/*
 * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017
 *   Jonathan Schleifer <js@heap.zone>
 *
 * All rights reserved.
 *
 * This file is part of ObjFW. It may be distributed under the terms of the
 * Q Public License 1.0, which can be found in the file LICENSE.QPL included in
 * the packaging of this file.
 *
 * Alternatively, it may be distributed under the terms of the GNU General
 * Public License, either version 2 or 3, which can be found in the file
 * LICENSE.GPLv2 or LICENSE.GPLv3 respectively included in the packaging of this
 * file.
 */

#import "OFObject.h"
#import "OFSerialization.h"
#import "OFJSONRepresentation.h"
#import "OFMessagePackRepresentation.h"

OF_ASSUME_NONNULL_BEGIN

/*!
 * @class OFNull OFNull.h ObjFW/OFNull.h
 *
 * @brief A class for representing null values in collections.
 */
OF_SUBCLASSING_RESTRICTED
@interface OFNull: OFObject <OFCopying, OFSerialization, OFJSONRepresentation,
    OFMessagePackRepresentation>
/*!
 * @brief Returns an OFNull singleton.
 *
 * @return An OFNull singleton
 */
+ (OFNull *)null;
@end

OF_ASSUME_NONNULL_END
