stl_algobase.h

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/*
 *
 * 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.
 */

/* NOTE: This is an internal header file, included by other STL headers.
 *   You should not attempt to use it directly.
 */


#ifndef __SGI_STL_INTERNAL_ALGOBASE_H
#define __SGI_STL_INTERNAL_ALGOBASE_H

#include <bits/c++config.h>
#ifndef __SGI_STL_INTERNAL_PAIR_H
#include <bits/stl_pair.h>
#endif
#ifndef _CPP_BITS_TYPE_TRAITS_H
#include <bits/type_traits.h>
#endif
#include <bits/std_cstring.h>
#include <bits/std_climits.h>
#include <bits/std_cstdlib.h>
#include <bits/std_cstddef.h>
#include <new>

#include <bits/std_iosfwd.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
{

// swap and iter_swap

template <class _ForwardIter1, class _ForwardIter2, class _Tp>
inline void __iter_swap(_ForwardIter1 __a, _ForwardIter2 __b, _Tp*)
{
  _Tp __tmp = *__a;
  *__a = *__b;
  *__b = __tmp;
}

template <class _ForwardIter1, class _ForwardIter2>
inline void iter_swap(_ForwardIter1 __a, _ForwardIter2 __b)
{
  // concept requirements
  __glibcpp_function_requires(_Mutable_ForwardIteratorConcept<_ForwardIter1>);
  __glibcpp_function_requires(_Mutable_ForwardIteratorConcept<_ForwardIter2>);
  __glibcpp_function_requires(_ConvertibleConcept<
        typename iterator_traits<_ForwardIter1>::value_type,
        typename iterator_traits<_ForwardIter2>::value_type>);
  __glibcpp_function_requires(_ConvertibleConcept<
        typename iterator_traits<_ForwardIter2>::value_type,
        typename iterator_traits<_ForwardIter1>::value_type>);

  __iter_swap(__a, __b, __value_type(__a));
}

template <class _Tp>
inline void swap(_Tp& __a, _Tp& __b)
{
  // concept requirements
  __glibcpp_function_requires(_SGIAssignableConcept<_Tp>);

  _Tp __tmp = __a;
  __a = __b;
  __b = __tmp;
}

//--------------------------------------------------
// min and max

#undef min
#undef max

template <class _Tp>
inline const _Tp& min(const _Tp& __a, const _Tp& __b) {
  // concept requirements
  __glibcpp_function_requires(_LessThanComparableConcept<_Tp>);
  //return __b < __a ? __b : __a;
  if (__b < __a) return __b; return __a;
}

template <class _Tp>
inline const _Tp& max(const _Tp& __a, const _Tp& __b) {
  // concept requirements
  __glibcpp_function_requires(_LessThanComparableConcept<_Tp>);
  //return  __a < __b ? __b : __a;
  if (__a < __b) return __b; return __a;
}

template <class _Tp, class _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;
}

template <class _Tp, class _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;
}

//--------------------------------------------------
// copy

// 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 <class _InputIter, class _OutputIter, class _Distance>
inline _OutputIter __copy(_InputIter __first, _InputIter __last,
                          _OutputIter __result,
                          input_iterator_tag, _Distance*)
{
  for ( ; __first != __last; ++__result, ++__first)
    *__result = *__first;
  return __result;
}

template <class _RandomAccessIter, class _OutputIter, class _Distance>
inline _OutputIter
__copy(_RandomAccessIter __first, _RandomAccessIter __last,
       _OutputIter __result, random_access_iterator_tag, _Distance*)
{
  for (_Distance __n = __last - __first; __n > 0; --__n) {
    *__result = *__first;
    ++__first;
    ++__result;
  }
  return __result;
}

template <class _Tp>
inline _Tp*
__copy_trivial(const _Tp* __first, const _Tp* __last, _Tp* __result)
{
  memmove(__result, __first, sizeof(_Tp) * (__last - __first));
  return __result + (__last - __first);
}


template <class _InputIter, class _OutputIter>
inline _OutputIter __copy_aux2(_InputIter __first, _InputIter __last,
                               _OutputIter __result, __false_type)
{
  return __copy(__first, __last, __result,
                __iterator_category(__first),
                __distance_type(__first));
}

template <class _InputIter, class _OutputIter>
inline _OutputIter __copy_aux2(_InputIter __first, _InputIter __last,
                               _OutputIter __result, __true_type)
{
  return __copy(__first, __last, __result,
                __iterator_category(__first),
                __distance_type(__first));
}

