560 lines
18 KiB
C++
560 lines
18 KiB
C++
// Queue implementation -*- C++ -*-
|
|
|
|
// Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
|
|
// 2010, 2011
|
|
// 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) 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.
|
|
*/
|
|
|
|
/** @file bits/stl_queue.h
|
|
* This is an internal header file, included by other library headers.
|
|
* Do not attempt to use it directly. @headername{queue}
|
|
*/
|
|
|
|
#ifndef _STL_QUEUE_H
|
|
#define _STL_QUEUE_H 1
|
|
|
|
#include <bits/concept_check.h>
|
|
#include <debug/debug.h>
|
|
|
|
namespace std _GLIBCXX_VISIBILITY(default)
|
|
{
|
|
_GLIBCXX_BEGIN_NAMESPACE_VERSION
|
|
|
|
/**
|
|
* @brief A standard container giving FIFO behavior.
|
|
*
|
|
* @ingroup sequences
|
|
*
|
|
* Meets many of the requirements of a
|
|
* <a href="tables.html#65">container</a>,
|
|
* but does not define anything to do with iterators. Very few of the
|
|
* other standard container interfaces are defined.
|
|
*
|
|
* This is not a true container, but an @e adaptor. It holds another
|
|
* container, and provides a wrapper interface to that container. The
|
|
* wrapper is what enforces strict first-in-first-out %queue behavior.
|
|
*
|
|
* The second template parameter defines the type of the underlying
|
|
* sequence/container. It defaults to std::deque, but it can be any type
|
|
* that supports @c front, @c back, @c push_back, and @c pop_front,
|
|
* such as std::list or an appropriate user-defined type.
|
|
*
|
|
* Members not found in @a normal containers are @c container_type,
|
|
* which is a typedef for the second Sequence parameter, and @c push and
|
|
* @c pop, which are standard %queue/FIFO operations.
|
|
*/
|
|
template<typename _Tp, typename _Sequence = deque<_Tp> >
|
|
class queue
|
|
{
|
|
// concept requirements
|
|
typedef typename _Sequence::value_type _Sequence_value_type;
|
|
__glibcxx_class_requires(_Tp, _SGIAssignableConcept)
|
|
__glibcxx_class_requires(_Sequence, _FrontInsertionSequenceConcept)
|
|
__glibcxx_class_requires(_Sequence, _BackInsertionSequenceConcept)
|
|
__glibcxx_class_requires2(_Tp, _Sequence_value_type, _SameTypeConcept)
|
|
|
|
template<typename _Tp1, typename _Seq1>
|
|
friend bool
|
|
operator==(const queue<_Tp1, _Seq1>&, const queue<_Tp1, _Seq1>&);
|
|
|
|
template<typename _Tp1, typename _Seq1>
|
|
friend bool
|
|
operator<(const queue<_Tp1, _Seq1>&, const queue<_Tp1, _Seq1>&);
|
|
|
|
public:
|
|
typedef typename _Sequence::value_type value_type;
|
|
typedef typename _Sequence::reference reference;
|
|
typedef typename _Sequence::const_reference const_reference;
|
|
typedef typename _Sequence::size_type size_type;
|
|
typedef _Sequence container_type;
|
|
|
|
protected:
|
|
/**
|
|
* 'c' is the underlying container. Maintainers wondering why
|
|
* this isn't uglified as per style guidelines should note that
|
|
* this name is specified in the standard, [23.2.3.1]. (Why?
|
|
* Presumably for the same reason that it's protected instead
|
|
* of private: to allow derivation. But none of the other
|
|
* containers allow for derivation. Odd.)
|
|
*/
|
|
_Sequence c;
|
|
|
|
public:
|
|
/**
|
|
* @brief Default constructor creates no elements.
