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// Algorithm implementation -*- C++ -*-
// Copyright (C) 2001, 2002, 2003, 2004 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 2, 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.
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING. If not, write to the Free
// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
// USA.
// As a special exception, you may use this file as part of a free software
// library without restriction. Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License. This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.
/*
*
* 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 stl_algo.h
* This is an internal header file, included by other library headers.
* You should not attempt to use it directly.
*/
#ifndef _ALGO_H
#define _ALGO_H 1
#include <bits/stl_heap.h>
#include <bits/stl_tempbuf.h> // for _Temporary_buffer
#include <debug/debug.h>
// See concept_check.h for the __glibcxx_*_requires macros.
namespace std
{
/**
* @brief Find the median of three values.
* @param a A value.
* @param b A value.
* @param c A value.
* @return One of @p a, @p b or @p c.
*
* If @c {l,m,n} is some convolution of @p {a,b,c} such that @c l<=m<=n
* then the value returned will be @c m.
* This is an SGI extension.
* @ingroup SGIextensions
*/
template<typename _Tp>
inline const _Tp&
__median(const _Tp& __a, const _Tp& __b, const _Tp& __c)
{
// concept requirements
__glibcxx_function_requires(_LessThanComparableConcept<_Tp>)
if (__a < __b)
if (__b < __c)
return __b;
else if (__a < __c)
return __c;
else
return __a;
else if (__a < __c)
return __a;
else if (__b < __c)
return __c;
else
return __b;
}
/**
* @brief Find the median of three values using a predicate for comparison.
* @param a A value.
* @param b A value.
* @param c A value.
* @param comp A binary predicate.
* @return One of @p a, @p b or @p c.
*
* If @c {l,m,n} is some convolution of @p {a,b,c} such that @p comp(l,m)
* and @p comp(m,n) are both true then the value returned will be @c m.
* This is an SGI extension.
* @ingroup SGIextensions
*/
template<typename _Tp, typename _Compare>
inline const _Tp&
__median(const _Tp& __a, const _Tp& __b, const _Tp& __c, _Compare __comp)
{
// concept requirements
__glibcxx_function_requires(_BinaryFunctionConcept<_Compare,bool,_Tp,_Tp>)
if (__comp(__a, __b))
if (__comp(__b, __c))
return __b;
else if (__comp(__a, __c))
return __c;
else
return __a;
else if (__comp(__a, __c))
return __a;
else if (__comp(__b, __c))
return __c;
else
return __b;
}
/**
* @brief Apply a function to every element of a sequence.
* @param first An input iterator.
* @param last An input iterator.
* @param f A unary function object.
* @return @p f.
*
* Applies the function object @p f to each element in the range
* @p [first,last). @p f must not modify the order of the sequence.
* If @p f has a return value it is ignored.
*/
template<typename _InputIterator, typename _Function>
_Function
for_each(_InputIterator __first, _InputIterator __last, _Function __f)
{
// concept requirements
__glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
__glibcxx_requires_valid_range(__first, __last);
for ( ; __first != __last; ++__first)
__f(*__first);
return __f;
}
/**
* @if maint
* This is an overload used by find() for the Input Iterator case.
* @endif
*/
template<typename _InputIterator, typename _Tp>
inline _InputIterator
find(_InputIterator __first, _InputIterator __last,
const _Tp& __val, input_iterator_tag)
{
while (__first != __last && !(*__first == __val))
++__first;
return __first;
}
/**
* @if maint
* This is an overload used by find_if() for the Input Iterator case.
* @endif
*/
template<typename _InputIterator, typename _Predicate>
inline _InputIterator
find_if(_InputIterator __first, _InputIterator __last,
_Predicate __pred, input_iterator_tag)
{
while (__first != __last && !__pred(*__first))
++__first;
return __first;
}
/**
* @if maint
* This is an overload used by find() for the RAI case.
* @endif
*/
template<typename _RandomAccessIterator, typename _Tp>
_RandomAccessIterator
find(_RandomAccessIterator __first, _RandomAccessIterator __last,
const _Tp& __val, random_access_iterator_tag)
{
typename iterator_traits<_RandomAccessIterator>::difference_type
__trip_count = (__last - __first) >> 2;
for ( ; __trip_count > 0 ; --__trip_count)
{
if (*__first == __val)
return __first;
++__first;
if (*__first == __val)
return __first;
++__first;
if (*__first == __val)
return __first;
++__first;
if (*__first == __val)
return __first;
++__first;
}
switch (__last - __first)
{
case 3:
if (*__first == __val)
return __first;
++__first;
case 2:
if (*__first == __val)
return __first;
++__first;
case 1:
if (*__first == __val)
return __first;
++__first;
case 0:
default:
return __last;
}
}
/**
* @if maint
* This is an overload used by find_if() for the RAI case.
* @endif
*/
template<typename _RandomAccessIterator, typename _Predicate>
_RandomAccessIterator
find_if(_RandomAccessIterator __first, _RandomAccessIterator __last,
_Predicate __pred, random_access_iterator_tag)
{
typename iterator_traits<_RandomAccessIterator>::difference_type
__trip_count = (__last - __first) >> 2;
for ( ; __trip_count > 0 ; --__trip_count)
{
if (__pred(*__first))
return __first;
++__first;
if (__pred(*__first))
return __first;
++__first;
if (__pred(*__first))
return __first;
++__first;
if (__pred(*__first))
return __first;
++__first;
}
switch (__last - __first)
{
case 3:
if (__pred(*__first))
return __first;
++__first;
case 2:
if (__pred(*__first))
return __first;
++__first;
case 1:
if (__pred(*__first))
return __first;
++__first;
case 0:
default:
return __last;
}
}
/**
* @brief Find the first occurrence of a value in a sequence.
* @param first An input iterator.
* @param last An input iterator.
* @param val The value to find.
* @return The first iterator @c i in the range @p [first,last)
* such that @c *i == @p val, or @p last if no such iterator exists.
*/
template<typename _InputIterator, typename _Tp>
inline _InputIterator
find(_InputIterator __first, _InputIterator __last,
const _Tp& __val)
{
// concept requirements
__glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
__glibcxx_function_requires(_EqualOpConcept<
typename iterator_traits<_InputIterator>::value_type, _Tp>)
__glibcxx_requires_valid_range(__first, __last);
return std::find(__first, __last, __val,
std::__iterator_category(__first));
}
/**
* @brief Find the first element in a sequence for which a predicate is true.
* @param first An input iterator.
* @param last An input iterator.
* @param pred A predicate.
* @return The first iterator @c i in the range @p [first,last)
* such that @p pred(*i) is true, or @p last if no such iterator exists.
*/
template<typename _InputIterator, typename _Predicate>
inline _InputIterator
find_if(_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(__first, __last, __pred,
std::__iterator_category(__first));
}
/**
* @brief Find two adjacent values in a sequence that are equal.
* @param first A forward iterator.
* @param last A forward iterator.
* @return The first iterator @c i such that @c i and @c i+1 are both
* valid iterators in @p [first,last) and such that @c *i == @c *(i+1),
* or @p last if no such iterator exists.
*/
template<typename _ForwardIterator>
_ForwardIterator
adjacent_find(_ForwardIterator __first, _ForwardIterator __last)
{
// concept requirements
__glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
__glibcxx_function_requires(_EqualityComparableConcept<
typename iterator_traits<_ForwardIterator>::value_type>)
__glibcxx_requires_valid_range(__first, __last);
if (__first == __last)
return __last;
_ForwardIterator __next = __first;
while(++__next != __last)
{
if (*__first == *__next)
return __first;
__first = __next;
}
return __last;
}
/**
* @brief Find two adjacent values in a sequence using a predicate.
* @param first A forward iterator.
* @param last A forward iterator.
* @param binary_pred A binary predicate.
* @return The first iterator @c i such that @c i and @c i+1 are both
* valid iterators in @p [first,last) and such that
* @p binary_pred(*i,*(i+1)) is true, or @p last if no such iterator
* exists.
*/
template<typename _ForwardIterator, typename _BinaryPredicate>
_ForwardIterator
adjacent_find(_ForwardIterator __first, _ForwardIterator __last,
_BinaryPredicate __binary_pred)
{
// concept requirements
__glibcxx_function_requires(_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);
if (__first == __last)
return __last;
_ForwardIterator __next = __first;
while(++__next != __last)
{
if (__binary_pred(*__first, *__next))
return __first;
__first = __next;
}
return __last;
}
/**
* @brief Count the number of copies of a value in a sequence.
* @param first An input iterator.
* @param last An input iterator.
* @param value The value to be counted.
* @return The number of iterators @c i in the range @p [first,last)
* for which @c *i == @p value
*/
template<typename _InputIterator, typename _Tp>
typename iterator_traits<_InputIterator>::difference_type
count(_InputIterator __first, _InputIterator __last, const _Tp& __value)
{
// concept requirements
__glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
__glibcxx_function_requires(_EqualityComparableConcept<
typename iterator_traits<_InputIterator>::value_type >)
__glibcxx_function_requires(_EqualityComparableConcept<_Tp>)
__glibcxx_requires_valid_range(__first, __last);
typename iterator_traits<_InputIterator>::difference_type __n = 0;
for ( ; __first != __last; ++__first)
if (*__first == __value)
++__n;
return __n;
}
/**
* @brief Count the elements of a sequence for which a predicate is true.
* @param first An input iterator.
* @param last An input iterator.
* @param pred A predicate.
* @return The number of iterators @c i in the range @p [first,last)
* for which @p pred(*i) is true.
*/
template<typename _InputIterator, typename _Predicate>
typename iterator_traits<_InputIterator>::difference_type
count_if(_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);
typename iterator_traits<_InputIterator>::difference_type __n = 0;
for ( ; __first != __last; ++__first)
if (__pred(*__first))
++__n;
return __n;
}
/**
* @brief Search a sequence for a matching sub-sequence.
* @param first1 A forward iterator.
* @param last1 A forward iterator.
* @param first2 A forward iterator.
* @param last2 A forward iterator.
* @return The first iterator @c i in the range
* @p [first1,last1-(last2-first2)) such that @c *(i+N) == @p *(first2+N)
* for each @c N in the range @p [0,last2-first2), or @p last1 if no
* such iterator exists.
*
* Searches the range @p [first1,last1) for a sub-sequence that compares
* equal value-by-value with the sequence given by @p [first2,last2) and
* returns an iterator to the first element of the sub-sequence, or
* @p last1 if the sub-sequence is not found.
