// -*- C++ -*-
#ifndef __STD_STACK__
#define __STD_STACK__

/***************************************************************************
 *
 * stack - Declaration for the Standard Library stack class
 *
 ***************************************************************************
 *    
 *  Copyright 2000 Compaq Computer Corporation
 *
 *  COMPAQ Registered in U.S. Patent and Trademark Office.
 *
 *  Confidential computer software. Valid license from Compaq required for
 *  possession, use or copying. Consistent with FAR 12.211 and 12.212,
 *  Commercial Computer Software, Computer Software Documentation, and
 *  Technical Data for Commercial Items are licensed to the U.S. Government
 *  under vendor's standard commercial 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.
 *
 *
 ***************************************************************************
 *
 * (c) Copyright 1994, 1998 Rogue Wave Software, Inc.
 * ALL RIGHTS RESERVED
 *
 * The software and information contained herein are proprietary to, and
 * comprise valuable trade secrets of, Rogue Wave Software, Inc., which
 * intends to preserve as trade secrets such software and information.
 * This software is furnished pursuant to a written license agreement and
 * may be used, copied, transmitted, and stored only in accordance with
 * the terms of such license and with the inclusion of the above copyright
 * notice.  This software and information or any other copies thereof may
 * not be provided or otherwise made available to any other person.
 *
 * Notwithstanding any other lease or license that may pertain to, or
 * accompany the delivery of, this computer software and information, the
 * rights of the Government regarding its use, reproduction and disclosure
 * are as set forth in Section 52.227-19 of the FARS Computer
 * Software-Restricted Rights clause.
 * 
 * Use, duplication, or disclosure by the Government is subject to
 * restrictions as set forth in subparagraph (c)(1)(ii) of the Rights in
 * Technical Data and Computer Software clause at DFARS 252.227-7013.
 * Contractor/Manufacturer is Rogue Wave Software, Inc.,
 * P.O. Box 2328, Corvallis, Oregon 97339.
 *
 * This computer software and information is distributed with "restricted
 * rights."  Use, duplication or disclosure is subject to restrictions as
 * set forth in NASA FAR SUP 18-52.227-79 (April 1985) "Commercial
 * Computer Software-Restricted Rights (April 1985)."  If the Clause at
 * 18-52.227-74 "Rights in Data General" is specified in the contract,
 * then the "Alternate III" clause applies.
 *
 **************************************************************************/

#if defined(__DECCXX)
#   ifdef __PRAGMA_ENVIRONMENT
#      pragma __environment __save
#      pragma __environment __header_defaults
#   endif
#endif

#include <stdcomp>

#include <algorithm>
#include <deque>

#if defined(__VMS) && defined(__DECCXX) && !defined(__DECFIXCXXL1158)
#pragma __extern_prefix __save
#pragma __extern_prefix "CXXL$" 
#endif

#ifndef _RWSTD_NO_NAMESPACE
namespace std {
#endif

  template <class T, class Container _RWSTD_COMPLEX_DEFAULT(deque<T>) > 
  class stack;

#ifdef _RWSTD_NO_UNDEFINED_FRIEND
  template <class T, class Container>
  inline bool operator==(const stack<T,Container>& x, 
                         const stack<T,Container>& y);
  template <class T, class Container>
  inline bool operator<(const stack<T,Container>& x, 
                        const stack<T,Container>& y);
#endif  

  template <class T, class Container>
  class stack
  {
#if defined(__DECCXX) && !defined(__DECFIXCXXL978)
    friend bool operator== <T, Container> (const stack<T,Container>& x,
#else
    friend bool operator== (const stack<T,Container>& x,
#endif
                            const stack<T,Container>& y);
#if defined(__DECCXX) && !defined(__DECFIXCXXL978)
    friend bool operator< <T, Container> (const stack<T,Container>& x,
#else
    friend bool operator< (const stack<T,Container>& x,
#endif
                           const stack<T,Container>& y);
  public:
    
    typedef _TYPENAME Container::value_type         value_type;
    typedef _TYPENAME Container::size_type          size_type;
    typedef _TYPENAME Container::reference          reference;
    typedef _TYPENAME Container::const_reference    const_reference;
    typedef Container                               container_type;

  protected:
    
    Container c;

  public:
    _EXPLICIT stack(const Container& co _RWSTD_DEFAULT_ARG(Container())) 
      : c(co)
    { ; }

#ifdef _RWSTD_NO_DEFAULT_TEMPLATE_ARGS    
    stack(void) : c(Container())
    { ; }
#endif

    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();  }
    void              push  (const value_type& x)       { c.push_back(x);   }
    void              pop   ()                          { c.pop_back();     }
  };

  template <class T, class Container>
  inline bool operator== (const stack<T,Container>& x, 
                          const stack<T,Container>& y)
  {
    return x.c == y.c;
  }

  template <class T, class Container>
  inline bool operator< (const stack<T,Container>& x, 
                         const stack<T,Container>& y)
  {
    return x.c < y.c;
  }

  template <class T, class Container>
  inline bool operator!= (const stack<T,Container>& x, 
                          const stack<T,Container>& y)
  {
    return !(x == y);
  }

  template <class T, class Container>
  inline bool operator> (const stack<T,Container>& x, 
                         const stack<T,Container>& y)
  {
    return y < x;
  }

  template <class T, class Container>
  inline bool operator>= (const stack<T,Container>& x, 
                          const stack<T,Container>& y)
  {
    return !(x < y);
  }

  template <class T, class Container>
  inline bool operator<= (const stack<T,Container>& x, 
                          const stack<T,Container>& y)
  {
    return !(y <  x);
  }

#ifndef _RWSTD_NO_NAMESPACE
}
#endif

#if defined(__VMS) && defined(__DECCXX) && !defined(__DECFIXCXXL1158)
#   pragma __extern_prefix __restore
#endif

#if defined(__DECCXX)
#   ifdef __PRAGMA_ENVIRONMENT
#      pragma __environment __restore
#   endif
#endif

#endif /*__STD_STACK__*/
