/*** generics.h -- type invariant generic funs
 *
 * Copyright (C) 2012 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_generics_h_
#define INCLUDED_generics_h_

#if defined HAVE_CONFIG_H
# include "config.h"
#endif	/* HAVE_CONFIG_H */

#if defined __cplusplus
extern "C" {
#endif	/* __cplusplus */

/**
 * Compare two dates, yielding 0 if they are equal, -1 if D1 is older,
 * 1 if D1 is younger than the D2. */
#define dt_cmp(d1, d2)						\
	_Generic((d1),						\
		 struct dt_d_s: dt_dcmp,			\
		 struct dt_t_s: dt_tcmp,			\
		 struct dt_dt_s: dt_dtcmp,			\
		 default: NULL					\
		)(d1, d2)

/**
 * Check if D is in the interval spanned by D1 and D2,
 * 1 if D1 is younger than the D2. */
#define dt_in_range_p(d, d1, d2)					\
	_Generic((d1),							\
		 struct dt_d_s: dt_d_in_range_p,			\
		 struct dt_t_s: dt_t_in_range_p,			\
		 struct dt_dt_s: dt_dt_in_range_p,			\
		 default: NULL						\
		)(d, d1, d2)

#if defined __cplusplus
}
#endif	/* __cplusplus */

#endif	/* INCLUDED_generics_h_ */
