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