|
|
*/
|
|
#ifndef __GXX_EXPERIMENTAL_CXX0X__
|
|
explicit
|
|
queue(const _Sequence& __c = _Sequence())
|
|
: c(__c) { }
|
|
#else
|
|
explicit
|
|
queue(const _Sequence& __c)
|
|
: c(__c) { }
|
|
|
|
explicit
|
|
queue(_Sequence&& __c = _Sequence())
|
|
: c(std::move(__c)) { }
|
|
#endif
|
|
|
|
/**
|
|
* Returns true if the %queue is empty.
|
|
*/
|
|
bool
|
|
empty() const
|
|
{ return c.empty(); }
|
|
|
|
/** Returns the number of elements in the %queue. */
|
|
size_type
|
|
size() const
|
|
{ return c.size(); }
|
|
|
|
/**
|
|
* Returns a read/write reference to the data at the first
|
|
* element of the %queue.
|
|
*/
|
|
reference
|
|
front()
|
|
{
|
|
__glibcxx_requires_nonempty();
|
|
return c.front();
|
|
}
|
|
|
|
/**
|
|
* Returns a read-only (constant) reference to the data at the first
|
|
* element of the %queue.
|
|
*/
|
|
const_reference
|
|
front() const
|
|
{
|
|
__glibcxx_requires_nonempty();
|
|
return c.front();
|
|
}
|
|
|
|
/**
|
|
* Returns a read/write reference to the data at the last
|
|
* element of the %queue.
|
|
*/
|
|
reference
|
|
back()
|
|
{
|
|
__glibcxx_requires_nonempty();
|
|
return c.back();
|
|
}
|
|
|
|
/**
|
|
* Returns a read-only (constant) reference to the data at the last
|
|
* element of the %queue.
|
|
*/
|
|
const_reference
|
|
back() const
|
|
{
|
|
__glibcxx_requires_nonempty();
|
|
return c.back();
|
|
}
|
|
|
|
/**
|
|
* @brief Add data to the end of the %queue.
|
|
* @param x Data to be added.
|
|
*
|
|
* This is a typical %queue operation. The function creates an
|
|
* element at the end of the %queue and assigns the given data
|
|
* to it. The time complexity of the operation depends on the
|
|
* underlying sequence.
|
|
*/
|
|
void
|
|
push(const value_type& __x)
|
|
{ c.push_back(__x); }
|
|
|
|
#ifdef __GXX_EXPERIMENTAL_CXX0X__
|
|
void
|
|
push(value_type&& __x)
|
|
{ c.push_back(std::move(__x)); }
|
|
|
|
template<typename... _Args>
|
|
void
|
|
emplace(_Args&&... __args)
|
|
{ c.emplace_back(std::forward<_Args>(__args)...); }
|
|
#endif
|
|
|
|
/**
|
|
* @brief Removes first element.
|
|
*
|
|
* This is a typical %queue operation. It shrinks the %queue by one.
|
|
* The time complexity of the operation depends on the underlying
|
|
* sequence.
|
|
*
|
|
* Note that no data is returned, and if the first element's
|
|
* data is needed, it should be retrieved before pop() is
|
|
* called.
|
|
*/
|
|
void
|
|
pop()
|
|
{
|
|
__glibcxx_requires_nonempty();
|
|
c.pop_front();
|
|
}
|
|
|
|
#ifdef __GXX_EXPERIMENTAL_CXX0X__
|
|
void
|
|
swap(queue& __q)
|
|
{
|
|
using std::swap;
|
|
swap(c, __q.c);
|
|
}
|
|
#endif
|
|
};
|
|
|
|
/**
|
|
* @brief Queue equality comparison.
|
|
* @param x A %queue.
|
|
* @param y A %queue of the same type as @a x.
|
|
* @return True iff the size and elements of the queues are equal.
|
|
*
|
|
* This is an equivalence relation. Complexity and semantics depend on the
|
|
* underlying sequence type, but the expected rules are: this relation is
|
|
* linear in the size of the sequences, and queues are considered equivalent
|
|
* if their sequences compare equal.
