Property.hpp

//-- Property.hpp --

/*--------------------------------------------------------------------------
						 Class Library

	 Copyrights Emad Barsoum (ebarsoum@msn.com) 2003. All rights reserved.
	 ________________________________________________________________


	 PROJECT   : General
	 MODULE    : property
	 FILENAME  : Property.hpp
	   BUILD     : 1

	 History of Modifications:

	 Date(dd/mm/yyyy)Person                Description
	 ----            ------                -----------
	 25/03/2003      Emad Barsoum          Initial design and coding

	 CLASS NAME: property
	 VERSION: 1.0

	 DESCRIPTION:
		This class try to simulate property for C++, using template technique.

	 LICENSE:
		You are free to change or modify or redistribute the code, just keep the
   header. And you can use this class in any application you want without any
   warranty.
*/
#include <assert.h>
#include <stdlib.h>
#if !defined INC_PROPERTY_HPP
#define INC_PROPERTY_HPP

#define READ_ONLY 1
#define WRITE_ONLY 2
#define READ_WRITE 3

template <typename Container, typename ValueType, int nPropType>
class property {
  public:
	property() {
		m_cObject = NULL;
		Set = NULL;
		Get = NULL;
	}
	//-- This to set a pointer to the class that contain the property --
	void setContainer(Container *cObject) {
		m_cObject = cObject;
	}
	//-- Set the set member function that will change the value --
	void setter(void (Container::*pSet)(ValueType value)) {
		if ((nPropType == WRITE_ONLY) || (nPropType == READ_WRITE))
			Set = pSet;
		else
			Set = NULL;
	}
	//-- Set the get member function that will retrieve the value --
	void getter(ValueType (Container::*pGet)()) {
		if ((nPropType == READ_ONLY) || (nPropType == READ_WRITE))
			Get = pGet;
		else
			Get = NULL;
	}
	//-- Overload the '=' sign to set the value using the set member --
	ValueType operator=(const ValueType &value) {
		assert(m_cObject != NULL);
		assert(Set != NULL);
		(m_cObject->*Set)(value);
		return value;
	}

	//-- To make possible to cast the property class to the internal type --
	operator ValueType() {
		assert(m_cObject != NULL);
		assert(Get != NULL);
		return (m_cObject->*Get)();
	}

  private:
	Container
			*m_cObject; //-- Pointer to the module that contain the property --
	void (Container::*Set)(
			ValueType value); //-- Pointer to set member function --
	ValueType (Container::*Get)(); //-- Pointer to get member function --
};

#endif