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
9
10 // <mdspan>
11
12 // Test default construction:
13 //
14 // constexpr extents() noexcept = default;
15 //
16 // Remarks: since the standard uses an exposition only array member, dynamic extents
17 // need to be zero initialized!
18
19 #include <mdspan>
20 #include <cassert>
21 #include <array>
22
23 #include "../ConvertibleToIntegral.h"
24 #include "CtorTestCombinations.h"
25 #include "test_macros.h"
26
27 struct DefaultCtorTest {
28 template <class E, class AllExtents, class Extents, size_t... Indices>
test_constructionDefaultCtorTest29 static constexpr void test_construction(AllExtents all_ext, Extents, std::index_sequence<Indices...>) {
30 // This function gets called twice: once with Extents being just the dynamic ones, and once with all the extents specified.
31 // We only test during the all extent case, since then Indices is the correct number. This allows us to reuse the same
32 // testing machinery used in other constructor tests.
33 if constexpr (sizeof...(Indices) == E::rank()) {
34 ASSERT_NOEXCEPT(E{});
35 // Need to construct new expected values, replacing dynamic values with 0
36 std::array<typename AllExtents::value_type, E::rank()> expected_exts{
37 ((E::static_extent(Indices) == std::dynamic_extent)
38 ? typename AllExtents::value_type(0)
39 : all_ext[Indices])...};
40 test_runtime_observers(E{}, expected_exts);
41 }
42 }
43 };
44
main(int,char **)45 int main(int, char**) {
46 test_index_type_combo<DefaultCtorTest>();
47 static_assert(test_index_type_combo<DefaultCtorTest>());
48 return 0;
49 }
50