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
|
//===----------------------------------------------------------------------===//
//
// 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
// template<different-from<subrange> PairLike>
// requires pair-like-convertible-from<PairLike, const I&, const S&>
// constexpr operator PairLike() const;
#include <array>
#include <cassert>
#include <concepts>
#include <ranges>
#include <utility>
#include "test_macros.h"
static_assert(std::convertible_to<std::ranges::subrange<int*>, std::pair<int*, int*>>);
static_assert(std::convertible_to<std::ranges::subrange<int*>, std::tuple<int*, int*>>);
static_assert(!std::convertible_to<std::ranges::subrange<int*>, std::pair<long*, int*>>);
static_assert(!std::convertible_to<std::ranges::subrange<int*>, std::pair<int*, long*>>);
static_assert(!std::convertible_to<std::ranges::subrange<int*>, std::pair<long*, long*>>);
static_assert(!std::convertible_to<std::ranges::subrange<int*>, std::array<int*, 2>>);
constexpr bool test() {
// Check to std::pair
{
int data[] = {1, 2, 3, 4, 5};
const std::ranges::subrange a(data);
{
std::pair<int*, int*> p(a);
assert(p.first == data + 0);
assert(p.second == data + 5);
}
{
std::pair<int*, int*> p{a};
assert(p.first == data + 0);
assert(p.second == data + 5);
}
{
std::pair<int*, int*> p = a;
assert(p.first == data + 0);
assert(p.second == data + 5);
}
}
// Check to std::tuple
{
int data[] = {1, 2, 3, 4, 5};
const std::ranges::subrange a(data);
{
std::tuple<int*, int*> p(a);
assert(std::get<0>(p) == data + 0);
assert(std::get<1>(p) == data + 5);
}
{
std::tuple<int*, int*> p{a};
assert(std::get<0>(p) == data + 0);
assert(std::get<1>(p) == data + 5);
}
{
std::tuple<int*, int*> p = a;
assert(std::get<0>(p) == data + 0);
assert(std::get<1>(p) == data + 5);
}
}
return true;
}
int main(int, char**) {
test();
static_assert(test());
return 0;
}
|
