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// Algorithm implementation -*- C++ -*-
// Copyright (C) 2001-2026 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.
// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
// <http://www.gnu.org/licenses/>.
/*
*
* Copyright (c) 1994
* Hewlett-Packard Company
*
* Permission to use, copy, modify, distribute and sell this software
* and its documentation for any purpose is hereby granted without fee,
* provided that the above copyright notice appear in all copies and
* that both that copyright notice and this permission notice appear
* in supporting documentation. Hewlett-Packard Company makes no
* representations about the suitability of this software for any
* purpose. It is provided "as is" without express or implied warranty.
*
*
* Copyright (c) 1996
* Silicon Graphics Computer Systems, Inc.
*
* Permission to use, copy, modify, distribute and sell this software
* and its documentation for any purpose is hereby granted without fee,
* provided that the above copyright notice appear in all copies and
* that both that copyright notice and this permission notice appear
* in supporting documentation. Silicon Graphics makes no
* representations about the suitability of this software for any
* purpose. It is provided "as is" without express or implied warranty.
*/
/** @file bits/stl_algo.h
* This is an internal header file, included by other library headers.
* Do not attempt to use it directly. @headername{algorithm}
*/
#ifndef _STL_ALGO_H
#define _STL_ALGO_H 1
#include <bits/algorithmfwd.h>
#include <bits/stl_algobase.h>
#include <bits/stl_heap.h>
#include <bits/predefined_ops.h>
#if __cplusplus >= 201103L
#include <bits/uniform_int_dist.h>
#endif
#if _GLIBCXX_HOSTED
# include <bits/stl_tempbuf.h> // for _Temporary_buffer
# if (__cplusplus <= 201103L || _GLIBCXX_USE_DEPRECATED)
# include <cstdlib> // for rand
# endif
#endif
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wc++11-extensions" // inline namespace
// See concept_check.h for the __glibcxx_*_requires macros.
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
/// @cond undocumented
/// Swaps the median value of *__a, *__b and *__c under __comp to *__result
template<typename _Iterator, typename _Compare>
_GLIBCXX20_CONSTEXPR
void
__move_median_to_first(_Iterator __result, _Iterator __a, _Iterator __b,
_Iterator __c, _Compare __comp)
{
if (__comp(*__a, *__b))
{
if (__comp(*__b, *__c))
std::iter_swap(__result, __b);
else if (__comp(*__a, *__c))
std::iter_swap(__result, __c);
else
std::iter_swap(__result, __a);
}
else if (__comp(*__a, *__c))
std::iter_swap(__result, __a);
else if (__comp(*__b, *__c))
std::iter_swap(__result, __c);
else
std::iter_swap(__result, __b);
}
/// Provided for stable_partition to use.
template<typename _InputIterator, typename _Predicate>
_GLIBCXX20_CONSTEXPR
inline _InputIterator
__find_if_not(_InputIterator __first, _InputIterator __last,
_Predicate __pred)
{
return std::__find_if(__first, __last,
__gnu_cxx::__ops::not1(__pred));
}
/// Like find_if_not(), but uses and updates a count of the
/// remaining range length instead of comparing against an end
/// iterator.
template<typename _InputIterator, typename _Predicate, typename _Distance>
_GLIBCXX20_CONSTEXPR
_InputIterator
__find_if_not_n(_InputIterator __first, _Distance& __len, _Predicate __pred)
{
for (; __len; --__len, (void) ++__first)
if (!__pred(*__first))
break;
return __first;
}
// Apply __f to each element in [__first, __last)
// Dispatches to __for_each_segment for segmented iterators
// (e.g. deque::iterator).
// Returns an iterator equal to __last.
