119dbb1fce
2003-07-15 Jerry Quinn <jlquinn@optonline.net>
* include/bits/stl_algo.h (includes, set_union, set_intersection,
set_difference, set_symmetric_difference, max_element, min_element,
next_permutation, prev_permutation, find_first_of, find_end):
Document.
* include/bits/stl_algobase.h (copy,copy_backward): Clarify overlap
restrictions in docs.
* include/bits/stl_heap.h (push_heap, pop_heap, make_heap, sort_heap):
Document.
* docs/doxygen/doxygroups.cc (setoperations): New group.
From-SVN: r69387
796 lines
28 KiB
C++
796 lines
28 KiB
C++
// Bits and pieces used in algorithms -*- C++ -*-
|
|
|
|
// Copyright (C) 2001, 2002, 2003 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) 1996-1998
|
|
* 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_algobase.h
|
|
* This is an internal header file, included by other library headers.
|
|
* You should not attempt to use it directly.
|
|
*/
|
|
|
|
#ifndef _ALGOBASE_H
|
|
#define _ALGOBASE_H 1
|
|
|
|
#include <bits/c++config.h>
|
|
#include <cstring>
|
|
#include <climits>
|
|
#include <cstdlib>
|
|
#include <cstddef>
|
|
#include <new>
|
|
#include <iosfwd>
|
|
#include <bits/stl_pair.h>
|
|
#include <bits/type_traits.h>
|
|
#include <bits/stl_iterator_base_types.h>
|
|
#include <bits/stl_iterator_base_funcs.h>
|
|
#include <bits/stl_iterator.h>
|
|
#include <bits/concept_check.h>
|
|
|
|
namespace std
|
|
{
|
|
/**
|
|
* @brief Swaps the contents of two iterators.
|
|
* @param a An iterator.
|
|
* @param b Another iterator.
|
|
* @return Nothing.
|
|
*
|
|
* This function swaps the values pointed to by two iterators, not the
|
|
* iterators themselves.
|
|
*/
|
|
template<typename _ForwardIterator1, typename _ForwardIterator2>
|
|
inline void
|
|
iter_swap(_ForwardIterator1 __a, _ForwardIterator2 __b)
|
|
{
|
|
typedef typename iterator_traits<_ForwardIterator1>::value_type _ValueType1;
|
|
typedef typename iterator_traits<_ForwardIterator2>::value_type _ValueType2;
|
|
|
|
// concept requirements
|
|
__glibcxx_function_requires(_Mutable_ForwardIteratorConcept<_ForwardIterator1>)
|
|
__glibcxx_function_requires(_Mutable_ForwardIteratorConcept<_ForwardIterator2>)
|
|
__glibcxx_function_requires(_ConvertibleConcept<_ValueType1, _ValueType2>)
|
|
__glibcxx_function_requires(_ConvertibleConcept<_ValueType2, _ValueType1>)
|
|
|
|
_ValueType1 __tmp = *__a;
|
|
*__a = *__b;
|
|
*__b = __tmp;
|
|
}
|
|
|
|
/**
|
|
* @brief Swaps two values.
|
|
* @param a A thing of arbitrary type.
|
|
* @param b Another thing of arbitrary type.
|
|
* @return Nothing.
|
|
*
|
|
* This is the simple classic generic implementation. It will work on
|
|
* any type which has a copy constructor and an assignment operator.
|
|
*/
|
|
template<typename _Tp>
|
|
inline void
|
|
swap(_Tp& __a, _Tp& __b)
|
|
{
|
|
// concept requirements
|
|
__glibcxx_function_requires(_SGIAssignableConcept<_Tp>)
|
|
|
|
_Tp __tmp = __a;
|
|
__a = __b;
|
|
__b = __tmp;
|
|
}
|
|
|
|
#undef min
|
|
#undef max
|
|
|
|
/**
|
|
* @brief This does what you think it does.
|
|
* @param a A thing of arbitrary type.
|
|
* @param b Another thing of arbitrary type.
