libcxx/include/__iterator/permutable.h

   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> &&
  28     indirectly_movable_storable<_Iterator, _Iterator> &&
  29     indirectly_swappable<_Iterator, _Iterator>;
  30
  31 #endif // _LIBCPP_STD_VER >= 20
  32
  33 _LIBCPP_END_NAMESPACE_STD
  34
  35 #endif // _LIBCPP___ITERATOR_PERMUTABLE_H