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 // UNSUPPORTED: libcpp-no-concepts 11 12 // template<class T> 13 // concept input_iterator; 14 15 #include <iterator> 16 17 #include <concepts> 18 19 // clang-format off 20 template<std::input_or_output_iterator I> 21 requires std::indirectly_readable<I> check_subsumption()22constexpr bool check_subsumption() { 23 return false; 24 } 25 26 template<std::input_iterator> check_subsumption()27constexpr bool check_subsumption() { 28 return true; 29 } 30 // clang-format on 31 32 static_assert(check_subsumption<int*>()); 33