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wc++17-extensions" // if constexpr
#pragma GCC diagnostic ignored "-Wc++20-extensions" // template lambda
template<typename _InputIterator, typename _Function>
_GLIBCXX20_CONSTEXPR
_InputIterator
__for_each(_InputIterator __first, _InputIterator __last, _Function& __f)
{
#if __cplusplus >= 201103L
if constexpr (__enable_for_each_segment<_InputIterator>)
{
std::__for_each_segment(__first, __last,
[&]<typename _Iter>(_Iter __lfirst, _Iter __llast)
{ return std::__for_each(__lfirst, __llast, __f); });
return __last;
}
else
#endif // C++11
{
for (; __first != __last; ++__first)
__f(*__first);
return __first;
}
}
#pragma GCC diagnostic pop
// set_difference
// set_intersection
// set_symmetric_difference
// set_union
// for_each
// find
// find_if
// find_first_of
// adjacent_find
// count
// count_if
// search
// search_n
/**
* This is an helper function for search_n overloaded for forward iterators.
*/
template<typename _ForwardIterator, typename _Integer,
typename _UnaryPredicate>
_GLIBCXX20_CONSTEXPR
_ForwardIterator
__search_n_aux(_ForwardIterator __first, _ForwardIterator __last,
_Integer __count, _UnaryPredicate __unary_pred,
std::forward_iterator_tag)
{
__first = std::__find_if(__first, __last, __unary_pred);
while (__first != __last)
{
typename iterator_traits<_ForwardIterator>::difference_type
__n = __count;
_ForwardIterator __i = __first;
++__i;
while (__i != __last && __n != 1 && __unary_pred(*__i))
{
++__i;
--__n;
}
if (__n == 1)
return __first;
if (__i == __last)
return __last;
__first = std::__find_if(++__i, __last, __unary_pred);
}
return __last;
}
/**
* This is an helper function for search_n overloaded for random access
* iterators.
*/
template<typename _RandomAccessIter, typename _Integer,
typename _UnaryPredicate>
_GLIBCXX20_CONSTEXPR
_RandomAccessIter
__search_n_aux(_RandomAccessIter __first, _RandomAccessIter __last,
_Integer __count, _UnaryPredicate __unary_pred,
std::random_access_iterator_tag)
{
typedef typename std::iterator_traits<_RandomAccessIter>::difference_type
_DistanceType;
_DistanceType __tailSize = __last - __first;
_DistanceType __remainder = __count;
while (__remainder <= __tailSize) // the main loop...
{
__first += __remainder;
__tailSize -= __remainder;
// __first here is always pointing to one past the last element of
// next possible match.
_RandomAccessIter __backTrack = __first;
while (__unary_pred(*--__backTrack))
{
if (--__remainder == 0)
return __first - _DistanceType(__count); // Success
}
__remainder = __count + 1 - (__first - __backTrack);
}
return __last; // Failure
}
template<typename _ForwardIterator, typename _Integer,
typename _UnaryPredicate>
_GLIBCXX20_CONSTEXPR
_ForwardIterator
__search_n(_ForwardIterator __first, _ForwardIterator __last,
_Integer __count,
_UnaryPredicate __unary_pred)
{
if (__count <= 0)
return __first;
if (__count == 1)
return std::__find_if(__first, __last, __unary_pred);
return std::__search_n_aux(__first, __last, __count, __unary_pred,
std::__iter_concept_or_category(__first));
}
// find_end for forward iterators.
template<typename _ForwardIterator1, typename _ForwardIterator2,
typename _BinaryPredicate>
_GLIBCXX20_CONSTEXPR
_ForwardIterator1
__find_end(_ForwardIterator1 __first1, _ForwardIterator1 __last1,
_ForwardIterator2 __first2, _ForwardIterator2 __last2,
forward_iterator_tag, forward_iterator_tag,
_BinaryPredicate __comp)
{
if (__first2 == __last2)
return __last1;
_ForwardIterator1 __result = __last1;
while (1)
{
_ForwardIterator1 __new_result
= std::__search(__first1, __last1, __first2, __last2, __comp);
if (__new_result == __last1)
return __result;
else
{
__result = __new_result;
__first1 = __new_result;
++__first1;
}
}
}
// find_end for bidirectional iterators (much faster).
template<typename _BidirectionalIterator1, typename _BidirectionalIterator2,
typename _BinaryPredicate>
_GLIBCXX20_CONSTEXPR
_BidirectionalIterator1
__find_end(_BidirectionalIterator1 __first1,
_BidirectionalIterator1 __last1,
_BidirectionalIterator2 __first2,
_BidirectionalIterator2 __last2,
bidirectional_iterator_tag, bidirectional_iterator_tag,
_BinaryPredicate __comp)
{
// concept requirements
__glibcxx_function_requires(_BidirectionalIteratorConcept<
_BidirectionalIterator1>)
__glibcxx_function_requires(_BidirectionalIteratorConcept<
_BidirectionalIterator2>)
typedef reverse_iterator<_BidirectionalIterator1> _RevIterator1;
typedef reverse_iterator<_BidirectionalIterator2> _RevIterator2;
_RevIterator1 __rlast1(__first1);
_RevIterator2 __rlast2(__first2);
_RevIterator1 __rresult = std::__search(_RevIterator1(__last1), __rlast1,
_RevIterator2(__last2), __rlast2,
__comp);
if (__rresult == __rlast1)
return __last1;
else
{
_BidirectionalIterator1 __result = __rresult.base();
std::advance(__result, -std::distance(__first2, __last2));
return __result;
}
}
/// @endcond
/**
* @brief Find last matching subsequence in a sequence.
* @ingroup non_mutating_algorithms
* @param __first1 Start of range to search.
* @param __last1 End of range to search.
* @param __first2 Start of sequence to match.
* @param __last2 End of sequence to match.
* @return The last iterator `i` in the range
* `[__first1, __last1 - (__last2 - __first2))` such that
* `*(i + N) == *(__first2 + N)` for each `N` in the range
* `[0, __last2 - __first2)`, or `__last1` if no such iterator
* exists.
*
* Searches the range `[__first1, __last1)` for a sub-sequence that
* compares equal value-by-value with the sequence given by
* `[__first2, __last2)` and returns an iterator to the first
* element of the sub-sequence, or `__last1` if the sub-sequence
* is not found. The sub-sequence will be the last such
* subsequence contained in `[__first1, __last1)`.
*
* Because the sub-sequence must lie completely within the range
* `[__first1, __last1)` it must start at a position less than
* `__last1 - (__last2 - __first2)` where `__last2 - __first2` is the
* length of the sub-sequence. This means that the returned
* iterator `i` will be in the range
* `[__first1, __last1 - (__last2 - __first2))`
*/
template<typename _ForwardIterator1, typename _ForwardIterator2>
_GLIBCXX_NODISCARD _GLIBCXX20_CONSTEXPR
inline _ForwardIterator1
find_end(_ForwardIterator1 __first1, _ForwardIterator1 __last1,
_ForwardIterator2 __first2, _ForwardIterator2 __last2)
{
// concept requirements
__glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator1>)
__glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator2>)
__glibcxx_function_requires(_EqualOpConcept<
typename iterator_traits<_ForwardIterator1>::value_type,
typename iterator_traits<_ForwardIterator2>::value_type>)
__glibcxx_requires_valid_range(__first1, __last1);
__glibcxx_requires_valid_range(__first2, __last2);
return std::__find_end(__first1, __last1, __first2, __last2,
std::__iter_concept_or_category(__first1),
std::__iter_concept_or_category(__first2),
__gnu_cxx::__ops::equal_to());
}
/**
* @brief Find last matching subsequence in a sequence using a predicate.
* @ingroup non_mutating_algorithms
* @param __first1 Start of range to search.
* @param __last1 End of range to search.
* @param __first2 Start of sequence to match.
* @param __last2 End of sequence to match.
* @param __comp The predicate to use.
* @return The last iterator `i` in the range
* `[__first1, __last1-(__last2 - __first2))` such that
* `__comp(*(i + N), (__first2 + N))` is true for each `N` in the
* range `[0, __last2 - __first2)`, or `__last1` if no such iterator
* exists.
