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 I1, class I2>
12 // concept indirectly_swappable;
13 
14 #include <iterator>
15 
16 #include <concepts>
17 
18 template<class I1, class I2>
19   requires std::indirectly_readable<I1> && std::indirectly_readable<I2>
indirectly_swappable_subsumption()20 constexpr bool indirectly_swappable_subsumption() {
21   return false;
22 }
23 
24 template<class I1, class I2>
25   requires std::indirectly_swappable<I1, I2>
indirectly_swappable_subsumption()26 constexpr bool indirectly_swappable_subsumption() {
27   return true;
28 }
29 
30 static_assert(indirectly_swappable_subsumption<int*, int*>());
31