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
16 #include "test_macros.h"
17 #include "types.h"
18
19 template<class T>
20 concept SizeInvocable = requires(T t) { t.size(); };
21
test()22 constexpr bool test() {
23 {
24 std::ranges::transform_view transformView(MoveOnlyView{}, PlusOne{});
25 assert(transformView.size() == 8);
26 }
27
28 {
29 const std::ranges::transform_view transformView(MoveOnlyView{globalBuff, 4}, PlusOne{});
30 assert(transformView.size() == 4);
31 }
32
33 static_assert(!SizeInvocable<std::ranges::transform_view<ForwardView, PlusOne>>);
34
35 static_assert(SizeInvocable<std::ranges::transform_view<SizedSentinelNotConstView, PlusOne>>);
36 static_assert(!SizeInvocable<const std::ranges::transform_view<SizedSentinelNotConstView, PlusOne>>);
37
38 return true;
39 }
40
main(int,char **)41 int main(int, char**) {
42 test();
43 static_assert(test());
44
45 return 0;
46 }
47