*
* Searches the range `[__first1, __last1)` for a sub-sequence that
* compares equal value-by-value with the sequence given by
* `[__first2, __last2)` using `__comp` as a predicate and returns an
* iterator to the first element of the sub-sequence, or `__last1`
* if the sub-sequence is not found. The sub-sequence will be the
* last such subsequence contained in `[__first, __last1)`.
*
* Because the sub-sequence must lie completely within the range
* `[__first1, __last1)` it must start at a position less than
* `__last1 - (__last2 - __first2)` where `__last2 - __first2` is the
* length of the sub-sequence. This means that the returned
* iterator `i` will be in the range
* `[__first1, __last1 - (__last2 - __first2))`
*/
template<typename _ForwardIterator1, typename _ForwardIterator2,
typename _BinaryPredicate>
_GLIBCXX_NODISCARD _GLIBCXX20_CONSTEXPR
inline _ForwardIterator1
find_end(_ForwardIterator1 __first1, _ForwardIterator1 __last1,
_ForwardIterator2 __first2, _ForwardIterator2 __last2,
_BinaryPredicate __comp)
{
// concept requirements
__glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator1>)
__glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator2>)
__glibcxx_function_requires(_BinaryPredicateConcept<_BinaryPredicate,
typename iterator_traits<_ForwardIterator1>::value_type,
typename iterator_traits<_ForwardIterator2>::value_type>)
__glibcxx_requires_valid_range(__first1, __last1);
__glibcxx_requires_valid_range(__first2, __last2);
return std::__find_end(__first1, __last1, __first2, __last2,
std::__iter_concept_or_category(__first1),
std::__iter_concept_or_category(__first2),
__comp);
}
#if __cplusplus >= 201103L
/**
* @brief Checks that a predicate is true for all the elements
* of a sequence.
* @ingroup non_mutating_algorithms
* @param __first An input iterator.
* @param __last An input iterator.
* @param __pred A predicate.
* @return True if the check is true, false otherwise.
*
* Returns true if `__pred` is true for each element in the range
* `[__first, __last)`, and false otherwise.
*/
template<typename _InputIterator, typename _Predicate>
_GLIBCXX_NODISCARD _GLIBCXX20_CONSTEXPR
inline bool
all_of(_InputIterator __first, _InputIterator __last, _Predicate __pred)
{ return __last == std::find_if_not(__first, __last, __pred); }
/**
* @brief Checks that a predicate is false for all the elements
* of a sequence.
* @ingroup non_mutating_algorithms
* @param __first An input iterator.
* @param __last An input iterator.
* @param __pred A predicate.
* @return True if the check is true, false otherwise.
*
* Returns true if `__pred` is false for each element in the range
* `[__first, __last)`, and false otherwise.
*/
template<typename _InputIterator, typename _Predicate>
_GLIBCXX_NODISCARD _GLIBCXX20_CONSTEXPR
inline bool
none_of(_InputIterator __first, _InputIterator __last, _Predicate __pred)
{ return __last == _GLIBCXX_STD_A::find_if(__first, __last, __pred); }
/**
* @brief Checks that a predicate is true for at least one element
* of a sequence.
* @ingroup non_mutating_algorithms
* @param __first An input iterator.
* @param __last An input iterator.
* @param __pred A predicate.
* @return True if the check is true, false otherwise.
*
* Returns true if an element exists in the range
* `[__first, __last)` such that `__pred` is true, and false
* otherwise.
*/
template<typename _InputIterator, typename _Predicate>
_GLIBCXX_NODISCARD _GLIBCXX20_CONSTEXPR
inline bool
any_of(_InputIterator __first, _InputIterator __last, _Predicate __pred)
{ return !std::none_of(__first, __last, __pred); }
/**
* @brief Find the first element in a sequence for which a
* predicate is false.
* @ingroup non_mutating_algorithms
* @param __first An input iterator.
* @param __last An input iterator.
* @param __pred A predicate.
* @return The first iterator `i` in the range `[__first, __last)`
* such that `__pred(*i)` is false, or `__last` if no such iterator exists.
