# 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: