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7adcbafe | 1 | // Copyright (C) 2019-2022 Free Software Foundation, Inc. |
95e9a761 JM |
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 | ||
18 | // { dg-options "-std=c++2a" } | |
19 | // { dg-do run { target c++2a } } | |
20 | ||
21 | #include <testsuite_hooks.h> | |
22 | ||
23 | #include <span> | |
24 | #include <type_traits> | |
25 | #include <cstdint> | |
26 | #include <vector> | |
27 | #include <algorithm> | |
28 | #include <cassert> | |
29 | ||
30 | int | |
31 | main() | |
32 | { | |
33 | struct alignas(256) strawman | |
34 | { | |
35 | int x; | |
36 | int y; | |
37 | bool z; | |
38 | int w; | |
39 | }; | |
40 | ||
41 | struct naked_span | |
42 | { | |
43 | char* p; | |
44 | std::size_t n; | |
45 | }; | |
46 | ||
47 | struct strawman_span | |
48 | { | |
49 | strawman* p; | |
50 | std::size_t n; | |
51 | }; | |
52 | ||
53 | static_assert(sizeof(std::span<char, 0>) <= sizeof(char*)); | |
54 | static_assert(sizeof(std::span<const char, 0>) <= sizeof(const char*)); | |
55 | static_assert(sizeof(std::span<strawman, 0>) <= sizeof(strawman*)); | |
56 | static_assert(sizeof(std::span<strawman, 1>) <= sizeof(strawman*)); | |
57 | static_assert(sizeof(std::span<char>) <= sizeof(naked_span)); | |
58 | static_assert(sizeof(std::span<strawman>) <= sizeof(strawman_span)); | |
59 | ||
60 | constexpr static std::array<int, 9> arr_data{ 0, 1, 2, 3, 4, 5, 6, 7, 8 }; | |
61 | constexpr auto arr_data_span = std::span(arr_data); | |
62 | static_assert(arr_data_span.size() == 9); | |
63 | static_assert(arr_data_span.size_bytes() == 9 * sizeof(int)); | |
64 | static_assert(*arr_data_span.begin() == 0); | |
65 | static_assert(*arr_data_span.data() == 0); | |
66 | static_assert(arr_data_span.front() == 0); | |
67 | static_assert(arr_data_span.back() == 8); | |
68 | static_assert(arr_data_span[0] == 0); | |
69 | static_assert(arr_data_span[1] == 1); | |
70 | static_assert(arr_data_span[2] == 2); | |
71 | static_assert(arr_data_span[3] == 3); | |
72 | static_assert(arr_data_span[4] == 4); | |
73 | static_assert(arr_data_span[5] == 5); | |
74 | static_assert(arr_data_span[6] == 6); | |
75 | static_assert(arr_data_span[7] == 7); | |
76 | static_assert(arr_data_span[8] == 8); | |
77 | static_assert(!arr_data_span.empty()); | |
78 | static_assert(decltype(arr_data_span)::extent == 9); | |
79 | ||
80 | constexpr static int data[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8 }; | |
81 | constexpr auto data_span = std::span(data); | |
82 | static_assert(data_span.size() == 9); | |
83 | static_assert(data_span.size_bytes() == 9 * sizeof(int)); | |
84 | static_assert(*data_span.begin() == 0); | |
85 | static_assert(*data_span.data() == 0); | |
86 | static_assert(data_span.front() == 0); | |
87 | static_assert(data_span.back() == 8); | |
88 | static_assert(data_span[0] == 0); | |
89 | static_assert(data_span[1] == 1); | |
90 | static_assert(data_span[2] == 2); | |
91 | static_assert(data_span[3] == 3); | |
92 | static_assert(data_span[4] == 4); | |
93 | static_assert(data_span[5] == 5); | |
94 | static_assert(data_span[6] == 6); | |
95 | static_assert(data_span[7] == 7); | |
96 | static_assert(data_span[8] == 8); | |
97 | static_assert(!data_span.empty()); | |
98 | static_assert(decltype(data_span)::extent == 9); | |
99 | ||
100 | constexpr auto data_span_first = data_span.first<3>(); | |
101 | static_assert( | |
102 | std::is_same_v<std::remove_cv_t<decltype(data_span_first)>, std::span<const int, 3>>); | |
103 | static_assert(decltype(data_span_first)::extent == 3); | |
104 | static_assert(data_span_first.size() == 3); | |
105 | static_assert(data_span_first.front() == 0); | |
106 | static_assert(data_span_first.back() == 2); | |
95e9a761 JM |
107 | |
108 | constexpr auto data_span_first_dyn = data_span.first(4); | |
109 | static_assert( | |
110 | std::is_same_v<std::remove_cv_t<decltype(data_span_first_dyn)>, std::span<const int>>); | |
111 | static_assert(decltype(data_span_first_dyn)::extent == std::dynamic_extent); | |
112 | static_assert(data_span_first_dyn.size() == 4); | |
113 | static_assert(data_span_first_dyn.front() == 0); | |
114 | static_assert(data_span_first_dyn.back() == 3); | |
115 | ||
116 | constexpr auto data_span_last = data_span.last<5>(); | |
117 | static_assert( | |
118 | std::is_same_v<std::remove_cv_t<decltype(data_span_last)>, std::span<const int, 5>>); | |
119 | static_assert(decltype(data_span_last)::extent == 5); | |
120 | static_assert(data_span_last.size() == 5); | |
