3 * Abstract field operations
5 * (c) 2001 Straylight/Edgeware
8 /*----- Licensing notice --------------------------------------------------*
10 * This file is part of Catacomb.
12 * Catacomb is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU Library General Public License as
14 * published by the Free Software Foundation; either version 2 of the
15 * License, or (at your option) any later version.
17 * Catacomb is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU Library General Public License for more details.
22 * You should have received a copy of the GNU Library General Public
23 * License along with Catacomb; if not, write to the Free
24 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
28 /*----- Header files ------------------------------------------------------*/
33 /*----- Main code ---------------------------------------------------------*/
35 /* --- @field_id@ --- *
37 * Arguments: @field *f@ = pointer to a field
38 * @mp *d@ = a destination element
39 * @mp *x@ = a source element
41 * Returns: The result element.
43 * Use: An identity operation which can be used if your field has no
44 * internal representation.
47 mp *field_id(field *f, mp *d, mp *x)
48 { x = MP_COPY(x); if (d) MP_DROP(d); return (x); }
50 /* --- @field_samep@ --- *
52 * Arguments: @field *f, *g@ = two fields
54 * Returns: Nonzero if the fields are identical (not just isomorphic).
56 * Use: Checks for sameness of fields. This function does the full
57 * check, not just the field-type-specific check done by the
58 * @sampep@ field operation.
61 int field_samep(field *f, field *g)
62 { return (f == g || (f->ops == g->ops && F_SAMEP(f, g))); }
64 /* --- @field_stdsamep@ --- *
66 * Arguments: @field *f, *g@ = two fields
68 * Returns: Nonzero if the fields are identical (not just isomorphic).
70 * Use: Standard sameness check, based on equality of the @m@
74 int field_stdsamep(field *f, field *g) { return (MP_EQ(f->m, g->m)); }
76 /*----- That's all, folks -------------------------------------------------*/