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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 OtherMapping>14//   friend constexpr bool operator==(const mapping& x, const OtherMapping& y) noexcept;15//16// Constraints:17//   - layout-mapping-alike<OtherMapping> is satisfied.18//   - rank_ == OtherMapping::extents_type::rank() is true.19//   - OtherMapping::is_always_strided() is true.20//21// Preconditions: OtherMapping meets the layout mapping requirements ([mdspan.layout.policy.reqmts]).22//23// Returns: true if x.extents() == y.extents() is true, OFFSET(y) == 0 is true, and each of x.stride(r) == y.stride(r) is true for r in the range [0, x.extents().rank()). Otherwise, false.24 25#include <mdspan>26#include <cassert>27#include <concepts>28#include <type_traits>29 30#include "test_macros.h"31 32#include "../CustomTestLayouts.h"33 34template <class E1, class E2>35concept layout_mapping_comparable = requires(36    E1 e1,37    E2 e2,38    std::array<typename E1::index_type, E1::rank()> s1,39    std::array<typename E1::index_type, E1::rank()> s2) {40  std::layout_stride::mapping<E1>(e1, s1) == std::layout_stride::mapping<E2>(e2, s2);41};42 43template <class T1, class T2>44constexpr void test_comparison_different_rank() {45  constexpr size_t D = std::dynamic_extent;46 47  // sanity check same rank48  static_assert(layout_mapping_comparable<std::extents<T1, D>, std::extents<T2, D>>);49  static_assert(layout_mapping_comparable<std::extents<T1, 5>, std::extents<T2, D>>);50  static_assert(layout_mapping_comparable<std::extents<T1, D>, std::extents<T2, 5>>);51  static_assert(layout_mapping_comparable<std::extents<T1, 5>, std::extents<T2, 5>>);52 53  // not equality comparable when rank is not the same54  static_assert(!layout_mapping_comparable<std::extents<T1>, std::extents<T2, D>>);55  static_assert(!layout_mapping_comparable<std::extents<T1>, std::extents<T2, 1>>);56  static_assert(!layout_mapping_comparable<std::extents<T1, D>, std::extents<T2>>);57  static_assert(!layout_mapping_comparable<std::extents<T1, 1>, std::extents<T2>>);58  static_assert(!layout_mapping_comparable<std::extents<T1, D>, std::extents<T2, D, D>>);59  static_assert(!layout_mapping_comparable<std::extents<T1, 5>, std::extents<T2, 5, D>>);60  static_assert(!layout_mapping_comparable<std::extents<T1, 5>, std::extents<T2, 5, 1>>);61  static_assert(!layout_mapping_comparable<std::extents<T1, D, D>, std::extents<T2, D>>);62  static_assert(!layout_mapping_comparable<std::extents<T1, 5, D>, std::extents<T2, 5>>);63  static_assert(!layout_mapping_comparable<std::extents<T1, 5, 1>, std::extents<T2, 5>>);64}65 66template <class To, class From>67constexpr void test_comparison(68    bool equal,69    To dest_exts,70    From src_exts,71    std::array<int, To::rank()> dest_strides,72    std::array<int, From::rank()> src_strides) {73  std::layout_stride::mapping<To> dest(dest_exts, dest_strides);74  std::layout_stride::mapping<From> src(src_exts, src_strides);75  ASSERT_NOEXCEPT(dest == src);76  assert((dest == src) == equal);77  assert((dest != src) == !equal);78}79 80template <class T1, class T2>81constexpr void test_comparison_same_rank() {82  constexpr size_t D = std::dynamic_extent;83 84  test_comparison(true, std::extents<T1>(), std::extents<T2>(), std::array<int, 0>{}, std::array<int, 0>{});85 86  test_comparison(true, std::extents<T1, D>(5), std::extents<T2, D>(5), std::array<int, 1>{1}, std::array<int, 1>{1});87  test_comparison(true, std::extents<T1, D>(0), std::extents<T2, D>(0), std::array<int, 1>{1}, std::array<int, 1>{1});88  test_comparison(true, std::extents<T1, 5>(), std::extents<T2, D>(5), std::array<int, 1>{3}, std::array<int, 1>{3});89  test_comparison(true, std::extents<T1, D>(5), std::extents<T2, 5>(), std::array<int, 1>{1}, std::array<int, 1>{1});90  test_comparison(true, std::extents<T1, 5>(), std::extents< T2, 5>(), std::array<int, 1>{1}, std::array<int, 1>{1});91  test_comparison(false, std::extents<T1, 5>(), std::extents<T2, D>(5), std::array<int, 1>{2}, std::array<int, 1>{1});92  test_comparison(false, std::extents<T1, D>(5), std::extents<T2, D>(5), std::array<int, 1>{2}, std::array<int, 1>{1});93  test_comparison(false, std::extents<T1, D>(5), std::extents<T2, D>(7), std::array<int, 1>{1}, std::array<int, 1>{1});94  test_comparison(false, std::extents<T1, 5>(), std::extents<T2, D>(7), std::array<int, 1>{1}, std::array<int, 1>{1});95  test_comparison(false, std::extents<T1, D>(5), std::extents<T2, 7>(), std::array<int, 1>{1}, std::array<int, 1>{1});96  test_comparison(false, std::extents<T1, 5>(), std::extents<T2, 