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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_ITER_MOVE_H
#define _LIBCUDACXX___ITERATOR_ITER_MOVE_H
#ifndef __cuda_std__
#include <__config>
#endif // __cuda_std__
#include "../__concepts/class_or_enum.h"
#include "../__iterator/iterator_traits.h"
#include "../__type_traits/enable_if.h"
#include "../__type_traits/is_reference.h"
#include "../__type_traits/remove_cvref.h"
#include "../__utility/declval.h"
#include "../__utility/forward.h"
#include "../__utility/move.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
#if defined(__clang__)
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wvoid-ptr-dereference"
#endif
#if _LIBCUDACXX_STD_VER > 14
// [iterator.cust.move]
_LIBCUDACXX_BEGIN_NAMESPACE_RANGES
_LIBCUDACXX_BEGIN_NAMESPACE_CPO(__iter_move)
_LIBCUDACXX_INLINE_VISIBILITY
void iter_move();
#if LIBCUDACXX_STD_VER > 17
template <class _Tp>
concept __unqualified_iter_move =
__class_or_enum<remove_cvref_t<_Tp>> &&
requires (_Tp&& __t) {
iter_move(_CUDA_VSTD::forward<_Tp>(__t));
};
template<class _Tp>
concept __move_deref =
!__unqualified_iter_move<_Tp> &&
requires (_Tp&& __t) {
*__t;
requires is_lvalue_reference_v<decltype(*__t)>;
};
template<class _Tp>
concept __just_deref =
!__unqualified_iter_move<_Tp> &&
!__move_deref<_Tp> &&
requires (_Tp&& __t) {
*__t;
requires (!is_lvalue_reference_v<decltype(*__t)>);
};
#else // ^^^ CXX20 ^^^ / vvv CXX17 vvv
template <class _Tp>
_LIBCUDACXX_CONCEPT_FRAGMENT(
__unqualified_iter_move_,
requires(_Tp&& __t)(
requires(__class_or_enum<remove_cvref_t<_Tp>>),
(iter_move(_CUDA_VSTD::forward<_Tp>(__t)))
));
template <class _Tp>
_LIBCUDACXX_CONCEPT __unqualified_iter_move = _LIBCUDACXX_FRAGMENT(__unqualified_iter_move_, _Tp);
template <class _Tp>
_LIBCUDACXX_CONCEPT_FRAGMENT(
__move_deref_,
requires(_Tp&& __t)(
requires(!__unqualified_iter_move<_Tp>),
requires(is_lvalue_reference_v<decltype(*__t)>)
));
template<class _Tp>
_LIBCUDACXX_CONCEPT __move_deref = _LIBCUDACXX_FRAGMENT(__move_deref_, _Tp);
template<class _Tp>
_LIBCUDACXX_CONCEPT_FRAGMENT(
__just_deref_,
requires(_Tp&& __t)(
requires(!__unqualified_iter_move<_Tp>),
requires(!__move_deref<_Tp>),
requires(!is_lvalue_reference_v<decltype(*__t)>)
));
template<class _Tp>
_LIBCUDACXX_CONCEPT __just_deref = _LIBCUDACXX_FRAGMENT(__just_deref_, _Tp);
#endif // LIBCUDACXX_STD_VER < 20
// [iterator.cust.move]
struct __fn {
_LIBCUDACXX_TEMPLATE(class _Ip)
_LIBCUDACXX_REQUIRES( __unqualified_iter_move<_Ip>)
_LIBCUDACXX_NODISCARD_ATTRIBUTE _LIBCUDACXX_INLINE_VISIBILITY
constexpr decltype(auto) operator()(_Ip&& __i) const
noexcept(noexcept(iter_move(_CUDA_VSTD::forward<_Ip>(__i))))
{
return iter_move(_CUDA_VSTD::forward<_Ip>(__i));
}
_LIBCUDACXX_TEMPLATE(class _Ip)
_LIBCUDACXX_REQUIRES( __move_deref<_Ip>)
_LIBCUDACXX_NODISCARD_ATTRIBUTE _LIBCUDACXX_INLINE_VISIBILITY constexpr auto operator()(_Ip&& __i) const
noexcept(noexcept(_CUDA_VSTD::move(*_CUDA_VSTD::forward<_Ip>(__i))))
-> decltype( _CUDA_VSTD::move(*_CUDA_VSTD::forward<_Ip>(__i)))
{ return _CUDA_VSTD::move(*_CUDA_VSTD::forward<_Ip>(__i)); }
_LIBCUDACXX_TEMPLATE(class _Ip)
_LIBCUDACXX_REQUIRES( __just_deref<_Ip>)
_LIBCUDACXX_NODISCARD_ATTRIBUTE _LIBCUDACXX_INLINE_VISIBILITY constexpr auto operator()(_Ip&& __i) const
noexcept(noexcept(*_CUDA_VSTD::forward<_Ip>(__i)))
-> decltype( *_CUDA_VSTD::forward<_Ip>(__i))
{ return *_CUDA_VSTD::forward<_Ip>(__i); }
};
_LIBCUDACXX_END_NAMESPACE_CPO
inline namespace __cpo {
_LIBCUDACXX_CPO_ACCESSIBILITY auto iter_move = __iter_move::__fn{};
} // namespace __cpo
_LIBCUDACXX_END_NAMESPACE_RANGES
_LIBCUDACXX_BEGIN_NAMESPACE_STD
#if _LIBCUDACXX_STD_VER > 17
template<__dereferenceable _Tp>
requires requires(_Tp& __t) { { _CUDA_VRANGES::iter_move(__t) } -> __can_reference; }
using iter_rvalue_reference_t = decltype(_CUDA_VRANGES::iter_move(_CUDA_VSTD::declval<_Tp&>()));
#else
template<class _Tp>
_LIBCUDACXX_CONCEPT_FRAGMENT(
__can_iter_rvalue_reference_t_,
requires(_Tp& __t)(
requires(__dereferenceable<_Tp>),
requires(__can_reference<decltype(_CUDA_VRANGES::iter_move(__t))>)
));
template<class _Tp>
_LIBCUDACXX_CONCEPT __can_iter_rvalue_reference_t = _LIBCUDACXX_FRAGMENT(__can_iter_rvalue_reference_t_, _Tp);
template<class _Tp>
using __iter_rvalue_reference_t = decltype(_CUDA_VRANGES::iter_move(_CUDA_VSTD::declval<_Tp&>()));
template<class _Tp>
using iter_rvalue_reference_t = enable_if_t<__can_iter_rvalue_reference_t<_Tp>,
__iter_rvalue_reference_t<_Tp>>;
#endif // LIBCUDACXX_STD_VER < 20
_LIBCUDACXX_END_NAMESPACE_STD
#endif // _LIBCUDACXX_STD_VER > 14
#if defined(__clang__)
#pragma clang diagnostic pop
#endif
#endif // _LIBCUDACXX___ITERATOR_ITER_MOVE_H
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