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
17template<std::weakly_incrementable>
18constexpr bool check_subsumption() {
19 return false;
20}
21
22template<std::input_or_output_iterator>
23constexpr bool check_subsumption() {
24 return true;
25}
26// clang-format on
27
28static_assert(check_subsumption<int*>());
29

source code of libcxx/test/std/iterators/iterator.requirements/iterator.concepts/iterator.concept.iterator/subsumption.compile.pass.cpp