*/
template<typename _InputIterator, typename _Predicate>
_GLIBCXX_NODISCARD _GLIBCXX20_CONSTEXPR
inline _InputIterator
find_if_not(_InputIterator __first, _InputIterator __last,
_Predicate __pred)
{
// concept requirements
__glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
__glibcxx_function_requires(_UnaryPredicateConcept<_Predicate,
typename iterator_traits<_InputIterator>::value_type>)
__glibcxx_requires_valid_range(__first, __last);
return std::__find_if_not(__first, __last, __pred);
}
/**
* @brief Checks whether the sequence is partitioned.
* @ingroup mutating_algorithms
* @param __first An input iterator.
* @param __last An input iterator.
* @param __pred A predicate.
* @return True if the range `[__first, __last)` is partitioned by
* `__pred`, i.e. if all elements that satisfy `__pred` appear before
* those that do not.
*/
template<typename _InputIterator, typename _Predicate>
_GLIBCXX_NODISCARD _GLIBCXX20_CONSTEXPR
inline bool
is_partitioned(_InputIterator __first, _InputIterator __last,
_Predicate __pred)
{
__first = std::find_if_not(__first, __last, __pred);
if (__first == __last)
return true;
++__first;
return std::none_of(__first, __last, __pred);
}
/**
* @brief Find the partition point of a partitioned range.
* @ingroup mutating_algorithms
* @param __first An iterator.
* @param __last Another iterator.
* @param __pred A predicate.
* @return An iterator `mid` such that `all_of(__first, mid, __pred)`
* and `none_of(mid, __last, __pred)` are both true.
*/
template<typename _ForwardIterator, typename _Predicate>
_GLIBCXX_NODISCARD _GLIBCXX20_CONSTEXPR
_ForwardIterator
partition_point(_ForwardIterator __first, _ForwardIterator __last,
_Predicate __pred)
{
// concept requirements
__glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
__glibcxx_function_requires(_UnaryPredicateConcept<_Predicate,
typename iterator_traits<_ForwardIterator>::value_type>)
// A specific debug-mode test will be necessary...
__glibcxx_requires_valid_range(__first, __last);
typedef typename iterator_traits<_ForwardIterator>::difference_type
_DistanceType;
_DistanceType __len = std::distance(__first, __last);
while (__len > 0)
{
_DistanceType __half = __len >> 1;
_ForwardIterator __middle = __first;
std::advance(__middle, __half);
if (__pred(*__middle))
{
__first = __middle;
++__first;
__len = __len - __half - 1;
}
else
__len = __half;
}
return __first;
}
#endif
template<typename _InputIterator, typename _OutputIterator,
typename _Predicate>
_GLIBCXX20_CONSTEXPR
_OutputIterator
__remove_copy_if(_InputIterator __first, _InputIterator __last,
_OutputIterator __result, _Predicate __pred)
{
for (; __first != __last; ++__first)
if (!__pred(*__first))
{
*__result = *__first;
++__result;
}
return __result;
}
/**
* @brief Copy a sequence, removing elements of a given value.
* @ingroup mutating_algorithms
* @param __first An input iterator.
* @param __last An input iterator.
* @param __result An output iterator.
* @param __value The value to be removed.
* @return An iterator designating the end of the resulting sequence.
*
* Copies each element in the range `[__first, __last)` not equal
* to `__value` to the range beginning at `__result`.
* `remove_copy` is stable, so the relative order of elements that
* are copied is unchanged.
*/
template<typename _InputIterator, typename _OutputIterator, typename _Tp>
_GLIBCXX20_CONSTEXPR
inline _OutputIterator
remove_copy(_InputIterator __first, _InputIterator __last,
_OutputIterator __result, const _Tp& __value)
{
// concept requirements
__glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
__glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
typename iterator_traits<_InputIterator>::value_type>)
__glibcxx_function_requires(_EqualOpConcept<
typename iterator_traits<_InputIterator>::value_type, _Tp>)
__glibcxx_requires_valid_range(__first, __last);
return std::__remove_copy_if(__first, __last, __result,
__gnu_cxx::__ops::__equal_to(__value));
}
/**
* @brief Copy a sequence, removing elements for which a predicate is true.
