result;
}
}
-nonstd::expected<uint64_t, std::string>
+tl::expected<uint64_t, std::string>
parse_duration(std::string_view duration)
{
uint64_t factor = 0;
factor = 1;
break;
default:
- return nonstd::make_unexpected(FMT(
+ return tl::unexpected(FMT(
"invalid suffix (supported: d (day) and s (second)): \"{}\"", duration));
}
return factor * *value;
}
-nonstd::expected<int64_t, std::string>
+tl::expected<int64_t, std::string>
parse_signed(std::string_view value,
const std::optional<int64_t> min_value,
const std::optional<int64_t> max_value,
failed = true;
}
if (failed || end != stripped_value.size()) {
- return nonstd::make_unexpected(
- FMT("invalid integer: \"{}\"", stripped_value));
+ return tl::unexpected(FMT("invalid integer: \"{}\"", stripped_value));
}
const int64_t min = min_value ? *min_value : INT64_MIN;
const int64_t max = max_value ? *max_value : INT64_MAX;
if (result < min || result > max) {
- return nonstd::make_unexpected(
+ return tl::unexpected(
FMT("{} must be between {} and {}", description, min, max));
} else {
return result;
}
}
-nonstd::expected<std::pair<uint64_t, SizeUnitPrefixType>, std::string>
+tl::expected<std::pair<uint64_t, SizeUnitPrefixType>, std::string>
parse_size(const std::string& value)
{
errno = 0;
char* p;
double result = strtod(value.c_str(), &p);
if (errno != 0 || result < 0 || p == value.c_str() || value.empty()) {
- return nonstd::make_unexpected(FMT("invalid size: \"{}\"", value));
+ return tl::unexpected(FMT("invalid size: \"{}\"", value));
}
while (isspace(*p)) {
result *= multiplier;
break;
default:
- return nonstd::make_unexpected(FMT("invalid size: \"{}\"", value));
+ return tl::unexpected(FMT("invalid size: \"{}\"", value));
}
} else {
result *= 1024 * 1024 * 1024;
return std::make_pair(static_cast<uint64_t>(result), prefix_type);
}
-nonstd::expected<mode_t, std::string>
+tl::expected<mode_t, std::string>
parse_umask(std::string_view value)
{
return util::parse_unsigned(value, 0, 0777, "umask", 8);
}
-nonstd::expected<uint64_t, std::string>
+tl::expected<uint64_t, std::string>
parse_unsigned(std::string_view value,
const std::optional<uint64_t> min_value,
const std::optional<uint64_t> max_value,
}
if (failed || end != stripped_value.size()) {
const auto base_info = base == 8 ? "octal " : "";
- return nonstd::make_unexpected(
+ return tl::unexpected(
FMT("invalid unsigned {}integer: \"{}\"", base_info, stripped_value));
}
const uint64_t min = min_value ? *min_value : 0;
const uint64_t max = max_value ? *max_value : UINT64_MAX;
if (result < min || result > max) {
- return nonstd::make_unexpected(
+ return tl::unexpected(
FMT("{} must be between {} and {}", description, min, max));
} else {
return result;
}
}
-nonstd::expected<std::string, std::string>
+tl::expected<std::string, std::string>
percent_decode(std::string_view string)
{
const auto from_hex = [](const char digit) {
result += string[i];
} else if (i + 2 >= string.size() || !std::isxdigit(string[i + 1])
|| !std::isxdigit(string[i + 2])) {
- return nonstd::make_unexpected(
+ return tl::unexpected(
FMT("invalid percent-encoded string at position {}: {}", i, string));
} else {
const char ch = static_cast<char>(from_hex(string[i + 1]) << 4
#include <util/Tokenizer.hpp>
#include <util/conversion.hpp>
-#include <third_party/nonstd/expected.hpp>
#include <third_party/nonstd/span.hpp>
+#include <third_party/tl/expected.hpp>
#include <sys/stat.h> // for mode_t
// Parse a string into a double.
//
// Returns an error string if `value` cannot be parsed as a double.
