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1 | /* -*-c-*- |
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2 | * |
3 | * Abstract field operations |
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4 | * |
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5 | * (c) 2001 Straylight/Edgeware |
6 | */ |
7 | |
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8 | /*----- Licensing notice --------------------------------------------------* |
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9 | * |
10 | * This file is part of Catacomb. |
11 | * |
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. |
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16 | * |
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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. |
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21 | * |
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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, |
25 | * MA 02111-1307, USA. |
26 | */ |
27 | |
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28 | /*----- Header files ------------------------------------------------------*/ |
29 | |
30 | #include "field.h" |
31 | #include "mp.h" |
32 | |
33 | /*----- Main code ---------------------------------------------------------*/ |
34 | |
35 | /* --- @field_id@ --- * |
36 | * |
37 | * Arguments: @field *f@ = pointer to a field |
38 | * @mp *d@ = a destination element |
39 | * @mp *x@ = a source element |
40 | * |
41 | * Returns: The result element. |
42 | * |
43 | * Use: An identity operation which can be used if your field has no |
44 | * internal representation. |
45 | */ |
46 | |
47 | mp *field_id(field *f, mp *d, mp *x) |
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48 | { x = MP_COPY(x); if (d) MP_DROP(d); return (x); } |
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49 | |
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50 | /* --- @field_samep@ --- * |
51 | * |
52 | * Arguments: @field *f, *g@ = two fields |
53 | * |
54 | * Returns: Nonzero if the fields are identical (not just isomorphic). |
55 | * |
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. |
59 | */ |
60 | |
61 | int field_samep(field *f, field *g) |
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62 | { return (f == g || (f->ops == g->ops && F_SAMEP(f, g))); } |
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63 | |
64 | /* --- @field_stdsamep@ --- * |
65 | * |
66 | * Arguments: @field *f, *g@ = two fields |
67 | * |
68 | * Returns: Nonzero if the fields are identical (not just isomorphic). |
69 | * |
70 | * Use: Standard sameness check, based on equality of the @m@ |
71 | * member. |
72 | */ |
73 | |
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74 | int field_stdsamep(field *f, field *g) { return (MP_EQ(f->m, g->m)); } |
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75 | |
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76 | /*----- That's all, folks -------------------------------------------------*/ |