class.h
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/**
* \file
* Interface for class handling. Defines new, delete and clone selectors
* which in turn use the ctor, dtor and clone implementation from the
* class implementation.
*
* \author Georg Hopp
*
* \copyright
* Copyright © 2012-2013 Georg Hopp
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __TR_CLASS_INTERFACE_CLASS_H__
#define __TR_CLASS_INTERFACE_CLASS_H__
#include <stdarg.h>
#include "tr/class.h"
#include "tr/interface.h"
typedef int (* fptr_ctor)(void *, va_list *);
typedef void (* fptr_dtor)(void *);
typedef void (* fptr_clone)(void *, void * const);
/**
* The interface structure for the class interface.
* Each class that implements this interface (and that
* should be all classes) need to provide at least
* a funtion pointer for the fptr_ctor. Else no
* instances can be created.
*/
TR_INTERFACE(TR_Class) {
TR_IFID;
fptr_ctor ctor;
fptr_dtor dtor;
fptr_clone clone;
};
/**
* Interface caller function for i_class::ctor.
* This one will never be called direcly but only through
* TR_new.
*
* \see TR_classNewv
* \see TR_new
*
* \cond PRIVATE
*/
void * TR_classNew(TR_class_ptr, ...);
/**
* This is another caller function for i_class:ctor but
* this uses a va_list for the argument to the constructor
* instead of an ellipse.
* Again this will only be called through TR_newv.
*
* \see TR_newv
*/
void * TR_classNewv(TR_class_ptr, va_list *);
/**
* Interface caller function for i_class::dtor.
* Never called directly.
*
* \see TR_delete
*/
void TR_classDelete(void **);
/**
* Interface caller function for i_class::clone
* Never called directly.
*
* \see TR_delete
*/
void * TR_classClone(void *);
/** \endcond */
/**
* Create an instance of a class by calling its constructor
* implementation after initialization and memory allocation
* of the class itself.
*/
#define TR_new(class,...) TR_classNew(_##class, ##__VA_ARGS__)
/**
* Create an instance of a class by calling its constructor
* implementation but this time with a va_list instead of a
* variable amount of arguments.
*/
#define TR_newv(class,args) TR_classNewv(_##class, args)
/**
* Destroy an instance by first calling its destructor and then
* free all other memory.
*/
#define TR_delete(object) TR_classDelete((void **)&(object))
/**
* Create a clone of an instance by calling its clone implementation.
* A simple memcopy is often not enough because the cloned instance
* might have to allocate ist own resources or reuse resources in
* a given way.
*/
#define TR_clone(object) TR_classClone((void *)(object))
#endif // __TR_CLASS_INTERFACE_CLASS_H__
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