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
19template<std::input_or_output_iterator I>
20requires std::indirectly_readable<I>
21constexpr bool check_subsumption() {
22 return false;
23}
24
25template<std::input_iterator>
26constexpr bool check_subsumption() {
27 return true;
28}
29// clang-format on
30
31static_assert(check_subsumption<int*>());
32

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