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
25template <class _Iterator>
26concept 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