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
9// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
10
11// <mdspan>
12
13// Test default construction:
14//
15// constexpr mapping() noexcept = default;
16
17#include <cassert>
18#include <cstddef>
19#include <cstdint>
20#include <mdspan>
21
22#include "test_macros.h"
23
24template <class E>
25constexpr void test_construction() {
26 using M = std::layout_left::mapping<E>;
27 ASSERT_NOEXCEPT(M{});
28 M m;
29 E e;
30
31 // check correct extents are returned
32 ASSERT_NOEXCEPT(m.extents());
33 assert(m.extents() == e);
34
35 // check required_span_size()
36 typename E::index_type expected_size = 1;
37 for (typename E::rank_type r = 0; r < E::rank(); r++)
38 expected_size *= e.extent(r);
39 assert(m.required_span_size() == expected_size);
40}
41
42constexpr bool test() {
43 constexpr size_t D = std::dynamic_extent;
44 test_construction<std::extents<int>>();
45 test_construction<std::extents<unsigned, D>>();
46 test_construction<std::extents<unsigned, 7>>();
47 test_construction<std::extents<unsigned, 7, 8>>();
48 test_construction<std::extents<int64_t, D, 8, D, D>>();
49 return true;
50}
51
52int main(int, char**) {
53 test();
54 static_assert(test());
55 return 0;
56}
57

source code of libcxx/test/std/containers/views/mdspan/layout_left/ctor.default.pass.cpp