You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
584 lines
20 KiB
584 lines
20 KiB
// Heap implementation -*- C++ -*-
|
|
|
|
// Copyright (C) 2001-2021 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 3, 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.
|
|
|
|
// Under Section 7 of GPL version 3, you are granted additional
|
|
// permissions described in the GCC Runtime Library Exception, version
|
|
// 3.1, as published by the Free Software Foundation.
|
|
|
|
// You should have received a copy of the GNU General Public License and
|
|
// a copy of the GCC Runtime Library Exception along with this program;
|
|
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
|
|
// <http://www.gnu.org/licenses/>.
|
|
|
|
/*
|
|
*
|
|
* 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 bits/stl_heap.h
|
|
* This is an internal header file, included by other library headers.
|
|
* Do not attempt to use it directly. @headername{queue}
|
|
*/
|
|
|
|
#ifndef _STL_HEAP_H
|
|
#define _STL_HEAP_H 1
|
|
|
|
#include <debug/debug.h>
|
|
#include <bits/move.h>
|
|
#include <bits/predefined_ops.h>
|
|
|
|
namespace std _GLIBCXX_VISIBILITY(default)
|
|
{
|
|
_GLIBCXX_BEGIN_NAMESPACE_VERSION
|
|
|
|
/**
|
|
* @defgroup heap_algorithms Heap
|
|
* @ingroup sorting_algorithms
|
|
*/
|
|
|
|
template<typename _RandomAccessIterator, typename _Distance,
|
|
typename _Compare>
|
|
_GLIBCXX20_CONSTEXPR
|
|
_Distance
|
|
__is_heap_until(_RandomAccessIterator __first, _Distance __n,
|
|
_Compare& __comp)
|
|
{
|
|
_Distance __parent = 0;
|
|
for (_Distance __child = 1; __child < __n; ++__child)
|
|
{
|
|
if (__comp(__first + __parent, __first + __child))
|
|
return __child;
|
|
if ((__child & 1) == 0)
|
|
++__parent;
|
|
}
|
|
return __n;
|
|
}
|
|
|
|
// __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>
|
|
_GLIBCXX20_CONSTEXPR
|
|
inline bool
|
|
__is_heap(_RandomAccessIterator __first, _Distance __n)
|
|
{
|
|
__gnu_cxx::__ops::_Iter_less_iter __comp;
|
|
return std::__is_heap_until(__first, __n, __comp) == __n;
|
|
}
|
|
|
|
template<typename _RandomAccessIterator, typename _Compare,
|
|
typename _Distance>
|
|
_GLIBCXX20_CONSTEXPR
|
|
inline bool
|
|
__is_heap(_RandomAccessIterator __first, _Compare __comp, _Distance __n)
|
|
{
|
|
typedef __decltype(__comp) _Cmp;
|
|
__gnu_cxx::__ops::_Iter_comp_iter<_Cmp> __cmp(_GLIBCXX_MOVE(__comp));
|
|
return std::__is_heap_until(__first, __n, __cmp) == __n;
|
|
}
|
|
|
|
template<typename _RandomAccessIterator>
|
|
_GLIBCXX20_CONSTEXPR
|
|
inline bool
|
|
__is_heap(_RandomAccessIterator __first, _RandomAccessIterator __last)
|
|
{ return std::__is_heap(__first, std::distance(__first, __last)); }
|
|
|
|
template<typename _RandomAccessIterator, typename _Compare>
|
|
_GLIBCXX20_CONSTEXPR
|
|
inline bool
|
|
__is_heap(_RandomAccessIterator __first, _RandomAccessIterator __last,
|
|
_Compare __comp)
|
|
{
|
|
return std::__is_heap(__first, _GLIBCXX_MOVE(__comp),
|
|
std::distance(__first, __last));
|
|
}
|
|
|
|
// Heap-manipulation functions: push_heap, pop_heap, make_heap, sort_heap,
|
|
// + is_heap and is_heap_until in C++0x.
|
|
|
|
template<typename _RandomAccessIterator, typename _Distance, typename _Tp,
|
|
typename _Compare>
|
|
_GLIBCXX20_CONSTEXPR
|
|
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) = _GLIBCXX_MOVE(*(__first + __parent));
|
|
__holeIndex = __parent;
|
|
__parent = (__holeIndex - 1) / 2;
|
|
}
|
|
*(__first + __holeIndex) = _GLIBCXX_MOVE(__value);
|
|
}
|
|
|
|
/**
|
|
* @brief Push an element onto a heap.
|
|
* @param __first Start of heap.
|
|
* @param __last End of heap + element.
