1 // -*- C++ -*- 2 //===----------------------------------------------------------------------===// 3 // 4 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5 // See https://llvm.org/LICENSE.txt for license information. 6 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 7 // 8 //===----------------------------------------------------------------------===// 9 10 #ifndef _LIBCPP___ITERATOR_PERMUTABLE_H 11 #define _LIBCPP___ITERATOR_PERMUTABLE_H 12 13 #include <__config> 14 #include <__iterator/concepts.h> 15 #include <__iterator/iter_swap.h> 16 17 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 18 # pragma GCC system_header 19 #endif 20 21 _LIBCPP_BEGIN_NAMESPACE_STD 22 23 #if _LIBCPP_STD_VER >= 20 24 25 template <class _Iterator> 26 concept permutable = 27 forward_iterator<_Iterator> && indirectly_movable_storable<_Iterator, _Iterator> && 28 indirectly_swappable<_Iterator, _Iterator>; 29 30 #endif // _LIBCPP_STD_VER >= 20 31 32 _LIBCPP_END_NAMESPACE_STD 33 34 #endif // _LIBCPP___ITERATOR_PERMUTABLE_H 35