Object.c

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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.
 */
 
#include <assert.h>
#include <stdlib.h>
#include <string.h>
 
#include "Object.h"
#include "String.h"
 
#define _Class _Object
 
#pragma mark - Object
 
static Object *copy(const Object *self) {
 
  ident obj = calloc(1, self->clazz->def.instanceSize);
  assert(obj);
 
  Object *object = memcpy(obj, self, self->clazz->def.instanceSize);
  object->referenceCount = 1;
 
  return object;
}
 
static void dealloc(Object *self) {
 
  free(self);
}
 
static String *description(const Object *self) {
 
  return $(alloc(String), initWithFormat, "%s@%p", self->clazz->def.name, self);
}
 
static int hash(const Object *self) {
 
  uintptr_t addr = (uintptr_t) self;
 
  return (int) ((13 * addr) ^ (addr >> 15));
}
 
static Object *init(Object *self) {
 
  return self;
}
 
static bool isEqual(const Object *self, const Object *other) {
 
  return self == other;
}
 
static bool isKindOfClass(const Object *self, const Class *clazz) {
 
  assert(clazz);
  
  const Class *c = self->clazz;
  while (c) {
    if (memcmp(c, clazz, sizeof(*c)) == 0) {
      return true;
    }
    c = c->def.superclass;
  }
 
  return false;
}
 
#pragma mark - Class lifecycle
 
static void initialize(Class *clazz) {
 
  ((ObjectInterface *) clazz->interface)->copy = copy;
  ((ObjectInterface *) clazz->interface)->dealloc = dealloc;
  ((ObjectInterface *) clazz->interface)->description = description;
  ((ObjectInterface *) clazz->interface)->hash = hash;
  ((ObjectInterface *) clazz->interface)->init = init;
  ((ObjectInterface *) clazz->interface)->isEqual = isEqual;
  ((ObjectInterface *) clazz->interface)->isKindOfClass = isKindOfClass;
}
 
Class *_Object(void) {
  static Class *clazz;
  static Once once;
 
  do_once(&once, {
    clazz = _initialize(&(const ClassDef) {
      .name = "Object",
      .instanceSize = sizeof(Object),
      .interfaceOffset = offsetof(Object, interface),
      .interfaceSize = sizeof(ObjectInterface),
      .initialize = initialize,
    });
  });
 
  return clazz;
}
 
#undef _Class