stl_stack.h

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00001 // Stack implementation -*- C++ -*-
00002 
00003 // Copyright (C) 2001 Free Software Foundation, Inc.
00004 //
00005 // This file is part of the GNU ISO C++ Library.  This library is free
00006 // software; you can redistribute it and/or modify it under the
00007 // terms of the GNU General Public License as published by the
00008 // Free Software Foundation; either version 2, or (at your option)
00009 // any later version.
00010 
00011 // This library is distributed in the hope that it will be useful,
00012 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00013 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00014 // GNU General Public License for more details.
00015 
00016 // You should have received a copy of the GNU General Public License along
00017 // with this library; see the file COPYING.  If not, write to the Free
00018 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
00019 // USA.
00020 
00021 // As a special exception, you may use this file as part of a free software
00022 // library without restriction.  Specifically, if other files instantiate
00023 // templates or use macros or inline functions from this file, or you compile
00024 // this file and link it with other files to produce an executable, this
00025 // file does not by itself cause the resulting executable to be covered by
00026 // the GNU General Public License.  This exception does not however
00027 // invalidate any other reasons why the executable file might be covered by
00028 // the GNU General Public License.
00029 
00030 /*
00031  *
00032  * Copyright (c) 1994
00033  * Hewlett-Packard Company
00034  *
00035  * Permission to use, copy, modify, distribute and sell this software
00036  * and its documentation for any purpose is hereby granted without fee,
00037  * provided that the above copyright notice appear in all copies and
00038  * that both that copyright notice and this permission notice appear
00039  * in supporting documentation.  Hewlett-Packard Company makes no
00040  * representations about the suitability of this software for any
00041  * purpose.  It is provided "as is" without express or implied warranty.
00042  *
00043  *
00044  * Copyright (c) 1996,1997
00045  * Silicon Graphics Computer Systems, Inc.
00046  *
00047  * Permission to use, copy, modify, distribute and sell this software
00048  * and its documentation for any purpose is hereby granted without fee,
00049  * provided that the above copyright notice appear in all copies and
00050  * that both that copyright notice and this permission notice appear
00051  * in supporting documentation.  Silicon Graphics makes no
00052  * representations about the suitability of this software for any
00053  * purpose.  It is provided "as is" without express or implied warranty.
00054  */
00055 
00061 #ifndef __GLIBCPP_INTERNAL_STACK_H
00062 #define __GLIBCPP_INTERNAL_STACK_H
00063 
00064 #include <bits/concept_check.h>
00065 
00066 namespace std
00067 {
00068 
00069 // Forward declarations of operators == and <, needed for friend declaration.
00070 
00071 template <class _Tp, 
00072           class _Sequence = deque<_Tp> >
00073 class stack;
00074 
00075 template <class _Tp, class _Seq>
00076 bool operator==(const stack<_Tp,_Seq>& __x, const stack<_Tp,_Seq>& __y);
00077 
00078 template <class _Tp, class _Seq>
00079 bool operator<(const stack<_Tp,_Seq>& __x, const stack<_Tp,_Seq>& __y);
00080 
00081 
00082 template <class _Tp, class _Sequence>
00083 class stack
00084 {
00085   // concept requirements
00086   __glibcpp_class_requires(_Tp, _SGIAssignableConcept)
00087   __glibcpp_class_requires(_Sequence, _BackInsertionSequenceConcept)
00088   typedef typename _Sequence::value_type _Sequence_value_type;
00089   __glibcpp_class_requires2(_Tp, _Sequence_value_type, _SameTypeConcept);
00090 
00091   template <class _Tp1, class _Seq1>
00092   friend bool operator== (const stack<_Tp1, _Seq1>&,
00093                           const stack<_Tp1, _Seq1>&);
00094   template <class _Tp1, class _Seq1>
00095   friend bool operator< (const stack<_Tp1, _Seq1>&,
00096                          const stack<_Tp1, _Seq1>&);
00097 public:
00098   typedef typename _Sequence::value_type      value_type;
00099   typedef typename _Sequence::size_type       size_type;
00100   typedef          _Sequence                  container_type;
00101 
00102   typedef typename _Sequence::reference       reference;
00103   typedef typename _Sequence::const_reference const_reference;
00104 protected:
00105   _Sequence c;
00106 public:
00107   stack() : c() {}
00108   explicit stack(const _Sequence& __s) : c(__s) {}
00109 
00110   bool empty() const { return c.empty(); }
00111   size_type size() const { return c.size(); }
00112   reference top() { return c.back(); }
00113   const_reference top() const { return c.back(); }
00114   void push(const value_type& __x) { c.push_back(__x); }
00115   void pop() { c.pop_back(); }
00116 };
00117 
00118 template <class _Tp, class _Seq>
00119 bool operator==(const stack<_Tp,_Seq>& __x, const stack<_Tp,_Seq>& __y)
00120 {
00121   return __x.c == __y.c;
00122 }
00123 
00124 template <class _Tp, class _Seq>
00125 bool operator<(const stack<_Tp,_Seq>& __x, const stack<_Tp,_Seq>& __y)
00126 {
00127   return __x.c < __y.c;
00128 }
00129 
00130 template <class _Tp, class _Seq>
00131 bool operator!=(const stack<_Tp,_Seq>& __x, const stack<_Tp,_Seq>& __y)
00132 {
00133   return !(__x == __y);
00134 }
00135 
00136 template <class _Tp, class _Seq>
00137 bool operator>(const stack<_Tp,_Seq>& __x, const stack<_Tp,_Seq>& __y)
00138 {
00139   return __y < __x;
00140 }
00141 
00142 template <class _Tp, class _Seq>
00143 bool operator<=(const stack<_Tp,_Seq>& __x, const stack<_Tp,_Seq>& __y)
00144 {
00145   return !(__y < __x);
00146 }
00147 
00148 template <class _Tp, class _Seq>
00149 bool operator>=(const stack<_Tp,_Seq>& __x, const stack<_Tp,_Seq>& __y)
00150 {
00151   return !(__x < __y);
00152 }
00153 
00154 } // namespace std
00155 
00156 #endif /* __GLIBCPP_INTERNAL_STACK_H */
00157 
00158 // Local Variables:
00159 // mode:C++
00160 // End:

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