9536ca346b
2002-12-20 Sylvain Pion <Sylvain.Pion@mpi-sb.mpg.de> * include/bits/stl_deque.h: Fix typo. * include/bits/stl_list.h: Same. * include/bits/stl_map.h: Same. * include/bits/stl_multimap.h: Same. * include/bits/stl_queue.h: Same. * include/bits/stl_stack.h: Same. * include/bits/stl_vector.h: Same. From-SVN: r60442
431 lines
15 KiB
C++
431 lines
15 KiB
C++
// Queue implementation -*- C++ -*-
|
|
|
|
// Copyright (C) 2001, 2002 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.
|
|
*/
|
|
|
|
/** @file stl_queue.h
|
|
* This is an internal header file, included by other library headers.
|
|
* You should not attempt to use it directly.
|
|
*/
|
|
|
|
#ifndef __GLIBCPP_INTERNAL_QUEUE_H
|
|
#define __GLIBCPP_INTERNAL_QUEUE_H
|
|
|
|
#include <bits/concept_check.h>
|
|
|
|
namespace std
|
|
{
|
|
// Forward declarations of operators < and ==, needed for friend declaration.
|
|
|
|
template <typename _Tp, typename _Sequence = deque<_Tp> >
|
|
class queue;
|
|
|
|
template <typename _Tp, typename _Seq>
|
|
inline bool operator==(const queue<_Tp,_Seq>&, const queue<_Tp,_Seq>&);
|
|
|
|
template <typename _Tp, typename _Seq>
|
|
inline bool operator<(const queue<_Tp,_Seq>&, const queue<_Tp,_Seq>&);
|
|
|
|
|
|
/**
|
|
* @brief A standard container giving FIFO behavior.
|
|
*
|
|
* @ingroup Containers
|
|
* @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 "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>
|
|
class queue
|
|
{
|
|
// concept requirements
|
|
typedef typename _Sequence::value_type _Sequence_value_type;
|
|
__glibcpp_class_requires(_Tp, _SGIAssignableConcept)
|
|
__glibcpp_class_requires(_Sequence, _FrontInsertionSequenceConcept)
|
|
__glibcpp_class_requires(_Sequence, _BackInsertionSequenceConcept)
|
|
__glibcpp_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.
|
|
*/
|
|
explicit
|
|
queue(const _Sequence& __c = _Sequence())
|
|
: c(__c) {}
|
|
|
|
/**
|
|
* 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() { return c.front(); }
|
|
|
|
/**
|
|
* Returns a read-only (constant) reference to the data at the first
|
|
* element of the %queue.
|
|
*/
|
|
const_reference
|
|
front() const { return c.front(); }
|
|
|
|
/**
|
|
* Returns a read/write reference to the data at the last element of the
|
|
* %queue.
|
|
*/
|
|
reference
|
|
back() { return c.back(); }
|
|
|
|
/**
|
|
* Returns a read-only (constant) reference to the data at the last
|
|
* element of the %queue.
|
|
*/
|
|
const_reference
|
|
back() const { 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); }
|
|
|
|
/**
|
|
* @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() { c.pop_front(); }
|
|
};
|
|
|
|
|
|
/**
|
|
* @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 _Sequence>
|
|
inline bool
|
|
operator==(const queue<_Tp,_Sequence>& __x, const queue<_Tp,_Sequence>& __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 _Sequence>
|
|
inline bool
|
|
operator<(const queue<_Tp,_Sequence>& __x, const queue<_Tp,_Sequence>& __y)
|
|
{ return __x.c < __y.c; }
|
|
|
|
/// Based on operator==
|
|
template <typename _Tp, typename _Sequence>
|
|
inline bool
|
|
operator!=(const queue<_Tp,_Sequence>& __x, const queue<_Tp,_Sequence>& __y)
|
|
{ return !(__x == __y); }
|
|
|
|
/// Based on operator<
|
|
template <typename _Tp, typename _Sequence>
|
|
inline bool
|
|
operator>(const queue<_Tp,_Sequence>& __x, const queue<_Tp,_Sequence>& __y)
|
|
{ return __y < __x; }
|
|
|
|
/// Based on operator<
|
|
template <typename _Tp, typename _Sequence>
|
|
inline bool
|
|
operator<=(const queue<_Tp,_Sequence>& __x, const queue<_Tp,_Sequence>& __y)
|
|
{ return !(__y < __x); }
|
|
|
|
/// Based on operator<
|
|
template <typename _Tp, typename _Sequence>
|
|
inline bool
|
|
operator>=(const queue<_Tp,_Sequence>& __x, const queue<_Tp,_Sequence>& __y)
|
|
{ return !(__x < __y); }
|
|
|
|
|
|
/**
|
|
* @brief A standard container automatically sorting its contents.
|
|
*
|
|
* @ingroup Containers
|
|
* @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 sorting and first-in-first-out %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 "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/FIFO 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;
|
|
__glibcpp_class_requires(_Tp, _SGIAssignableConcept)
|
|
__glibcpp_class_requires(_Sequence, _SequenceConcept)
|
|
__glibcpp_class_requires(_Sequence, _RandomAccessContainerConcept)
|
|
__glibcpp_class_requires2(_Tp, _Sequence_value_type, _SameTypeConcept)
|
|
__glibcpp_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.
|
|
*/
|
|
explicit
|
|
priority_queue(const _Compare& __x = _Compare(),
|
|
const _Sequence& __s = _Sequence())
|
|
: c(__s), comp(__x)
|
|
{ make_heap(c.begin(), c.end(), comp); }
|
|
|
|
/**
|
|
* @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 s20_3_1_base functor base classes@endlink.
|
|
*/
|
|
template <typename _InputIterator>
|
|
priority_queue(_InputIterator __first, _InputIterator __last,
|
|
const _Compare& __x = _Compare(),
|
|
const _Sequence& __s = _Sequence())
|
|
: c(__s), comp(__x)
|
|
{
|
|
c.insert(c.end(), __first, __last);
|
|
make_heap(c.begin(), c.end(), comp);
|
|
}
|
|
|
|
/**
|
|
* 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 { 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)
|
|
{
|
|
try
|
|
{
|
|
c.push_back(__x);
|
|
push_heap(c.begin(), c.end(), comp);
|
|
}
|
|
catch(...)
|
|
{
|
|
c.clear();
|
|
__throw_exception_again;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @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()
|
|
{
|
|
try
|
|
{
|
|
pop_heap(c.begin(), c.end(), comp);
|
|
c.pop_back();
|
|
}
|
|
catch(...)
|
|
{
|
|
c.clear();
|
|
__throw_exception_again;
|
|
}
|
|
}
|
|
};
|
|
|
|
// No equality/comparison operators are provided for priority_queue.
|
|
} // namespace std
|
|
|
|
#endif /* __GLIBCPP_INTERNAL_QUEUE_H */
|