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_MERGEABLE_H 11#define _LIBCPP___ITERATOR_MERGEABLE_H 12 13#include <__config> 14#include <__functional/identity.h> 15#include <__functional/ranges_operations.h> 16#include <__iterator/concepts.h> 17#include <__iterator/projected.h> 18 19#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 20# pragma GCC system_header 21#endif 22 23_LIBCPP_BEGIN_NAMESPACE_STD 24 25#if _LIBCPP_STD_VER > 17 26 27template <class _Input1, class _Input2, class _Output, 28 class _Comp = ranges::less, class _Proj1 = identity, class _Proj2 = identity> 29concept mergeable = 30 input_iterator<_Input1> && 31 input_iterator<_Input2> && 32 weakly_incrementable<_Output> && 33 indirectly_copyable<_Input1, _Output> && 34 indirectly_copyable<_Input2, _Output> && 35 indirect_strict_weak_order<_Comp, projected<_Input1, _Proj1>, projected<_Input2, _Proj2>>; 36 37#endif // _LIBCPP_STD_VER > 17 38 39_LIBCPP_END_NAMESPACE_STD 40 41#endif // _LIBCPP___ITERATOR_MERGEABLE_H 42