function.h

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/******************************************************************************
The MIT License(MIT)

Embedded Template Library.

Copyright(c) 2014 jwellbelove

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files(the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions :

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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SOFTWARE.
******************************************************************************/

#ifndef __ETL_FUNCTION__
#define __ETL_FUNCTION__

//*****************************************************************************
//*****************************************************************************

namespace etl
{
  //***************************************************************************
  //***************************************************************************
  template <typename TParameter>
  class ifunction
  {
  public:

    typedef TParameter parameter_type; 

    //*************************************************************************
    //*************************************************************************
    virtual void operator ()(TParameter) = 0;
  };

  //***************************************************************************
  //***************************************************************************
  template <>
  class ifunction<void>
  {
  public:

    //*************************************************************************
    //*************************************************************************
    virtual void operator ()() = 0;
  };

  //***************************************************************************
  //***************************************************************************
  template <typename TObject, typename TParameter>
  class function : public ifunction<TParameter>
  {
  public:

    typedef TObject    object_type;    
    typedef TParameter parameter_type; 

    //*************************************************************************
    //*************************************************************************
    function(TObject& object, void(TObject::* p_function)(TParameter))
      : p_object(&object),
        p_function(p_function)
    {
    }

    //*************************************************************************
    //*************************************************************************
    virtual void operator ()(TParameter data)
    {
      // Call the object's member function with the data.
      (p_object->*p_function)(data);
    }

  private:

    TObject* p_object;                        
    void (TObject::* p_function)(TParameter); 
  };

  //***************************************************************************
  //***************************************************************************
  template <typename TObject>
  class function<TObject, void> : public ifunction<void>
  {
  public:

    //*************************************************************************
    //*************************************************************************
    function(TObject& object, void(TObject::* p_function)(void))
      : p_object(&object),
        p_function(p_function)
    {
    }

    //*************************************************************************
    //*************************************************************************
    virtual void operator ()()
    {
      // Call the object's member function.
      (p_object->*p_function)();
    }

  private:

    TObject* p_object;              
    void (TObject::* p_function)(); 
  };

  //***************************************************************************
  //***************************************************************************
  template <typename TParameter>
  class function<void, TParameter> : public ifunction<TParameter>
  {
  public:

    //*************************************************************************
    //*************************************************************************
    function(void(*p_function)(TParameter))
      : p_function(p_function)
    {
    }

    //*************************************************************************
    //*************************************************************************
    virtual void operator ()(TParameter data)
    {
      // Call the function with the data.
      (*p_function)(data);
    }

  private:

    void (*p_function)(TParameter); 
  };

  //***************************************************************************
  //***************************************************************************
  template <>
  class function<void, void> : public ifunction<void>
  {
  public:

    //*************************************************************************
    //*************************************************************************
    function(void(*p_function)(void))
      : p_function(p_function)
    {
    }

    //*************************************************************************
    //*************************************************************************
    virtual void operator ()()
    {
      // Call the function.
      (*p_function)();
    }

  private:

    void (*p_function)(); 
  };
}

#endif