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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// SPDX-FileCopyrightText: Copyright (c) 2023 NVIDIA CORPORATION & AFFILIATES
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCUDACXX___ITERATOR_MERGEABLE_H
#define _LIBCUDACXX___ITERATOR_MERGEABLE_H
#ifndef __cuda_std__
#include <__config>
#endif // __cuda_std__
#include "../__functional/identity.h"
#include "../__functional/ranges_operations.h"
#include "../__iterator/concepts.h"
#include "../__iterator/projected.h"
#if defined(_CCCL_IMPLICIT_SYSTEM_HEADER_GCC)
# pragma GCC system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_CLANG)
# pragma clang system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_MSVC)
# pragma system_header
#endif // no system header
_LIBCUDACXX_BEGIN_NAMESPACE_STD
#if _LIBCUDACXX_STD_VER > 17
template <class _Input1, class _Input2, class _Output,
class _Comp = _CUDA_VRANGES::less, class _Proj1 = identity, class _Proj2 = identity>
concept mergeable =
input_iterator<_Input1> &&
input_iterator<_Input2> &&
weakly_incrementable<_Output> &&
indirectly_copyable<_Input1, _Output> &&
indirectly_copyable<_Input2, _Output> &&
indirect_strict_weak_order<_Comp, projected<_Input1, _Proj1>, projected<_Input2, _Proj2>>;
#elif _LIBCUDACXX_STD_VER > 14
template <class _Input1, class _Input2, class _Output,
class _Comp, class _Proj1, class _Proj2>
_LIBCUDACXX_CONCEPT_FRAGMENT(
__mergeable_,
requires()(
requires(input_iterator<_Input1>),
requires(input_iterator<_Input2>),
requires(weakly_incrementable<_Output>),
requires(indirectly_copyable<_Input1, _Output>),
requires(indirectly_copyable<_Input2, _Output>),
requires(indirect_strict_weak_order<_Comp, projected<_Input1, _Proj1>, projected<_Input2, _Proj2>>)
));
template <class _Input1, class _Input2, class _Output,
class _Comp = _CUDA_VRANGES::less, class _Proj1 = identity, class _Proj2 = identity>
_LIBCUDACXX_CONCEPT mergeable =
_LIBCUDACXX_FRAGMENT(__mergeable_, _Input1, _Input2, _Output, _Comp, _Proj1, _Proj2);
#endif // _LIBCUDACXX_STD_VER > 14
_LIBCUDACXX_END_NAMESPACE_STD
#endif // _LIBCUDACXX___ITERATOR_MERGEABLE_H
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