Null.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 "Null.h"
 
#define _Class _Null
 
#pragma mark - Object
 
static Object *copy(const Object *self) {
 
    return (Object *) self;
}
 
#pragma mark - Null
 
static Null *_null;
 
static Null *null(void) {
 
    static Once once;
 
    do_once(&once, {
        _null = (Null *) $((Object *) alloc(Null), init);
    });
 
    return _null;
}
 
#pragma mark - Class lifecycle
 
static void initialize(Class *clazz) {
 
    ((ObjectInterface *) clazz->interface)->copy = copy;
 
    ((NullInterface *) clazz->interface)->null = null;
}
 
static void destroy(Class *clazz) {
 
    release(_null);
}
 
Class *_Null(void) {
    static Class *clazz;
    static Once once;
 
    do_once(&once, {
        clazz = _initialize(&(const ClassDef) {
            .name = "Null",
            .superclass = _Object(),
            .instanceSize = sizeof(Null),
            .interfaceOffset = offsetof(Null, interface),
            .interfaceSize = sizeof(NullInterface),
            .initialize = initialize,
            .destroy = destroy,
        });
    });
 
    return clazz;
}
 
#undef _Class