|
|
* @return The lesser of the parameters.
|
|
*
|
|
* This is the simple classic generic implementation. It will work on
|
|
* temporary expressions, since they are only evaluated once, unlike a
|
|
* preprocessor macro.
|
|
*/
|
|
template<typename _Tp>
|
|
inline const _Tp&
|
|
min(const _Tp& __a, const _Tp& __b)
|
|
{
|
|
// concept requirements
|
|
__glibcxx_function_requires(_LessThanComparableConcept<_Tp>)
|
|
//return __b < __a ? __b : __a;
|
|
if (__b < __a) return __b; return __a;
|
|
}
|
|
|
|
/**
|
|
* @brief This does what you think it does.
|
|
* @param a A thing of arbitrary type.
|
|
* @param b Another thing of arbitrary type.
|
|
* @return The greater of the parameters.
|
|
*
|
|
* This is the simple classic generic implementation. It will work on
|
|
* temporary expressions, since they are only evaluated once, unlike a
|
|
* preprocessor macro.
|
|
*/
|
|
template<typename _Tp>
|
|
inline const _Tp&
|
|
max(const _Tp& __a, const _Tp& __b)
|
|
{
|
|
// concept requirements
|
|
__glibcxx_function_requires(_LessThanComparableConcept<_Tp>)
|
|
//return __a < __b ? __b : __a;
|
|
if (__a < __b) return __b; return __a;
|
|
}
|
|
|
|
/**
|
|
* @brief This does what you think it does.
|
|
* @param a A thing of arbitrary type.
|
|
* @param b Another thing of arbitrary type.
|
|
* @param comp A @link s20_3_3_comparisons comparison functor@endlink.
|
|
* @return The lesser of the parameters.
|
|
*
|
|
* This will work on temporary expressions, since they are only evaluated
|
|
* once, unlike a preprocessor macro.
|
|
*/
|
|
template<typename _Tp, typename _Compare>
|
|
inline const _Tp&
|
|
min(const _Tp& __a, const _Tp& __b, _Compare __comp)
|
|
{
|
|
//return __comp(__b, __a) ? __b : __a;
|
|
if (__comp(__b, __a)) return __b; return __a;
|
|
}
|
|
|
|
/**
|
|
* @brief This does what you think it does.
|
|
* @param a A thing of arbitrary type.
|
|
* @param b Another thing of arbitrary type.
|
|
* @param comp A @link s20_3_3_comparisons comparison functor@endlink.
|
|
* @return The greater of the parameters.
|
|
*
|
|
* This will work on temporary expressions, since they are only evaluated
|
|
* once, unlike a preprocessor macro.
|
|
*/
|
|
template<typename _Tp, typename _Compare>
|
|
inline const _Tp&
|
|
max(const _Tp& __a, const _Tp& __b, _Compare __comp)
|
|
{
|
|
//return __comp(__a, __b) ? __b : __a;
|
|
if (__comp(__a, __b)) return __b; return __a;
|
|
}
|
|
|
|
// All of these auxiliary functions serve two purposes. (1) Replace
|
|
// calls to copy with memmove whenever possible. (Memmove, not memcpy,
|
|
// because the input and output ranges are permitted to overlap.)
|
|
// (2) If we're using random access iterators, then write the loop as
|
|
// a for loop with an explicit count.