|
|
*/
|
|
template<typename _Tp, typename _Seq>
|
|
inline bool
|
|
operator==(const queue<_Tp, _Seq>& __x, const queue<_Tp, _Seq>& __y)
|
|
{ return __x.c == __y.c; }
|
|
|
|
/**
|
|
* @brief Queue ordering relation.
|
|
* @param x A %queue.
|
|
* @param y A %queue of the same type as @a x.
|
|
* @return True iff @a x is lexicographically less than @a y.
|
|
*
|
|
* This is an total ordering relation. Complexity and semantics
|
|
* depend on the underlying sequence type, but the expected rules
|
|
* are: this relation is linear in the size of the sequences, the
|
|
* elements must be comparable with @c <, and
|
|
* std::lexicographical_compare() is usually used to make the
|
|
* determination.
|
|
*/
|
|
template<typename _Tp, typename _Seq>
|
|
inline bool
|
|
operator<(const queue<_Tp, _Seq>& __x, const queue<_Tp, _Seq>& __y)
|
|
{ return __x.c < __y.c; }
|
|
|
|
/// Based on operator==
|
|
template<typename _Tp, typename _Seq>
|
|
inline bool
|
|
operator!=(const queue<_Tp, _Seq>& __x, const queue<_Tp, _Seq>& __y)
|
|
{ return !(__x == __y); }
|
|
|
|
/// Based on operator<
|
|
template<typename _Tp, typename _Seq>
|
|
inline bool
|
|
operator>(const queue<_Tp, _Seq>& __x, const queue<_Tp, _Seq>& __y)
|
|
{ return __y < __x; }
|
|
|
|
/// Based on operator<
|
|
template<typename _Tp, typename _Seq>
|
|
inline bool
|
|
operator<=(const queue<_Tp, _Seq>& __x, const queue<_Tp, _Seq>& __y)
|
|
{ return !(__y < __x); }
|
|
|
|
/// Based on operator<
|
|
template<typename _Tp, typename _Seq>
|
|
inline bool
|
|
operator>=(const queue<_Tp, _Seq>& __x, const queue<_Tp, _Seq>& __y)
|
|
{ return !(__x < __y); }
|
|
|
|
#ifdef __GXX_EXPERIMENTAL_CXX0X__
|
|
template<typename _Tp, typename _Seq>
|
|
inline void
|
|
swap(queue<_Tp, _Seq>& __x, queue<_Tp, _Seq>& __y)
|
|
{ __x.swap(__y); }
|
|
|
|
template<typename _Tp, typename _Seq, typename _Alloc>
|
|
struct uses_allocator<queue<_Tp, _Seq>, _Alloc>
|
|
: public uses_allocator<_Seq, _Alloc>::type { };
|
|
#endif
|
|
|
|
/**
|
|
* @brief A standard container automatically sorting its contents.
|
|
*
|
|
* @ingroup sequences
|
|
*
|
|
* This is not a true container, but an @e adaptor. It holds
|
|
* another container, and provides a wrapper interface to that
|
|
* container. The wrapper is what enforces priority-based sorting
|
|
* and %queue behavior. Very few of the standard container/sequence
|
|
* interface requirements are met (e.g., iterators).
|
|
*
|
|
* The second template parameter defines the type of the underlying
|
|
* sequence/container. It defaults to std::vector, but it can be
|
|
* any type that supports @c front(), @c push_back, @c pop_back,
|
|
* and random-access iterators, such as std::deque or an
|
|
* appropriate user-defined type.
|
|
*
|
|
* The third template parameter supplies the means of making
|
|
* priority comparisons. It defaults to @c less<value_type> but
|
|
* can be anything defining a strict weak ordering.
|
|
*
|
|
* Members not found in @a normal containers are @c container_type,
|
|
* which is a typedef for the second Sequence parameter, and @c
|
|
* push, @c pop, and @c top, which are standard %queue operations.
|
|
*
|
|
* @note No equality/comparison operators are provided for
|
|
* %priority_queue.
