1 /*** category.c -- categorial view on objects, this is NOT OO
3 * Copyright (C) 2008 Sebastian Freundt
5 * Author: Sebastian Freundt <hroptatyr@sxemacs.org>
7 * This file is part of SXEmacs.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the author nor the names of any contributors
21 * may be used to endorse or promote products derived from this
22 * software without specific prior written permission.
24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR
25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
26 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
27 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
31 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
32 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
33 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
34 * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
43 struct cat_morphism_s __morphisms[lrecord_type_last_built_in_type];
44 cat_morphism_t morphisms = __morphisms;
48 cat_morphisms(const void *obj)
50 /* returns a pointer to the array of implementations or
51 * NULL if there are none */
52 if (((const struct lrecord_header*)obj)->morphisms & cat_mk_lc) {
53 return &((const struct __cat_morphism_lcrec_s*)obj)->foo;
55 return &((const struct __cat_morphism_lrec_s*)obj)->foo;
60 cat_morphism(const void *obj, cat_morphism_kind_t kind)
62 unsigned int flags = ((const struct lrecord_header*)obj)->morphisms;
64 if (!__bit_set_p(flags, kind)) {
65 int type = ((const struct lrecord_header*)obj)->type;
68 GC_CRITICAL("here %x %x\n", flags, kind);
69 return morphisms[type].seq_impl;
71 return morphisms[type].set_impl;
73 return morphisms[type].aseq_impl;
75 return morphisms[type].aset_impl;
80 void *const*mph = cat_morphisms(obj);
81 return mph[__nbits_right_of(flags, kind)-(flags&1)];
86 /* category.c ends here */