7>(), std::array<int, 1>{1}, std::array<int, 1>{1});97 98  test_comparison(99      true,100      std::extents<T1, D, D, D, D, D>(5, 6, 7, 8, 9),101      std::extents<T2, D, D, D, D, D>(5, 6, 7, 8, 9),102      std::array<int, 5>{2, 20, 200, 2000, 20000},103      std::array<int, 5>{2, 20, 200, 2000, 20000});104  test_comparison(105      true,106      std::extents<T1, D, 6, D, 8, D>(5, 7, 9),107      std::extents<T2, 5, D, D, 8, 9>(6, 7),108      std::array<int, 5>{2, 20, 200, 2000, 20000},109      std::array<int, 5>{2, 20, 200, 2000, 20000});110  test_comparison(111      true,112      std::extents<T1, 5, 6, 7, 8, 9>(5, 6, 7, 8, 9),113      std::extents<T2, 5, 6, 7, 8, 9>(),114      std::array<int, 5>{2, 20, 200, 2000, 20000},115      std::array<int, 5>{2, 20, 200, 2000, 20000});116  test_comparison(117      false,118      std::extents<T1, 5, 6, 7, 8, 9>(5, 6, 7, 8, 9),119      std::extents<T2, 5, 6, 7, 8, 9>(),120      std::array<int, 5>{2, 20, 200, 20000, 2000},121      std::array<int, 5>{2, 20, 200, 2000, 20000});122  test_comparison(123      false,124      std::extents<T1, D, D, D, D, D>(5, 6, 7, 8, 9),125      std::extents<T2, D, D, D, D, D>(5, 6, 3, 8, 9),126      std::array<int, 5>{2, 20, 200, 2000, 20000},127      std::array<int, 5>{2, 20, 200, 2000, 20000});128  test_comparison(129      false,130      std::extents<T1, D, 6, D, 8, D>(5, 7, 9),131      std::extents<T2, 5, D, D, 3, 9>(6, 7),132      std::array<int, 5>{2, 20, 200, 2000, 20000},133      std::array<int, 5>{2, 20, 200, 2000, 20000});134  test_comparison(135      false,136      std::extents<T1, 5, 6, 7, 8, 9>(5, 6, 7, 8, 9),137      std::extents<T2, 5, 6, 7, 3, 9>(),138      std::array<int, 5>{2, 20, 200, 2000, 20000},139      std::array<int, 5>{2, 20, 200, 2000, 20000});140}141 142template <class OtherLayout, class E1, class E2, class... OtherArgs>143constexpr void test_comparison_with(144    bool expect_equal, E1 e1, std::array<typename E1::index_type, E1::rank()> strides, E2 e2, OtherArgs... other_args) {145  std::layout_stride::mapping<E1> map(e1, strides);146  typename OtherLayout::template mapping<E2> other_map(e2, other_args...);147 148  assert((map == other_map) == expect_equal);149}150 151template <class OtherLayout>152constexpr void test_comparison_with() {153  constexpr size_t D = std::dynamic_extent;154  bool is_left_based =155      std::is_same_v<OtherLayout, std::layout_left> || std::is_same_v<OtherLayout, always_convertible_layout>;156  test_comparison_with<OtherLayout>(true, std::extents<int>(), std::array<int, 0>{}, std::extents<unsigned>());157  test_comparison_with<OtherLayout>(true, std::extents<int, 5>(), std::array<int, 1>{1}, std::extents<unsigned, 5>());158  test_comparison_with<OtherLayout>(true, std::extents<int, D>(5), std::array<int, 1>{1}, std::extents<unsigned, 5>());159  test_comparison_with<OtherLayout>(false, std::extents<int, D>(5), std::array<int, 1>{2}, std::extents<unsigned, 5>());160  test_comparison_with<OtherLayout>(161      is_left_based, std::extents<int, D, D>(5, 7), std::array<int, 2>{1, 5}, std::extents<unsigned, D, D>(5, 7));162  test_comparison_with<OtherLayout>(163      !is_left_based, std::extents<int, D, D>(5, 7), std::array<int, 2>{7, 1}, std::extents<unsigned, D, D>(5, 7));164  test_comparison_with<OtherLayout>(165      false, std::extents<int, D, D>(5, 7), std::array<int, 2>{8, 1}, std::extents<unsigned, D, D>(5, 7));166 167  if constexpr (std::is_same_v<OtherLayout, always_convertible_layout>) {168    // test layout with strides not equal to product of extents169    test_comparison_with<OtherLayout>(170        true, std::extents<int, D, D>(5, 7), std::array<int, 2>{2, 10}, std::extents<unsigned, D, D>(5, 7), 0, 2);171    // make sure that offset != 0 results in false172    test_comparison_with<OtherLayout>(173        false, std::extents<int, D, D>(5, 7), std::array<int, 2>{2, 10}, std::extents<unsigned, D, D>(5, 7), 1, 2);174  }175}176 177template <class T1, class T2>178constexpr void test_comparison_index_type() {179  test_comparison_same_rank<T1, T2>();180  test_comparison_different_rank<T1, T2>();181  test_comparison_with<std::layout_right>();182  test_comparison_with<std::layout_left>();183  test_comparison_with<always_convertible_layout>();184}185 186constexpr bool test() {187  test_comparison_index_type<int, int>();188  test_comparison_index_type<int, size_t>();189  test_comparison_index_type<size_t, int>();190  test_comparison_index_type<size_t, long>();191  return true;192}193 194int main(int, char**) {195  test();196  static_assert(test());197  return 0;198}199