|
|
|
|
template<typename _InputIterator, typename _OutputIterator>
|
|
inline _OutputIterator
|
|
__copy(_InputIterator __first, _InputIterator __last,
|
|
_OutputIterator __result, input_iterator_tag)
|
|
{
|
|
for (; __first != __last; ++__result, ++__first)
|
|
*__result = *__first;
|
|
return __result;
|
|
}
|
|
|
|
template<typename _RandomAccessIterator, typename _OutputIterator>
|
|
inline _OutputIterator
|
|
__copy(_RandomAccessIterator __first, _RandomAccessIterator __last,
|
|
_OutputIterator __result, random_access_iterator_tag)
|
|
{
|
|
typedef typename iterator_traits<_RandomAccessIterator>::difference_type
|
|
_Distance;
|
|
for (_Distance __n = __last - __first; __n > 0; --__n)
|
|
{
|
|
*__result = *__first;
|
|
++__first;
|
|
++__result;
|
|
}
|
|
return __result;
|
|
}
|
|
|
|
template<typename _Tp>
|
|
inline _Tp*
|
|
__copy_trivial(const _Tp* __first, const _Tp* __last, _Tp* __result)
|
|
{
|
|
std::memmove(__result, __first, sizeof(_Tp) * (__last - __first));
|
|
return __result + (__last - __first);
|
|
}
|
|
|
|
template<typename _InputIterator, typename _OutputIterator>
|
|
inline _OutputIterator
|
|
__copy_aux2(_InputIterator __first, _InputIterator __last,
|
|
_OutputIterator __result, __false_type)
|
|
{ return std::__copy(__first, __last, __result, std::__iterator_category(__first)); }
|
|
|
|
template<typename _InputIterator, typename _OutputIterator>
|
|
inline _OutputIterator
|
|
__copy_aux2(_InputIterator __first, _InputIterator __last,
|
|
_OutputIterator __result, __true_type)
|
|
{ return std::__copy(__first, __last, __result, std::__iterator_category(__first)); }
|
|
|
|
template<typename _Tp>
|
|
inline _Tp*
|
|
__copy_aux2(_Tp* __first, _Tp* __last, _Tp* __result, __true_type)
|
|
{ return std::__copy_trivial(__first, __last, __result); }
|
|
|
|
template<typename _Tp>
|
|
inline _Tp*
|
|
__copy_aux2(const _Tp* __first, const _Tp* __last, _Tp* __result,
|
|
__true_type)
|
|
{ return std::__copy_trivial(__first, __last, __result); }
|
|
|
|
template<typename _InputIterator, typename _OutputIterator>
|
|
inline _OutputIterator
|
|
__copy_ni2(_InputIterator __first, _InputIterator __last,
|
|
_OutputIterator __result, __true_type)
|
|
{
|
|
typedef typename iterator_traits<_InputIterator>::value_type
|
|
_ValueType;
|
|
typedef typename __type_traits<_ValueType>::has_trivial_assignment_operator
|
|
_Trivial;
|
|
return _OutputIterator(std::__copy_aux2(__first, __last, __result.base(),
|
|
_Trivial()));
|
|
}
|
|
|
|
template<typename _InputIterator, typename _OutputIterator>
|
|
inline _OutputIterator
|
|
__copy_ni2(_InputIterator __first, _InputIterator __last,
|
|
_OutputIterator __result, __false_type)
|
|
{
|
|
typedef typename iterator_traits<_InputIterator>::value_type _ValueType;
|
|
typedef typename __type_traits<_ValueType>::has_trivial_assignment_operator
|
|
_Trivial;
|
|
return std::__copy_aux2(__first, __last, __result, _Trivial());
|
|
}
|
|
|
|
template<typename _InputIterator, typename _OutputIterator>
|
|
inline _OutputIterator
|
|
__copy_ni1(_InputIterator __first, _InputIterator __last,
|
|
_OutputIterator __result, __true_type)
|
|
{
|
|
typedef typename _Is_normal_iterator<_OutputIterator>::_Normal __Normal;
|
|
return std::__copy_ni2(__first.base(), __last.base(), __result, __Normal());
|
|
}
|
|
|
|
template<typename _InputIterator, typename _OutputIterator>
|
|
inline _OutputIterator
|
|
__copy_ni1(_InputIterator __first, _InputIterator __last,
|
|
_OutputIterator __result, __false_type)
|
|
{
|
|
typedef typename _Is_normal_iterator<_OutputIterator>::_Normal __Normal;
|
|
return std::__copy_ni2(__first, __last, __result, __Normal());
|
|
}
|
|
|
|
/**
|
|
* @brief Copies the range [first,last) into result.
|
|
* @param first An input iterator.
