class.h
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/**
* \file
* My own class implementation for C. It combines a data structure
* with a set of dynamically linked methods defined by an interface. A
* dynamically linked method will be called via a selector method which in
* turn gets the implementation stored in the class.
*
* \author Georg Hopp
*
* \copyright
* Copyright (C) 2012 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 __CLASS_H__
#define __CLASS_H__
#include <stdarg.h>
#include <sys/types.h>
#include <string.h>
#include <assert.h>
#include "interface.h"
#ifndef _ISOC99_SOURCE
#define _ISOC99_SOURCE
#endif
#define CLASS_MAGIC 0xFEFE
#define CLASS(name) \
struct c_##name; \
typedef struct c_##name * name; \
extern struct class * const _##name; \
struct c_##name
#define EXTENDS(parent) \
const char _[sizeof(struct c_##parent)]
#define _NULL NULL
#define CREATE_CLASS(name,_parent,...) \
static struct class c_##name; \
static void _classInit_(void) { \
c_##name.parent = _##_parent; \
c_##name.init = NULL; \
} \
static struct class c_##name = { \
CLASS_MAGIC, \
NULL, \
sizeof(struct c_##name), \
_classInit_, \
INIT_IMPL(__VA_ARGS__) \
}; struct class * const _##name = &c_##name
#define GET_CLASS(object) (*(class_ptr *)((object) - sizeof(void*)))
#define IFACE_GET(class,iface) (interfaceGet(&((class)->impl),(iface)))
#define IFACE_EXISTS(class,iface) (NULL != IFACE_GET((class),(iface)))
/**
* \todo actually i use gcc feature ## for variadoc... think about
* a way to make this standard.
*/
#define _CALL(object,_iface,method,...) \
do { \
class_ptr class = GET_CLASS((object)); \
if (class->init) class->init(); \
iface = (struct i_##_iface *)IFACE_GET(class, &i_##_iface); \
while ((NULL == iface || NULL == iface->method) && HAS_PARENT(class)) { \
class = class->parent; \
if (class->init) class->init(); \
iface = (struct i_##_iface *)IFACE_GET(class, &i_##_iface); \
}; \
assert(NULL != iface->method); \
} while(0)
#define CALL(object,_iface,method,...) \
do { \
struct i_##_iface * iface; \
_CALL(object, _iface, method, ##__VA_ARGS__); \
iface->method(object, ##__VA_ARGS__); \
} while(0)
#define RETCALL(object,_iface,method,ret,...) \
do { \
struct i_##_iface * iface; \
_CALL(object, _iface, method, ##__VA_ARGS__); \
ret = iface->method(object, ##__VA_ARGS__); \
} while(0)
#define PARENTCALL(object,_iface,method,...) \
do { \
struct i_##_iface * iface; \
class_ptr class = GET_CLASS((object)); \
if (class->init) class->init(); \
assert(HAS_PARENT(class)); \
class = class->parent; \
if (class->init) class->init(); \
iface = (struct i_##_iface *)IFACE_GET(class, &i_##_iface); \
assert(NULL != iface->method); \
iface->method(object, ##__VA_ARGS__); \
} while(0)
#define HAS_PARENT(class) (NULL != ((class)->parent))
typedef void (* fptr_classInit)(void);
struct class;
typedef struct class * class_ptr;
struct class {
const int magic;
class_ptr parent;
size_t object_size;
fptr_classInit init;
struct iface_impl impl;
};
#endif // __CLASS_H__
// vim: set ts=4 sw=4: