59 lines
2.4 KiB
C++
59 lines
2.4 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
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// ADDITIONAL_COMPILE_FLAGS(gcc-style-warnings): -Wno-ctad-maybe-unsupported
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// <mdspan>
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#include <array>
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#include <cassert>
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#include <cstddef>
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#include <cstdint>
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#include <mdspan>
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#include <span> // dynamic_extent
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#include <utility>
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#include "test_macros.h"
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// mdspan
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// layout_stride::mapping does not have explicit deduction guides,
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// but implicit deduction guides for constructor taking extents and strides
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// should work
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constexpr bool test() {
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constexpr size_t D = std::dynamic_extent;
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ASSERT_SAME_TYPE(decltype(std::layout_stride::mapping(std::extents<int>(), std::array<unsigned, 0>())),
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std::layout_stride::mapping<std::extents<int>>);
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ASSERT_SAME_TYPE(decltype(std::layout_stride::mapping(std::extents<int, 4>(), std::array<char, 1>{1})),
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std::layout_stride::mapping<std::extents<int, 4>>);
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ASSERT_SAME_TYPE(decltype(std::layout_stride::mapping(std::extents<int, D>(), std::array<char, 1>{1})),
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std::layout_stride::mapping<std::extents<int, D>>);
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ASSERT_SAME_TYPE(
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decltype(std::layout_stride::mapping(std::extents<unsigned, D, 3>(), std::array<std::int64_t, 2>{3, 100})),
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std::layout_stride::mapping<std::extents<unsigned, D, 3>>);
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ASSERT_SAME_TYPE(decltype(std::layout_stride::mapping(std::extents<int>(), std::span<unsigned, 0>())),
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std::layout_stride::mapping<std::extents<int>>);
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ASSERT_SAME_TYPE(decltype(std::layout_stride::mapping(std::extents<int, 4>(), std::declval<std::span<char, 1>>())),
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std::layout_stride::mapping<std::extents<int, 4>>);
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ASSERT_SAME_TYPE(decltype(std::layout_stride::mapping(std::extents<int, D>(), std::declval<std::span<char, 1>>())),
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std::layout_stride::mapping<std::extents<int, D>>);
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ASSERT_SAME_TYPE(
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decltype(std::layout_stride::mapping(std::extents<unsigned, D, 3>(), std::declval<std::span<std::int64_t, 2>>())),
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std::layout_stride::mapping<std::extents<unsigned, D, 3>>);
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return true;
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}
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int main(int, char**) {
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test();
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static_assert(test());
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return 0;
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}
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