callback.h

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// OSB library ************************************************ -*- C++ -*-
/*
  AUTHOR(S): Stephan Broennimann (vb)

  RCS information
   $Name: OSB_060808 $
   $Revision: 1.5 $

  License
   OSB rating and billing library for communication networks
   Copyright (C) 2004, 2005, 2006  OSB systems

   This file may be distributed and/or modify under the terms of the
   GNU General Public License (GPL) as published by the Free Software
   Foundation which is provided in the file LICENSE.GPL included in the
   packaging of this file.

   The file 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 General Public License
   for more details.

   Holders of a OSB Commercial License may use this file under the terms
   and conditions of this commercial license.
 */
#ifndef _CALLBACK_H_
#define _CALLBACK_H_

// ************************************************************************
// included header files
// + standard includes
#include <memory>

// + libraries

// + local headers

// + class declarations

// ************************************************************************
// namespace extensions
namespace OSB_LIB {

// ************************************************************************
// forward declarations

// ************************************************************************
// type definitions

// ************************************************************************
// class definitions
    class CallBack {
    public:
        typedef std::auto_ptr<CallBack> AutoPtr;
    public:
        inline CallBack();
        inline virtual ~CallBack();
        inline AutoPtr clone() const;
    public:
        virtual void operator()() const = 0;
        template<typename T> T* isa(T*& ptr);
        template<typename T> const T* isa(const T*& ptr) const;
    protected:
        inline CallBack(const CallBack& rhs);
        inline CallBack& operator=(const CallBack& rhs);
    private:
        virtual CallBack* cloneP() const = 0;
    };                                  // class CallBack
}                                       // namespace OSB_LIB

// ************************************************************************
// inline definitions
namespace OSB_LIB {
    // ********************************************************************
    // class CallBack
    CallBack::CallBack()
    {
    }

    CallBack::~CallBack()
    {
    }

    CallBack::AutoPtr CallBack::clone() const
    {
        return AutoPtr(cloneP());
    }

    CallBack::CallBack(const CallBack&)
    {
    }

    CallBack& CallBack::operator=(const CallBack&)
    {
        return *this;
    }

    template<typename T>
    T* CallBack::isa(T*& ptr)
    {
        ptr = dynamic_cast<T*>(this);
        return ptr;
    }

    template<typename T>
    const T* CallBack::isa(const T*& ptr) const
    {
        ptr = dynamic_cast<const T*>(this);
        return ptr;
    }
}                                       // namespace OSB_LIB
#endif                                  // #ifndef _CALLBACK_H_

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