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#include <array>
13#include <cassert>
14#include <cstddef>
15#include <mdspan>
16#include <span>
17
18#include "../ConvertibleToIntegral.h"
19#include "test_macros.h"
20
21// Helper file to implement combinatorial testing of extents constructor
22//
23// std::extents can be constructed from just indices, a std::array, or a std::span
24// In each of those cases one can either provide all extents, or just the dynamic ones
25// If constructed from std::span, the span needs to have a static extent
26// Furthermore, the indices/array/span can have integer types other than index_type
27
28template <class E, class AllExtents>
29constexpr void test_runtime_observers(E ext, AllExtents expected) {
30 for (typename E::rank_type r = 0; r < ext.rank(); r++) {
31 ASSERT_SAME_TYPE(decltype(ext.extent(0)), typename E::index_type);
32 ASSERT_NOEXCEPT(ext.extent(0));
33 assert(ext.extent(r) == static_cast<typename E::index_type>(expected[r]));
34 }
35}
36
37template <class E, class AllExtents>
38constexpr void test_implicit_construction_call(E e, AllExtents all_ext) {
39 test_runtime_observers(e, all_ext);
40}
41
42template <class E, class Test, class AllExtents>
43constexpr void test_construction(AllExtents all_ext) {
44 // test construction from all extents
45 Test::template test_construction<E>(all_ext, all_ext, std::make_index_sequence<E::rank()>());
46
47 // test construction from just dynamic extents
48 // create an array of just the extents corresponding to dynamic values
49 std::array<typename AllExtents::value_type, E::rank_dynamic()> dyn_ext{};
50 size_t dynamic_idx = 0;
51 for (size_t r = 0; r < E::rank(); r++) {
52 if (E::static_extent(r) == std::dynamic_extent) {
53 dyn_ext[dynamic_idx] = all_ext[r];
54 dynamic_idx++;
55 }
56 }
57 Test::template test_construction<E>(all_ext, dyn_ext, std::make_index_sequence<E::rank_dynamic()>());
58}
59
60template <class T, class TArg, class Test>
61constexpr void test() {
62 constexpr size_t D = std::dynamic_extent;
63
64 test_construction<std::extents<T>, Test>(std::array<TArg, 0>{});
65
66 test_construction<std::extents<T, 3>, Test>(std::array<TArg, 1>{3});
67 test_construction<std::extents<T, D>, Test>(std::array<TArg, 1>{3});
68
69 test_construction<std::extents<T, 3, 7>, Test>(std::array<TArg, 2>{3, 7});
70 test_construction<std::extents<T, 3, D>, Test>(std::array<TArg, 2>{3, 7});
71 test_construction<std::extents<T, D, 7>, Test>(std::array<TArg, 2>{3, 7});
72 test_construction<std::extents<T, D, D>, Test>(std::array<TArg, 2>{3, 7});
73
74 test_construction<std::extents<T, 3, 7, 9>, Test>(std::array<TArg, 3>{3, 7, 9});
75 test_construction<std::extents<T, 3, 7, D>, Test>(std::array<TArg, 3>{3, 7, 9});
76 test_construction<std::extents<T, 3, D, D>, Test>(std::array<TArg, 3>{3, 7, 9});
77 test_construction<std::extents<T, D, 7, D>, Test>(std::array<TArg, 3>{3, 7, 9});
78 test_construction<std::extents<T, D, D, D>, Test>(std::array<TArg, 3>{3, 7, 9});
79 test_construction<std::extents<T, 3, D, 9>, Test>(std::array<TArg, 3>{3, 7, 9});
80 test_construction<std::extents<T, D, D, 9>, Test>(std::array<TArg, 3>{3, 7, 9});
81 test_construction<std::extents<T, D, 7, 9>, Test>(std::array<TArg, 3>{3, 7, 9});
82
83 test_construction<std::extents<T, 1, 2, 3, 4, 5, 6, 7, 8, 9>, Test>(std::array<TArg, 9>{1, 2, 3, 4, 5, 6, 7, 8, 9});
84 test_construction<std::extents<T, D, 2, 3, D, 5, D, 7, D, 9>, Test>(std::array<TArg, 9>{1, 2, 3, 4, 5, 6, 7, 8, 9});
85 test_construction<std::extents<T, D, D, D, D, D, D, D, D, D>, Test>(std::array<TArg, 9>{1, 2, 3, 4, 5, 6, 7, 8, 9});
86}
87
88template <class Test>
89constexpr bool test_index_type_combo() {
90 test<int, int, Test>();
91 test<int, size_t, Test>();
92 test<unsigned, int, Test>();
93 test<signed char, size_t, Test>();
94 test<long long, unsigned, Test>();
95 test<size_t, int, Test>();
96 test<size_t, size_t, Test>();
97 test<int, IntType, Test>();
98 test<signed char, IntType, Test>();
99 return true;
100}
101

source code of libcxx/test/std/containers/views/mdspan/extents/CtorTestCombinations.h