* @ingroup mutating_algorithms
* @param __first An input iterator.
* @param __last An input iterator.
* @param __result An output iterator.
* @param __pred A predicate.
* @return An iterator designating the end of the resulting sequence.
*
* Copies each element in the range `[__first, __last)` for which
* `__pred` returns false to the range beginning at `__result`.
*
* `remove_copy_if` is stable, so the relative order of elements that are
* copied is unchanged.
*/
template<typename _InputIterator, typename _OutputIterator,
typename _Predicate>
_GLIBCXX20_CONSTEXPR
inline _OutputIterator
remove_copy_if(_InputIterator __first, _InputIterator __last,
_OutputIterator __result, _Predicate __pred)
{
// concept requirements
__glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
__glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
typename iterator_traits<_InputIterator>::value_type>)
__glibcxx_function_requires(_UnaryPredicateConcept<_Predicate,
typename iterator_traits<_InputIterator>::value_type>)
__glibcxx_requires_valid_range(__first, __last);
return std::__remove_copy_if(__first, __last, __result, __pred);
}
#if __cplusplus >= 201103L
/**
* @brief Copy the elements of a sequence for which a predicate is true.
* @ingroup mutating_algorithms
* @param __first An input iterator.
* @param __last An input iterator.
* @param __result An output iterator.
* @param __pred A predicate.
* @return An iterator designating the end of the resulting sequence.
*
* Copies each element in the range `[__first, __last)` for which
* `__pred` returns true to the range beginning at `__result`.
*
* `copy_if` is stable, so the relative order of elements that are
* copied is unchanged.
*/
template<typename _InputIterator, typename _OutputIterator,
typename _Predicate>
_GLIBCXX20_CONSTEXPR
_OutputIterator
copy_if(_InputIterator __first, _InputIterator __last,
_OutputIterator __result, _Predicate __pred)
{
// concept requirements
__glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
__glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
typename iterator_traits<_InputIterator>::value_type>)
__glibcxx_function_requires(_UnaryPredicateConcept<_Predicate,
typename iterator_traits<_InputIterator>::value_type>)
__glibcxx_requires_valid_range(__first, __last);
for (; __first != __last; ++__first)
if (__pred(*__first))
{
*__result = *__first;
++__result;
}
return __result;
}
/**
* @brief Copies the range [first,first+n) into [result,result+n).
* @ingroup mutating_algorithms
* @param __first An input iterator.
* @param __n The number of elements to copy.
* @param __result An output iterator.
* @return result+n.
*
* This inline function will boil down to a call to `memmove` whenever
* possible. Failing that, if random access iterators are passed, then the
* loop count will be known (and therefore a candidate for compiler
* optimizations such as unrolling).
*/
template<typename _InputIterator, typename _Size, typename _OutputIterator>
_GLIBCXX20_CONSTEXPR
inline _OutputIterator
copy_n(_InputIterator __first, _Size __n, _OutputIterator __result)
{
// concept requirements
__glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
__glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
typename iterator_traits<_InputIterator>::value_type>)
const auto __n2 = std::__size_to_integer(__n);
if (__n2 <= 0)
return __result;
__glibcxx_requires_can_increment(__first, __n2);
__glibcxx_requires_can_increment(__result, __n2);
auto __res = std::__copy_n_a(std::__niter_base(__first), __n2,
std::__niter_base(__result), true);
return std::__niter_wrap(__result, std::move(__res));
}
/**
* @brief Copy the elements of a sequence to separate output sequences
* depending on the truth value of a predicate.
* @ingroup mutating_algorithms
* @param __first An input iterator.
* @param __last An input iterator.
* @param __out_true An output iterator.
* @param __out_false An output iterator.
* @param __pred A predicate.
* @return A pair designating the ends of the resulting sequences.
*
* Copies each element in the range `[__first, __last)` for which
* `__pred` returns true to the range beginning at `__out_true`
* and each element for which `__pred` returns false to `__out_false`.