|
|
* @param last An input iterator.
|
|
* @param result An output iterator.
|
|
* @return result + (first - last)
|
|
*
|
|
* This inline function will boil down to a call to @c memmove whenever
|
|
* possible. Failing that, if random access iterators are passed, then the
|
|
* loop count will be known (and therefore a candidate for compiler
|
|
* optimizations such as unrolling). Result may not be contained within
|
|
* [first,last); the copy_backward function should be used instead.
|
|
*
|
|
* Note that the end of the output range is permitted to be contained
|
|
* within [first,last).
|
|
*/
|
|
template<typename _InputIterator, typename _OutputIterator>
|
|
inline _OutputIterator
|
|
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>)
|
|
|
|
typedef typename _Is_normal_iterator<_InputIterator>::_Normal __Normal;
|
|
return std::__copy_ni1(__first, __last, __result, __Normal());
|
|
}
|
|
|
|
template<typename _BidirectionalIterator1, typename _BidirectionalIterator2>
|
|
inline _BidirectionalIterator2
|
|
__copy_backward(_BidirectionalIterator1 __first, _BidirectionalIterator1 __last,
|
|
_BidirectionalIterator2 __result, bidirectional_iterator_tag)
|
|
{
|
|
while (__first != __last)
|
|
*--__result = *--__last;
|
|
return __result;
|
|
}
|
|
|
|
template<typename _RandomAccessIterator, typename _BidirectionalIterator>
|
|
inline _BidirectionalIterator
|
|
__copy_backward(_RandomAccessIterator __first, _RandomAccessIterator __last,
|
|
_BidirectionalIterator __result, random_access_iterator_tag)
|
|
{
|
|
typename iterator_traits<_RandomAccessIterator>::difference_type __n;
|
|
for (__n = __last - __first; __n > 0; --__n)
|
|
*--__result = *--__last;
|
|
return __result;
|
|
}
|
|
|
|
|
|
// This dispatch class is a workaround for compilers that do not
|
|
// have partial ordering of function templates. All we're doing is
|
|
// creating a specialization so that we can turn a call to copy_backward
|
|
// into a memmove whenever possible.
|
|
template<typename _BidirectionalIterator1, typename _BidirectionalIterator2,
|
|
typename _BoolType>
|
|
struct __copy_backward_dispatch
|
|
{
|
|
static _BidirectionalIterator2
|
|
copy(_BidirectionalIterator1 __first, _BidirectionalIterator1 __last,
|
|
_BidirectionalIterator2 __result)
|
|
{
|
|
return std::__copy_backward(__first, __last, __result,
|
|
std::__iterator_category(__first));
|
|
}
|
|
};
|
|
|
|
template<typename _Tp>
|
|
struct __copy_backward_dispatch<_Tp*, _Tp*, __true_type>
|
|
{
|
|
static _Tp*
|
|
copy(const _Tp* __first, const _Tp* __last, _Tp* __result)
|
|
{
|
|
const ptrdiff_t _Num = __last - __first;
|
|
std::memmove(__result - _Num, __first, sizeof(_Tp) * _Num);
|
|
return __result - _Num;
|
|
}
|
|
};
|
|
|
|
template<typename _Tp>
|
|
struct __copy_backward_dispatch<const _Tp*, _Tp*, __true_type>
|
|
{
|
|
static _Tp*
|
|
copy(const _Tp* __first, const _Tp* __last, _Tp* __result)
|
|
{
|
|
return std::__copy_backward_dispatch<_Tp*, _Tp*, __true_type>
|
|
::copy(__first, __last, __result);
|
|
}
|
|
};
|
|
|
|
template<typename _BI1, typename _BI2>
|
|
inline _BI2
|
|
__copy_backward_aux(_BI1 __first, _BI1 __last, _BI2 __result)
|
|
{
|
|
typedef typename __type_traits<typename iterator_traits<_BI2>::value_type>
