libcxx/include/__iterator/sortable.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_SORTABLE_H
  11 #define _LIBCPP___ITERATOR_SORTABLE_H
  12
  13 #include <__config>
  14 #include <__functional/identity.h>
  15 #include <__functional/ranges_operations.h>
  16 #include <__iterator/concepts.h>
  17 #include <__iterator/permutable.h>
  18 #include <__iterator/projected.h>
  19
  20 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  21 #  pragma GCC system_header
  22 #endif
  23
  24 _LIBCPP_BEGIN_NAMESPACE_STD
  25
  26 #if _LIBCPP_STD_VER >= 20
  27
  28 template <class _Iter, class _Comp = ranges::less, class _Proj = identity>
  29 concept sortable = permutable<_Iter> && indirect_strict_weak_order<_Comp, projected<_Iter, _Proj>>;
  30
  31 #endif // _LIBCPP_STD_VER >= 20
  32
  33 _LIBCPP_END_NAMESPACE_STD
  34
  35 #endif // _LIBCPP___ITERATOR_SORTABLE_H