1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9// UNSUPPORTED: c++03, c++11, c++14, c++17
10
11// constexpr auto size() requires sized_range<V>
12// constexpr auto size() const requires sized_range<const V>
13
14#include <ranges>
15#include <cassert>
16
17#include "test_iterators.h"
18#include "types.h"
19
20template<class View>
21concept SizeEnabled = requires(View v) { v.size(); };
22
23constexpr bool test() {
24 int buf[8] = {1, 2, 3, 4, 5, 6, 7, 8};
25
26 {
27 static_assert( SizeEnabled<std::ranges::common_view<SizedForwardView> const&>);
28 static_assert(!SizeEnabled<std::ranges::common_view<CopyableView> const&>);
29 }
30
31 {
32 SizedForwardView view{buf, buf + 8};
33 std::ranges::common_view<SizedForwardView> common(view);
34 assert(common.size() == 8);
35 }
36
37 {
38 SizedForwardView view{buf, buf + 8};
39 std::ranges::common_view<SizedForwardView> const common(view);
40 assert(common.size() == 8);
41 }
42
43 return true;
44}
45
46int main(int, char**) {
47 test();
48 static_assert(test());
49
50 return 0;
51}
52

source code of libcxx/test/std/ranges/range.adaptors/range.common.view/size.pass.cpp