*/
template<typename _InputIterator, typename _OutputIterator1,
typename _OutputIterator2, typename _Predicate>
_GLIBCXX20_CONSTEXPR
pair<_OutputIterator1, _OutputIterator2>
partition_copy(_InputIterator __first, _InputIterator __last,
_OutputIterator1 __out_true, _OutputIterator2 __out_false,
_Predicate __pred)
{
// concept requirements
__glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
__glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator1,
typename iterator_traits<_InputIterator>::value_type>)
__glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator2,
typename iterator_traits<_InputIterator>::value_type>)
__glibcxx_function_requires(_UnaryPredicateConcept<_Predicate,
typename iterator_traits<_InputIterator>::value_type>)
__glibcxx_requires_valid_range(__first, __last);
for (; __first != __last; ++__first)
if (__pred(*__first))
{
*__out_true = *__first;
++__out_true;
}
else
{
*__out_false = *__first;
++__out_false;
}
return pair<_OutputIterator1, _OutputIterator2>(__out_true, __out_false);
}
#endif // C++11
/**
* @brief Remove elements from a sequence.
* @ingroup mutating_algorithms
* @param __first An input iterator.
* @param __last An input iterator.
* @param __value The value to be removed.
* @return An iterator designating the end of the resulting sequence.
*
* All elements equal to `__value` are removed from the range
* `[__first, __last)`.
*
* `remove` is stable, so the relative order of elements that are
* not removed is unchanged.
*
* Elements between the end of the resulting sequence and `__last`
* are still present, but their value is unspecified.
*/
template<typename _ForwardIterator, typename _Tp>
_GLIBCXX_NODISCARD _GLIBCXX20_CONSTEXPR
inline _ForwardIterator
remove(_ForwardIterator __first, _ForwardIterator __last,
const _Tp& __value)
{
// concept requirements
__glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
_ForwardIterator>)
__glibcxx_function_requires(_EqualOpConcept<
typename iterator_traits<_ForwardIterator>::value_type, _Tp>)
__glibcxx_requires_valid_range(__first, __last);
return std::__remove_if(__first, __last,
__gnu_cxx::__ops::__equal_to(__value));
}
/**
* @brief Remove elements from a sequence using a predicate.
* @ingroup mutating_algorithms
* @param __first A forward iterator.
* @param __last A forward iterator.
* @param __pred A predicate.
* @return An iterator designating the end of the resulting sequence.
*
* All elements for which `__pred` returns true are removed from the range
* `[__first, __last)`.
*
* `remove_if` is stable, so the relative order of elements that are
* not removed is unchanged.
*
* Elements between the end of the resulting sequence and `__last`
* are still present, but their value is unspecified.
*/
template<typename _ForwardIterator, typename _Predicate>
_GLIBCXX_NODISCARD _GLIBCXX20_CONSTEXPR
inline _ForwardIterator
remove_if(_ForwardIterator __first, _ForwardIterator __last,
_Predicate __pred)
{
// concept requirements
__glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
_ForwardIterator>)
__glibcxx_function_requires(_UnaryPredicateConcept<_Predicate,
typename iterator_traits<_ForwardIterator>::value_type>)
__glibcxx_requires_valid_range(__first, __last);
return std::__remove_if(__first, __last, __pred);
}
template<typename _ForwardIterator, typename _BinaryPredicate>
_GLIBCXX20_CONSTEXPR
_ForwardIterator
__adjacent_find(_ForwardIterator __first, _ForwardIterator __last,
_BinaryPredicate __binary_pred)
{
if (__first == __last)
return __last;
_ForwardIterator __next = __first;
while (++__next != __last)
{
if (__binary_pred(*__first, *__next))
return __first;
__first = __next;
}
return __last;
}
template<typename _ForwardIterator, typename _BinaryPredicate>
_GLIBCXX20_CONSTEXPR
_ForwardIterator
__unique(_ForwardIterator __first, _ForwardIterator __last,
_BinaryPredicate __binary_pred)
{
// Skip the beginning, if already unique.