|
|
::has_trivial_assignment_operator _Trivial;
|
|
return std::__copy_backward_dispatch<_BI1, _BI2, _Trivial>::copy(__first,
|
|
__last,
|
|
__result);
|
|
}
|
|
|
|
template <typename _BI1, typename _BI2>
|
|
inline _BI2
|
|
__copy_backward_output_normal_iterator(_BI1 __first, _BI1 __last,
|
|
_BI2 __result, __true_type)
|
|
{ return _BI2(std::__copy_backward_aux(__first, __last, __result.base())); }
|
|
|
|
template <typename _BI1, typename _BI2>
|
|
inline _BI2
|
|
__copy_backward_output_normal_iterator(_BI1 __first, _BI1 __last,
|
|
_BI2 __result, __false_type)
|
|
{ return std::__copy_backward_aux(__first, __last, __result); }
|
|
|
|
template <typename _BI1, typename _BI2>
|
|
inline _BI2
|
|
__copy_backward_input_normal_iterator(_BI1 __first, _BI1 __last,
|
|
_BI2 __result, __true_type)
|
|
{
|
|
typedef typename _Is_normal_iterator<_BI2>::_Normal __Normal;
|
|
return std::__copy_backward_output_normal_iterator(__first.base(),
|
|
__last.base(), __result,
|
|
__Normal());
|
|
}
|
|
|
|
template <typename _BI1, typename _BI2>
|
|
inline _BI2
|
|
__copy_backward_input_normal_iterator(_BI1 __first, _BI1 __last,
|
|
_BI2 __result, __false_type)
|
|
{
|
|
typedef typename _Is_normal_iterator<_BI2>::_Normal __Normal;
|
|
return std::__copy_backward_output_normal_iterator(__first, __last, __result,
|
|
__Normal());
|
|
}
|
|
|
|
/**
|
|
* @brief Copies the range [first,last) into result.
|
|
* @param first A bidirectional iterator.
|
|
* @param last A bidirectional iterator.
|
|
* @param result A bidirectional iterator.
|
|
* @return result - (first - last)
|
|
*
|
|
* The function has the same effect as copy, but starts at the end of the
|
|
* range and works its way to the start, returning the start of the result.
|
|
* This inline function will boil down to a call to @c memmove whenever
|
|
* possible. Failing that, if random access iterators are passed, then the
|
|
* loop count will be known (and therefore a candidate for compiler
|
|
* optimizations such as unrolling).
|
|
*
|
|
* Result may not be in the range [first,last). Use copy instead. Note
|
|
* that the start of the output range may overlap [first,last).
|
|
*/
|
|
template <typename _BI1, typename _BI2>
|
|
inline _BI2
|
|
copy_backward(_BI1 __first, _BI1 __last, _BI2 __result)
|
|
{
|
|
// concept requirements
|
|
__glibcxx_function_requires(_BidirectionalIteratorConcept<_BI1>)
|
|
__glibcxx_function_requires(_Mutable_BidirectionalIteratorConcept<_BI2>)
|
|
__glibcxx_function_requires(_ConvertibleConcept<
|
|
typename iterator_traits<_BI1>::value_type,
|
|
typename iterator_traits<_BI2>::value_type>)
|
|
|
|
typedef typename _Is_normal_iterator<_BI1>::_Normal __Normal;
|
|
return std::__copy_backward_input_normal_iterator(__first, __last, __result,
|
|
__Normal());
|
|
}
|
|
|
|
|
|
/**
|
|
* @brief Fills the range [first,last) with copies of value.
|
|
* @param first A forward iterator.
|
|
* @param last A forward iterator.
|
|
* @param value A reference-to-const of arbitrary type.
|
|
* @return Nothing.
|
|
*
|
|
* This function fills a range with copies of the same value. For one-byte
|
|
* types filling contiguous areas of memory, this becomes an inline call to
|
|
* @c memset.
