sprint/function/simple_function.h

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/******************************************************************************
*   sprint::function
*
*   Copyright (C) 2005-2011  Paolo Medici <www.pmx.it>
*
*  This library 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 2.1 of the License, or (at your option) any later version.
*
*  This library 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 library; if not, write to the Free Software
*  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
*
*******************************************************************************/

#ifndef _SPRINT_FUNCTION_H
#define _SPRINT_FUNCTION_H

namespace sprint {

struct simple_function {
       
       typedef void (* Type)(void *);
       
       private:
        
       static void nothing(void *f)
       {
       }

       template< void (* F)(void)>
       static void delegate_fun(void *f)
       {
         F();
       }

       template<class T, void (T::*F)(void)>
       static void delegate_mem_fun(void * t)
       {
       ((reinterpret_cast<T*>(t))->*F)();
       }
       
       public:
       // the function jumper
       Type m_func;
       void * m_param;
       
       public:
       simple_function() : m_func(&nothing) { }
       ~simple_function() { }
       
       bool is_nothing() const { return m_func == &nothing; }
       
       void operator()(void) { m_func(m_param); }
       
       void ptr_fun(void (* func) (void *), void *param) 
         {
          m_func = func;
          m_param = param;
         }

       template<void (* F)(void)>
       void bind() 
         {
          m_func = &delegate_fun<F>;
          m_param = NULL;
         }

       template<class T, void (T::*F)(void)>
       void bind(T * _this) 
         {
          m_func = &delegate_mem_fun<T,F>;
          m_param = reinterpret_cast<void *>(_this);
         }

       };
       
};


#endif