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