/*
 * category: [data structure]
 * apply status: timerqueque
 * edit status:
 * build status:
 * description: object-oriented programming.
 */

#ifndef OOPUTIL_H
#define OOPUTIL_H

#pragma once

#include "memutil.h"

/** oop toolkit for c */

#define OOP_MEMBER(tbase)	__base__##tbase

#define OOP_EXTENDS(tbase)	struct tbase OOP_MEMBER(tbase)

//tderived is no used, return member of <derived_ptr> which type is <tclass> as pointer.
#define OOP_UPCAST(derived_ptr, tclass, tderived)	\
	(&(derived_ptr)->OOP_MEMBER(tclass))

// get <tderived> type object pointer from its member <base_ptr> which type is <tclass>
#define OOP_DOWNCAST(base_ptr, tclass, tderived)	\
	container_of(base_ptr, struct tderived, OOP_MEMBER(tclass))

#define OOP_INTERFACE(it)	struct it

#define OOP_INTERFACE_MEMBER(it) __vtbl__##it

// oop interface implementation
#define OOP_IMPLEMENTS(it)	struct it* OOP_INTERFACE_MEMBER(it)

//get the <tinterface> type member pointer which name is '__vtbl__<tinterface>'
#define OOP_INTERFACE_CAST(derived_ptr, tclass, tinterface)	\
	((devrived_ptr)->OOP_INTERFACE_MEMBER(tinterface))

#endif // OOPUTIL_H