-nonstd::expected<double, std::string> parse_double(const std::string& value);
+tl::expected<double, std::string> parse_double(const std::string& value);
// Parse `duration`, an unsigned integer with d (days) or s (seconds) suffix,
// into seconds.
-nonstd::expected<uint64_t, std::string>
-parse_duration(std::string_view duration);
+tl::expected<uint64_t, std::string> parse_duration(std::string_view duration);
// Parse a string into a signed integer.
//
// value falls out of the range [`min_value`, `max_value`]. `min_value` and
// `max_value` default to min and max values of int64_t. `description` is
// included in the error message for range violations.
-nonstd::expected<int64_t, std::string>
+tl::expected<int64_t, std::string>
parse_signed(std::string_view value,
std::optional<int64_t> min_value = std::nullopt,
std::optional<int64_t> max_value = std::nullopt,
// Parse a "size value", i.e. a string that can end in k, M, G, T (10-based
// suffixes) or Ki, Mi, Gi, Ti (2-based suffixes). For backward compatibility, K
// is also recognized as a synonym of k.
-nonstd::expected<std::pair<uint64_t, util::SizeUnitPrefixType>, std::string>
+tl::expected<std::pair<uint64_t, SizeUnitPrefixType>, std::string>
parse_size(const std::string& value);
// Parse `value` (an octal integer).
-nonstd::expected<mode_t, std::string> parse_umask(std::string_view value);
+tl::expected<mode_t, std::string> parse_umask(std::string_view value);
// Parse a string into an unsigned integer.
//
// `base`, or if the value falls out of the range [`min_value`, `max_value`].
// `min_value` and `max_value` default to min and max values of uint64_t.
// `description` is included in the error message for range violations.
-nonstd::expected<uint64_t, std::string>
+tl::expected<uint64_t, std::string>
parse_unsigned(std::string_view value,
std::optional<uint64_t> min_value = std::nullopt,
std::optional<uint64_t> max_value = std::nullopt,
// Percent-decode[1] `string`.
//
// [1]: https://en.wikipedia.org/wiki/Percent-encoding
-nonstd::expected<std::string, std::string>
-percent_decode(std::string_view string);
+tl::expected<std::string, std::string> percent_decode(std::string_view string);
// Replace the all occurrences of `from` to `to` in `string`.
std::string replace_all(std::string_view string,
namespace util {
-nonstd::expected<void, std::string>
+tl::expected<void, std::string>
zstd_compress(nonstd::span<const uint8_t> input,
util::Bytes& output,
int8_t compression_level)
input.size(),
compression_level);
if (ZSTD_isError(ret)) {
- return nonstd::make_unexpected(ZSTD_getErrorName(ret));
+ return tl::unexpected(ZSTD_getErrorName(ret));
}
output.resize(original_output_size + ret);
return {};
}
-nonstd::expected<void, std::string>
+tl::expected<void, std::string>
zstd_decompress(nonstd::span<const uint8_t> input,
util::Bytes& output,
size_t original_size)
const size_t ret = ZSTD_decompress(
&output[original_output_size], original_size, input.data(), input.size());
if (ZSTD_isError(ret)) {
- return nonstd::make_unexpected(ZSTD_getErrorName(ret));
+ return tl::unexpected(ZSTD_getErrorName(ret));
}
output.resize(original_output_size + ret);
-// Copyright (C) 2022 Joel Rosdahl and other contributors
+// Copyright (C) 2022-2023 Joel Rosdahl and other contributors
//
// See doc/AUTHORS.adoc for a complete list of contributors.
