chromium/third_party/libc++/src/include/__algorithm/copy_move_common.h

//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP___ALGORITHM_COPY_MOVE_COMMON_H
#define _LIBCPP___ALGORITHM_COPY_MOVE_COMMON_H

#include <__algorithm/iterator_operations.h>
#include <__algorithm/unwrap_iter.h>
#include <__algorithm/unwrap_range.h>
#include <__config>
#include <__iterator/iterator_traits.h>
#include <__memory/pointer_traits.h>
#include <__string/constexpr_c_functions.h>
#include <__type_traits/enable_if.h>
#include <__type_traits/is_always_bitcastable.h>
#include <__type_traits/is_constant_evaluated.h>
#include <__type_traits/is_constructible.h>
#include <__type_traits/is_trivially_assignable.h>
#include <__type_traits/is_volatile.h>
#include <__utility/move.h>
#include <__utility/pair.h>
#include <cstddef>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#  pragma GCC system_header
#endif

_LIBCPP_PUSH_MACROS
#include <__undef_macros>

_LIBCPP_BEGIN_NAMESPACE_STD

// Type traits.

template <class _From, class _To>
struct __can_lower_copy_assignment_to_memmove { … };

template <class _From, class _To>
struct __can_lower_move_assignment_to_memmove { … };

// `memmove` algorithms implementation.

template <class _In, class _Out>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<_In*, _Out*>
__copy_trivial_impl(_In* __first, _In* __last, _Out* __result) { … }

template <class _In, class _Out>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<_In*, _Out*>
__copy_backward_trivial_impl(_In* __first, _In* __last, _Out* __result) { … }

// Iterator unwrapping and dispatching to the correct overload.

template <class _InIter, class _OutIter>
struct __can_rewrap
    : integral_constant<bool, is_copy_constructible<_InIter>::value && is_copy_constructible<_OutIter>::value> { … };

template <class _Algorithm,
          class _InIter,
          class _Sent,
          class _OutIter,
          __enable_if_t<__can_rewrap<_InIter, _OutIter>::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 pair<_InIter, _OutIter>
__copy_move_unwrap_iters(_InIter __first, _Sent __last, _OutIter __out_first) { … }

template <class _Algorithm,
          class _InIter,
          class _Sent,
          class _OutIter,
          __enable_if_t<!__can_rewrap<_InIter, _OutIter>::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 pair<_InIter, _OutIter>
__copy_move_unwrap_iters(_InIter __first, _Sent __last, _OutIter __out_first) { … }

_LIBCPP_END_NAMESPACE_STD

_LIBCPP_POP_MACROS

#endif // _LIBCPP___ALGORITHM_COPY_MOVE_COMMON_H