|
|
* @ingroup heap_algorithms
|
|
*
|
|
* 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>
|
|
_GLIBCXX20_CONSTEXPR
|
|
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_irreflexive(__first, __last);
|
|
__glibcxx_requires_heap(__first, __last - 1);
|
|
|
|
__gnu_cxx::__ops::_Iter_less_val __comp;
|
|
_ValueType __value = _GLIBCXX_MOVE(*(__last - 1));
|
|
std::__push_heap(__first, _DistanceType((__last - __first) - 1),
|
|
_DistanceType(0), _GLIBCXX_MOVE(__value), __comp);
|
|
}
|
|
|
|
/**
|
|
* @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_algorithms
|
|
*
|
|
* 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>
|
|
_GLIBCXX20_CONSTEXPR
|
|
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_irreflexive_pred(__first, __last, __comp);
|
|
__glibcxx_requires_heap_pred(__first, __last - 1, __comp);
|
|
|
|
__decltype(__gnu_cxx::__ops::__iter_comp_val(_GLIBCXX_MOVE(__comp)))
|
|
__cmp(_GLIBCXX_MOVE(__comp));
|
|
_ValueType __value = _GLIBCXX_MOVE(*(__last - 1));
|
|
std::__push_heap(__first, _DistanceType((__last - __first) - 1),
|
|
_DistanceType(0), _GLIBCXX_MOVE(__value), __cmp);
|
|
}
|
|
|
|
template<typename _RandomAccessIterator, typename _Distance,
|
|
typename _Tp, typename _Compare>
|
|
_GLIBCXX20_CONSTEXPR
|
|
void
|
|
__adjust_heap(_RandomAccessIterator __first, _Distance __holeIndex,
|
|
_Distance __len, _Tp __value, _Compare __comp)
|
|
{
|
|
const _Distance __topIndex = __holeIndex;
|
|
_Distance __secondChild = __holeIndex;
|
|
while (__secondChild < (__len - 1) / 2)
|
|
{
|
|
__secondChild = 2 * (__secondChild + 1);
|
|
if (__comp(__first + __secondChild,
|
|
__first + (__secondChild - 1)))
|
|
__secondChild--;
|
|
*(__first + __holeIndex) = _GLIBCXX_MOVE(*(__first + __secondChild));
|
|
__holeIndex = __secondChild;
|
|
}
|
|
if ((__len & 1) == 0 && __secondChild == (__len - 2) / 2)
|
|
{
|
|
__secondChild = 2 * (__secondChild + 1);
|
|
*(__first + __holeIndex) = _GLIBCXX_MOVE(*(__first
|
|
+ (__secondChild - 1)));
|
|
__holeIndex = __secondChild - 1;
|
|
}
|
|
__decltype(__gnu_cxx::__ops::__iter_comp_val(_GLIBCXX_MOVE(__comp)))
|
|
__cmp(_GLIBCXX_MOVE(__comp));
|
|
std::__push_heap(__first, __holeIndex, __topIndex,
|
|
_GLIBCXX_MOVE(__value), __cmp);
|
|
}
|
|
|
|
template<typename _RandomAccessIterator, typename _Compare>
|
|
_GLIBCXX20_CONSTEXPR
|
|
inline void
|
|
__pop_heap(_RandomAccessIterator __first, _RandomAccessIterator __last,
|
|
_RandomAccessIterator __result, _Compare& __comp)
|
|
{
|
|
typedef typename iterator_traits<_RandomAccessIterator>::value_type
|
|
_ValueType;
|
|
typedef typename iterator_traits<_RandomAccessIterator>::difference_type
|
|
_DistanceType;
|
|
|
|
_ValueType __value = _GLIBCXX_MOVE(*__result);
|
|
*__result = _GLIBCXX_MOVE(*__first);
|
|
std::__adjust_heap(__first, _DistanceType(0),
|
|
_DistanceType(__last - __first),
|
|
_GLIBCXX_MOVE(__value), __comp);
|
|
}
|
|
|
|
/**
|
|
* @brief Pop an element off a heap.
|
|
* @param __first Start of heap.
|
|
* @param __last End of heap.
|
|
* @pre [__first, __last) is a valid, non-empty range.