template <class _Tp>
inline _Tp* __copy_aux2(_Tp* __first, _Tp* __last, _Tp* __result,
                        __true_type)
{
  return __copy_trivial(__first, __last, __result);
}

template <class _Tp>
inline _Tp* __copy_aux2(const _Tp* __first, const _Tp* __last, _Tp* __result,
                        __true_type)
{
  return __copy_trivial(__first, __last, __result);
}


template <class _InputIter, class _OutputIter, class _Tp>
inline _OutputIter __copy_aux(_InputIter __first, _InputIter __last,
                              _OutputIter __result, _Tp*)
{
  typedef typename __type_traits<_Tp>::has_trivial_assignment_operator
          _Trivial;
  return __copy_aux2(__first, __last, __result, _Trivial());
}

template<typename _InputIter, typename _OutputIter>
inline _OutputIter __copy_ni2(_InputIter __first, _InputIter __last,
                               _OutputIter __result, __true_type)
{
  return _OutputIter(__copy_aux(__first, __last, __result.base(),
                                __value_type(__first)));
}

template<typename _InputIter, typename _OutputIter>
inline _OutputIter __copy_ni2(_InputIter __first, _InputIter __last,
			      _OutputIter __result, __false_type)
{
  return __copy_aux(__first, __last, __result, __value_type(__first));
}

template<typename _InputIter, typename _OutputIter>
inline _OutputIter __copy_ni1(_InputIter __first, _InputIter __last,
                               _OutputIter __result, __true_type)
{
  typedef typename _Is_normal_iterator<_OutputIter>::_Normal __Normal;
  return __copy_ni2(__first.base(), __last.base(), __result, __Normal());
}

template<typename _InputIter, typename _OutputIter>
inline _OutputIter __copy_ni1(_InputIter __first, _InputIter __last,
                               _OutputIter __result, __false_type)
{
  typedef typename _Is_normal_iterator<_OutputIter>::_Normal __Normal;
  return __copy_ni2(__first, __last, __result, __Normal());
}

template <class _InputIter, class _OutputIter>
inline _OutputIter copy(_InputIter __first, _InputIter __last,
                        _OutputIter __result)
{
  // concept requirements
  __glibcpp_function_requires(_InputIteratorConcept<_InputIter>);
  __glibcpp_function_requires(_OutputIteratorConcept<_OutputIter,
        typename iterator_traits<_InputIter>::value_type>);

   typedef typename _Is_normal_iterator<_InputIter>::_Normal __Normal;
   return __copy_ni1(__first, __last, __result, __Normal());
}

//--------------------------------------------------
// copy_backward

template <class _BidirectionalIter1, class _BidirectionalIter2, 
          class _Distance>
inline _BidirectionalIter2 __copy_backward(_BidirectionalIter1 __first, 
                                           _BidirectionalIter1 __last, 
                                           _BidirectionalIter2 __result,
                                           bidirectional_iterator_tag,
                                           _Distance*)
{
  while (__first != __last)
    *--__result = *--__last;
  return __result;
}

template <class _RandomAccessIter, class _BidirectionalIter, class _Distance>
inline _BidirectionalIter __copy_backward(_RandomAccessIter __first, 
                                          _RandomAccessIter __last, 
                                          _BidirectionalIter __result,
                                          random_access_iterator_tag,
                                          _Distance*)
{
  for (_Distance __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 <class _BidirectionalIter1, class _BidirectionalIter2,
          class _BoolType>
struct __copy_backward_dispatch
{
  typedef typename iterator_traits<_BidirectionalIter1>::iterator_category 
          _Cat;
  typedef typename iterator_traits<_BidirectionalIter1>::difference_type
          _Distance;

  static _BidirectionalIter2 copy(_BidirectionalIter1 __first, 
                                  _BidirectionalIter1 __last, 
                                  _BidirectionalIter2 __result) {
    return __copy_backward(__first, __last, __result, _Cat(), (_Distance*) 0);
  }
};

template <class _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;
    memmove(__result - _Num, __first, sizeof(_Tp) * _Num);
    return __result - _Num;
  }
};

template <class _Tp>
struct __copy_backward_dispatch<const _Tp*, _Tp*, __true_type>
{
  static _Tp* copy(const _Tp* __first, const _Tp* __last, _Tp* __result) {
    return  __copy_backward_dispatch<_Tp*, _Tp*, __true_type>
      ::copy(__first, __last, __result);
  }
};

template <class _BI1, class _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 __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(__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 __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 __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,