114 lines · cpp
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-exception6//7//===----------------------------------------------------------------------===//8 9// UNSUPPORTED: c++03, c++11, c++14, c++17, c++2010 11// <mdspan>12 13// template<class OtherExtents>14// friend constexpr bool operator==(const mapping& x, const mapping<OtherExtents>& y) noexcept;15// `16// Constraints: extents_type::rank() == OtherExtents::rank() is true.17 18#include <cassert>19#include <cstddef>20#include <mdspan>21 22#include "test_macros.h"23 24template <class To, class From>25constexpr void test_comparison(bool equal, To dest_exts, From src_exts) {26 std::layout_left::mapping<To> dest(dest_exts);27 std::layout_left::mapping<From> src(src_exts);28 ASSERT_NOEXCEPT(dest == src);29 assert((dest == src) == equal);30 assert((dest != src) == !equal);31}32 33struct X {34 constexpr bool does_not_match() { return true; }35};36 37constexpr X compare_layout_mappings(...) { return {}; }38 39template <class E1, class E2>40constexpr auto compare_layout_mappings(E1 e1, E2 e2)41 -> decltype(std::layout_left::mapping<E1>(e1) == std::layout_left::mapping<E2>(e2)) {42 return true;43}44 45template <class T1, class T2>46constexpr void test_comparison_different_rank() {47 constexpr size_t D = std::dynamic_extent;48 49 // sanity check same rank50 static_assert(compare_layout_mappings(std::extents<T1, D>(5), std::extents<T2, D>(5)));51 static_assert(compare_layout_mappings(std::extents<T1, 5>(), std::extents<T2, D>(5)));52 static_assert(compare_layout_mappings(std::extents<T1, D>(5), std::extents<T2, 5>()));53 static_assert(compare_layout_mappings(std::extents<T1, 5>(), std::extents<T2, 5>()));54 55 // not equality comparable when rank is not the same56 static_assert(compare_layout_mappings(std::extents<T1>(), std::extents<T2, D>(1)).does_not_match());57 static_assert(compare_layout_mappings(std::extents<T1>(), std::extents<T2, 1>()).does_not_match());58 59 static_assert(compare_layout_mappings(std::extents<T1, D>(1), std::extents<T2>()).does_not_match());60 static_assert(compare_layout_mappings(std::extents<T1, 1>(), std::extents<T2>()).does_not_match());61 62 static_assert(compare_layout_mappings(std::extents<T1, D>(5), std::extents<T2, D, D>(5, 5)).does_not_match());63 static_assert(compare_layout_mappings(std::extents<T1, 5>(), std::extents<T2, 5, D>(5)).does_not_match());64 static_assert(compare_layout_mappings(std::extents<T1, 5>(), std::extents<T2, 5, 1>()).does_not_match());65 66 static_assert(compare_layout_mappings(std::extents<T1, D, D>(5, 5), std::extents<T2, D>(5)).does_not_match());67 static_assert(compare_layout_mappings(std::extents<T1, 5, D>(5), std::extents<T2, D>(5)).does_not_match());68 static_assert(compare_layout_mappings(std::extents<T1, 5, 5>(), std::extents<T2, 5>()).does_not_match());69}70 71template <class T1, class T2>72constexpr void test_comparison_same_rank() {73 constexpr size_t D = std::dynamic_extent;74 75 test_comparison(true, std::extents<T1>(), std::extents<T2>());76 77 test_comparison(true, std::extents<T1, D>(5), std::extents<T2, D>(5));78 test_comparison(true, std::extents<T1, 5>(), std::extents<T2, D>(5));79 test_comparison(true, std::extents<T1, D>(5), std::extents<T2, 5>());80 test_comparison(true, std::extents<T1, 5>(), std::extents< T2, 5>());81 test_comparison(false, std::extents<T1, D>(5), std::extents<T2, D>(7));82 test_comparison(false, std::extents<T1, 5>(), std::extents<T2, D>(7));83 test_comparison(false, std::extents<T1, D>(5), std::extents<T2, 7>());84 test_comparison(false, std::extents<T1, 5>(), std::extents<T2, 7>());85 86 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));87 test_comparison(true, std::extents<T1, D, 6, D, 8, D>(5, 7, 9), std::extents<T2, 5, D, D, 8, 9>(6, 7));88 test_comparison(true, std::extents<T1, 5, 6, 7, 8, 9>(5, 6, 7, 8, 9), std::extents<T2, 5, 6, 7, 8, 9>());89 test_comparison(90 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));91 test_comparison(false, std::extents<T1, D, 6, D, 8, D>(5, 7, 9), std::extents<T2, 5, D, D, 3, 9>(6, 7));92 test_comparison(false, std::extents<T1, 5, 6, 7, 8, 9>(5, 6, 7, 8, 9), std::extents<T2, 5, 6, 7, 3, 9>());93}94 95template <class T1, class T2>96constexpr void test_comparison() {97 test_comparison_same_rank<T1, T2>();98 test_comparison_different_rank<T1, T2>();99}100 101constexpr bool test() {102 test_comparison<int, int>();103 test_comparison<int, size_t>();104 test_comparison<size_t, int>();105 test_comparison<size_t, long>();106 return true;107}108 109int main(int, char**) {110 test();111 static_assert(test());112 return 0;113}114