|
|
*/
|
|
template<typename _ForwardIterator, typename _Tp>
|
|
void
|
|
fill(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value)
|
|
{
|
|
// concept requirements
|
|
__glibcxx_function_requires(_Mutable_ForwardIteratorConcept<_ForwardIterator>)
|
|
|
|
for ( ; __first != __last; ++__first)
|
|
*__first = __value;
|
|
}
|
|
|
|
/**
|
|
* @brief Fills the range [first,first+n) with copies of value.
|
|
* @param first An output iterator.
|
|
* @param n The count of copies to perform.
|
|
* @param value A reference-to-const of arbitrary type.
|
|
* @return The iterator at first+n.
|
|
*
|
|
* This function fills a range with copies of the same value. For one-byte
|
|
* types filling contiguous areas of memory, this becomes an inline call to
|
|
* @c memset.
|
|
*/
|
|
template<typename _OutputIterator, typename _Size, typename _Tp>
|
|
_OutputIterator
|
|
fill_n(_OutputIterator __first, _Size __n, const _Tp& __value)
|
|
{
|
|
// concept requirements
|
|
__glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,_Tp>)
|
|
|
|
for ( ; __n > 0; --__n, ++__first)
|
|
*__first = __value;
|
|
return __first;
|
|
}
|
|
|
|
// Specialization: for one-byte types we can use memset.
|
|
inline void
|
|
fill(unsigned char* __first, unsigned char* __last, const unsigned char& __c)
|
|
{
|
|
unsigned char __tmp = __c;
|
|
std::memset(__first, __tmp, __last - __first);
|
|
}
|
|
|
|
inline void
|
|
fill(signed char* __first, signed char* __last, const signed char& __c)
|
|
{
|
|
signed char __tmp = __c;
|
|
std::memset(__first, static_cast<unsigned char>(__tmp), __last - __first);
|
|
}
|
|
|
|
inline void
|
|
fill(char* __first, char* __last, const char& __c)
|
|
{
|
|
char __tmp = __c;
|
|
std::memset(__first, static_cast<unsigned char>(__tmp), __last - __first);
|
|
}
|
|
|
|
template<typename _Size>
|
|
inline unsigned char*
|
|
fill_n(unsigned char* __first, _Size __n, const unsigned char& __c)
|
|
{
|
|
std::fill(__first, __first + __n, __c);
|
|
return __first + __n;
|
|
}
|
|
|
|
template<typename _Size>
|
|
inline signed char*
|
|
fill_n(char* __first, _Size __n, const signed char& __c)
|
|
{
|
|
std::fill(__first, __first + __n, __c);
|
|
return __first + __n;
|
|
}
|
|
|
|
template<typename _Size>
|
|
inline char*
|
|
fill_n(char* __first, _Size __n, const char& __c)
|
|
{
|
|
std::fill(__first, __first + __n, __c);
|
|
return __first + __n;
|
|
}
|
|
|
|
|
|
/**
|
|
* @brief Finds the places in ranges which don't match.
|
|
* @param first1 An input iterator.
|
|
* @param last1 An input iterator.
|
|
* @param first2 An input iterator.
|
|
* @return A pair of iterators pointing to the first mismatch.
|
|
*
|
|
* This compares the elements of two ranges using @c == and returns a pair
|
|
* of iterators. The first iterator points into the first range, the
|
|
* second iterator points into the second range, and the elements pointed
|
|
* to by the iterators are not equal.
|
|
*/
|
|
template<typename _InputIterator1, typename _InputIterator2>
|
|
pair<_InputIterator1, _InputIterator2>
|
|
mismatch(_InputIterator1 __first1, _InputIterator1 __last1,
|
|
_InputIterator2 __first2)
|
|
{
|
|
// concept requirements
|
|
__glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
|
|
__glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
|
|
__glibcxx_function_requires(_EqualityComparableConcept<
|
|
typename iterator_traits<_InputIterator1>::value_type>)
|
|
__glibcxx_function_requires(_EqualityComparableConcept<
|
|
typename iterator_traits<_InputIterator2>::value_type>)
|
|
|
|
while (__first1 != __last1 && *__first1 == *__first2)
|
|
{
|
|
++__first1;
|
|
++__first2;
|
|
}
|
|
return pair<_InputIterator1, _InputIterator2>(__first1, __first2);
|
|
}
|
|
|
|
/**
|
|
* @brief Finds the places in ranges which don't match.
