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-exception
6//
7//===----------------------------------------------------------------------===//
8// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20, c++23
9
10// <mdspan>
11
12// template<size_t Rank, class IndexType = size_t>
13// using dims = see below;
14//
15// Result: A type E that is a specialization of extents such that
16// E::rank() == Rank && E::rank() == E::rank_dynamic() is true,
17// and E::index_type denotes IndexType.
18
19#include <mdspan>
20#include <cstddef>
21
22#include "test_macros.h"
23
24template <class IndexType>
25void test_alias_template_dims() {
26 constexpr size_t D = std::dynamic_extent;
27 ASSERT_SAME_TYPE(std::dims<0, IndexType>, std::extents<IndexType>);
28 ASSERT_SAME_TYPE(std::dims<1, IndexType>, std::extents<IndexType, D>);
29 ASSERT_SAME_TYPE(std::dims<2, IndexType>, std::extents<IndexType, D, D>);
30 ASSERT_SAME_TYPE(std::dims<3, IndexType>, std::extents<IndexType, D, D, D>);
31 ASSERT_SAME_TYPE(std::dims<9, IndexType>, std::extents<IndexType, D, D, D, D, D, D, D, D, D>);
32}
33
34template <>
35void test_alias_template_dims<size_t>() {
36 constexpr size_t D = std::dynamic_extent;
37 ASSERT_SAME_TYPE(std::dims<0>, std::extents<size_t>);
38 ASSERT_SAME_TYPE(std::dims<1>, std::extents<size_t, D>);
39 ASSERT_SAME_TYPE(std::dims<2>, std::extents<size_t, D, D>);
40 ASSERT_SAME_TYPE(std::dims<3>, std::extents<size_t, D, D, D>);
41 ASSERT_SAME_TYPE(std::dims<9>, std::extents<size_t, D, D, D, D, D, D, D, D, D>);
42}
43
44int main(int, char**) {
45 test_alias_template_dims<int>();
46 test_alias_template_dims<unsigned int>();
47 test_alias_template_dims<size_t>();
48 return 0;
49}
50

source code of libcxx/test/std/containers/views/mdspan/extents/dims.pass.cpp