stl_heap.h

openRisc2000编译链接器等,用于i386 cygwin

// Heap implementation -*- C++ -*-

// Copyright (C) 2001, 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) 1997
 * 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_heap.h
 *  This is an internal header file, included by other library headers.
 *  You should not attempt to use it directly.
 */

#ifndef _STL_HEAP_H
#define _STL_HEAP_H 1

#include <debug/debug.h>

namespace std
{
  // is_heap, a predicate testing whether or not a range is
  // a heap.  This function is an extension, not part of the C++
  // standard.
  template<typename _RandomAccessIterator, typename _Distance>
    bool
    __is_heap(_RandomAccessIterator __first, _Distance __n)
    {
      _Distance __parent = 0;
      for (_Distance __child = 1; __child < __n; ++__child)
	{
	  if (__first[__parent] < __first[__child])
	    return false;
	  if ((__child & 1) == 0)
	    ++__parent;
	}
      return true;
    }

  template<typename _RandomAccessIterator, typename _Distance,
           typename _StrictWeakOrdering>
    bool
    __is_heap(_RandomAccessIterator __first, _StrictWeakOrdering __comp,
	      _Distance __n)
    {
      _Distance __parent = 0;
      for (_Distance __child = 1; __child < __n; ++__child)
	{
	  if (__comp(__first[__parent], __first[__child]))
	    return false;
	  if ((__child & 1) == 0)
	    ++__parent;
	}
      return true;
    }

  template<typename _RandomAccessIterator>
    bool
    __is_heap(_RandomAccessIterator __first, _RandomAccessIterator __last)
    { return std::__is_heap(__first, std::distance(__first, __last)); }

  template<typename _RandomAccessIterator, typename _StrictWeakOrdering>
    bool
    __is_heap(_RandomAccessIterator __first, _RandomAccessIterator __last,
	    _StrictWeakOrdering __comp)
    { return std::__is_heap(__first, __comp, std::distance(__first, __last)); }

  // Heap-manipulation functions: push_heap, pop_heap, make_heap, sort_heap.

  template<typename _RandomAccessIterator, typename _Distance, typename _Tp>
    void
    __push_heap(_RandomAccessIterator __first,
		_Distance __holeIndex, _Distance __topIndex, _Tp __value)
    {
      _Distance __parent = (__holeIndex - 1) / 2;
      while (__holeIndex > __topIndex && *(__first + __parent) < __value)
	{
	  *(__first + __holeIndex) = *(__first + __parent);
	  __holeIndex = __parent;
	  __parent = (__holeIndex - 1) / 2;
	}
      *(__first + __holeIndex) = __value;
    }

  /**
   *  @brief  Push an element onto a heap.
   *  @param  first  Start of heap.
   *  @param  last   End of heap + element.
   *  @ingroup heap
   *
   *  This operation pushes the element at last-1 onto the valid heap over the
   *  range [first,last-1).  After completion, [first,last) is a valid heap.
  */
  template<typename _RandomAccessIterator>
    inline void
    push_heap(_RandomAccessIterator __first, _RandomAccessIterator __last)
    {
      typedef typename iterator_traits<_RandomAccessIterator>::value_type
	  _ValueType;
      typedef typename iterator_traits<_RandomAccessIterator>::difference_type
	  _DistanceType;

      // concept requirements
      __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<
	    _RandomAccessIterator>)
      __glibcxx_function_requires(_LessThanComparableConcept<_ValueType>)
      __glibcxx_requires_valid_range(__first, __last);
      //      __glibcxx_requires_heap(__first, __last - 1);

      std::__push_heap(__first, _DistanceType((__last - __first) - 1),
		       _DistanceType(0), _ValueType(*(__last - 1)));
    }

  template<typename _RandomAccessIterator, typename _Distance, typename _Tp,
	    typename _Compare>
    void
    __push_heap(_RandomAccessIterator __first, _Distance __holeIndex,
		_Distance __topIndex, _Tp __value, _Compare __comp)
    {
      _Distance __parent = (__holeIndex - 1) / 2;
      while (__holeIndex > __topIndex
	     && __comp(*(__first + __parent), __value))
	{
	  *(__first + __holeIndex) = *(__first + __parent);
	  __holeIndex = __parent;
	  __parent = (__holeIndex - 1) / 2;
	}
      *(__first + __holeIndex) = __value;
    }

  /**
   *  @brief  Push an element onto a heap using comparison functor.
   *  @param  first  Start of heap.
   *  @param  last   End of heap + element.
   *  @param  comp   Comparison functor.
   *  @ingroup heap
   *
   *  This operation pushes the element at last-1 onto the valid heap over the
   *  range [first,last-1).  After completion, [first,last) is a valid heap.
   *  Compare operations are performed using comp.
  */
  template<typename _RandomAccessIterator, typename _Compare>
    inline void
    push_heap(_RandomAccessIterator __first, _RandomAccessIterator __last,
	      _Compare __comp)
    {
      typedef typename iterator_traits<_RandomAccessIterator>::value_type
	  _ValueType;
      typedef typename iterator_traits<_RandomAccessIterator>::difference_type
	  _DistanceType;

      // concept requirements
      __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<
	    _RandomAccessIterator>)
      __glibcxx_requires_valid_range(__first, __last);
      __glibcxx_requires_heap_pred(__first, __last - 1, __comp);

      std::__push_heap(__first, _DistanceType((__last - __first) - 1),
		       _DistanceType(0), _ValueType(*(__last - 1)), __comp);
    }

  template<typename _RandomAccessIterator, typename _Distance, typename _Tp>
    void
    __adjust_heap(_RandomAccessIterator __first, _Distance __holeIndex,
		  _Distance __len, _Tp __value)
    {
      const _Distance __topIndex = __holeIndex;
      _Distance __secondChild = 2 * __holeIndex + 2;
      while (__secondChild < __len)
	{
	  if (*(__first + __secondChild) < *(__first + (__secondChild - 1)))
	    __secondChild--;
	  *(__first + __holeIndex) = *(__first + __secondChild);
	  __holeIndex = __secondChild;
	  __secondChild = 2 * (__secondChild + 1);
	}
      if (__secondChild == __len)
	{
	  *(__first + __holeIndex) = *(__first + (__secondChild - 1));
	  __holeIndex = __secondChild - 1;
	}
      std::__push_heap(__first, __holeIndex, __topIndex, __value);
    }

  template<typename _RandomAccessIterator, typename _Tp>
    inline void
    __pop_heap(_RandomAccessIterator __first, _RandomAccessIterator __last,
	       _RandomAccessIterator __result, _Tp __value)
    {