1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
9
10// <mdspan>
11//
12// template<class OtherIndexType, size_t... OtherExtents>
13// friend constexpr bool operator==(const extents& lhs,
14// const extents<OtherIndexType, OtherExtents...>& rhs) noexcept;
15//
16// Returns: true if lhs.rank() equals rhs.rank() and
17// if lhs.extent(r) equals rhs.extent(r) for every rank index r of rhs, otherwise false.
18//
19
20#include <mdspan>
21#include <type_traits>
22#include <concepts>
23#include <cassert>
24
25#include "test_macros.h"
26
27template <class To, class From>
28constexpr void test_comparison(bool equal, To dest, From src) {
29 ASSERT_NOEXCEPT(dest == src);
30 assert((dest == src) == equal);
31 assert((dest != src) == !equal);
32}
33
34template <class T1, class T2>
35constexpr void test_comparison_different_rank() {
36 constexpr size_t D = std::dynamic_extent;
37
38 test_comparison(false, std::extents<T1>(), std::extents<T2, D>(1));
39 test_comparison(false, std::extents<T1>(), std::extents<T2, 1>());
40
41 test_comparison(false, std::extents<T1, D>(1), std::extents<T2>());
42 test_comparison(false, std::extents<T1, 1>(), std::extents<T2>());
43
44 test_comparison(false, std::extents<T1, D>(5), std::extents<T2, D, D>(5, 5));
45 test_comparison(false, std::extents<T1, 5>(), std::extents<T2, 5, D>(5));
46 test_comparison(false, std::extents<T1, 5>(), std::extents<T2, 5, 1>());
47
48 test_comparison(false, std::extents<T1, D, D>(5, 5), std::extents<T2, D>(5));
49 test_comparison(false, std::extents<T1, 5, D>(5), std::extents<T2, D>(5));
50 test_comparison(false, std::extents<T1, 5, 5>(), std::extents<T2, 5>());
51}
52
53template <class T1, class T2>
54constexpr void test_comparison_same_rank() {
55 constexpr size_t D = std::dynamic_extent;
56
57 test_comparison(true, std::extents<T1>(), std::extents<T2>());
58
59 test_comparison(true, std::extents<T1, D>(5), std::extents<T2, D>(5));
60 test_comparison(true, std::extents<T1, 5>(), std::extents<T2, D>(5));
61 test_comparison(true, std::extents<T1, D>(5), std::extents<T2, 5>());
62 test_comparison(true, std::extents<T1, 5>(), std::extents< T2, 5>());
63 test_comparison(false, std::extents<T1, D>(5), std::extents<T2, D>(7));
64 test_comparison(false, std::extents<T1, 5>(), std::extents<T2, D>(7));
65 test_comparison(false, std::extents<T1, D>(5), std::extents<T2, 7>());
66 test_comparison(false, std::extents<T1, 5>(), std::extents<T2, 7>());
67
68 test_comparison(true, std::extents<T1, D, D, D, D, D>(5, 6, 7, 8, 9), std::extents<T2, D, D, D, D, D>(5, 6, 7, 8, 9));
69 test_comparison(true, std::extents<T1, D, 6, D, 8, D>(5, 7, 9), std::extents<T2, 5, D, D, 8, 9>(6, 7));
70 test_comparison(true, std::extents<T1, 5, 6, 7, 8, 9>(5, 6, 7, 8, 9), std::extents<T2, 5, 6, 7, 8, 9>());
71 test_comparison(
72 false, std::extents<T1, D, D, D, D, D>(5, 6, 7, 8, 9), std::extents<T2, D, D, D, D, D>(5, 6, 3, 8, 9));
73 test_comparison(false, std::extents<T1, D, 6, D, 8, D>(5, 7, 9), std::extents<T2, 5, D, D, 3, 9>(6, 7));
74 test_comparison(false, std::extents<T1, 5, 6, 7, 8, 9>(5, 6, 7, 8, 9), std::extents<T2, 5, 6, 7, 3, 9>());
75}
76
77template <class T1, class T2>
78constexpr void test_comparison() {
79 test_comparison_same_rank<T1, T2>();
80 test_comparison_different_rank<T1, T2>();
81}
82
83constexpr bool test() {
84 test_comparison<int, int>();
85 test_comparison<int, size_t>();
86 test_comparison<size_t, int>();
87 test_comparison<size_t, long>();
88 return true;
89}
90
91int main(int, char**) {
92 test();
93 static_assert(test());
94 return 0;
95}
96

source code of libcxx/test/std/containers/views/mdspan/extents/comparison.pass.cpp