File: nifty.h

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/*** nifty.h -- generally handy macroes
 *
 * Copyright (C) 2009-2018 Sebastian Freundt
 *
 * Author:  Sebastian Freundt <freundt@ga-group.nl>
 *
 * This file is part of dateutils.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the author nor the names of any contributors
 *    may be used to endorse or promote products derived from this
 *    software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
 * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 ***/

#if !defined INCLUDED_nifty_h_
#define INCLUDED_nifty_h_

#if !defined LIKELY
# define LIKELY(_x)	__builtin_expect((_x), 1)
#endif	/* !LIKELY */
#if !defined UNLIKELY
# define UNLIKELY(_x)	__builtin_expect((_x), 0)
#endif	/* UNLIKELY */

#if !defined UNUSED
# define UNUSED(_x)	_x __attribute__((unused))
#endif	/* !UNUSED */

#if !defined ALGN
# define ALGN(_x, to)	_x __attribute__((aligned(to)))
#endif	/* !ALGN */

#if !defined countof
# define countof(x)	(sizeof(x) / sizeof(*x))
#endif	/* !countof */

#if !defined with
# define with(args...)	for (args, *__ep__ = (void*)1; __ep__; __ep__ = 0)
#endif	/* !with */

#endif	/* INCLUDED_nifty_h_ */