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