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
|
//===----------------------------------------------------------------------===//
//
// 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
// constexpr auto size()
// requires sized_range<V>
// constexpr auto size() const
// requires sized_range<const V>
#include <ranges>
#include "test_macros.h"
#include "types.h"
template<class T>
concept SizeInvocable = requires(std::ranges::drop_view<T> t) { t.size(); };
constexpr bool test() {
// sized_range<V>
std::ranges::drop_view dropView1(MoveOnlyView(), 4);
assert(dropView1.size() == 4);
// sized_range<V>
std::ranges::drop_view dropView2(MoveOnlyView(), 0);
assert(dropView2.size() == 8);
// sized_range<const V>
const std::ranges::drop_view dropView3(MoveOnlyView(), 8);
assert(dropView3.size() == 0);
// sized_range<const V>
const std::ranges::drop_view dropView4(MoveOnlyView(), 10);
assert(dropView4.size() == 0);
// Because ForwardView is not a sized_range.
static_assert(!SizeInvocable<ForwardView>);
return true;
}
int main(int, char**) {
test();
static_assert(test());
return 0;
}
|