*
* Because the sub-sequence must lie completely within the range
* @p [first1,last1) it must start at a position less than
* @p last1-(last2-first2) where @p last2-first2 is the length of the
* sub-sequence.
* This means that the returned iterator @c i will be in the range
* @p [first1,last1-(last2-first2))
*/
template<typename _ForwardIterator1, typename _ForwardIterator2>
_ForwardIterator1
search(_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);
// Test for empty ranges
if (__first1 == __last1 || __first2 == __last2)
return __first1;
// Test for a pattern of length 1.
_ForwardIterator2 __tmp(__first2);
++__tmp;
if (__tmp == __last2)
return std::find(__first1, __last1, *__first2);
// General case.
_ForwardIterator2 __p1, __p;
__p1 = __first2; ++__p1;
_ForwardIterator1 __current = __first1;
while (__first1 != __last1)
{
__first1 = std::find(__first1, __last1, *__first2);
if (__first1 == __last1)
return __last1;
__p = __p1;
__current = __first1;
if (++__current == __last1)
return __last1;
while (*__current == *__p)
{
if (++__p == __last2)
return __first1;
if (++__current == __last1)
return __last1;
}
++__first1;
}
return __first1;
}
/**
* @brief Search a sequence for a matching sub-sequence using a predicate.
* @param first1 A forward iterator.
* @param last1 A forward iterator.
* @param first2 A forward iterator.
* @param last2 A forward iterator.
* @param predicate A binary predicate.
* @return The first iterator @c i in the range
* @p [first1,last1-(last2-first2)) such that
* @p predicate(*(i+N),*(first2+N)) is true for each @c N in the range
* @p [0,last2-first2), or @p last1 if no such iterator exists.
*
* Searches the range @p [first1,last1) for a sub-sequence that compares
* equal value-by-value with the sequence given by @p [first2,last2),
* using @p predicate to determine equality, and returns an iterator
* to the first element of the sub-sequence, or @p last1 if no such
* iterator exists.
*
* @see search(_ForwardIter1, _ForwardIter1, _ForwardIter2, _ForwardIter2)
*/
template<typename _ForwardIterator1, typename _ForwardIterator2,
typename _BinaryPredicate>
_ForwardIterator1
search(_ForwardIterator1 __first1, _ForwardIterator1 __last1,
_ForwardIterator2 __first2, _ForwardIterator2 __last2,
_BinaryPredicate __predicate)
{
// 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);
// Test for empty ranges
if (__first1 == __last1 || __first2 == __last2)
return __first1;
// Test for a pattern of length 1.
_ForwardIterator2 __tmp(__first2);
++__tmp;
if (__tmp == __last2)
{
while (__first1 != __last1 && !__predicate(*__first1, *__first2))
++__first1;
return __first1;
}
// General case.
_ForwardIterator2 __p1, __p;
__p1 = __first2; ++__p1;
_ForwardIterator1 __current = __first1;
while (__first1 != __last1)
{
while (__first1 != __last1)
{
if (__predicate(*__first1, *__first2))
break;
++__first1;
}
while (__first1 != __last1 && !__predicate(*__first1, *__first2))
++__first1;
if (__first1 == __last1)
return __last1;
__p = __p1;
__current = __first1;
if (++__current == __last1)
return __last1;
while (__predicate(*__current, *__p))
{
if (++__p == __last2)
return __first1;
if (++__current == __last1)
return __last1;
}
++__first1;
}
return __first1;
}
/**
* @brief Search a sequence for a number of consecutive values.
* @param first A forward iterator.
* @param last A forward iterator.
* @param count The number of consecutive values.
* @param val The value to find.
* @return The first iterator @c i in the range @p [first,last-count)
* such that @c *(i+N) == @p val for each @c N in the range @p [0,count),
* or @p last if no such iterator exists.
*
* Searches the range @p [first,last) for @p count consecutive elements
* equal to @p val.
*/
template<typename _ForwardIterator, typename _Integer, typename _Tp>
_ForwardIterator
search_n(_ForwardIterator __first, _ForwardIterator __last,
_Integer __count, const _Tp& __val)
{
// concept requirements
__glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
__glibcxx_function_requires(_EqualityComparableConcept<
typename iterator_traits<_ForwardIterator>::value_type>)
__glibcxx_function_requires(_EqualityComparableConcept<_Tp>)
__glibcxx_requires_valid_range(__first, __last);
if (__count <= 0)
return __first;
else
{
__first = std::find(__first, __last, __val);
while (__first != __last)
{
typename iterator_traits<_ForwardIterator>::difference_type
__n = __count;
_ForwardIterator __i = __first;
++__i;
while (__i != __last && __n != 1 && *__i == __val)
{
++__i;
--__n;
}
if (__n == 1)
return __first;
else
__first = std::find(__i, __last, __val);
}
return __last;
}
}
/**
* @brief Search a sequence for a number of consecutive values using a
* predicate.
* @param first A forward iterator.
* @param last A forward iterator.
* @param count The number of consecutive values.
* @param val The value to find.
* @param binary_pred A binary predicate.
* @return The first iterator @c i in the range @p [first,last-count)
* such that @p binary_pred(*(i+N),val) is true for each @c N in the
* range @p [0,count), or @p last if no such iterator exists.
*
* Searches the range @p [first,last) for @p count consecutive elements
* for which the predicate returns true.
*/
template<typename _ForwardIterator, typename _Integer, typename _Tp,
typename _BinaryPredicate>
_ForwardIterator
search_n(_ForwardIterator __first, _ForwardIterator __last,
_Integer __count, const _Tp& __val,
_BinaryPredicate __binary_pred)
{
// concept requirements
__glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
__glibcxx_function_requires(_BinaryPredicateConcept<_BinaryPredicate,
typename iterator_traits<_ForwardIterator>::value_type, _Tp>)
__glibcxx_requires_valid_range(__first, __last);
if (__count <= 0)
return __first;
else
{
while (__first != __last)
{
if (__binary_pred(*__first, __val))
break;
++__first;
}
while (__first != __last)
{
typename iterator_traits<_ForwardIterator>::difference_type
__n = __count;
_ForwardIterator __i = __first;
++__i;
while (__i != __last && __n != 1 && __binary_pred(*__i, __val))
{
++__i;
--__n;
}
if (__n == 1)
return __first;
else
{
while (__i != __last)
{
if (__binary_pred(*__i, __val))
break;
++__i;
}
__first = __i;
}
}
return __last;
}
}
/**
* @brief Swap the elements of two sequences.
* @param first1 A forward iterator.
* @param last1 A forward iterator.
* @param first2 A forward iterator.
* @return An iterator equal to @p first2+(last1-first1).
*
* Swaps each element in the range @p [first1,last1) with the
* corresponding element in the range @p [first2,(last1-first1)).
* The ranges must not overlap.
*/
template<typename _ForwardIterator1, typename _ForwardIterator2>
_ForwardIterator2
swap_ranges(_ForwardIterator1 __first1, _ForwardIterator1 __last1,
_ForwardIterator2 __first2)
{
// concept requirements
__glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
_ForwardIterator1>)
__glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
_ForwardIterator2>)
__glibcxx_function_requires(_ConvertibleConcept<
typename iterator_traits<_ForwardIterator1>::value_type,
typename iterator_traits<_ForwardIterator2>::value_type>)
__glibcxx_function_requires(_ConvertibleConcept<
typename iterator_traits<_ForwardIterator2>::value_type,
typename iterator_traits<_ForwardIterator1>::value_type>)
__glibcxx_requires_valid_range(__first1, __last1);
for ( ; __first1 != __last1; ++__first1, ++__first2)
std::iter_swap(__first1, __first2);
return __first2;
}
/**
* @brief Perform an operation on a sequence.
* @param first An input iterator.
* @param last An input iterator.
* @param result An output iterator.
* @param unary_op A unary operator.
* @return An output iterator equal to @p result+(last-first).
*
* Applies the operator to each element in the input range and assigns
* the results to successive elements of the output sequence.
* Evaluates @p *(result+N)=unary_op(*(first+N)) for each @c N in the
* range @p [0,last-first).
*
* @p unary_op must not alter its argument.
*/
template<typename _InputIterator, typename _OutputIterator,
typename _UnaryOperation>
_OutputIterator
transform(_InputIterator __first, _InputIterator __last,
_OutputIterator __result, _UnaryOperation __unary_op)
{
// concept requirements
__glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
__glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
// "the type returned by a _UnaryOperation"
__typeof__(__unary_op(*__first))>)
__glibcxx_requires_valid_range(__first, __last);
for ( ; __first != __last; ++__first, ++__result)
*__result = __unary_op(*__first);
return __result;
}
/**
* @brief Perform an operation on corresponding elements of two sequences.
* @param first1 An input iterator.
* @param last1 An input iterator.
* @param first2 An input iterator.
* @param result An output iterator.
* @param binary_op A binary operator.
* @return An output iterator equal to @p result+(last-first).
*
* Applies the operator to the corresponding elements in the two
* input ranges and assigns the results to successive elements of the
* output sequence.
* Evaluates @p *(result+N)=binary_op(*(first1+N),*(first2+N)) for each
* @c N in the range @p [0,last1-first1).
*
* @p binary_op must not alter either of its arguments.
*/
template<typename _InputIterator1, typename _InputIterator2,
typename _OutputIterator, typename _BinaryOperation>
_OutputIterator
transform(_InputIterator1 __first1, _InputIterator1 __last1,
_InputIterator2 __first2, _OutputIterator __result,
_BinaryOperation __binary_op)
{
// concept requirements
__glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
__glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
__glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
// "the type returned by a _BinaryOperation"
__typeof__(__binary_op(*__first1,*__first2))>)
__glibcxx_requires_valid_range(__first1, __last1);
for ( ; __first1 != __last1; ++__first1, ++__first2, ++__result)
*__result = __binary_op(*__first1, *__first2);
return __result;
}
/**
* @brief Replace each occurrence of one value in a sequence with another
* value.
* @param first A forward iterator.
* @param last A forward iterator.
* @param old_value The value to be replaced.
* @param new_value The replacement value.
* @return replace() returns no value.
*
* For each iterator @c i in the range @p [first,last) if @c *i ==
* @p old_value then the assignment @c *i = @p new_value is performed.