|
|
*
|
|
* @note Sorting of the elements takes place as they are added to,
|
|
* and removed from, the %priority_queue using the
|
|
* %priority_queue's member functions. If you access the elements
|
|
* by other means, and change their data such that the sorting
|
|
* order would be different, the %priority_queue will not re-sort
|
|
* the elements for you. (How could it know to do so?)
|
|
*/
|
|
template<typename _Tp, typename _Sequence = vector<_Tp>,
|
|
typename _Compare = less<typename _Sequence::value_type> >
|
|
class priority_queue
|
|
{
|
|
// concept requirements
|
|
typedef typename _Sequence::value_type _Sequence_value_type;
|
|
__glibcxx_class_requires(_Tp, _SGIAssignableConcept)
|
|
__glibcxx_class_requires(_Sequence, _SequenceConcept)
|
|
__glibcxx_class_requires(_Sequence, _RandomAccessContainerConcept)
|
|
__glibcxx_class_requires2(_Tp, _Sequence_value_type, _SameTypeConcept)
|
|
__glibcxx_class_requires4(_Compare, bool, _Tp, _Tp,
|
|
_BinaryFunctionConcept)
|
|
|
|
public:
|
|
typedef typename _Sequence::value_type value_type;
|
|
typedef typename _Sequence::reference reference;
|
|
typedef typename _Sequence::const_reference const_reference;
|
|
typedef typename _Sequence::size_type size_type;
|
|
typedef _Sequence container_type;
|
|
|
|
protected:
|
|
// See queue::c for notes on these names.
|
|
_Sequence c;
|
|
_Compare comp;
|
|
|
|
public:
|
|
/**
|
|
* @brief Default constructor creates no elements.
|
|
*/
|
|
#ifndef __GXX_EXPERIMENTAL_CXX0X__
|
|
explicit
|
|
priority_queue(const _Compare& __x = _Compare(),
|
|
const _Sequence& __s = _Sequence())
|
|
: c(__s), comp(__x)
|
|
{ std::make_heap(c.begin(), c.end(), comp); }
|
|
#else
|
|
explicit
|
|
priority_queue(const _Compare& __x,
|
|
const _Sequence& __s)
|
|
: c(__s), comp(__x)
|
|
{ std::make_heap(c.begin(), c.end(), comp); }
|
|
|
|
explicit
|
|
priority_queue(const _Compare& __x = _Compare(),
|
|
_Sequence&& __s = _Sequence())
|
|
: c(std::move(__s)), comp(__x)
|
|
{ std::make_heap(c.begin(), c.end(), comp); }
|
|
#endif
|
|
|
|
/**
|
|
* @brief Builds a %queue from a range.
|
|
* @param first An input iterator.
|
|
* @param last An input iterator.
|
|
* @param x A comparison functor describing a strict weak ordering.
|
|
* @param s An initial sequence with which to start.
|
|
*
|
|
* Begins by copying @a s, inserting a copy of the elements
|
|
* from @a [first,last) into the copy of @a s, then ordering
|
|
* the copy according to @a x.
|
|
*
|
|
* For more information on function objects, see the
|
|
* documentation on @link functors functor base
|
|
* classes@endlink.
|
|
*/
|
|
#ifndef __GXX_EXPERIMENTAL_CXX0X__
|
|
template<typename _InputIterator>
|
|
priority_queue(_InputIterator __first, _InputIterator __last,
|
|
const _Compare& __x = _Compare(),
|
|
const _Sequence& __s = _Sequence())
|
|
: c(__s), comp(__x)
|
|
{
|
|
__glibcxx_requires_valid_range(__first, __last);
|
|
c.insert(c.end(), __first, __last);
|
|
std::make_heap(c.begin(), c.end(), comp);
|
|
}
|
|
#else
|
|
template<typename _InputIterator>
|
|
priority_queue(_InputIterator __first, _InputIterator __last,
|
|
const _Compare& __x,
|
|
const _Sequence& __s)
|
|
: c(__s), comp(__x)
|
|
{
|
|
__glibcxx_requires_valid_range(__first, __last);
|
|
c.insert(c.end(), __first, __last);
|
|
std::make_heap(c.begin(), c.end(), comp);
|
|
}
|
|
|
|
template<typename _InputIterator>
|
|
priority_queue(_InputIterator __first, _InputIterator __last,
|
|
const _Compare& __x = _Compare(),
|
|
_Sequence&& __s = _Sequence())
|
|
: c(std::move(__s)), comp(__x)
|
|
{
|
|
__glibcxx_requires_valid_range(__first, __last);
|
|
c.insert(c.end(), __first, __last);
|
|
std::make_heap(c.begin(), c.end(), comp);
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* Returns true if the %queue is empty.