121 | static_assert(data_span_last.front() == 4); | |
122 | static_assert(data_span_last.back() == 8); | |
95e9a761 JM |
123 | |
124 | constexpr auto data_span_last_dyn = data_span.last(6); | |
125 | static_assert( | |
126 | std::is_same_v<std::remove_cv_t<decltype(data_span_last_dyn)>, std::span<const int>>); | |
127 | static_assert(decltype(data_span_last_dyn)::extent == std::dynamic_extent); | |
128 | static_assert(data_span_last_dyn.size() == 6); | |
129 | static_assert(data_span_last_dyn.front() == 3); | |
130 | static_assert(data_span_last_dyn.back() == 8); | |
131 | ||
132 | constexpr auto data_span_subspan = data_span.subspan<1, 3>(); | |
133 | static_assert( | |
134 | std::is_same_v<std::remove_cv_t<decltype(data_span_subspan)>, std::span<const int, 3>>); | |
135 | static_assert(decltype(data_span_subspan)::extent == 3); | |
136 | static_assert(data_span_subspan.size() == 3); | |
137 | static_assert(data_span_subspan.front() == 1); | |
138 | static_assert(data_span_subspan.back() == 3); | |
139 | ||
140 | constexpr auto data_span_subspan_offset = data_span.subspan<8>(); | |
141 | static_assert( | |
142 | std::is_same_v<std::remove_cv_t<decltype(data_span_subspan_offset)>, std::span<const int, 1>>); | |
143 | static_assert(decltype(data_span_subspan_offset)::extent == 1); | |
144 | static_assert(data_span_subspan_offset.size() == 1); | |
145 | static_assert(data_span_subspan_offset.front() == 8); | |
146 | static_assert(data_span_subspan_offset.back() == 8); | |
147 | ||
148 | constexpr auto data_span_subspan_empty = data_span.subspan(9, 0); | |
149 | static_assert( | |
150 | std::is_same_v<std::remove_cv_t<decltype(data_span_subspan_empty)>, std::span<const int>>); | |
151 | static_assert(decltype(data_span_subspan_empty)::extent == std::dynamic_extent); | |
152 | static_assert(data_span_subspan_empty.size() == 0); | |
153 | ||
154 | constexpr auto data_span_subspan_empty_static = data_span.subspan<9>(); | |
155 | static_assert(std::is_same_v<std::remove_cv_t<decltype(data_span_subspan_empty_static)>, | |
156 | std::span<const int, 0>>); | |
157 | static_assert(decltype(data_span_subspan_empty_static)::extent == 0); | |
158 | static_assert(data_span_subspan_empty.size() == 0); | |
159 | ||
160 | std::span<short> shorts{}; | |
161 | bool really_empty0 = shorts.empty(); | |
162 | bool really_empty1 = std::empty(shorts); | |
163 | bool really_empty2 = shorts.data() == nullptr; | |
164 | bool really_empty3 = shorts.begin() == shorts.end(); | |
95e9a761 | 165 | bool really_empty = |
247f410b | 166 | really_empty0 && really_empty1 && really_empty2 && really_empty3; |
95e9a761 JM |
167 | (void)really_empty; |
168 | VERIFY(really_empty); | |
169 | ||
170 | std::vector<std::int_least32_t> value{ 0 }; | |
171 | std::span<int32_t> muh_span(value); | |
172 | VERIFY(muh_span.size() == 1); | |
173 | std::byte* original_bytes = reinterpret_cast<std::byte*>(value.data()); | |
174 | original_bytes[0] = static_cast<std::byte>(1); | |
175 | original_bytes[1] = static_cast<std::byte>(2); | |
176 | original_bytes[2] = static_cast<std::byte>(3); | |
177 | original_bytes[3] = static_cast<std::byte>(4); | |
178 | std::span<const std::byte> muh_byte_span = std::as_bytes(muh_span); | |
179 | std::span<std::byte> muh_mutable_byte_span = std::as_writable_bytes(muh_span); | |
180 | std::span<std::byte> muh_original_byte_span(original_bytes, original_bytes + 4); | |
247f410b JW |
181 | bool definitely_reinterpret_casted0 = std::equal(muh_byte_span.begin(), muh_byte_span.end(), |
182 | muh_original_byte_span.begin(), muh_original_byte_span.end()); | |
183 | bool definitely_reinterpret_casted1 = std::equal(muh_mutable_byte_span.begin(), | |
184 | muh_mutable_byte_span.end(), muh_original_byte_span.begin(), muh_original_byte_span.end()); | |
95e9a761 JM |
185 | bool definitely_reinterpret_casted = |
186 | definitely_reinterpret_casted0 && definitely_reinterpret_casted1; | |
187 | (void)definitely_reinterpret_casted; | |
188 | VERIFY(definitely_reinterpret_casted); | |
189 | ||
190 | std::span<std::byte> muh_original_byte_span_ptr_size(original_bytes, 4); | |
191 | bool definitely_equivalent = | |
247f410b JW |
192 | std::equal(muh_original_byte_span_ptr_size.begin(), muh_original_byte_span_ptr_size.end(), |
193 | muh_original_byte_span.begin(), muh_original_byte_span.end()); | |
95e9a761 JM |
194 | (void)definitely_equivalent; |
195 | VERIFY(definitely_equivalent); | |
196 | ||
197 | return definitely_equivalent && definitely_reinterpret_casted && really_empty ? 0 : 1; | |
198 | } |