*/
template<typename _ForwardIterator, typename _Tp>
void
replace(_ForwardIterator __first, _ForwardIterator __last,
const _Tp& __old_value, const _Tp& __new_value)
{
// concept requirements
__glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
_ForwardIterator>)
__glibcxx_function_requires(_EqualOpConcept<
typename iterator_traits<_ForwardIterator>::value_type, _Tp>)
__glibcxx_function_requires(_ConvertibleConcept<_Tp,
typename iterator_traits<_ForwardIterator>::value_type>)
__glibcxx_requires_valid_range(__first, __last);
for ( ; __first != __last; ++__first)
if (*__first == __old_value)
*__first = __new_value;
}
/**
* @brief Replace each value in a sequence for which a predicate returns
* true with another value.
* @param first A forward iterator.
* @param last A forward iterator.
* @param pred A predicate.
* @param new_value The replacement value.
* @return replace_if() returns no value.
*
* For each iterator @c i in the range @p [first,last) if @p pred(*i)
* is true then the assignment @c *i = @p new_value is performed.
*/
template<typename _ForwardIterator, typename _Predicate, typename _Tp>
void
replace_if(_ForwardIterator __first, _ForwardIterator __last,
_Predicate __pred, const _Tp& __new_value)
{
// concept requirements
__glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
_ForwardIterator>)
__glibcxx_function_requires(_ConvertibleConcept<_Tp,
typename iterator_traits<_ForwardIterator>::value_type>)
__glibcxx_function_requires(_UnaryPredicateConcept<_Predicate,
typename iterator_traits<_ForwardIterator>::value_type>)
__glibcxx_requires_valid_range(__first, __last);
for ( ; __first != __last; ++__first)
if (__pred(*__first))
*__first = __new_value;
}
/**
* @brief Copy a sequence, replacing each element of one value with another
* value.
* @param first An input iterator.
* @param last An input iterator.
* @param result An output iterator.
* @param old_value The value to be replaced.
* @param new_value The replacement value.
* @return The end of the output sequence, @p result+(last-first).
*
* Copies each element in the input range @p [first,last) to the
* output range @p [result,result+(last-first)) replacing elements
* equal to @p old_value with @p new_value.
*/
template<typename _InputIterator, typename _OutputIterator, typename _Tp>
_OutputIterator
replace_copy(_InputIterator __first, _InputIterator __last,
_OutputIterator __result,
const _Tp& __old_value, const _Tp& __new_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);
for ( ; __first != __last; ++__first, ++__result)
*__result = *__first == __old_value ? __new_value : *__first;
return __result;
}
/**
* @brief Copy a sequence, replacing each value for which a predicate
* returns true with another value.
* @param first An input iterator.
* @param last An input iterator.
* @param result An output iterator.
* @param pred A predicate.
* @param new_value The replacement value.
* @return The end of the output sequence, @p result+(last-first).
*
* Copies each element in the range @p [first,last) to the range
* @p [result,result+(last-first)) replacing elements for which
* @p pred returns true with @p new_value.
*/
template<typename _InputIterator, typename _OutputIterator,
typename _Predicate, typename _Tp>
_OutputIterator
replace_copy_if(_InputIterator __first, _InputIterator __last,
_OutputIterator __result,
_Predicate __pred, const _Tp& __new_value)
{
// 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, ++__result)
*__result = __pred(*__first) ? __new_value : *__first;
return __result;
}
/**
* @brief Assign the result of a function object to each value in a
* sequence.
* @param first A forward iterator.
* @param last A forward iterator.
* @param gen A function object taking no arguments.
* @return generate() returns no value.
*
* Performs the assignment @c *i = @p gen() for each @c i in the range
* @p [first,last).
*/
template<typename _ForwardIterator, typename _Generator>
void
generate(_ForwardIterator __first, _ForwardIterator __last,
_Generator __gen)
{
// concept requirements
__glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
__glibcxx_function_requires(_GeneratorConcept<_Generator,
typename iterator_traits<_ForwardIterator>::value_type>)
__glibcxx_requires_valid_range(__first, __last);
for ( ; __first != __last; ++__first)
*__first = __gen();
}
/**
* @brief Assign the result of a function object to each value in a
* sequence.
* @param first A forward iterator.
* @param n The length of the sequence.
* @param gen A function object taking no arguments.
* @return The end of the sequence, @p first+n
*
* Performs the assignment @c *i = @p gen() for each @c i in the range
* @p [first,first+n).
*/
template<typename _OutputIterator, typename _Size, typename _Generator>
_OutputIterator
generate_n(_OutputIterator __first, _Size __n, _Generator __gen)
{
// concept requirements
__glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
// "the type returned by a _Generator"
__typeof__(__gen())>)
for ( ; __n > 0; --__n, ++__first)
*__first = __gen();
return __first;
}
/**
* @brief Copy a sequence, removing elements of a given value.
* @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 @p [first,last) not equal to @p value
* to the range beginning at @p result.
* remove_copy() is stable, so the relative order of elements that are
* copied is unchanged.
*/
template<typename _InputIterator, typename _OutputIterator, typename _Tp>
_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);
for ( ; __first != __last; ++__first)
if (!(*__first == __value))
{
*__result = *__first;
++__result;
}
return __result;
}
/**
* @brief Copy a sequence, removing elements for which a predicate is true.
* @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 @p [first,last) for which
* @p pred returns true to the range beginning at @p result.
*
* remove_copy_if() is stable, so the relative order of elements that are
* copied is unchanged.
*/
template<typename _InputIterator, typename _OutputIterator,
typename _Predicate>
_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);
for ( ; __first != __last; ++__first)
if (!__pred(*__first))
{
*__result = *__first;
++__result;
}
return __result;
}
/**
* @brief Remove elements from a sequence.
* @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 @p value are removed from the range
* @p [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 @p last
* are still present, but their value is unspecified.
*/
template<typename _ForwardIterator, typename _Tp>
_ForwardIterator
remove(_ForwardIterator __first, _ForwardIterator __last,
const _Tp& __value)
{
// concept requirements
__glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
_ForwardIterator>)
__glibcxx_function_requires(_ConvertibleConcept<_Tp,
typename iterator_traits<_ForwardIterator>::value_type>)
__glibcxx_function_requires(_EqualOpConcept<
typename iterator_traits<_ForwardIterator>::value_type, _Tp>)
__glibcxx_requires_valid_range(__first, __last);
__first = std::find(__first, __last, __value);
_ForwardIterator __i = __first;
return __first == __last ? __first
: std::remove_copy(++__i, __last,
__first, __value);
}
/**
* @brief Remove elements from a sequence using a predicate.
* @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 @p pred returns true are removed from the range
* @p [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 @p last
* are still present, but their value is unspecified.
*/
template<typename _ForwardIterator, typename _Predicate>
_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);
__first = std::find_if(__first, __last, __pred);
_ForwardIterator __i = __first;
return __first == __last ? __first
: std::remove_copy_if(++__i, __last,
__first, __pred);
}
/**
* @if maint
* This is an uglified unique_copy(_InputIterator, _InputIterator,
* _OutputIterator)
* overloaded for output iterators.
* @endif
*/
template<typename _InputIterator, typename _OutputIterator>
_OutputIterator
__unique_copy(_InputIterator __first, _InputIterator __last,
_OutputIterator __result,
output_iterator_tag)
{
// concept requirements -- taken care of in dispatching function
typename iterator_traits<_InputIterator>::value_type __value = *__first;
*__result = __value;
while (++__first != __last)
if (!(__value == *__first))
{
__value = *__first;
*++__result = __value;
}
return ++__result;
}
/**
* @if maint
* This is an uglified unique_copy(_InputIterator, _InputIterator,
* _OutputIterator)
* overloaded for forward iterators.
* @endif
*/
template<typename _InputIterator, typename _ForwardIterator>
_ForwardIterator
__unique_copy(_InputIterator __first, _InputIterator __last,
_ForwardIterator __result,
forward_iterator_tag)
{
// concept requirements -- taken care of in dispatching function
*__result = *__first;
while (++__first != __last)
if (!(*__result == *__first))
*++__result = *__first;
return ++__result;
}
/**
* @if maint
* This is an uglified
* unique_copy(_InputIterator, _InputIterator, _OutputIterator,
* _BinaryPredicate)
* overloaded for output iterators.
* @endif
*/
template<typename _InputIterator, typename _OutputIterator,
typename _BinaryPredicate>
_OutputIterator
__unique_copy(_InputIterator __first, _InputIterator __last,
_OutputIterator __result,
_BinaryPredicate __binary_pred,
output_iterator_tag)
{
// concept requirements -- iterators already checked
__glibcxx_function_requires(_BinaryPredicateConcept<_BinaryPredicate,
typename iterator_traits<_InputIterator>::value_type,
typename iterator_traits<_InputIterator>::value_type>)
typename iterator_traits<_InputIterator>::value_type __value = *__first;
*__result = __value;
while (++__first != __last)
if (!__binary_pred(__value, *__first))
{
__value = *__first;
*++__result = __value;
}
return ++__result;
}
/**
* @if maint
* This is an uglified
* unique_copy(_InputIterator, _InputIterator, _OutputIterator,
* _BinaryPredicate)
* overloaded for forward iterators.
* @endif
*/
template<typename _InputIterator, typename _ForwardIterator,
typename _BinaryPredicate>
_ForwardIterator
__unique_copy(_InputIterator __first, _InputIterator __last,
_ForwardIterator __result,
_BinaryPredicate __binary_pred,
forward_iterator_tag)
{
// concept requirements -- iterators already checked
__glibcxx_function_requires(_BinaryPredicateConcept<_BinaryPredicate,
typename iterator_traits<_ForwardIterator>::value_type,
typename iterator_traits<_InputIterator>::value_type>)
*__result = *__first;
while (++__first != __last)
if (!__binary_pred(*__result, *__first)) *++__result = *__first;
return ++__result;
}
/**
* @brief Copy a sequence, removing consecutive duplicate values.
* @param first An input iterator.
* @param last An input iterator.
* @param result An output iterator.
* @return An iterator designating the end of the resulting sequence.
*
* Copies each element in the range @p [first,last) to the range
* beginning at @p result, except that only the first element is copied
* from groups of consecutive elements that compare equal.
* unique_copy() is stable, so the relative order of elements that are
* copied is unchanged.
*/
template<typename _InputIterator, typename _OutputIterator>
inline _OutputIterator
unique_copy(_InputIterator __first, _InputIterator __last,
_OutputIterator __result)
{
// concept requirements
__glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
__glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
typename iterator_traits<_InputIterator>::value_type>)
__glibcxx_function_requires(_EqualityComparableConcept<
typename iterator_traits<_InputIterator>::value_type>)
__glibcxx_requires_valid_range(__first, __last);
typedef typename iterator_traits<_OutputIterator>::iterator_category
_IterType;
if (__first == __last) return __result;
return std::__unique_copy(__first, __last, __result, _IterType());
}
/**
* @brief Copy a sequence, removing consecutive values using a predicate.
