57 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 9// UNSUPPORTED: c++03, c++11, c++14, c++17, c++2010 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 returned32 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