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
|
//===----------------------------------------------------------------------===//
//
// 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
// class std::ranges::subrange;
#include <cassert>
#include <ranges>
#include <utility>
#include "test_macros.h"
constexpr void test_sized_subrange()
{
int a[4] = {1,2,3,4};
auto r = std::ranges::subrange(a, a+4);
assert(std::ranges::sized_range<decltype(r)>);
{
auto [first, last] = r;
assert(first == a);
assert(last == a+4);
}
{
auto [first, last] = std::move(r);
assert(first == a);
assert(last == a+4);
}
{
auto [first, last] = std::as_const(r);
assert(first == a);
assert(last == a+4);
}
{
auto [first, last] = std::move(std::as_const(r));
assert(first == a);
assert(last == a+4);
}
}
constexpr void test_unsized_subrange()
{
int a[4] = {1,2,3,4};
auto r = std::ranges::subrange(a, std::unreachable_sentinel);
assert(!std::ranges::sized_range<decltype(r)>);
{
auto [first, last] = r;
assert(first == a);
ASSERT_SAME_TYPE(decltype(last), std::unreachable_sentinel_t);
}
{
auto [first, last] = std::move(r);
assert(first == a);
ASSERT_SAME_TYPE(decltype(last), std::unreachable_sentinel_t);
}
{
auto [first, last] = std::as_const(r);
assert(first == a);
ASSERT_SAME_TYPE(decltype(last), std::unreachable_sentinel_t);
}
{
auto [first, last] = std::move(std::as_const(r));
assert(first == a);
ASSERT_SAME_TYPE(decltype(last), std::unreachable_sentinel_t);
}
}
constexpr void test_copies_not_originals()
{
int a[4] = {1,2,3,4};
{
auto r = std::ranges::subrange(a, a+4);
auto&& [first, last] = r;
ASSERT_SAME_TYPE(decltype(first), int*);
ASSERT_SAME_TYPE(decltype(last), int*);
first = a+2;
last = a+2;
assert(r.begin() == a);
assert(r.end() == a+4);
}
{
const auto r = std::ranges::subrange(a, a+4);
auto&& [first, last] = r;
ASSERT_SAME_TYPE(decltype(first), int*);
ASSERT_SAME_TYPE(decltype(last), int*);
first = a+2;
last = a+2;
assert(r.begin() == a);
assert(r.end() == a+4);
}
}
constexpr bool test()
{
test_sized_subrange();
test_unsized_subrange();
test_copies_not_originals();
return true;
}
int main(int, char**)
{
test();
static_assert(test());
return 0;
}
|