* @param first An input iterator.
* @param last An input iterator.
* @param result An output iterator.
* @param binary_pred A binary predicate.
* @return An iterator designating the end of the resulting sequence.
*
* Copies each element in the range @p [first,last) to the range
* beginning at @p result, except that only the first element is copied
* from groups of consecutive elements for which @p binary_pred returns
* true.
* unique_copy() is stable, so the relative order of elements that are
* copied is unchanged.
*/
template<typename _InputIterator, typename _OutputIterator,
typename _BinaryPredicate>
inline _OutputIterator
unique_copy(_InputIterator __first, _InputIterator __last,
_OutputIterator __result,
_BinaryPredicate __binary_pred)
{
// concept requirements -- predicates checked later
__glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
__glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
typename iterator_traits<_InputIterator>::value_type>)
__glibcxx_requires_valid_range(__first, __last);
typedef typename iterator_traits<_OutputIterator>::iterator_category
_IterType;
if (__first == __last) return __result;
return std::__unique_copy(__first, __last, __result,
__binary_pred, _IterType());
}
/**
* @brief Remove consecutive duplicate values from a sequence.
* @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 @p last
* are still present, but their value is unspecified.
*/
template<typename _ForwardIterator>
_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);
// Skip the beginning, if already unique.
__first = std::adjacent_find(__first, __last);
if (__first == __last)
return __last;
// Do the real copy work.
_ForwardIterator __dest = __first;
++__first;
while (++__first != __last)
if (!(*__dest == *__first))
*++__dest = *__first;
return ++__dest;
}
/**
* @brief Remove consecutive values from a sequence using a predicate.
* @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 @p 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 @p last
* are still present, but their value is unspecified.
*/
template<typename _ForwardIterator, typename _BinaryPredicate>
_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);
// 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 = *__first;
return ++__dest;
}
/**
* @if maint
* This is an uglified reverse(_BidirectionalIterator,
* _BidirectionalIterator)
* overloaded for bidirectional iterators.
* @endif
*/
template<typename _BidirectionalIterator>
void
__reverse(_BidirectionalIterator __first, _BidirectionalIterator __last,
bidirectional_iterator_tag)
{
while (true)
if (__first == __last || __first == --__last)
return;
else
std::iter_swap(__first++, __last);
}
/**
* @if maint
* This is an uglified reverse(_BidirectionalIterator,
* _BidirectionalIterator)
* overloaded for bidirectional iterators.
* @endif
*/
template<typename _RandomAccessIterator>
void
__reverse(_RandomAccessIterator __first, _RandomAccessIterator __last,
random_access_iterator_tag)
{
while (__first < __last)
std::iter_swap(__first++, --__last);
}
/**
* @brief Reverse a sequence.
* @param first A bidirectional iterator.
* @param last A bidirectional iterator.
* @return reverse() returns no value.
*
* Reverses the order of the elements in the range @p [first,last),
* so that the first element becomes the last etc.
* For every @c i such that @p 0<=i<=(last-first)/2), @p reverse()
* swaps @p *(first+i) and @p *(last-(i+1))
*/
template<typename _BidirectionalIterator>
inline void
reverse(_BidirectionalIterator __first, _BidirectionalIterator __last)
{
// concept requirements
__glibcxx_function_requires(_Mutable_BidirectionalIteratorConcept<
_BidirectionalIterator>)
__glibcxx_requires_valid_range(__first, __last);
std::__reverse(__first, __last, std::__iterator_category(__first));
}
/**
* @brief Copy a sequence, reversing its elements.
* @param first A bidirectional iterator.
* @param last A bidirectional iterator.
* @param result An output iterator.
* @return An iterator designating the end of the resulting sequence.
*
* Copies the elements in the range @p [first,last) to the range
* @p [result,result+(last-first)) such that the order of the
* elements is reversed.
* For every @c i such that @p 0<=i<=(last-first), @p reverse_copy()
* performs the assignment @p *(result+(last-first)-i) = *(first+i).
* The ranges @p [first,last) and @p [result,result+(last-first))
* must not overlap.
*/
template<typename _BidirectionalIterator, typename _OutputIterator>
_OutputIterator
reverse_copy(_BidirectionalIterator __first, _BidirectionalIterator __last,
_OutputIterator __result)
{
// concept requirements
__glibcxx_function_requires(_BidirectionalIteratorConcept<
_BidirectionalIterator>)
__glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
typename iterator_traits<_BidirectionalIterator>::value_type>)
__glibcxx_requires_valid_range(__first, __last);
while (__first != __last)
{
--__last;
*__result = *__last;
++__result;
}
return __result;
}
/**
* @if maint
* This is a helper function for the rotate algorithm specialized on RAIs.
* It returns the greatest common divisor of two integer values.
* @endif
*/
template<typename _EuclideanRingElement>
_EuclideanRingElement
__gcd(_EuclideanRingElement __m, _EuclideanRingElement __n)
{
while (__n != 0)
{
_EuclideanRingElement __t = __m % __n;
__m = __n;
__n = __t;
}
return __m;
}
/**
* @if maint
* This is a helper function for the rotate algorithm.
* @endif
*/
template<typename _ForwardIterator>
void
__rotate(_ForwardIterator __first,
_ForwardIterator __middle,
_ForwardIterator __last,
forward_iterator_tag)
{
if ((__first == __middle) || (__last == __middle))
return;
_ForwardIterator __first2 = __middle;
do
{
swap(*__first++, *__first2++);
if (__first == __middle)
__middle = __first2;
}
while (__first2 != __last);
__first2 = __middle;
while (__first2 != __last)
{
swap(*__first++, *__first2++);
if (__first == __middle)
__middle = __first2;
else if (__first2 == __last)
__first2 = __middle;
}
}
/**
* @if maint
* This is a helper function for the rotate algorithm.
* @endif
*/
template<typename _BidirectionalIterator>
void
__rotate(_BidirectionalIterator __first,
_BidirectionalIterator __middle,
_BidirectionalIterator __last,
bidirectional_iterator_tag)
{
// concept requirements
__glibcxx_function_requires(_Mutable_BidirectionalIteratorConcept<
_BidirectionalIterator>)
if ((__first == __middle) || (__last == __middle))
return;
std::__reverse(__first, __middle, bidirectional_iterator_tag());
std::__reverse(__middle, __last, bidirectional_iterator_tag());
while (__first != __middle && __middle != __last)
swap(*__first++, *--__last);
if (__first == __middle)
std::__reverse(__middle, __last, bidirectional_iterator_tag());
else
std::__reverse(__first, __middle, bidirectional_iterator_tag());
}
/**
* @if maint
* This is a helper function for the rotate algorithm.
* @endif
*/
template<typename _RandomAccessIterator>
void
__rotate(_RandomAccessIterator __first,
_RandomAccessIterator __middle,
_RandomAccessIterator __last,
random_access_iterator_tag)
{
// concept requirements
__glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<
_RandomAccessIterator>)
if ((__first == __middle) || (__last == __middle))
return;
typedef typename iterator_traits<_RandomAccessIterator>::difference_type
_Distance;
typedef typename iterator_traits<_RandomAccessIterator>::value_type
_ValueType;
const _Distance __n = __last - __first;
const _Distance __k = __middle - __first;
const _Distance __l = __n - __k;
if (__k == __l)
{
std::swap_ranges(__first, __middle, __middle);
return;
}
const _Distance __d = __gcd(__n, __k);
for (_Distance __i = 0; __i < __d; __i++)
{
const _ValueType __tmp = *__first;
_RandomAccessIterator __p = __first;
if (__k < __l)
{
for (_Distance __j = 0; __j < __l / __d; __j++)
{
if (__p > __first + __l)
{
*__p = *(__p - __l);
__p -= __l;
}
*__p = *(__p + __k);
__p += __k;
}
}
else
{
for (_Distance __j = 0; __j < __k / __d - 1; __j ++)
{
if (__p < __last - __k)
{
*__p = *(__p + __k);
__p += __k;
}
*__p = * (__p - __l);
__p -= __l;
}
}
*__p = __tmp;
++__first;
}
}
/**
* @brief Rotate the elements of a sequence.
* @param first A forward iterator.
* @param middle A forward iterator.
* @param last A forward iterator.
* @return Nothing.
*
* Rotates the elements of the range @p [first,last) by @p (middle-first)
* positions so that the element at @p middle is moved to @p first, the
* element at @p middle+1 is moved to @first+1 and so on for each element
* in the range @p [first,last).
*
* This effectively swaps the ranges @p [first,middle) and
* @p [middle,last).
*
* Performs @p *(first+(n+(last-middle))%(last-first))=*(first+n) for
* each @p n in the range @p [0,last-first).
*/
template<typename _ForwardIterator>
inline void
rotate(_ForwardIterator __first, _ForwardIterator __middle,
_ForwardIterator __last)
{
// concept requirements
__glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
_ForwardIterator>)
__glibcxx_requires_valid_range(__first, __middle);
__glibcxx_requires_valid_range(__middle, __last);
typedef typename iterator_traits<_ForwardIterator>::iterator_category
_IterType;
std::__rotate(__first, __middle, __last, _IterType());
}
/**
* @brief Copy a sequence, rotating its elements.
* @param first A forward iterator.
* @param middle A forward iterator.
* @param last A forward iterator.
* @param result An output iterator.
* @return An iterator designating the end of the resulting sequence.
*
* Copies the elements of the range @p [first,last) to the range
* beginning at @result, rotating the copied elements by @p (middle-first)
* positions so that the element at @p middle is moved to @p result, the
* element at @p middle+1 is moved to @result+1 and so on for each element
* in the range @p [first,last).
*
* Performs @p *(result+(n+(last-middle))%(last-first))=*(first+n) for
* each @p n in the range @p [0,last-first).
*/
template<typename _ForwardIterator, typename _OutputIterator>
_OutputIterator
rotate_copy(_ForwardIterator __first, _ForwardIterator __middle,
_ForwardIterator __last, _OutputIterator __result)
{
// concept requirements
__glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
__glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
typename iterator_traits<_ForwardIterator>::value_type>)
__glibcxx_requires_valid_range(__first, __middle);
__glibcxx_requires_valid_range(__middle, __last);
return std::copy(__first, __middle, copy(__middle, __last, __result));
}
/**
* @brief Randomly shuffle the elements of a sequence.
