59 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// UNSUPPORTED: c++03, c++11, c++14, c++17, c++209// ADDITIONAL_COMPILE_FLAGS(gcc-style-warnings): -Wno-ctad-maybe-unsupported10 11// <mdspan>12 13#include <array>14#include <cassert>15#include <cstddef>16#include <cstdint>17#include <mdspan>18#include <span> // dynamic_extent19#include <utility>20 21#include "test_macros.h"22 23// mdspan24 25// layout_stride::mapping does not have explicit deduction guides,26// but implicit deduction guides for constructor taking extents and strides27// should work28 29constexpr bool test() {30 constexpr size_t D = std::dynamic_extent;31 32 ASSERT_SAME_TYPE(decltype(std::layout_stride::mapping(std::extents<int>(), std::array<unsigned, 0>())),33 std::layout_stride::mapping<std::extents<int>>);34 ASSERT_SAME_TYPE(decltype(std::layout_stride::mapping(std::extents<int, 4>(), std::array<char, 1>{1})),35 std::layout_stride::mapping<std::extents<int, 4>>);36 ASSERT_SAME_TYPE(decltype(std::layout_stride::mapping(std::extents<int, D>(), std::array<char, 1>{1})),37 std::layout_stride::mapping<std::extents<int, D>>);38 ASSERT_SAME_TYPE(39 decltype(std::layout_stride::mapping(std::extents<unsigned, D, 3>(), std::array<std::int64_t, 2>{3, 100})),40 std::layout_stride::mapping<std::extents<unsigned, D, 3>>);41 42 ASSERT_SAME_TYPE(decltype(std::layout_stride::mapping(std::extents<int>(), std::span<unsigned, 0>())),43 std::layout_stride::mapping<std::extents<int>>);44 ASSERT_SAME_TYPE(decltype(std::layout_stride::mapping(std::extents<int, 4>(), std::declval<std::span<char, 1>>())),45 std::layout_stride::mapping<std::extents<int, 4>>);46 ASSERT_SAME_TYPE(decltype(std::layout_stride::mapping(std::extents<int, D>(), std::declval<std::span<char, 1>>())),47 std::layout_stride::mapping<std::extents<int, D>>);48 ASSERT_SAME_TYPE(49 decltype(std::layout_stride::mapping(std::extents<unsigned, D, 3>(), std::declval<std::span<std::int64_t, 2>>())),50 std::layout_stride::mapping<std::extents<unsigned, D, 3>>);51 return true;52}53 54int main(int, char**) {55 test();56 static_assert(test());57 return 0;58}59