|
|
*/
|
|
bool
|
|
empty() const
|
|
{ return c.empty(); }
|
|
|
|
/** Returns the number of elements in the %queue. */
|
|
size_type
|
|
size() const
|
|
{ return c.size(); }
|
|
|
|
/**
|
|
* Returns a read-only (constant) reference to the data at the first
|
|
* element of the %queue.
|
|
*/
|
|
const_reference
|
|
top() const
|
|
{
|
|
__glibcxx_requires_nonempty();
|
|
return c.front();
|
|
}
|
|
|
|
/**
|
|
* @brief Add data to the %queue.
|
|
* @param x Data to be added.
|
|
*
|
|
* This is a typical %queue operation.
|
|
* The time complexity of the operation depends on the underlying
|
|
* sequence.
|
|
*/
|
|
void
|
|
push(const value_type& __x)
|
|
{
|
|
c.push_back(__x);
|
|
std::push_heap(c.begin(), c.end(), comp);
|
|
}
|
|
|
|
#ifdef __GXX_EXPERIMENTAL_CXX0X__
|
|
void
|
|
push(value_type&& __x)
|
|
{
|
|
c.push_back(std::move(__x));
|
|
std::push_heap(c.begin(), c.end(), comp);
|
|
}
|
|
|
|
template<typename... _Args>
|
|
void
|
|
emplace(_Args&&... __args)
|
|
{
|
|
c.emplace_back(std::forward<_Args>(__args)...);
|
|
std::push_heap(c.begin(), c.end(), comp);
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* @brief Removes first element.
|
|
*
|
|
* This is a typical %queue operation. It shrinks the %queue
|
|
* by one. The time complexity of the operation depends on the
|
|
* underlying sequence.
|
|
*
|
|
* Note that no data is returned, and if the first element's
|
|
* data is needed, it should be retrieved before pop() is
|
|
* called.
|
|
*/
|
|
void
|
|
pop()
|
|
{
|
|
__glibcxx_requires_nonempty();
|
|
std::pop_heap(c.begin(), c.end(), comp);
|
|
c.pop_back();
|
|
}
|
|
|
|
#ifdef __GXX_EXPERIMENTAL_CXX0X__
|
|
void
|
|
swap(priority_queue& __pq)
|
|
{
|
|
using std::swap;
|
|
swap(c, __pq.c);
|
|
swap(comp, __pq.comp);
|
|
}
|
|
#endif
|
|
};
|
|
|
|
// No equality/comparison operators are provided for priority_queue.
|
|
|
|
#ifdef __GXX_EXPERIMENTAL_CXX0X__
|
|
template<typename _Tp, typename _Sequence, typename _Compare>
|
|
inline void
|
|
swap(priority_queue<_Tp, _Sequence, _Compare>& __x,
|
|
priority_queue<_Tp, _Sequence, _Compare>& __y)
|
|
{ __x.swap(__y); }
|
|
|
|
template<typename _Tp, typename _Sequence, typename _Compare,
|
|
typename _Alloc>
|
|
struct uses_allocator<priority_queue<_Tp, _Sequence, _Compare>, _Alloc>
|
|
: public uses_allocator<_Sequence, _Alloc>::type { };
|
|
#endif
|
|
|
|
_GLIBCXX_END_NAMESPACE_VERSION
|
|
} // namespace
|
|
|
|
#endif /* _STL_QUEUE_H */
|