objectmode

/*-
 * Copyright (c) 2012 valsorym <[email protected]>.
 * All rights reserved.
 *
 * Discussion on the forums.freebsd.org.
 *  url: http://forums.freebsd.org/showthread.php?p=177208
 */

/*
 * Class prototype, and new/delete emulation in OOD ANSI C.
 */

#ifndef OBJECTMODE_H
#define OBJECTMODE_H

#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>

/* NEW TYPES */
/* ************************************************************************* */
/*
 * Structure has size our future object, and it Constructor/Destructor
 * memory point.
 */
typedef struct {
    size_t size;
    void *(*create)(void *, va_list *);
    void *(*destroy)(void *);
} w_class;

/* INTERFACE */
/* ************************************************************************* */

/* IMPLEMENTATION */
/* ************************************************************************* */
/*
 * Function find constructor point our class, and initialize memory section for
 * it. Function has va_list arguments for initialization different objects.
 */
void
*new(w_class *class, ...)
{
    void *p = NULL;

    if (class && class->create) {
        /* Call constructor our future object. */
        va_list app;
        va_start(app, class);
        p = class->create(class, &app);
        va_end(app);
    }

    return p;
}

/*
 * Free memory sector, when lived our object.
 */
void
delete(void *obj)
{
    w_class **p = obj;

    if (obj && p && (*p)->destroy)
        obj = (*p)->destroy(obj);

    free(obj);
}

#endif

/* The End. */