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 | // template<class T> |
12 | // concept input_iterator; |
13 | |
14 | #include <iterator> |
15 | |
16 | #include <concepts> |
17 | |
18 | // clang-format off |
19 | template<std::input_or_output_iterator I> |
20 | requires std::indirectly_readable<I> |
21 | constexpr bool check_subsumption() { |
22 | return false; |
23 | } |
24 | |
25 | template<std::input_iterator> |
26 | constexpr bool check_subsumption() { |
27 | return true; |
28 | } |
29 | // clang-format on |
30 | |
31 | static_assert(check_subsumption<int*>()); |
32 | |