__first = std::__adjacent_find(__first, __last, __binary_pred);
if (__first == __last)
return __last;
// Do the real copy work.
_ForwardIterator __dest = __first;
++__first;
while (++__first != __last)
if (!__binary_pred(*__dest, *__first))
*++__dest = _GLIBCXX_MOVE(*__first);
return ++__dest;
}
/**
* @brief Remove consecutive duplicate values from a sequence.
* @ingroup mutating_algorithms
* @param __first A forward iterator.
* @param __last A forward iterator.
* @return An iterator designating the end of the resulting sequence.
*
* Removes all but the first element from each group of consecutive
* values that compare equal.
* `unique` is stable, so the relative order of elements that are
* not removed is unchanged.
* Elements between the end of the resulting sequence and `__last`
* are still present, but their value is unspecified.
*/
template<typename _ForwardIterator>
_GLIBCXX_NODISCARD _GLIBCXX20_CONSTEXPR
inline _ForwardIterator
unique(_ForwardIterator __first, _ForwardIterator __last)
{
// concept requirements
__glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
_ForwardIterator>)
__glibcxx_function_requires(_EqualityComparableConcept<
typename iterator_traits<_ForwardIterator>::value_type>)
__glibcxx_requires_valid_range(__first, __last);
return std::__unique(__first, __last, __gnu_cxx::__ops::equal_to());
}
/**
* @brief Remove consecutive values from a sequence using a predicate.
* @ingroup mutating_algorithms
* @param __first A forward iterator.
* @param __last A forward iterator.
* @param __binary_pred A binary predicate.
* @return An iterator designating the end of the resulting sequence.
*
* Removes all but the first element from each group of consecutive
* values for which `__binary_pred` returns true.
* `unique` is stable, so the relative order of elements that are
* not removed is unchanged.
* Elements between the end of the resulting sequence and `__last`
* are still present, but their value is unspecified.
*/
template<typename _ForwardIterator, typename _BinaryPredicate>
_GLIBCXX_NODISCARD _GLIBCXX20_CONSTEXPR
inline _ForwardIterator
unique(_ForwardIterator __first, _ForwardIterator __last,
_BinaryPredicate __binary_pred)
{
// concept requirements
__glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
_ForwardIterator>)
__glibcxx_function_requires(_BinaryPredicateConcept<_BinaryPredicate,
typename iterator_traits<_ForwardIterator>::value_type,
typename iterator_traits<_ForwardIterator>::value_type>)
__glibcxx_requires_valid_range(__first, __last);
return std::__unique(__first, __last, __binary_pred);
}
/// @cond undocumented
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 4269. unique_copy passes arguments to its predicate backwards
// Implementation of std::unique_copy for forward iterators.
// This case is easy, just compare *i with *(i-1).
template<typename _ForwardIterator, typename _OutputIterator,
typename _BinaryPredicate>
_GLIBCXX20_CONSTEXPR
_OutputIterator
__unique_copy(_ForwardIterator __first, _ForwardIterator __last,
_OutputIterator __result, _BinaryPredicate __binary_pred,
forward_iterator_tag)
{
_ForwardIterator __prev = __first;
*__result = *__first;
while (++__first != __last)
if (!__binary_pred(*__prev, *__first))
{
*++__result = *__first;
__prev = __first;
}
return ++__result;
}
// Implementation of std::unique_copy for non-forward iterators,
// where we cannot compare with elements written to the output.
template<typename _InputIterator, typename _OutputIterator,
typename _BinaryPredicate>
_GLIBCXX20_CONSTEXPR
_OutputIterator
__unique_copy_1(_InputIterator __first, _InputIterator __last,
_OutputIterator __result, _BinaryPredicate __binary_pred,
__false_type)
{
typedef typename iterator_traits<_InputIterator>::value_type _Val;
_Val __value = *__first;
*__result = __value;
while (++__first != __last)
if (!__binary_pred(__value, *__first))
{
__value = *__first;
*++__result = __value;
}
return ++__result;
}
// Implementation of std::unique_copy for non-forward iterators,
// where we can compare with the last element written to the output.