Class.h

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/*
 * Objectively: Ultra-lightweight object oriented framework for GNU C.
 * Copyright (C) 2014 Jay Dolan <jay@jaydolan.com>
 *
 * This software is provided 'as-is', without any express or implied
 * warranty. In no event will the authors be held liable for any damages
 * arising from the use of this software.
 *
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute it
 * freely, subject to the following restrictions:
 *
 * 1. The origin of this software must not be misrepresented; you must not
 * claim that you wrote the original software. If you use this software
 * in a product, an acknowledgment in the product documentation would be
 * appreciated but is not required.
 *
 * 2. Altered source versions must be plainly marked as such, and must not be
 * misrepresented as being the original software.
 *
 * 3. This notice may not be removed or altered from any source distribution.
 */
 
#pragma once
 
#include <Objectively/Types.h>
#include <Objectively/Once.h>
 
typedef struct ClassDef ClassDef;
typedef struct Class Class;
 
struct ClassDef {
 
  void (*destroy)(Class *clazz);
 
  void (*initialize)(Class *clazz);
 
  size_t instanceSize;
 
  ptrdiff_t interfaceOffset;
 
  size_t interfaceSize;
 
  const char *name;
 
  Class *superclass;
};
 
struct Class {
 
  ClassDef def;
 
  ident interface;
 
  Class *next;
};
 
OBJECTIVELY_EXPORT Class* _initialize(const ClassDef *clazz);
 
OBJECTIVELY_EXPORT ident _alloc(Class *clazz);
 
OBJECTIVELY_EXPORT ident _cast(const Class *clazz, const ident obj);
 
OBJECTIVELY_EXPORT Class *classForName(const char *name);
 
OBJECTIVELY_EXPORT ident release(ident obj);
 
OBJECTIVELY_EXPORT ident retain(ident obj);
 
OBJECTIVELY_EXPORT size_t _pageSize;
 
#define OBJECTIVELY_MAGIC 0xdeadbeef
 
#define isobject(obj) \
  (obj && *((unsigned int *) obj) == OBJECTIVELY_MAGIC)
 
#define instanceof(type, obj) \
  (isobject(obj) && $((Object *) obj, isKindOfClass, _##type()))
 
#define alloc(type) \
  ((type *) _alloc(_##type()))
 
#define cast(type, obj) \
  ((type *) _cast(_##type(), (const ident) obj))
 
#define classof(obj) \
  ((Object *) obj)->clazz
 
#define classnameof(obj) \
  classof(obj)->def.name
 
#define interfaceof(type, clazz) \
  ((type##Interface *) (clazz)->interface)
 
#define $(obj, method, ...) \
  ({ \
    typeof(obj) _obj = obj; \
    _obj->interface->method(_obj, ## __VA_ARGS__); \
  })
 
#define $$(type, method, ...) \
  ({ \
    interfaceof(type, _##type())->method(__VA_ARGS__); \
  })
 
#define super(type, obj, method, ...) \
  interfaceof(type, _Class()->def.superclass)->method(cast(type, obj), ## __VA_ARGS__)