|
|
* @ingroup heap_algorithms
|
|
*
|
|
* 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>
|
|
_GLIBCXX20_CONSTEXPR
|
|
inline void
|
|
pop_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_non_empty_range(__first, __last);
|
|
__glibcxx_requires_valid_range(__first, __last);
|
|
__glibcxx_requires_irreflexive(__first, __last);
|
|
__glibcxx_requires_heap(__first, __last);
|
|
|
|
if (__last - __first > 1)
|
|
{
|
|
--__last;
|
|
__gnu_cxx::__ops::_Iter_less_iter __comp;
|
|
std::__pop_heap(__first, __last, __last, __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_algorithms
|
|
*
|
|
* 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>
|
|
_GLIBCXX20_CONSTEXPR
|
|
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_irreflexive_pred(__first, __last, __comp);
|
|
__glibcxx_requires_non_empty_range(__first, __last);
|
|
__glibcxx_requires_heap_pred(__first, __last, __comp);
|
|
|
|
if (__last - __first > 1)
|
|
{
|
|
typedef __decltype(__comp) _Cmp;
|
|
__gnu_cxx::__ops::_Iter_comp_iter<_Cmp> __cmp(_GLIBCXX_MOVE(__comp));
|
|
--__last;
|
|
std::__pop_heap(__first, __last, __last, __cmp);
|
|
}
|
|
}
|
|
|
|
template<typename _RandomAccessIterator, typename _Compare>
|
|
_GLIBCXX20_CONSTEXPR
|
|
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;
|
|
|
|
if (__last - __first < 2)
|
|
return;
|
|
|
|
const _DistanceType __len = __last - __first;
|
|
_DistanceType __parent = (__len - 2) / 2;
|
|
while (true)
|
|
{
|
|
_ValueType __value = _GLIBCXX_MOVE(*(__first + __parent));
|
|
std::__adjust_heap(__first, __parent, __len, _GLIBCXX_MOVE(__value),
|
|
__comp);
|
|
if (__parent == 0)
|
|
return;
|
|
__parent--;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief Construct a heap over a range.
|
|
* @param __first Start of heap.
|
|
* @param __last End of heap.
|
|
* @ingroup heap_algorithms
|
|
*
|
|
* This operation makes the elements in [__first,__last) into a heap.
|
|
*/
|
|
template<typename _RandomAccessIterator>
|
|
_GLIBCXX20_CONSTEXPR
|
|
inline void
|
|
make_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_irreflexive(__first, __last);
|
|
|
|
__gnu_cxx::__ops::_Iter_less_iter __comp;
|
|
std::__make_heap(__first, __last, __comp);
|
|
}
|
|
|
|
/**
|
|
* @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_algorithms
|
|
*
|
|
* This operation makes the elements in [__first,__last) into a heap.
|
|
* Comparisons are made using __comp.
|
|
*/
|
|
template<typename _RandomAccessIterator, typename _Compare>
|
|
_GLIBCXX20_CONSTEXPR
|
|
inline void
|
|
make_heap(_RandomAccessIterator __first, _RandomAccessIterator __last,
|
|
_Compare __comp)
|
|
{
|
|
// concept requirements
|
|
__glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<
|
|
_RandomAccessIterator>)
|
|
__glibcxx_requires_valid_range(__first, __last);
|
|
__glibcxx_requires_irreflexive_pred(__first, __last, __comp);
|
|
|
|
typedef __decltype(__comp) _Cmp;
|
|
__gnu_cxx::__ops::_Iter_comp_iter<_Cmp> __cmp(_GLIBCXX_MOVE(__comp));
|
|
std::__make_heap(__first, __last, __cmp);
|
|
}
|
|
|
|
template<typename _RandomAccessIterator, typename _Compare>
|
|
_GLIBCXX20_CONSTEXPR
|
|
void
|
|
__sort_heap(_RandomAccessIterator __first, _RandomAccessIterator __last,
|
|
_Compare& __comp)
|
|
{
|
|
while (__last - __first > 1)
|
|
{
|
|
--__last;
|
|
std::__pop_heap(__first, __last, __last, __comp);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief Sort a heap.
|
|
* @param __first Start of heap.
|
|
* @param __last End of heap.
|
|
* @ingroup heap_algorithms
|
|
*
|
|
* This operation sorts the valid heap in the range [__first,__last).
|
|
*/
|
|
template<typename _RandomAccessIterator>
|
|
_GLIBCXX20_CONSTEXPR
|
|
inline 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_irreflexive(__first, __last);
|
|
__glibcxx_requires_heap(__first, __last);
|
|
|
|
__gnu_cxx::__ops::_Iter_less_iter __comp;
|
|
std::__sort_heap(__first, __last, __comp);
|
|
}
|
|
|
|
/**
|
|
* @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_algorithms
|
|
*
|
|
* This operation sorts the valid heap in the range [__first,__last).
|
|
* Comparisons are made using __comp.
|
|
*/
|
|
template<typename _RandomAccessIterator, typename _Compare>
|
|
_GLIBCXX20_CONSTEXPR
|
|
inline 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_irreflexive_pred(__first, __last, __comp);
|
|
__glibcxx_requires_heap_pred(__first, __last, __comp);
|
|
|
|
typedef __decltype(__comp) _Cmp;
|
|
__gnu_cxx::__ops::_Iter_comp_iter<_Cmp> __cmp(_GLIBCXX_MOVE(__comp));
|
|
std::__sort_heap(__first, __last, __cmp);
|
|
}
|
|
|
|
#if __cplusplus >= 201103L
|
|
/**
|
|
* @brief Search the end of a heap.
