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Diffstat (limited to 'src/libmowgli/object/class.h')
| -rw-r--r-- | src/libmowgli/object/class.h | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/src/libmowgli/object/class.h b/src/libmowgli/object/class.h new file mode 100644 index 0000000..9612aa4 --- /dev/null +++ b/src/libmowgli/object/class.h @@ -0,0 +1,60 @@ +/* + * libmowgli: A collection of useful routines for programming. + * class.h: Object class and type management, cast checking. + * + * Copyright (c) 2007 William Pitcock <nenolod -at- sacredspiral.co.uk> + * + * Permission to use, copy, modify, and/or distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice is present in all copies. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED + * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, + * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING + * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +#ifndef __MOWGLI_OBJECT_CLASS_H__ +#define __MOWGLI_OBJECT_CLASS_H__ + +typedef void (*mowgli_destructor_t)(void *); + +typedef struct { + char *name; + mowgli_list_t derivitives; + mowgli_destructor_t destructor; + mowgli_boolean_t dynamic; + mowgli_list_t message_handlers; +} mowgli_object_class_t; + +extern void mowgli_object_class_init(mowgli_object_class_t *klass, const char *name, mowgli_destructor_t des, mowgli_boolean_t dynamic); +extern int mowgli_object_class_check_cast(mowgli_object_class_t *klass1, mowgli_object_class_t *klass2); +extern void mowgli_object_class_set_derivitive(mowgli_object_class_t *klass, mowgli_object_class_t *parent); +extern void *mowgli_object_class_reinterpret_impl(/* mowgli_object_t */ void *object, mowgli_object_class_t *klass); +extern mowgli_object_class_t *mowgli_object_class_find_by_name(const char *name); +extern void mowgli_object_class_destroy(mowgli_object_class_t *klass); + +#define MOWGLI_REINTERPRET_CAST(object, klass) (klass *) mowgli_object_class_reinterpret_impl(object, mowgli_object_class_find_by_name( # klass )); + +#define mowgli_forced_cast(from_type, to_type, from, to)\ +do { \ + union cast_union \ + { \ + to_type out; \ + from_type in; \ + } u; \ + typedef int cant_use_union_cast[ \ + sizeof (from_type) == sizeof (u) \ + && sizeof (from_type) == sizeof (to_type) ? 1 : -1];\ + u.in = from; \ + to = u.out; \ +} while (0) + +#endif |