* @param first A forward iterator.
* @param last A forward iterator.
* @return Nothing.
*
* Reorder the elements in the range @p [first,last) using a random
* distribution, so that every possible ordering of the sequence is
* equally likely.
*/
template<typename _RandomAccessIterator>
inline void
random_shuffle(_RandomAccessIterator __first, _RandomAccessIterator __last)
{
// concept requirements
__glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<
_RandomAccessIterator>)
__glibcxx_requires_valid_range(__first, __last);
if (__first != __last)
for (_RandomAccessIterator __i = __first + 1; __i != __last; ++__i)
std::iter_swap(__i, __first + (std::rand() % ((__i - __first) + 1)));
}
/**
* @brief Shuffle the elements of a sequence using a random number
* generator.
* @param first A forward iterator.
* @param last A forward iterator.
* @param rand The RNG functor or function.
* @return Nothing.
*
* Reorders the elements in the range @p [first,last) using @p rand to
* provide a random distribution. Calling @p rand(N) for a positive
* integer @p N should return a randomly chosen integer from the
* range [0,N).
*/
template<typename _RandomAccessIterator, typename _RandomNumberGenerator>
void
random_shuffle(_RandomAccessIterator __first, _RandomAccessIterator __last,
_RandomNumberGenerator& __rand)
{
// concept requirements
__glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<
_RandomAccessIterator>)
__glibcxx_requires_valid_range(__first, __last);
if (__first == __last)
return;
for (_RandomAccessIterator __i = __first + 1; __i != __last; ++__i)
std::iter_swap(__i, __first + __rand((__i - __first) + 1));
}
/**
* @if maint
* This is a helper function...
* @endif
*/
template<typename _ForwardIterator, typename _Predicate>
_ForwardIterator
__partition(_ForwardIterator __first, _ForwardIterator __last,
_Predicate __pred,
forward_iterator_tag)
{
if (__first == __last)
return __first;
while (__pred(*__first))
if (++__first == __last)
return __first;
_ForwardIterator __next = __first;
while (++__next != __last)
if (__pred(*__next))
{
swap(*__first, *__next);
++__first;
}
return __first;
}
/**
* @if maint
* This is a helper function...
* @endif
*/
template<typename _BidirectionalIterator, typename _Predicate>
_BidirectionalIterator
__partition(_BidirectionalIterator __first, _BidirectionalIterator __last,
_Predicate __pred,
bidirectional_iterator_tag)
{
while (true)
{
while (true)
if (__first == __last)
return __first;
else if (__pred(*__first))
++__first;
else
break;
--__last;
while (true)
if (__first == __last)
return __first;
else if (!__pred(*__last))
--__last;
else
break;
std::iter_swap(__first, __last);
++__first;
}
}
/**
* @brief Move elements for which a predicate is true to the beginning
* of a sequence.
* @param first A forward iterator.
* @param last A forward iterator.
* @param pred A predicate functor.
* @return An iterator @p middle such that @p pred(i) is true for each
* iterator @p i in the range @p [first,middle) and false for each @p i
* in the range @p [middle,last).
*
* @p pred must not modify its operand. @p partition() does not preserve
* the relative ordering of elements in each group, use
* @p stable_partition() if this is needed.
*/
template<typename _ForwardIterator, typename _Predicate>
inline _ForwardIterator
partition(_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::__partition(__first, __last, __pred,
std::__iterator_category(__first));
}
/**
* @if maint
* This is a helper function...
* @endif
*/
template<typename _ForwardIterator, typename _Predicate, typename _Distance>
_ForwardIterator
__inplace_stable_partition(_ForwardIterator __first,
_ForwardIterator __last,
_Predicate __pred, _Distance __len)
{
if (__len == 1)
return __pred(*__first) ? __last : __first;
_ForwardIterator __middle = __first;
std::advance(__middle, __len / 2);
_ForwardIterator __begin = std::__inplace_stable_partition(__first,
__middle,
__pred,
__len / 2);
_ForwardIterator __end = std::__inplace_stable_partition(__middle, __last,
__pred,
__len
- __len / 2);
std::rotate(__begin, __middle, __end);
std::advance(__begin, std::distance(__middle, __end));
return __begin;
}
/**
* @if maint
* This is a helper function...
* @endif
*/
template<typename _ForwardIterator, typename _Pointer, typename _Predicate,
typename _Distance>
_ForwardIterator
__stable_partition_adaptive(_ForwardIterator __first,
_ForwardIterator __last,
_Predicate __pred, _Distance __len,
_Pointer __buffer,
_Distance __buffer_size)
{
if (__len <= __buffer_size)
{
_ForwardIterator __result1 = __first;
_Pointer __result2 = __buffer;
for ( ; __first != __last ; ++__first)
if (__pred(*__first))
{
*__result1 = *__first;
++__result1;
}
else
{
*__result2 = *__first;
++__result2;
}
std::copy(__buffer, __result2, __result1);
return __result1;
}
else
{
_ForwardIterator __middle = __first;
std::advance(__middle, __len / 2);
_ForwardIterator __begin =
std::__stable_partition_adaptive(__first, __middle, __pred,
__len / 2, __buffer,
__buffer_size);
_ForwardIterator __end =
std::__stable_partition_adaptive(__middle, __last, __pred,
__len - __len / 2,
__buffer, __buffer_size);
std::rotate(__begin, __middle, __end);
std::advance(__begin, std::distance(__middle, __end));
return __begin;
}
}
/**
* @brief Move elements for which a predicate is true to the beginning
* of a sequence, preserving relative ordering.
* @param first A forward iterator.
* @param last A forward iterator.
* @param pred A predicate functor.
* @return An iterator @p middle such that @p pred(i) is true for each
* iterator @p i in the range @p [first,middle) and false for each @p i
* in the range @p [middle,last).
*
* Performs the same function as @p partition() with the additional
* guarantee that the relative ordering of elements in each group is
* preserved, so any two elements @p x and @p y in the range
* @p [first,last) such that @p pred(x)==pred(y) will have the same
* relative ordering after calling @p stable_partition().
*/
template<typename _ForwardIterator, typename _Predicate>
_ForwardIterator
stable_partition(_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);
if (__first == __last)
return __first;
else
{
typedef typename iterator_traits<_ForwardIterator>::value_type
_ValueType;
typedef typename iterator_traits<_ForwardIterator>::difference_type
_DistanceType;
_Temporary_buffer<_ForwardIterator, _ValueType> __buf(__first,
__last);
if (__buf.size() > 0)
return
std::__stable_partition_adaptive(__first, __last, __pred,
_DistanceType(__buf.requested_size()),
__buf.begin(), __buf.size());
else
return
std::__inplace_stable_partition(__first, __last, __pred,
_DistanceType(__buf.requested_size()));
}
}
/**
* @if maint
* This is a helper function...
* @endif
*/
template<typename _RandomAccessIterator, typename _Tp>
_RandomAccessIterator
__unguarded_partition(_RandomAccessIterator __first,
_RandomAccessIterator __last, _Tp __pivot)
{
while (true)
{
while (*__first < __pivot)
++__first;
--__last;
while (__pivot < *__last)
--__last;
if (!(__first < __last))
return __first;
std::iter_swap(__first, __last);
++__first;
}
}
/**
* @if maint
* This is a helper function...
* @endif
*/
template<typename _RandomAccessIterator, typename _Tp, typename _Compare>
_RandomAccessIterator
__unguarded_partition(_RandomAccessIterator __first,
_RandomAccessIterator __last,
_Tp __pivot, _Compare __comp)
{
while (true)
{
while (__comp(*__first, __pivot))
++__first;
--__last;
while (__comp(__pivot, *__last))
--__last;
if (!(__first < __last))
return __first;
std::iter_swap(__first, __last);
++__first;
}
}
/**
* @if maint
* @doctodo
* This controls some aspect of the sort routines.
* @endif
*/
enum { _S_threshold = 16 };
/**
* @if maint
* This is a helper function for the sort routine.
* @endif
*/
template<typename _RandomAccessIterator, typename _Tp>
void
__unguarded_linear_insert(_RandomAccessIterator __last, _Tp __val)
{
_RandomAccessIterator __next = __last;
--__next;
while (__val < *__next)
{
*__last = *__next;
__last = __next;
--__next;
}
*__last = __val;
}
/**
* @if maint
* This is a helper function for the sort routine.
* @endif
*/
template<typename _RandomAccessIterator, typename _Tp, typename _Compare>
void
__unguarded_linear_insert(_RandomAccessIterator __last, _Tp __val,
_Compare __comp)
{
_RandomAccessIterator __next = __last;
--__next;
while (__comp(__val, *__next))
{
*__last = *__next;
__last = __next;
--__next;
}
*__last = __val;
}
/**
* @if maint
* This is a helper function for the sort routine.
* @endif
*/
template<typename _RandomAccessIterator>
void
__insertion_sort(_RandomAccessIterator __first,
_RandomAccessIterator __last)
{
if (__first == __last)
return;
for (_RandomAccessIterator __i = __first + 1; __i != __last; ++__i)
{
typename iterator_traits<_RandomAccessIterator>::value_type
__val = *__i;
if (__val < *__first)
{
std::copy_backward(__first, __i, __i + 1);
*__first = __val;
}
else
std::__unguarded_linear_insert(__i, __val);
}
}
/**
* @if maint
* This is a helper function for the sort routine.
* @endif
*/
template<typename _RandomAccessIterator, typename _Compare>
void
__insertion_sort(_RandomAccessIterator __first,
_RandomAccessIterator __last, _Compare __comp)
{
if (__first == __last) return;
for (_RandomAccessIterator __i = __first + 1; __i != __last; ++__i)
{
typename iterator_traits<_RandomAccessIterator>::value_type
__val = *__i;
if (__comp(__val, *__first))
{
std::copy_backward(__first, __i, __i + 1);
*__first = __val;
}
else
std::__unguarded_linear_insert(__i, __val, __comp);
}
}
/**
* @if maint
* This is a helper function for the sort routine.
* @endif
*/
template<typename _RandomAccessIterator>
inline void
__unguarded_insertion_sort(_RandomAccessIterator __first,
_RandomAccessIterator __last)
{
typedef typename iterator_traits<_RandomAccessIterator>::value_type
_ValueType;
for (_RandomAccessIterator __i = __first; __i != __last; ++__i)
std::__unguarded_linear_insert(__i, _ValueType(*__i));
}
/**
* @if maint
* This is a helper function for the sort routine.
* @endif
*/
template<typename _RandomAccessIterator, typename _Compare>
inline void
__unguarded_insertion_sort(_RandomAccessIterator __first,
_RandomAccessIterator __last, _Compare __comp)
{
typedef typename iterator_traits<_RandomAccessIterator>::value_type
_ValueType;
for (_RandomAccessIterator __i = __first; __i != __last; ++__i)
std::__unguarded_linear_insert(__i, _ValueType(*__i), __comp);
}
/**
* @if maint
* This is a helper function for the sort routine.
* @endif
*/
template<typename _RandomAccessIterator>
void
__final_insertion_sort(_RandomAccessIterator __first,
_RandomAccessIterator __last)
{
if (__last - __first > _S_threshold)
{
std::__insertion_sort(__first, __first + _S_threshold);
std::__unguarded_insertion_sort(__first + _S_threshold, __last);
}
else
std::__insertion_sort(__first, __last);
}
/**
* @if maint
* This is a helper function for the sort routine.
* @endif
*/
template<typename _RandomAccessIterator, typename _Compare>
void
__final_insertion_sort(_RandomAccessIterator __first,
_RandomAccessIterator __last, _Compare __comp)
{
if (__last - __first > _S_threshold)
{
std::__insertion_sort(__first, __first + _S_threshold, __comp);
std::__unguarded_insertion_sort(__first + _S_threshold, __last,
__comp);
}
else
std::__insertion_sort(__first, __last, __comp);
}
/**
* @if maint
* This is a helper function for the sort routine.
* @endif
*/
template<typename _Size>
inline _Size
__lg(_Size __n)
{
_Size __k;
for (__k = 0; __n != 1; __n >>= 1)
++__k;
return __k;
}
/**
* @brief Sort the smallest elements of a sequence.
* @param first An iterator.
* @param middle Another iterator.
* @param last Another iterator.
* @return Nothing.
*
* Sorts the smallest @p (middle-first) elements in the range
* @p [first,last) and moves them to the range @p [first,middle). The
* order of the remaining elements in the range @p [middle,last) is
* undefined.
* After the sort if @p i and @j are iterators in the range
* @p [first,middle) such that @i precedes @j and @k is an iterator in
* the range @p [middle,last) then @p *j<*i and @p *k<*i are both false.
*/
template<typename _RandomAccessIterator>
void
partial_sort(_RandomAccessIterator __first,
_RandomAccessIterator __middle,
_RandomAccessIterator __last)
{
typedef typename iterator_traits<_RandomAccessIterator>::value_type
_ValueType;
// concept requirements
__glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<
_RandomAccessIterator>)
__glibcxx_function_requires(_LessThanComparableConcept<_ValueType>)
__glibcxx_requires_valid_range(__first, __middle);
__glibcxx_requires_valid_range(__middle, __last);
std::make_heap(__first, __middle);
for (_RandomAccessIterator __i = __middle; __i < __last; ++__i)
if (*__i < *__first)
std::__pop_heap(__first, __middle, __i, _ValueType(*__i));
std::sort_heap(__first, __middle);
}
/**
* @brief Sort the smallest elements of a sequence using a predicate
* for comparison.
* @param first An iterator.
* @param middle Another iterator.
* @param last Another iterator.
* @param comp A comparison functor.
* @return Nothing.
*
* Sorts the smallest @p (middle-first) elements in the range
* @p [first,last) and moves them to the range @p [first,middle). The
* order of the remaining elements in the range @p [middle,last) is
* undefined.
* After the sort if @p i and @j are iterators in the range
* @p [first,middle) such that @i precedes @j and @k is an iterator in
* the range @p [middle,last) then @p *comp(j,*i) and @p comp(*k,*i)
* are both false.
*/
template<typename _RandomAccessIterator, typename _Compare>
void
partial_sort(_RandomAccessIterator __first,
_RandomAccessIterator __middle,
_RandomAccessIterator __last,
_Compare __comp)
{
typedef typename iterator_traits<_RandomAccessIterator>::value_type
_ValueType;
// concept requirements
__glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<
_RandomAccessIterator>)
__glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
_ValueType, _ValueType>)
__glibcxx_requires_valid_range(__first, __middle);
__glibcxx_requires_valid_range(__middle, __last);
std::make_heap(__first, __middle, __comp);
for (_RandomAccessIterator __i = __middle; __i < __last; ++__i)
if (__comp(*__i, *__first))
std::__pop_heap(__first, __middle, __i, _ValueType(*__i), __comp);
std::sort_heap(__first, __middle, __comp);
}
/**
* @brief Copy the smallest elements of a sequence.
* @param first An iterator.
* @param last Another iterator.
* @param result_first A random-access iterator.
* @param result_last Another random-access iterator.
* @return An iterator indicating the end of the resulting sequence.
*
* Copies and sorts the smallest N values from the range @p [first,last)
* to the range beginning at @p result_first, where the number of
* elements to be copied, @p N, is the smaller of @p (last-first) and
* @p (result_last-result_first).
* After the sort if @p i and @j are iterators in the range
* @p [result_first,result_first+N) such that @i precedes @j then
* @p *j<*i is false.
* The value returned is @p result_first+N.
*/
template<typename _InputIterator, typename _RandomAccessIterator>
_RandomAccessIterator
partial_sort_copy(_InputIterator __first, _InputIterator __last,
_RandomAccessIterator __result_first,
_RandomAccessIterator __result_last)
{
typedef typename iterator_traits<_InputIterator>::value_type
_InputValueType;
typedef typename iterator_traits<_RandomAccessIterator>::value_type
_OutputValueType;
typedef typename iterator_traits<_RandomAccessIterator>::difference_type
_DistanceType;
// concept requirements
__glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
__glibcxx_function_requires(_ConvertibleConcept<_InputValueType,
_OutputValueType>)
__glibcxx_function_requires(_LessThanComparableConcept<_OutputValueType>)
__glibcxx_function_requires(_LessThanComparableConcept<_InputValueType>)
__glibcxx_requires_valid_range(__first, __last);
__glibcxx_requires_valid_range(__result_first, __result_last);
if (__result_first == __result_last)
return __result_last;
_RandomAccessIterator __result_real_last = __result_first;
while(__first != __last && __result_real_last != __result_last)
{
*__result_real_last = *__first;
++__result_real_last;
++__first;
}
std::make_heap(__result_first, __result_real_last);
while (__first != __last)
{
if (*__first < *__result_first)
std::__adjust_heap(__result_first, _DistanceType(0),
_DistanceType(__result_real_last
- __result_first),
_InputValueType(*__first));
++__first;
}
std::sort_heap(__result_first, __result_real_last);
return __result_real_last;
}
/**
* @brief Copy the smallest elements of a sequence using a predicate for
* comparison.
* @param first An input iterator.
* @param last Another input iterator.
* @param result_first A random-access iterator.
* @param result_last Another random-access iterator.
* @param comp A comparison functor.
* @return An iterator indicating the end of the resulting sequence.
*
* Copies and sorts the smallest N values from the range @p [first,last)
* to the range beginning at @p result_first, where the number of
* elements to be copied, @p N, is the smaller of @p (last-first) and
* @p (result_last-result_first).
* After the sort if @p i and @j are iterators in the range
* @p [result_first,result_first+N) such that @i precedes @j then
* @p comp(*j,*i) is false.
* The value returned is @p result_first+N.
*/
template<typename _InputIterator, typename _RandomAccessIterator, typename _Compare>
_RandomAccessIterator
partial_sort_copy(_InputIterator __first, _InputIterator __last,
_RandomAccessIterator __result_first,
_RandomAccessIterator __result_last,
_Compare __comp)
{
typedef typename iterator_traits<_InputIterator>::value_type
_InputValueType;
typedef typename iterator_traits<_RandomAccessIterator>::value_type
_OutputValueType;
typedef typename iterator_traits<_RandomAccessIterator>::difference_type
_DistanceType;
// concept requirements
__glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
__glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<
_RandomAccessIterator>)
__glibcxx_function_requires(_ConvertibleConcept<_InputValueType,
_OutputValueType>)
__glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
_OutputValueType, _OutputValueType>)
__glibcxx_requires_valid_range(__first, __last);
__glibcxx_requires_valid_range(__result_first, __result_last);
if (__result_first == __result_last)
return __result_last;
_RandomAccessIterator __result_real_last = __result_first;
while(__first != __last && __result_real_last != __result_last)
{
*__result_real_last = *__first;
++__result_real_last;
++__first;
}
std::make_heap(__result_first, __result_real_last, __comp);
while (__first != __last)
{
if (__comp(*__first, *__result_first))
std::__adjust_heap(__result_first, _DistanceType(0),
_DistanceType(__result_real_last
- __result_first),
_InputValueType(*__first),
__comp);
++__first;
}
std::sort_heap(__result_first, __result_real_last, __comp);
return __result_real_last;
}
/**
* @if maint
* This is a helper function for the sort routine.
* @endif
*/
template<typename _RandomAccessIterator, typename _Size>
void
__introsort_loop(_RandomAccessIterator __first,
_RandomAccessIterator __last,
_Size __depth_limit)
{
typedef typename iterator_traits<_RandomAccessIterator>::value_type
_ValueType;
while (__last - __first > _S_threshold)
{
if (__depth_limit == 0)
{
std::partial_sort(__first, __last, __last);
return;
}
--__depth_limit;
_RandomAccessIterator __cut =
std::__unguarded_partition(__first, __last,
_ValueType(std::__median(*__first,
*(__first
+ (__last
- __first)
/ 2),
*(__last
- 1))));
std::__introsort_loop(__cut, __last, __depth_limit);
__last = __cut;
}
}
/**
* @if maint
* This is a helper function for the sort routine.
* @endif
*/
template<typename _RandomAccessIterator, typename _Size, typename _Compare>
void
__introsort_loop(_RandomAccessIterator __first,
_RandomAccessIterator __last,
_Size __depth_limit, _Compare __comp)
{
typedef typename iterator_traits<_RandomAccessIterator>::value_type
_ValueType;
while (__last - __first > _S_threshold)
{
if (__depth_limit == 0)
{
std::partial_sort(__first, __last, __last, __comp);
return;
}
--__depth_limit;
_RandomAccessIterator __cut =
std::__unguarded_partition(__first, __last,
_ValueType(std::__median(*__first,
*(__first
+ (__last
- __first)
/ 2),
*(__last - 1),
__comp)),
__comp);
std::__introsort_loop(__cut, __last, __depth_limit, __comp);
__last = __cut;
}
}
/**
* @brief Sort the elements of a sequence.
* @param first An iterator.
* @param last Another iterator.
* @return Nothing.
*
* Sorts the elements in the range @p [first,last) in ascending order,
* such that @p *(i+1)<*i is false for each iterator @p i in the range
* @p [first,last-1).
*
* The relative ordering of equivalent elements is not preserved, use
* @p stable_sort() if this is needed.
*/
template<typename _RandomAccessIterator>
inline void
sort(_RandomAccessIterator __first, _RandomAccessIterator __last)
{
typedef typename iterator_traits<_RandomAccessIterator>::value_type
_ValueType;
// concept requirements
__glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<
_RandomAccessIterator>)
__glibcxx_function_requires(_LessThanComparableConcept<_ValueType>)
__glibcxx_requires_valid_range(__first, __last);
if (__first != __last)
{
std::__introsort_loop(__first, __last, __lg(__last - __first) * 2);
std::__final_insertion_sort(__first, __last);
}
}
/**
* @brief Sort the elements of a sequence using a predicate for comparison.
* @param first An iterator.
* @param last Another iterator.
* @param comp A comparison functor.
* @return Nothing.
*
* Sorts the elements in the range @p [first,last) in ascending order,
* such that @p comp(*(i+1),*i) is false for every iterator @p i in the
* range @p [first,last-1).
*
* The relative ordering of equivalent elements is not preserved, use
* @p stable_sort() if this is needed.
*/
template<typename _RandomAccessIterator, typename _Compare>
inline void
sort(_RandomAccessIterator __first, _RandomAccessIterator __last,
_Compare __comp)
{
typedef typename iterator_traits<_RandomAccessIterator>::value_type
_ValueType;
// concept requirements
__glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<
_RandomAccessIterator>)
__glibcxx_function_requires(_BinaryPredicateConcept<_Compare, _ValueType,
_ValueType>)
__glibcxx_requires_valid_range(__first, __last);
if (__first != __last)
{
std::__introsort_loop(__first, __last, __lg(__last - __first) * 2,
__comp);
std::__final_insertion_sort(__first, __last, __comp);
}
}
/**
* @brief Finds the first position in which @a val could be inserted
* without changing the ordering.
* @param first An iterator.
* @param last Another iterator.
* @param val The search term.
* @return An iterator pointing to the first element "not less than" @a val,
* or end() if every element is less than @a val.
* @ingroup binarysearch
*/
template<typename _ForwardIterator, typename _Tp>
_ForwardIterator
lower_bound(_ForwardIterator __first, _ForwardIterator __last,
const _Tp& __val)
{
typedef typename iterator_traits<_ForwardIterator>::value_type
_ValueType;
typedef typename iterator_traits<_ForwardIterator>::difference_type
_DistanceType;
// concept requirements
// Note that these are slightly stricter than those of the 4-argument
// version, defined next. The difference is in the strictness of the
// comparison operations... so for looser checking, define your own
// comparison function, as was intended.
__glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
__glibcxx_function_requires(_SameTypeConcept<_Tp, _ValueType>)
__glibcxx_function_requires(_LessThanComparableConcept<_Tp>)
__glibcxx_requires_partitioned(__first, __last, __val);
_DistanceType __len = std::distance(__first, __last);
_DistanceType __half;
_ForwardIterator __middle;
while (__len > 0)
{
__half = __len >> 1;
__middle = __first;
std::advance(__middle, __half);
if (*__middle < __val)
{
__first = __middle;
++__first;
__len = __len - __half - 1;
}
else
__len = __half;
}
return __first;
}
/**
* @brief Finds the first position in which @a val could be inserted
* without changing the ordering.
* @param first An iterator.
* @param last Another iterator.
* @param val The search term.
* @param comp A functor to use for comparisons.
* @return An iterator pointing to the first element "not less than" @a val,
* or end() if every element is less than @a val.
* @ingroup binarysearch
*
* The comparison function should have the same effects on ordering as
* the function used for the initial sort.
*/
template<typename _ForwardIterator, typename _Tp, typename _Compare>
_ForwardIterator
lower_bound(_ForwardIterator __first, _ForwardIterator __last,
const _Tp& __val, _Compare __comp)
{
typedef typename iterator_traits<_ForwardIterator>::value_type
_ValueType;
typedef typename iterator_traits<_ForwardIterator>::difference_type
_DistanceType;
// concept requirements
__glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
__glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
_ValueType, _Tp>)
__glibcxx_requires_partitioned_pred(__first, __last, __val, __comp);
_DistanceType __len = std::distance(__first, __last);
_DistanceType __half;
_ForwardIterator __middle;
while (__len > 0)
{
__half = __len >> 1;
__middle = __first;
std::advance(__middle, __half);
if (__comp(*__middle, __val))
{
__first = __middle;
++__first;
__len = __len - __half - 1;
}
else
__len = __half;
}
return __first;
}
/**
* @brief Finds the last position in which @a val could be inserted
* without changing the ordering.
* @param first An iterator.
* @param last Another iterator.
* @param val The search term.
* @return An iterator pointing to the first element greater than @a val,
* or end() if no elements are greater than @a val.
* @ingroup binarysearch
*/
template<typename _ForwardIterator, typename _Tp>
_ForwardIterator
upper_bound(_ForwardIterator __first, _ForwardIterator __last,
const _Tp& __val)
{
typedef typename iterator_traits<_ForwardIterator>::value_type
_ValueType;
typedef typename iterator_traits<_ForwardIterator>::difference_type
_DistanceType;
// concept requirements
// See comments on lower_bound.
__glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
__glibcxx_function_requires(_SameTypeConcept<_Tp, _ValueType>)
__glibcxx_function_requires(_LessThanComparableConcept<_Tp>)
__glibcxx_requires_partitioned(__first, __last, __val);
_DistanceType __len = std::distance(__first, __last);
_DistanceType __half;
_ForwardIterator __middle;
while (__len > 0)
{
__half = __len >> 1;
__middle = __first;
std::advance(__middle, __half);
if (__val < *__middle)
__len = __half;
else
{
__first = __middle;
++__first;
__len = __len - __half - 1;
}
}
return __first;
}
/**
* @brief Finds the last position in which @a val could be inserted
* without changing the ordering.
* @param first An iterator.
* @param last Another iterator.
* @param val The search term.
* @param comp A functor to use for comparisons.
* @return An iterator pointing to the first element greater than @a val,
* or end() if no elements are greater than @a val.
* @ingroup binarysearch
*
* The comparison function should have the same effects on ordering as
* the function used for the initial sort.
*/
template<typename _ForwardIterator, typename _Tp, typename _Compare>
_ForwardIterator
upper_bound(_ForwardIterator __first, _ForwardIterator __last,
const _Tp& __val, _Compare __comp)
{
typedef typename iterator_traits<_ForwardIterator>::value_type
_ValueType;
typedef typename iterator_traits<_ForwardIterator>::difference_type
_DistanceType;
// concept requirements
__glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
__glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
_Tp, _ValueType>)
__glibcxx_requires_partitioned_pred(__first, __last, __val, __comp);
_DistanceType __len = std::distance(__first, __last);
_DistanceType __half;
_ForwardIterator __middle;
while (__len > 0)
{
__half = __len >> 1;
__middle = __first;
std::advance(__middle, __half);
if (__comp(__val, *__middle))
__len = __half;
else
{
__first = __middle;
++__first;
__len = __len - __half - 1;
}
}
return __first;
}
/**
* @if maint
* This is a helper function for the merge routines.
* @endif
*/
template<typename _BidirectionalIterator, typename _Distance>
void
__merge_without_buffer(_BidirectionalIterator __first,
_BidirectionalIterator __middle,
_BidirectionalIterator __last,
_Distance __len1, _Distance __len2)
{
if (__len1 == 0 || __len2 == 0)
return;
if (__len1 + __len2 == 2)
{
if (*__middle < *__first)
std::iter_swap(__first, __middle);
return;
}
_BidirectionalIterator __first_cut = __first;
_BidirectionalIterator __second_cut = __middle;
_Distance __len11 = 0;
_Distance __len22 = 0;
if (__len1 > __len2)
{
__len11 = __len1 / 2;
std::advance(__first_cut, __len11);
__second_cut = std::lower_bound(__middle, __last, *__first_cut);
__len22 = std::distance(__middle, __second_cut);
}
else
{
__len22 = __len2 / 2;
std::advance(__second_cut, __len22);
__first_cut = std::upper_bound(__first, __middle, *__second_cut);
__len11 = std::distance(__first, __first_cut);
}
std::rotate(__first_cut, __middle, __second_cut);
_BidirectionalIterator __new_middle = __first_cut;
std::advance(__new_middle, std::distance(__middle, __second_cut));
std::__merge_without_buffer(__first, __first_cut, __new_middle,
__len11, __len22);
std::__merge_without_buffer(__new_middle, __second_cut, __last,
__len1 - __len11, __len2 - __len22);
}
/**
* @if maint
* This is a helper function for the merge routines.
* @endif
*/
template<typename _BidirectionalIterator, typename _Distance,
typename _Compare>
void
__merge_without_buffer(_BidirectionalIterator __first,
_BidirectionalIterator __middle,
_BidirectionalIterator __last,
_Distance __len1, _Distance __len2,
_Compare __comp)
{
if (__len1 == 0 || __len2 == 0)
return;
if (__len1 + __len2 == 2)
{
if (__comp(*__middle, *__first))
std::iter_swap(__first, __middle);
return;
}
_BidirectionalIterator __first_cut = __first;
_BidirectionalIterator __second_cut = __middle;
_Distance __len11 = 0;
_Distance __len22 = 0;
if (__len1 > __len2)
{
__len11 = __len1 / 2;
std::advance(__first_cut, __len11);
__second_cut = std::lower_bound(__middle, __last, *__first_cut,
__comp);
__len22 = std::distance(__middle, __second_cut);
}
else
{
__len22 = __len2 / 2;
std::advance(__second_cut, __len22);
__first_cut = std::upper_bound(__first, __middle, *__second_cut,
__comp);
__len11 = std::distance(__first, __first_cut);
}
std::rotate(__first_cut, __middle, __second_cut);
_BidirectionalIterator __new_middle = __first_cut;
std::advance(__new_middle, std::distance(__middle, __second_cut));
std::__merge_without_buffer(__first, __first_cut, __new_middle,
__len11, __len22, __comp);
std::__merge_without_buffer(__new_middle, __second_cut, __last,
__len1 - __len11, __len2 - __len22, __comp);
}
/**
* @if maint
* This is a helper function for the stable sorting routines.