//
#include <util/Bytes.hpp>
-#include <third_party/nonstd/expected.hpp>
#include <third_party/nonstd/span.hpp>
+#include <third_party/tl/expected.hpp>
#include <cstdint>
#include <string>
namespace util {
-[[nodiscard]] nonstd::expected<void, std::string>
-zstd_compress(nonstd::span<const uint8_t> input,
- util::Bytes& output,
- int8_t compression_level);
+[[nodiscard]] tl::expected<void, std::string> zstd_compress(
+ nonstd::span<const uint8_t> input, Bytes& output, int8_t compression_level);
-[[nodiscard]] nonstd::expected<void, std::string> zstd_decompress(
- nonstd::span<const uint8_t> input, util::Bytes& output, size_t original_size);
+[[nodiscard]] tl::expected<void, std::string> zstd_decompress(
+ nonstd::span<const uint8_t> input, Bytes& output, size_t original_size);
size_t zstd_compress_bound(size_t input_size);
#include <util/expected.hpp>
#include <third_party/doctest.h>
-#include <third_party/nonstd/expected.hpp>
+#include <third_party/tl/expected.hpp>
#include <iostream> // macOS bug: https://github.com/onqtam/doctest/issues/126
#include <memory>
SUBCASE("const ref")
{
- const nonstd::expected<int, const char*> with_value = 42;
- const nonstd::expected<int, const char*> with_error =
- nonstd::make_unexpected("no value");
+ const tl::expected<int, const char*> with_value = 42;
+ const tl::expected<int, const char*> with_error =
+ tl::unexpected("no value");
CHECK(value_or_throw<TestException>(with_value) == 42);
CHECK_THROWS_WITH(value_or_throw<TestException>(with_error), "no value");
SUBCASE("move")
{
const std::string value = "value";
- nonstd::expected<std::unique_ptr<std::string>, const char*> with_value =
+ tl::expected<std::unique_ptr<std::string>, const char*> with_value =
std::make_unique<std::string>(value);
- const nonstd::expected<int, const char*> with_error =
- nonstd::make_unexpected("no value");
+ const tl::expected<int, const char*> with_error =
+ tl::unexpected("no value");
CHECK(*value_or_throw<TestException>(std::move(with_value)) == value);
CHECK_THROWS_WITH(value_or_throw<TestException>(std::move(with_error)),
SUBCASE("const ref with prefix")
{
- const nonstd::expected<int, const char*> with_value = 42;
- const nonstd::expected<int, const char*> with_error =
- nonstd::make_unexpected("no value");
+ const tl::expected<int, const char*> with_value = 42;
+ const tl::expected<int, const char*> with_error =
+ tl::unexpected("no value");
CHECK(value_or_throw<TestException>(with_value, "prefix: ") == 42);
CHECK_THROWS_WITH(value_or_throw<TestException>(with_error, "prefix: "),
SUBCASE("move with prefix")
{
const std::string value = "value";
- nonstd::expected<std::unique_ptr<std::string>, const char*> with_value =
+ tl::expected<std::unique_ptr<std::string>, const char*> with_value =
std::make_unique<std::string>(value);
- const nonstd::expected<int, const char*> with_error =
- nonstd::make_unexpected("no value");
+ const tl::expected<int, const char*> with_error =
+ tl::unexpected("no value");
CHECK(*value_or_throw<TestException>(std::move(with_value), "prefix: ")
== value);
SUBCASE("void T::value_type")
{
- const nonstd::expected<void, const char*> without_error;
- const nonstd::expected<void, const char*> with_error =
- nonstd::make_unexpected("no value");
+ const tl::expected<void, const char*> without_error;
+ const tl::expected<void, const char*> with_error =
+ tl::unexpected("no value");
CHECK_NOTHROW(throw_on_error<TestException>(without_error));
CHECK_THROWS_WITH(throw_on_error<TestException>(with_error), "no value");
SUBCASE("void T::value_type with prefix")
{
- const nonstd::expected<void, const char*> without_error;
- const nonstd::expected<void, const char*> with_error =
- nonstd::make_unexpected("no value");
+ const tl::expected<void, const char*> without_error;
+ const tl::expected<void, const char*> with_error =
+ tl::unexpected("no value");
CHECK_NOTHROW(throw_on_error<TestException>(without_error, "prefix: "));
CHECK_THROWS_WITH(throw_on_error<TestException>(with_error, "prefix: "),
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