290 lines
9.2 KiB
C++
290 lines
9.2 KiB
C++
// Stack implementation -*- C++ -*-
|
|
|
|
// Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
|
|
// 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 stl_stack.h
|
|
* This is an internal header file, included by other library headers.
|
|
* You should not attempt to use it directly.
|
|
*/
|
|
|
|
#ifndef _STL_STACK_H
|
|
#define _STL_STACK_H 1
|
|
|
|
#include <bits/concept_check.h>
|
|
#include <debug/debug.h>
|
|
|
|
_GLIBCXX_BEGIN_NAMESPACE(std)
|
|
|
|
/**
|
|
* @brief A standard container giving FILO 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-last-out %stack 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 back, @c push_back, and @c pop_front,
|
|
* such as std::list, std::vector, 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, @c pop, and @c top, which are standard %stack/FILO
|
|
* operations.
|
|
*/
|
|
template<typename _Tp, typename _Sequence = deque<_Tp> >
|
|
class stack
|
|
{
|
|
// concept requirements
|
|
typedef typename _Sequence::value_type _Sequence_value_type;
|
|
__glibcxx_class_requires(_Tp, _SGIAssignableConcept)
|
|
__glibcxx_class_requires(_Sequence, _BackInsertionSequenceConcept)
|
|
__glibcxx_class_requires2(_Tp, _Sequence_value_type, _SameTypeConcept)
|
|
|
|
template<typename _Tp1, typename _Seq1>
|
|
friend bool
|
|
operator==(const stack<_Tp1, _Seq1>&, const stack<_Tp1, _Seq1>&);
|
|
|
|
template<typename _Tp1, typename _Seq1>
|
|
friend bool
|
|
operator<(const stack<_Tp1, _Seq1>&, const stack<_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:
|
|
// See queue::c for notes on this name.
|
|
_Sequence c;
|
|
|
|
public:
|
|
// XXX removed old def ctor, added def arg to this one to match 14882
|
|
/**
|
|
* @brief Default constructor creates no elements.
|
|
*/
|
|
#ifndef __GXX_EXPERIMENTAL_CXX0X__
|
|
explicit
|
|
stack(const _Sequence& __c = _Sequence())
|
|
: c(__c) { }
|
|
#else
|
|
explicit
|
|
stack(const _Sequence& __c)
|
|
: c(__c) { }
|
|
|
|
explicit
|
|
stack(_Sequence&& __c = _Sequence())
|
|
: c(std::move(__c)) { }
|
|
#endif
|
|
|
|
/**
|
|
* Returns true if the %stack is empty.
|
|
*/
|
|
bool
|
|
empty() const
|
|
{ return c.empty(); }
|
|
|
|
/** Returns the number of elements in the %stack. */
|
|
size_type
|
|
size() const
|
|
{ return c.size(); }
|
|
|
|
/**
|
|
* Returns a read/write reference to the data at the first
|
|
* element of the %stack.
|
|
*/
|
|
reference
|
|
top()
|
|
{
|
|
__glibcxx_requires_nonempty();
|
|
return c.back();
|
|
}
|
|
|
|
/**
|
|
* Returns a read-only (constant) reference to the data at the first
|
|
* element of the %stack.
|
|
*/
|
|
const_reference
|
|
top() const
|
|
{
|
|
__glibcxx_requires_nonempty();
|
|
return c.back();
|
|
}
|
|
|
|
/**
|
|
* @brief Add data to the top of the %stack.
|
|
* @param x Data to be added.
|
|
*
|
|
* This is a typical %stack operation. The function creates an
|
|
* element at the top of the %stack 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 %stack operation. It shrinks the %stack
|
|
* 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_back();
|
|
}
|
|
|
|
#ifdef __GXX_EXPERIMENTAL_CXX0X__
|
|
void
|
|
swap(stack& __s)
|
|
{ c.swap(__s.c); }
|
|
#endif
|
|
};
|
|
|
|
/**
|
|
* @brief Stack equality comparison.
|
|
* @param x A %stack.
|
|
* @param y A %stack of the same type as @a x.
|
|
* @return True iff the size and elements of the stacks 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
|
|
* stacks are considered equivalent if their sequences compare
|
|
* equal.
|
|
*/
|
|
template<typename _Tp, typename _Seq>
|
|
inline bool
|
|
operator==(const stack<_Tp, _Seq>& __x, const stack<_Tp, _Seq>& __y)
|
|
{ return __x.c == __y.c; }
|
|
|
|
/**
|
|
* @brief Stack ordering relation.
|
|
* @param x A %stack.
|
|
* @param y A %stack 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 stack<_Tp, _Seq>& __x, const stack<_Tp, _Seq>& __y)
|
|
{ return __x.c < __y.c; }
|
|
|
|
/// Based on operator==
|
|
template<typename _Tp, typename _Seq>
|
|
inline bool
|
|
operator!=(const stack<_Tp, _Seq>& __x, const stack<_Tp, _Seq>& __y)
|
|
{ return !(__x == __y); }
|
|
|
|
/// Based on operator<
|
|
template<typename _Tp, typename _Seq>
|
|
inline bool
|
|
operator>(const stack<_Tp, _Seq>& __x, const stack<_Tp, _Seq>& __y)
|
|
{ return __y < __x; }
|
|
|
|
/// Based on operator<
|
|
template<typename _Tp, typename _Seq>
|
|
inline bool
|
|
operator<=(const stack<_Tp, _Seq>& __x, const stack<_Tp, _Seq>& __y)
|
|
{ return !(__y < __x); }
|
|
|
|
/// Based on operator<
|
|
template<typename _Tp, typename _Seq>
|
|
inline bool
|
|
operator>=(const stack<_Tp, _Seq>& __x, const stack<_Tp, _Seq>& __y)
|
|
{ return !(__x < __y); }
|
|
|
|
#ifdef __GXX_EXPERIMENTAL_CXX0X__
|
|
template<typename _Tp, typename _Seq>
|
|
inline void
|
|
swap(stack<_Tp, _Seq>& __x, stack<_Tp, _Seq>& __y)
|
|
{ __x.swap(__y); }
|
|
#endif
|
|
|
|
_GLIBCXX_END_NAMESPACE
|
|
|
|
#endif /* _STL_STACK_H */
|