X-Git-Url: https://git.distorted.org.uk/u/mdw/catacomb/blobdiff_plain/2685767a6125c1620719c7de6234aedf41857b7e..e564e3f84ad0ea42b78559c0bfe304893fd5e76b:/field.c

diff --git a/field.c b/field.c
index c7e7559..8fb1ad6 100644
--- a/field.c
+++ b/field.c
@@ -1,12 +1,13 @@
 /* -*-c-*-
  *
- * $Id: field.c,v 1.1 2001/05/07 17:30:13 mdw Exp $
+ * $Id$
+ *
+ * Abstract field operations
  *
- * [Abstract field operations *
  * (c) 2001 Straylight/Edgeware
  */
 
-/*----- Licensing notice --------------------------------------------------* 
+/*----- Licensing notice --------------------------------------------------*
  *
  * This file is part of Catacomb.
  *
@@ -14,26 +15,18 @@
  * 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"
@@ -54,10 +47,32 @@
  */
 
 mp *field_id(field *f, mp *d, mp *x)
-{
-  x = MP_COPY(x);
-  if (d) MP_DROP(d);
-  return (x);
-}
+  { x = MP_COPY(x); if (d) MP_DROP(d); return (x); }
+
+/* --- @field_samep@ --- *
+ *
+ * Arguments:	@field *f, *g@ = two fields
+ *
+ * Returns:	Nonzero if the fields are identical (not just isomorphic).
+ *
+ * Use:		Checks for sameness of fields.  This function does the full
+ *		check, not just the field-type-specific check done by the
+ *		@sampep@ field operation.
+ */
+
+int field_samep(field *f, field *g)
+  { return (f == g || (f->ops == g->ops && F_SAMEP(f, g))); }
+
+/* --- @field_stdsamep@ --- *
+ *
+ * Arguments:	@field *f, *g@ = two fields
+ *
+ * Returns:	Nonzero if the fields are identical (not just isomorphic).
+ *
+ * Use:		Standard sameness check, based on equality of the @m@
+ *		member.
+ */
+
+int field_stdsamep(field *f, field *g) { return (MP_EQ(f->m, g->m)); }
 
 /*----- That's all, folks -------------------------------------------------*/