Add an internal-representation no-op function.

[u/mdw/catacomb] / field.c

/* -*-c-*-
 *
 * $Id: field.c,v 1.1 2001/05/07 17:30:13 mdw Exp $
 *
 * [Abstract field operations *
 * (c) 2001 Straylight/Edgeware
 */

/*----- Licensing notice --------------------------------------------------* 
 *
 * This file is part of Catacomb.
 *
 * Catacomb is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Library General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 * 
 * Catacomb is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Library General Public License for more details.
 * 
 * You should have received a copy of the GNU Library General Public
 * License along with Catacomb; if not, write to the Free
 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
 * MA 02111-1307, USA.
 */

/*----- Revision history --------------------------------------------------* 
 *
 * $Log: field.c,v $
 * Revision 1.1  2001/05/07 17:30:13  mdw
 * Add an internal-representation no-op function.
 *
 */

/*----- Header files ------------------------------------------------------*/

#include "field.h"
#include "mp.h"

/*----- Main code ---------------------------------------------------------*/

/* --- @field_id@ --- *
 *
 * Arguments:	@field *f@ = pointer to a field
 *		@mp *d@ = a destination element
 *		@mp *x@ = a source element
 *
 * Returns:	The result element.
 *
 * Use:		An identity operation which can be used if your field has no
 *		internal representation.
 */

mp *field_id(field *f, mp *d, mp *x)
{
  x = MP_COPY(x);
  if (d) MP_DROP(d);
  return (x);
}

/*----- That's all, folks -------------------------------------------------*/