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a945c346 | 1 | // Copyright (C) 2021-2024 Free Software Foundation, Inc. |
a25321ca PP |
2 | // |
3 | // This file is part of the GNU ISO C++ Library. This library is free | |
4 | // software; you can redistribute it and/or modify it under the | |
5 | // terms of the GNU General Public License as published by the | |
6 | // Free Software Foundation; either version 3, or (at your option) | |
7 | // any later version. | |
8 | ||
9 | // This library is distributed in the hope that it will be useful, | |
10 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | // GNU General Public License for more details. | |
13 | ||
14 | // You should have received a copy of the GNU General Public License along | |
15 | // with this library; see the file COPYING3. If not see | |
16 | // <http://www.gnu.org/licenses/>. | |
17 | ||
d4ac20b0 | 18 | // { dg-do run { target c++20 } } |
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19 | |
20 | #include <algorithm> | |
21 | #include <ranges> | |
22 | #include <string> | |
23 | #include <string_view> | |
24 | #include <testsuite_hooks.h> | |
25 | ||
26 | namespace ranges = std::ranges; | |
27 | namespace views = std::ranges::views; | |
28 | ||
29 | // Verify P2281 changes to the forwarding semantics of partial application | |
30 | // and composition of range adaptor objects. | |
31 | ||
32 | void | |
33 | test01() | |
34 | { | |
35 | auto split_into_strings = [] (auto p) { | |
adbd2c71 | 36 | return views::lazy_split(p) | views::transform([](auto r){ |
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37 | return std::string(r.begin(), ranges::next(r.begin(), r.end())); |
38 | }); | |
39 | }; | |
40 | constexpr std::string_view s = "hello world"; | |
41 | constexpr std::string_view p = " "; | |
42 | constexpr auto v1 = s | split_into_strings(p); | |
43 | constexpr auto v2 = split_into_strings(p)(s); | |
44 | VERIFY( ranges::equal(v1, (std::string_view[]){"hello", "world"}) ); | |
45 | VERIFY( ranges::equal(v2, (std::string_view[]){"hello", "world"}) ); | |
46 | } | |
47 | ||
48 | struct move_only_range | |
49 | { | |
50 | move_only_range() { } | |
51 | move_only_range(move_only_range&&); | |
52 | move_only_range& operator=(move_only_range&&); | |
53 | move_only_range(const move_only_range&) = delete; | |
54 | move_only_range& operator=(const move_only_range&) = delete; | |
55 | char* begin(); | |
56 | char* end(); | |
57 | }; | |
58 | ||
59 | template<> | |
60 | inline constexpr bool std::ranges::enable_view<move_only_range> = true; | |
61 | ||
adbd2c71 | 62 | template<auto lazy_split = views::lazy_split> |
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63 | void |
64 | test02() | |
65 | { | |
66 | std::string_view s; | |
67 | move_only_range p; | |
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68 | static_assert(requires { s | lazy_split(std::move(p)); }); |
69 | static_assert(requires { lazy_split(std::move(p))(s); }); | |
70 | static_assert(requires { lazy_split(std::move(p)) | views::all; }); | |
71 | static_assert(requires { views::all | lazy_split(std::move(p)); }); | |
72 | static_assert(!requires { lazy_split(p); }); | |
73 | static_assert(!requires { lazy_split(p) | views::all; }); | |
74 | static_assert(!requires { views::all | lazy_split(p); }); | |
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75 | } |
76 | ||
77 | int | |
78 | main() | |
79 | { | |
80 | test01(); | |
81 | test02(); | |
82 | } |