STK_Proxy.h

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/*--------------------------------------------------------------------*/
/*     Copyright (C) 2004-2007  Serge Iovleff

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as
    published by the Free Software Foundation; either version 2 of the
    License, or (at your option) any later version.

    This program 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 Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this program; if not, write to the
    Free Software Foundation, Inc.,
    59 Temple Place,
    Suite 330,
    Boston, MA 02111-1307
    USA

    Contact : Serge.Iovleff@stkpp.org
*/

/*
 * Project:  stkpp::STKernel::Base
 * Purpose:  Define the Proxy classes for wrapping any types.
 * Author:   Serge Iovleff, serge.iovleff@stkpp.org
 *
 **/

#ifndef STK_PROXY_H
#define STK_PROXY_H

namespace STK 
{

 struct IProxy
 { 
   virtual ~IProxy() {}
 };
 
 template<class TYPE>
 class ConstProxy : public IProxy
 {
   protected:
     TYPE const& x_; 

   public:
     inline ConstProxy(TYPE const& x) : x_(x)
     { ;}

     virtual ~ConstProxy() {}

     inline operator TYPE const &() const
     { return x_;}
};

 template<class TYPE>
 class Proxy : public IProxy
 {
   protected:
     TYPE& x_; 

   public:
     inline Proxy(TYPE &x) : x_(x)
     { ;}

     inline Proxy& operator=(TYPE const& x)
     {
       x_ = x;
       return *this;
     }

     virtual ~Proxy() {}

     inline Proxy& operator=(const Proxy<TYPE>& x)
     {
       x_ = x;
       return *this;
     }

     inline Proxy& operator=(const ConstProxy<TYPE>& x)
     {
       x_ = x;
       return *this;
     }

     inline operator TYPE &()
     { return x_;}
     
     inline operator TYPE const &() const
     { return x_;}
};

} // namespace STK

#endif /*STK_PROXY_H*/