|
|
* @param first1 An input iterator.
|
|
* @param last1 An input iterator.
|
|
* @param first2 An input iterator.
|
|
* @param binary_pred A binary predicate @link s20_3_1_base functor@endlink.
|
|
* @return A pair of iterators pointing to the first mismatch.
|
|
*
|
|
* This compares the elements of two ranges using the binary_pred
|
|
* parameter, and returns a pair
|
|
* of iterators. The first iterator points into the first range, the
|
|
* second iterator points into the second range, and the elements pointed
|
|
* to by the iterators are not equal.
|
|
*/
|
|
template<typename _InputIterator1, typename _InputIterator2, typename _BinaryPredicate>
|
|
pair<_InputIterator1, _InputIterator2>
|
|
mismatch(_InputIterator1 __first1, _InputIterator1 __last1,
|
|
_InputIterator2 __first2, _BinaryPredicate __binary_pred)
|
|
{
|
|
// concept requirements
|
|
__glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
|
|
__glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
|
|
|
|
while (__first1 != __last1 && __binary_pred(*__first1, *__first2))
|
|
{
|
|
++__first1;
|
|
++__first2;
|
|
}
|
|
return pair<_InputIterator1, _InputIterator2>(__first1, __first2);
|
|
}
|
|
|
|
/**
|
|
* @brief Tests a range for element-wise equality.
|
|
* @param first1 An input iterator.
|
|
* @param last1 An input iterator.
|
|
* @param first2 An input iterator.
|
|
* @return A boolean true or false.
|
|
*
|
|
* This compares the elements of two ranges using @c == and returns true or
|
|
* false depending on whether all of the corresponding elements of the
|
|
* ranges are equal.
|
|
*/
|
|
template<typename _InputIterator1, typename _InputIterator2>
|
|
inline bool
|
|
equal(_InputIterator1 __first1, _InputIterator1 __last1, _InputIterator2 __first2)
|
|
{
|
|
// concept requirements
|
|
__glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
|
|
__glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
|
|
__glibcxx_function_requires(_EqualOpConcept<
|
|
typename iterator_traits<_InputIterator1>::value_type,
|
|
typename iterator_traits<_InputIterator2>::value_type>)
|
|
|
|
for ( ; __first1 != __last1; ++__first1, ++__first2)
|
|
if (!(*__first1 == *__first2))
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* @brief Tests a range for element-wise equality.
|
|
* @param first1 An input iterator.
|
|
* @param last1 An input iterator.
|
|
* @param first2 An input iterator.
|
|
* @param binary_pred A binary predicate @link s20_3_1_base functor@endlink.
|
|
* @return A boolean true or false.
|
|
*
|
|
* This compares the elements of two ranges using the binary_pred
|
|
* parameter, and returns true or
|
|
* false depending on whether all of the corresponding elements of the
|
|
* ranges are equal.
|
|
*/
|
|
template<typename _InputIterator1, typename _InputIterator2, typename _BinaryPredicate>
|
|
inline bool
|
|
equal(_InputIterator1 __first1, _InputIterator1 __last1,
|
|
_InputIterator2 __first2,
|
|
_BinaryPredicate __binary_pred)
|
|
{
|
|
// concept requirements
|
|
__glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
|
|
__glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
|
|
|
|
for ( ; __first1 != __last1; ++__first1, ++__first2)
|
|
if (!__binary_pred(*__first1, *__first2))
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* @brief Performs "dictionary" comparison on ranges.
|
|
* @param first1 An input iterator.
|
|
* @param last1 An input iterator.
|
|
* @param first2 An input iterator.
|
|
* @param last2 An input iterator.
|
|
* @return A boolean true or false.