|
|
* @param __first Start of range.
|
|
* @param __last End of range.
|
|
* @return An iterator pointing to the first element not in the heap.
|
|
* @ingroup heap_algorithms
|
|
*
|
|
* This operation returns the last iterator i in [__first, __last) for which
|
|
* the range [__first, i) is a heap.
|
|
*/
|
|
template<typename _RandomAccessIterator>
|
|
_GLIBCXX20_CONSTEXPR
|
|
inline _RandomAccessIterator
|
|
is_heap_until(_RandomAccessIterator __first, _RandomAccessIterator __last)
|
|
{
|
|
// concept requirements
|
|
__glibcxx_function_requires(_RandomAccessIteratorConcept<
|
|
_RandomAccessIterator>)
|
|
__glibcxx_function_requires(_LessThanComparableConcept<
|
|
typename iterator_traits<_RandomAccessIterator>::value_type>)
|
|
__glibcxx_requires_valid_range(__first, __last);
|
|
__glibcxx_requires_irreflexive(__first, __last);
|
|
|
|
__gnu_cxx::__ops::_Iter_less_iter __comp;
|
|
return __first +
|
|
std::__is_heap_until(__first, std::distance(__first, __last), __comp);
|
|
}
|
|
|
|
/**
|
|
* @brief Search the end of a heap using comparison functor.
|
|
* @param __first Start of range.
|
|
* @param __last End of range.
|
|
* @param __comp Comparison functor to use.
|
|
* @return An iterator pointing to the first element not in the heap.
|
|
* @ingroup heap_algorithms
|
|
*
|
|
* This operation returns the last iterator i in [__first, __last) for which
|
|
* the range [__first, i) is a heap. Comparisons are made using __comp.
|
|
*/
|
|
template<typename _RandomAccessIterator, typename _Compare>
|
|
_GLIBCXX20_CONSTEXPR
|
|
inline _RandomAccessIterator
|
|
is_heap_until(_RandomAccessIterator __first, _RandomAccessIterator __last,
|
|
_Compare __comp)
|
|
{
|
|
// concept requirements
|
|
__glibcxx_function_requires(_RandomAccessIteratorConcept<
|
|
_RandomAccessIterator>)
|
|
__glibcxx_requires_valid_range(__first, __last);
|
|
__glibcxx_requires_irreflexive_pred(__first, __last, __comp);
|
|
|
|
typedef __decltype(__comp) _Cmp;
|
|
__gnu_cxx::__ops::_Iter_comp_iter<_Cmp> __cmp(_GLIBCXX_MOVE(__comp));
|
|
return __first
|
|
+ std::__is_heap_until(__first, std::distance(__first, __last), __cmp);
|
|
}
|
|
|
|
/**
|
|
* @brief Determines whether a range is a heap.
|
|
* @param __first Start of range.
|
|
* @param __last End of range.
|
|
* @return True if range is a heap, false otherwise.
|
|
* @ingroup heap_algorithms
|
|
*/
|
|
template<typename _RandomAccessIterator>
|
|
_GLIBCXX20_CONSTEXPR
|
|
inline bool
|
|
is_heap(_RandomAccessIterator __first, _RandomAccessIterator __last)
|
|
{ return std::is_heap_until(__first, __last) == __last; }
|
|
|
|
/**
|
|
* @brief Determines whether a range is a heap using comparison functor.
|
|
* @param __first Start of range.
|
|
* @param __last End of range.
|
|
* @param __comp Comparison functor to use.
|
|
* @return True if range is a heap, false otherwise.
|
|
* @ingroup heap_algorithms
|
|
*/
|
|
template<typename _RandomAccessIterator, typename _Compare>
|
|
_GLIBCXX20_CONSTEXPR
|
|
inline bool
|
|
is_heap(_RandomAccessIterator __first, _RandomAccessIterator __last,
|
|
_Compare __comp)
|
|
{
|
|
// concept requirements
|
|
__glibcxx_function_requires(_RandomAccessIteratorConcept<
|
|
_RandomAccessIterator>)
|
|
__glibcxx_requires_valid_range(__first, __last);
|
|
__glibcxx_requires_irreflexive_pred(__first, __last, __comp);
|
|
|
|
const auto __dist = std::distance(__first, __last);
|
|
typedef __decltype(__comp) _Cmp;
|
|
__gnu_cxx::__ops::_Iter_comp_iter<_Cmp> __cmp(_GLIBCXX_MOVE(__comp));
|
|
return std::__is_heap_until(__first, __dist, __cmp) == __dist;
|
|
}
|
|
#endif
|
|
|
|
_GLIBCXX_END_NAMESPACE_VERSION
|
|
} // namespace
|
|
|
|
#endif /* _STL_HEAP_H */
|