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
|
//===----------------------------------------------------------------------===//
//
// 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
// UNSUPPORTED: libcpp-has-no-incomplete-ranges
// constexpr auto end() requires (!simple-view<V>)
// constexpr auto end() const requires range<const V>
#include <ranges>
#include <cassert>
#include "test_macros.h"
#include "test_iterators.h"
#include "test_range.h"
#include "types.h"
constexpr bool test() {
int buffer[8] = {1, 2, 3, 4, 5, 6, 7, 8};
// sized_range && random_access_iterator
{
std::ranges::take_view<SizedRandomAccessView> tv(SizedRandomAccessView{buffer}, 0);
assert(tv.end() == std::ranges::next(tv.begin(), 0));
ASSERT_SAME_TYPE(decltype(tv.end()), RandomAccessIter);
}
{
const std::ranges::take_view<SizedRandomAccessView> tv(SizedRandomAccessView{buffer}, 1);
assert(tv.end() == std::ranges::next(tv.begin(), 1));
ASSERT_SAME_TYPE(decltype(tv.end()), RandomAccessIter);
}
// sized_range && !random_access_iterator
{
std::ranges::take_view<SizedForwardView> tv(SizedForwardView{buffer}, 2);
assert(tv.end() == std::ranges::next(tv.begin(), 2));
ASSERT_SAME_TYPE(decltype(tv.end()), std::default_sentinel_t);
}
{
const std::ranges::take_view<SizedForwardView> tv(SizedForwardView{buffer}, 3);
assert(tv.end() == std::ranges::next(tv.begin(), 3));
ASSERT_SAME_TYPE(decltype(tv.end()), std::default_sentinel_t);
}
// !sized_range
{
std::ranges::take_view<MoveOnlyView> tv(MoveOnlyView{buffer}, 4);
assert(tv.end() == std::ranges::next(tv.begin(), 4));
// The <sentinel> type.
static_assert(!std::same_as<decltype(tv.end()), std::default_sentinel_t>);
static_assert(!std::same_as<decltype(tv.end()), int*>);
}
{
const std::ranges::take_view<MoveOnlyView> tv(MoveOnlyView{buffer}, 5);
assert(tv.end() == std::ranges::next(tv.begin(), 5));
}
// Just to cover the case where count == 8.
{
std::ranges::take_view<SizedRandomAccessView> tv(SizedRandomAccessView{buffer}, 8);
assert(tv.end() == std::ranges::next(tv.begin(), 8));
}
return true;
}
int main(int, char**) {
test();
static_assert(test());
return 0;
}
|
