// 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) 1996,1997
* 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.
*/
// hacked together from various stl part to make JSC, WC compile
#ifndef _UTILITY_H
#define _UTILITY_H 1
#include <iterator>
#define __glibcxx_function_requires(a)
#define __glibcxx_function_requires(a)
#define __glibcxx_requires_valid_range(a,b)
#define __glibcxx_requires_heap(a,b)
namespace std
{
/// pair holds two objects of arbitrary type.
template<typename _T1, typename _T2>
struct pair
{
typedef _T1 first_type; ///< @c first_type is the first bound type
typedef _T2 second_type; ///< @c second_type is the second bound type
_T1 first; ///< @c first is a copy of the first object
_T2 second; ///< @c second is a copy of the second object
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 265. std::pair::pair() effects overly restrictive
/** The default constructor creates @c first and @c second using their
* respective default constructors. */
pair()
: first(), second() { }
/** Two objects may be passed to a @c pair constructor to be copied. */
pair(const _T1& __a, const _T2& __b)
: first(__a), second(__b) { }
/** There is also a templated copy ctor for the @c pair typename itself. */
template<typename _U1, typename _U2>
pair(const pair<_U1, _U2>& __p)
: first(__p.first), second(__p.second) { }
};
/// Two pairs of the same type are equal iff their members are equal.
template<typename _T1, typename _T2>
inline bool
operator==(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
{ return __x.first == __y.first && __x.second == __y.second; }
/// <http://gcc.gnu.org/onlinedocs/libstdc++/20_util/howto.html#pairlt>
template<typename _T1, typename _T2>
inline bool
operator<(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
{ return __x.first < __y.first
|| (!(__y.first < __x.first) && __x.second < __y.second); }
/// Uses @c operator== to find the result.
template<typename _T1, typename _T2>
inline bool
operator!=(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
{ return !(__x == __y); }
/// Uses @c operator< to find the result.
template<typename _T1, typename _T2>
inline bool
operator>(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
{ return __y < __x; }
/// Uses @c operator< to find the result.
template<typename _T1, typename _T2>
inline bool
operator<=(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
{ return !(__y < __x); }
/// Uses @c operator< to find the result.
template<typename _T1, typename _T2>
inline bool
operator>=(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
{ return !(__x < __y); }
/**
* @brief A convenience wrapper for creating a pair from two objects.
* @param x The first object.
* @param y The second object.
* @return A newly-constructed pair<> object of the appropriate type.
*
* The standard requires that the objects be passed by reference-to-const,
* but LWG issue #181 says they should be passed by const value. We follow
* the LWG by default.
*/
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 181. make_pair() unintended behavior
template<typename _T1, typename _T2>
inline pair<_T1, _T2>
make_pair(_T1 __x, _T2 __y)
{ return pair<_T1, _T2>(__x, __y); }
/*
// 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)
{
typedef typename iterator_traits<_RandomAccessIterator>::difference_type
_Distance;
*__result = *__first;
std::__adjust_heap(__first, _Distance(0), _Distance(__last - __first),
__value);
}
/**
* @brief Pop an element off a heap.
* @param first Start of heap.
* @param last End of heap.
* @ingroup heap
*
* This operation pops the top of the heap. The elements first and last-1
* are swapped and [first,last-1) is made into a heap.
*/
template<typename _RandomAccessIterator>
inline void
pop_heap(_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);
__glibcxx_requires_heap(__first, __last);
std::__pop_heap(__first, __last - 1, __last - 1,
_ValueType(*(__last - 1)));
}
template<typename _RandomAccessIterator, typename _Distance,
typename _Tp, typename _Compare>
void
__adjust_heap(_RandomAccessIterator __first, _Distance __holeIndex,
_Distance __len, _Tp __value, _Compare __comp)
{
const _Distance __topIndex = __holeIndex;
_Distance __secondChild = 2 * __holeIndex + 2;
while (__secondChild < __len)
{
if (__comp(*(__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, __comp);
}
template<typename _RandomAccessIterator, typename _Tp, typename _Compare>
inline void
__pop_heap(_RandomAccessIterator __first, _RandomAccessIterator __last,
_RandomAccessIterator __result, _Tp __value, _Compare __comp)
{
typedef typename iterator_traits<_RandomAccessIterator>::difference_type
_Distance;
*__result = *__first;
std::__adjust_heap(__first, _Distance(0), _Distance(__last - __first),
__value, __comp);
}
/**
* @brief Pop an element off a heap using comparison functor.
* @param first Start of heap.
* @param last End of heap.
* @param comp Comparison functor to use.
* @ingroup heap
*
* This operation pops the top of the heap. The elements first and last-1
* are swapped and [first,last-1) is made into a heap. Comparisons are
* made using comp.
*/
template<typename _RandomAccessIterator, typename _Compare>
inline void
pop_heap(_RandomAccessIterator __first,
_RandomAccessIterator __last, _Compare __comp)
{
// concept requirements
__glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<
_RandomAccessIterator>)
__glibcxx_requires_valid_range(__first, __last);
__glibcxx_requires_heap_pred(__first, __last, __comp);
typedef typename iterator_traits<_RandomAccessIterator>::value_type
_ValueType;
std::__pop_heap(__first, __last - 1, __last - 1,
_ValueType(*(__last - 1)), __comp);
}
/**
* @brief Construct a heap over a range.
* @param first Start of heap.
* @param last End of heap.
* @ingroup heap
*
* This operation makes the elements in [first,last) into a heap.
*/
template<typename _RandomAccessIterator>
void
make_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);
if (__last - __first < 2)
return;
const _DistanceType __len = __last - __first;
_DistanceType __parent = (__len - 2) / 2;
while (true)
{
std::__adjust_heap(__first, __parent, __len,
_ValueType(*(__first + __parent)));
if (__parent == 0)
return;
__parent--;
}
}
/**
* @brief Construct a heap over a range using comparison functor.
* @param first Start of heap.
* @param last End of heap.
* @param comp Comparison functor to use.
* @ingroup heap
*
* This operation makes the elements in [first,last) into a heap.
* Comparisons are made using comp.
*/
template<typename _RandomAccessIterator, typename _Compare>
inline void
make_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);
if (__last - __first < 2)
return;
const _DistanceType __len = __last - __first;
_DistanceType __parent = (__len - 2) / 2;
while (true)
{
std::__adjust_heap(__first, __parent, __len,
_ValueType(*(__first + __parent)), __comp);
if (__parent == 0)
return;
__parent--;
}
}
/**
* @brief Sort a heap.
* @param first Start of heap.
* @param last End of heap.
* @ingroup heap
*
* This operation sorts the valid heap in the range [first,last).
*/
template<typename _RandomAccessIterator>
void
sort_heap(_RandomAccessIterator __first, _RandomAccessIterator __last)
{
// concept requirements
__glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<
_RandomAccessIterator>)
__glibcxx_function_requires(_LessThanComparableConcept<
typename iterator_traits<_RandomAccessIterator>::value_type>)
__glibcxx_requires_valid_range(__first, __last);
// __glibcxx_requires_heap(__first, __last);
while (__last - __first > 1)
std::pop_heap(__first, __last--);
}
/**
* @brief Sort a heap using comparison functor.
* @param first Start of heap.
* @param last End of heap.
* @param comp Comparison functor to use.
* @ingroup heap
*
* This operation sorts the valid heap in the range [first,last).
* Comparisons are made using comp.
*/
template<typename _RandomAccessIterator, typename _Compare>
void
sort_heap(_RandomAccessIterator __first, _RandomAccessIterator __last,
_Compare __comp)
{
// concept requirements
__glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<
_RandomAccessIterator>)
__glibcxx_requires_valid_range(__first, __last);
__glibcxx_requires_heap_pred(__first, __last, __comp);
while (__last - __first > 1)
std::pop_heap(__first, __last--, __comp);
}
} // namespace std
#endif