|
|
*
|
|
* "Returns true if the sequence of elements defined by the range
|
|
* [first1,last1) is lexicographically less than the sequence of elements
|
|
* defined by the range [first2,last2). Returns false otherwise."
|
|
* (Quoted from [25.3.8]/1.) If the iterators are all character pointers,
|
|
* then this is an inline call to @c memcmp.
|
|
*/
|
|
template<typename _InputIterator1, typename _InputIterator2>
|
|
bool
|
|
lexicographical_compare(_InputIterator1 __first1, _InputIterator1 __last1,
|
|
_InputIterator2 __first2, _InputIterator2 __last2)
|
|
{
|
|
// concept requirements
|
|
__glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
|
|
__glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
|
|
__glibcxx_function_requires(_LessThanComparableConcept<
|
|
typename iterator_traits<_InputIterator1>::value_type>)
|
|
__glibcxx_function_requires(_LessThanComparableConcept<
|
|
typename iterator_traits<_InputIterator2>::value_type>)
|
|
|
|
for (;__first1 != __last1 && __first2 != __last2; ++__first1, ++__first2)
|
|
{
|
|
if (*__first1 < *__first2)
|
|
return true;
|
|
if (*__first2 < *__first1)
|
|
return false;
|
|
}
|
|
return __first1 == __last1 && __first2 != __last2;
|
|
}
|
|
|
|
/**
|
|
* @brief Performs "dictionary" comparison on ranges.
|
|
* @param first1 An input iterator.
|
|
* @param last1 An input iterator.
|
|
* @param first2 An input iterator.
|
|
* @param last2 An input iterator.
|
|
* @param comp A @link s20_3_3_comparisons comparison functor@endlink.
|
|
* @return A boolean true or false.
|
|
*
|
|
* The same as the four-parameter @c lexigraphical_compare, but uses the
|
|
* comp parameter instead of @c <.
|
|
*/
|
|
template<typename _InputIterator1, typename _InputIterator2, typename _Compare>
|
|
bool
|
|
lexicographical_compare(_InputIterator1 __first1, _InputIterator1 __last1,
|
|
_InputIterator2 __first2, _InputIterator2 __last2,
|
|
_Compare __comp)
|
|
{
|
|
// concept requirements
|
|
__glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
|
|
__glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
|
|
|
|
for ( ; __first1 != __last1 && __first2 != __last2
|
|
; ++__first1, ++__first2)
|
|
{
|
|
if (__comp(*__first1, *__first2))
|
|
return true;
|
|
if (__comp(*__first2, *__first1))
|
|
return false;
|
|
}
|
|
return __first1 == __last1 && __first2 != __last2;
|
|
}
|
|
|
|
inline bool
|
|
lexicographical_compare(const unsigned char* __first1,
|
|
const unsigned char* __last1,
|
|
const unsigned char* __first2,
|
|
const unsigned char* __last2)
|
|
{
|
|
const size_t __len1 = __last1 - __first1;
|
|
const size_t __len2 = __last2 - __first2;
|
|
const int __result = std::memcmp(__first1, __first2, std::min(__len1, __len2));
|
|
return __result != 0 ? __result < 0 : __len1 < __len2;
|
|
}
|
|
|
|
inline bool
|
|
lexicographical_compare(const char* __first1, const char* __last1,
|
|
const char* __first2, const char* __last2)
|
|
{
|
|
#if CHAR_MAX == SCHAR_MAX
|
|
return std::lexicographical_compare((const signed char*) __first1,
|
|
(const signed char*) __last1,
|
|
(const signed char*) __first2,
|
|
(const signed char*) __last2);
|
|
#else /* CHAR_MAX == SCHAR_MAX */
|
|
return std::lexicographical_compare((const unsigned char*) __first1,
|
|
(const unsigned char*) __last1,
|
|
(const unsigned char*) __first2,
|
|
(const unsigned char*) __last2);
|
|
#endif /* CHAR_MAX == SCHAR_MAX */
|
|
}
|
|
|
|
} // namespace std
|
|
|
|
#endif
|