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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
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCPP___ALGORITHM_UNIQUE_COPY_H
#define _LIBCPP___ALGORITHM_UNIQUE_COPY_H
#include <__algorithm/comp.h>
#include <__algorithm/iterator_operations.h>
#include <__config>
#include <__iterator/iterator_traits.h>
#include <__type_traits/conditional.h>
#include <__type_traits/is_base_of.h>
#include <__type_traits/is_same.h>
#include <__utility/move.h>
#include <__utility/pair.h>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
_LIBCPP_BEGIN_NAMESPACE_STD
namespace __unique_copy_tags {
struct __reread_from_input_tag {};
struct __reread_from_output_tag {};
struct __read_from_tmp_value_tag {};
} // namespace __unique_copy_tags
template <class _AlgPolicy, class _BinaryPredicate, class _InputIterator, class _Sent, class _OutputIterator>
_LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI pair<_InputIterator, _OutputIterator>
__unique_copy(_InputIterator __first,
_Sent __last,
_OutputIterator __result,
_BinaryPredicate&& __pred,
__unique_copy_tags::__read_from_tmp_value_tag) {
if (__first != __last) {
typename _IterOps<_AlgPolicy>::template __value_type<_InputIterator> __t(*__first);
*__result = __t;
++__result;
while (++__first != __last) {
if (!__pred(__t, *__first)) {
__t = *__first;
*__result = __t;
++__result;
}
}
}
return pair<_InputIterator, _OutputIterator>(std::move(__first), std::move(__result));
}
template <class _AlgPolicy, class _BinaryPredicate, class _ForwardIterator, class _Sent, class _OutputIterator>
_LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI pair<_ForwardIterator, _OutputIterator>
__unique_copy(_ForwardIterator __first,
_Sent __last,
_OutputIterator __result,
_BinaryPredicate&& __pred,
__unique_copy_tags::__reread_from_input_tag) {
if (__first != __last) {
_ForwardIterator __i = __first;
*__result = *__i;
++__result;
while (++__first != __last) {
if (!__pred(*__i, *__first)) {
*__result = *__first;
++__result;
__i = __first;
}
}
}
return pair<_ForwardIterator, _OutputIterator>(std::move(__first), std::move(__result));
}
template <class _AlgPolicy, class _BinaryPredicate, class _InputIterator, class _Sent, class _InputAndOutputIterator>
_LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI pair<_InputIterator, _InputAndOutputIterator>
__unique_copy(_InputIterator __first,
_Sent __last,
_InputAndOutputIterator __result,
_BinaryPredicate&& __pred,
__unique_copy_tags::__reread_from_output_tag) {
if (__first != __last) {
*__result = *__first;
while (++__first != __last)
if (!__pred(*__result, *__first))
*++__result = *__first;
++__result;
}
return pair<_InputIterator, _InputAndOutputIterator>(std::move(__first), std::move(__result));
}
template <class _InputIterator, class _OutputIterator, class _BinaryPredicate>
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator
unique_copy(_InputIterator __first, _InputIterator __last, _OutputIterator __result, _BinaryPredicate __pred) {
using __algo_tag = __conditional_t<
is_base_of<forward_iterator_tag, typename iterator_traits<_InputIterator>::iterator_category>::value,
__unique_copy_tags::__reread_from_input_tag,
__conditional_t<
is_base_of<forward_iterator_tag, typename iterator_traits<_OutputIterator>::iterator_category>::value &&
is_same< typename iterator_traits<_InputIterator>::value_type,
typename iterator_traits<_OutputIterator>::value_type>::value,
__unique_copy_tags::__reread_from_output_tag,
__unique_copy_tags::__read_from_tmp_value_tag> >;
return std::__unique_copy<_ClassicAlgPolicy>(
std::move(__first), std::move(__last), std::move(__result), __pred, __algo_tag())
.second;
}
template <class _InputIterator, class _OutputIterator>
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator
unique_copy(_InputIterator __first, _InputIterator __last, _OutputIterator __result) {
return std::unique_copy(std::move(__first), std::move(__last), std::move(__result), __equal_to());
}
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP___ALGORITHM_UNIQUE_COPY_H
|
