1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
|
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
// <mdspan>
// template<class OtherExtents>
// constexpr explicit(extents_type::rank() > 0)
// mapping(const layout_stride::mapping<OtherExtents>& other);
//
// Constraints: is_constructible_v<extents_type, OtherExtents> is true.
//
// Preconditions:
// - If extents_type::rank() > 0 is true, then for all r in the range [0, extents_type::rank()),
// other.stride(r) equals other.extents().fwd-prod-of-extents(r), and
// - other.required_span_size() is representable as a value of type index_type ([basic.fundamental]).
//
// Effects: Direct-non-list-initializes extents_ with other.extents().
#include <mdspan>
#include <type_traits>
#include <cassert>
#include <limits>
#include "test_macros.h"
template <bool implicit, class ToE, class FromE>
constexpr void test_conversion(FromE src_exts) {
using To = std::layout_left::mapping<ToE>;
using From = std::layout_stride::mapping<FromE>;
std::array<typename FromE::index_type, FromE::rank()> strides;
if constexpr (FromE::rank() > 0) {
strides[0] = 1;
for (size_t r = 1; r < FromE::rank(); r++)
strides[r] = src_exts.extent(r - 1) * strides[r - 1];
}
From src(src_exts, strides);
ASSERT_NOEXCEPT(To(src));
To dest(src);
assert(dest == src);
if constexpr (implicit) {
To dest_implicit = src;
assert(dest_implicit == src);
} else {
assert((!std::is_convertible_v<From, To>));
}
}
template <class T1, class T2>
constexpr void test_conversion() {
constexpr size_t D = std::dynamic_extent;
// clang-format off
test_conversion<true, std::extents<T1>>(std::extents<T2>());
test_conversion<false, std::extents<T1, D>>(std::extents<T2, D>(5));
test_conversion<false, std::extents<T1, 5>>(std::extents<T2, D>(5));
test_conversion<false, std::extents<T1, 5>>(std::extents<T2, 5>());
test_conversion<false, std::extents<T1, 5, D>>(std::extents<T2, D, D>(5, 5));
test_conversion<false, std::extents<T1, D, D>>(std::extents<T2, D, D>(5, 5));
test_conversion<false, std::extents<T1, D, D>>(std::extents<T2, D, 7>(5));
test_conversion<false, std::extents<T1, 5, 7>>(std::extents<T2, 5, 7>());
test_conversion<false, std::extents<T1, 5, D, 8, D, D>>(std::extents<T2, D, D, 8, 9, 1>(5, 7));
test_conversion<false, std::extents<T1, D, D, D, D, D>>(
std::extents<T2, D, D, D, D, D>(5, 7, 8, 9, 1));
test_conversion<false, std::extents<T1, D, D, 8, 9, D>>(std::extents<T2, D, 7, 8, 9, 1>(5));
test_conversion<false, std::extents<T1, 5, 7, 8, 9, 1>>(std::extents<T2, 5, 7, 8, 9, 1>());
// clang-format on
}
template <class IdxT, size_t... Extents>
using ll_mapping_t = std::layout_left::mapping<std::extents<IdxT, Extents...>>;
template <class IdxT, size_t... Extents>
using ls_mapping_t = std::layout_stride::mapping<std::extents<IdxT, Extents...>>;
constexpr void test_rank_mismatch() {
constexpr size_t D = std::dynamic_extent;
static_assert(!std::is_constructible_v<ll_mapping_t<int, D>, ls_mapping_t<int>>);
static_assert(!std::is_constructible_v<ll_mapping_t<int>, ls_mapping_t<int, D, D>>);
static_assert(!std::is_constructible_v<ll_mapping_t<int, D>, ls_mapping_t<int, D, D>>);
static_assert(!std::is_constructible_v<ll_mapping_t<int, D, D, D>, ls_mapping_t<int, D, D>>);
}
constexpr void test_static_extent_mismatch() {
constexpr size_t D = std::dynamic_extent;
static_assert(!std::is_constructible_v<ll_mapping_t<int, D, 5>, ls_mapping_t<int, D, 4>>);
static_assert(!std::is_constructible_v<ll_mapping_t<int, 5>, ls_mapping_t<int, 4>>);
static_assert(!std::is_constructible_v<ll_mapping_t<int, 5, D>, ls_mapping_t<int, 4, D>>);
}
constexpr bool test() {
test_conversion<int, int>();
test_conversion<int, size_t>();
test_conversion<size_t, int>();
test_conversion<size_t, long>();
test_rank_mismatch();
test_static_extent_mismatch();
return true;
}
int main(int, char**) {
test();
static_assert(test());
return 0;
}
|
