libcxx/test/std/iterators/iterator.requirements/alg.req.permutable/permutable.subsumption.compile.pass.cpp

   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 I>
  12 //   concept permutable = see below; // Since C++20
  13
  14 #include <iterator>
  15
  16 template<class I> void test_subsumption() requires std::forward_iterator<I>;
  17 template<class I> void test_subsumption() requires std::indirectly_movable_storable<I, I>;
  18 template<class I> void test_subsumption() requires std::indirectly_swappable<I, I>;
  19 template<class I> constexpr bool test_subsumption() requires std::permutable<I> { return true; }
  20 static_assert(test_subsumption<int*>());