* @endif
*/
template<typename _RandomAccessIterator>
void
__inplace_stable_sort(_RandomAccessIterator __first,
_RandomAccessIterator __last)
{
if (__last - __first < 15)
{
std::__insertion_sort(__first, __last);
return;
}
_RandomAccessIterator __middle = __first + (__last - __first) / 2;
std::__inplace_stable_sort(__first, __middle);
std::__inplace_stable_sort(__middle, __last);
std::__merge_without_buffer(__first, __middle, __last,
__middle - __first,
__last - __middle);
}
/**
* @if maint
* This is a helper function for the stable sorting routines.
* @endif
*/
template<typename _RandomAccessIterator, typename _Compare>
void
__inplace_stable_sort(_RandomAccessIterator __first,
_RandomAccessIterator __last, _Compare __comp)
{
if (__last - __first < 15)
{
std::__insertion_sort(__first, __last, __comp);
return;
}
_RandomAccessIterator __middle = __first + (__last - __first) / 2;
std::__inplace_stable_sort(__first, __middle, __comp);
std::__inplace_stable_sort(__middle, __last, __comp);
std::__merge_without_buffer(__first, __middle, __last,
__middle - __first,
__last - __middle,
__comp);
}
/**
* @brief Merges two sorted ranges.
* @param first1 An iterator.
* @param first2 Another iterator.
* @param last1 Another iterator.
* @param last2 Another iterator.
* @param result An iterator pointing to the end of the merged range.
* @return An iterator pointing to the first element "not less than" @a val.
*
* Merges the ranges [first1,last1) and [first2,last2) into the sorted range
* [result, result + (last1-first1) + (last2-first2)). Both input ranges
* must be sorted, and the output range must not overlap with either of
* the input ranges. The sort is @e stable, that is, for equivalent
* elements in the two ranges, elements from the first range will always
* come before elements from the second.
*/
template<typename _InputIterator1, typename _InputIterator2,
typename _OutputIterator>
_OutputIterator
merge(_InputIterator1 __first1, _InputIterator1 __last1,
_InputIterator2 __first2, _InputIterator2 __last2,
_OutputIterator __result)
{
// concept requirements
__glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
__glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
__glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
typename iterator_traits<_InputIterator1>::value_type>)
__glibcxx_function_requires(_SameTypeConcept<
typename iterator_traits<_InputIterator1>::value_type,
typename iterator_traits<_InputIterator2>::value_type>)
__glibcxx_function_requires(_LessThanComparableConcept<
typename iterator_traits<_InputIterator1>::value_type>)
__glibcxx_requires_sorted(__first1, __last1);
__glibcxx_requires_sorted(__first2, __last2);
while (__first1 != __last1 && __first2 != __last2)
{
if (*__first2 < *__first1)
{
*__result = *__first2;
++__first2;
}
else
{
*__result = *__first1;
++__first1;
}
++__result;
}
return std::copy(__first2, __last2, std::copy(__first1, __last1,
__result));
}
/**
* @brief Merges two sorted ranges.
* @param first1 An iterator.
* @param first2 Another iterator.
* @param last1 Another iterator.
* @param last2 Another iterator.
* @param result An iterator pointing to the end of the merged range.
* @param comp A functor to use for comparisons.
* @return An iterator pointing to the first element "not less than" @a val.
*
* Merges the ranges [first1,last1) and [first2,last2) into the sorted range
* [result, result + (last1-first1) + (last2-first2)). Both input ranges
* must be sorted, and the output range must not overlap with either of
* the input ranges. The sort is @e stable, that is, for equivalent
* elements in the two ranges, elements from the first range will always
* come before elements from the second.
*
* The comparison function should have the same effects on ordering as
* the function used for the initial sort.
*/
template<typename _InputIterator1, typename _InputIterator2,
typename _OutputIterator, typename _Compare>
_OutputIterator
merge(_InputIterator1 __first1, _InputIterator1 __last1,
_InputIterator2 __first2, _InputIterator2 __last2,
_OutputIterator __result, _Compare __comp)
{
// concept requirements
__glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
__glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
__glibcxx_function_requires(_SameTypeConcept<
typename iterator_traits<_InputIterator1>::value_type,
typename iterator_traits<_InputIterator2>::value_type>)
__glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
typename iterator_traits<_InputIterator1>::value_type>)
__glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
typename iterator_traits<_InputIterator1>::value_type,
typename iterator_traits<_InputIterator2>::value_type>)
__glibcxx_requires_sorted_pred(__first1, __last1, __comp);
__glibcxx_requires_sorted_pred(__first2, __last2, __comp);
while (__first1 != __last1 && __first2 != __last2)
{
if (__comp(*__first2, *__first1))
{
*__result = *__first2;
++__first2;
}
else
{
*__result = *__first1;
++__first1;
}
++__result;
}
return std::copy(__first2, __last2, std::copy(__first1, __last1,
__result));
}
template<typename _RandomAccessIterator1, typename _RandomAccessIterator2,
typename _Distance>
void
__merge_sort_loop(_RandomAccessIterator1 __first,
_RandomAccessIterator1 __last,
_RandomAccessIterator2 __result,
_Distance __step_size)
{
const _Distance __two_step = 2 * __step_size;
while (__last - __first >= __two_step)
{
__result = std::merge(__first, __first + __step_size,
__first + __step_size, __first + __two_step,
__result);
__first += __two_step;
}
__step_size = std::min(_Distance(__last - __first), __step_size);
std::merge(__first, __first + __step_size, __first + __step_size, __last,
__result);
}
template<typename _RandomAccessIterator1, typename _RandomAccessIterator2,
typename _Distance, typename _Compare>
void
__merge_sort_loop(_RandomAccessIterator1 __first,
_RandomAccessIterator1 __last,
_RandomAccessIterator2 __result, _Distance __step_size,
_Compare __comp)
{
const _Distance __two_step = 2 * __step_size;
while (__last - __first >= __two_step)
{
__result = std::merge(__first, __first + __step_size,
__first + __step_size, __first + __two_step,
__result,
__comp);
__first += __two_step;
}
__step_size = std::min(_Distance(__last - __first), __step_size);
std::merge(__first, __first + __step_size,
__first + __step_size, __last,
__result,
__comp);
}
enum { _S_chunk_size = 7 };
template<typename _RandomAccessIterator, typename _Distance>
void
__chunk_insertion_sort(_RandomAccessIterator __first,
_RandomAccessIterator __last,
_Distance __chunk_size)
{
while (__last - __first >= __chunk_size)
{
std::__insertion_sort(__first, __first + __chunk_size);
__first += __chunk_size;
}
std::__insertion_sort(__first, __last);
}
template<typename _RandomAccessIterator, typename _Distance, typename _Compare>
void
__chunk_insertion_sort(_RandomAccessIterator __first,
_RandomAccessIterator __last,
_Distance __chunk_size, _Compare __comp)
{
while (__last - __first >= __chunk_size)
{
std::__insertion_sort(__first, __first + __chunk_size, __comp);
__first += __chunk_size;
}
std::__insertion_sort(__first, __last, __comp);
}
template<typename _RandomAccessIterator, typename _Pointer>
void
__merge_sort_with_buffer(_RandomAccessIterator __first,
_RandomAccessIterator __last,
_Pointer __buffer)
{
typedef typename iterator_traits<_RandomAccessIterator>::difference_type
_Distance;
const _Distance __len = __last - __first;
const _Pointer __buffer_last = __buffer + __len;
_Distance __step_size = _S_chunk_size;
std::__chunk_insertion_sort(__first, __last, __step_size);
while (__step_size < __len)
{
std::__merge_sort_loop(__first, __last, __buffer, __step_size);
__step_size *= 2;
std::__merge_sort_loop(__buffer, __buffer_last, __first, __step_size);
__step_size *= 2;
}
}
template<typename _RandomAccessIterator, typename _Pointer, typename _Compare>
void
__merge_sort_with_buffer(_RandomAccessIterator __first,
_RandomAccessIterator __last,
_Pointer __buffer, _Compare __comp)
{
typedef typename iterator_traits<_RandomAccessIterator>::difference_type
_Distance;
const _Distance __len = __last - __first;
const _Pointer __buffer_last = __buffer + __len;
_Distance __step_size = _S_chunk_size;
std::__chunk_insertion_sort(__first, __last, __step_size, __comp);
while (__step_size < __len)
{
std::__merge_sort_loop(__first, __last, __buffer,
__step_size, __comp);
__step_size *= 2;
std::__merge_sort_loop(__buffer, __buffer_last, __first,
__step_size, __comp);
__step_size *= 2;
}
}
/**
* @if maint
* This is a helper function for the merge routines.
* @endif
*/
template<typename _BidirectionalIterator1, typename _BidirectionalIterator2,
typename _BidirectionalIterator3>
_BidirectionalIterator3
__merge_backward(_BidirectionalIterator1 __first1,
_BidirectionalIterator1 __last1,
_BidirectionalIterator2 __first2,
_BidirectionalIterator2 __last2,
_BidirectionalIterator3 __result)
{
if (__first1 == __last1)
return std::copy_backward(__first2, __last2, __result);
if (__first2 == __last2)
return std::copy_backward(__first1, __last1, __result);
--__last1;
--__last2;
while (true)
{
if (*__last2 < *__last1)
{
*--__result = *__last1;
if (__first1 == __last1)
return std::copy_backward(__first2, ++__last2, __result);
--__last1;
}
else
{
*--__result = *__last2;
if (__first2 == __last2)
return std::copy_backward(__first1, ++__last1, __result);
--__last2;
}
}
}
/**
* @if maint
* This is a helper function for the merge routines.
* @endif
*/
template<typename _BidirectionalIterator1, typename _BidirectionalIterator2,
typename _BidirectionalIterator3, typename _Compare>
_BidirectionalIterator3
__merge_backward(_BidirectionalIterator1 __first1,
_BidirectionalIterator1 __last1,
_BidirectionalIterator2 __first2,
_BidirectionalIterator2 __last2,
_BidirectionalIterator3 __result,
_Compare __comp)
{
if (__first1 == __last1)
return std::copy_backward(__first2, __last2,<