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4_5_2_stl_stack.h
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146 lines (118 loc) · 4.37 KB
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/*
*
* 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.
*/
/* NOTE: This is an internal header file, included by other STL headers.
* You should not attempt to use it directly.
*/
#ifndef __SGI_STL_INTERNAL_STACK_H
#define __SGI_STL_INTERNAL_STACK_H
#include <sequence_concepts.h>
__STL_BEGIN_NAMESPACE
// Forward declarations of operators == and <, needed for friend declaration.
template <class _Tp,
class _Sequence __STL_DEPENDENT_DEFAULT_TMPL(deque<_Tp>) >
class stack;
template <class _Tp, class _Seq>
bool operator==(const stack<_Tp,_Seq>& __x, const stack<_Tp,_Seq>& __y);
template <class _Tp, class _Seq>
bool operator<(const stack<_Tp,_Seq>& __x, const stack<_Tp,_Seq>& __y);
template <class _Tp, class _Sequence>
class stack {
// requirements:
__STL_CLASS_REQUIRES(_Tp, _Assignable);
__STL_CLASS_REQUIRES(_Sequence, _BackInsertionSequence);
typedef typename _Sequence::value_type _Sequence_value_type;
__STL_CLASS_REQUIRES_SAME_TYPE(_Tp, _Sequence_value_type);
#ifdef __STL_MEMBER_TEMPLATES
template <class _Tp1, class _Seq1>
friend bool operator== (const stack<_Tp1, _Seq1>&,
const stack<_Tp1, _Seq1>&);
template <class _Tp1, class _Seq1>
friend bool operator< (const stack<_Tp1, _Seq1>&,
const stack<_Tp1, _Seq1>&);
#else /* __STL_MEMBER_TEMPLATES */
friend bool __STD_QUALIFIER
// 非模板参数会展开为<>
operator== __STL_NULL_TMPL_ARGS (const stack&, const stack&);
friend bool __STD_QUALIFIER
operator< __STL_NULL_TMPL_ARGS (const stack&, const stack&);
#endif /* __STL_MEMBER_TEMPLATES */
public:
typedef typename _Sequence::value_type value_type;
typedef typename _Sequence::size_type size_type;
typedef _Sequence container_type;
typedef typename _Sequence::reference reference;
typedef typename _Sequence::const_reference const_reference;
protected:
_Sequence c; // 底层容器
public:
stack() : c() {}
explicit stack(const _Sequence& __s) : c(__s) {}
// 使用容器完成所有操作，只公开允许的接口
bool empty() const { return c.empty(); }
size_type size() const { return c.size(); }
reference top() { return c.back(); }
const_reference top() const { return c.back(); }
// deque两头可进出，stack是末端进，末端出
void push(const value_type& __x) { c.push_back(__x); }
void pop() { c.pop_back(); }
};
template <class _Tp, class _Seq>
bool operator==(const stack<_Tp,_Seq>& __x, const stack<_Tp,_Seq>& __y)
{
return __x.c == __y.c;
}
template <class _Tp, class _Seq>
bool operator<(const stack<_Tp,_Seq>& __x, const stack<_Tp,_Seq>& __y)
{
return __x.c < __y.c;
}
#ifdef __STL_FUNCTION_TMPL_PARTIAL_ORDER
template <class _Tp, class _Seq>
bool operator!=(const stack<_Tp,_Seq>& __x, const stack<_Tp,_Seq>& __y)
{
return !(__x == __y);
}
template <class _Tp, class _Seq>
bool operator>(const stack<_Tp,_Seq>& __x, const stack<_Tp,_Seq>& __y)
{
return __y < __x;
}
template <class _Tp, class _Seq>
bool operator<=(const stack<_Tp,_Seq>& __x, const stack<_Tp,_Seq>& __y)
{
return !(__y < __x);
}
template <class _Tp, class _Seq>
bool operator>=(const stack<_Tp,_Seq>& __x, const stack<_Tp,_Seq>& __y)
{
return !(__x < __y);
}
#endif /* __STL_FUNCTION_TMPL_PARTIAL_ORDER */
__STL_END_NAMESPACE
#endif /* __SGI_STL_INTERNAL_STACK_H */
// Local Variables:
// mode:C++
// End: