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/**
* Useful macros.
*
* Author:
* Darin Adler <darin@bentspoon.com>
*
* Copyright 2001 Ben Tea Spoons, Inc.
*/
#ifndef _EGG_MACROS_H_
#define _EGG_MACROS_H_
#include <glib/gmacros.h>
G_BEGIN_DECLS
/* Macros for defining classes. Ideas taken from Nautilus and GOB. */
/* Define the boilerplate type stuff to reduce typos and code size. Defines
* the get_type method and the parent_class static variable. */
#define EGG_BOILERPLATE(type, type_as_function, corba_type, \
parent_type, parent_type_macro, \
register_type_macro) \
static void type_as_function ## _class_init (type ## Class *klass); \
static void type_as_function ## _instance_init (type *object); \
static parent_type ## Class *parent_class = NULL; \
static void \
type_as_function ## _class_init_trampoline (gpointer klass, \
gpointer data) \
{ \
parent_class = (parent_type ## Class *)g_type_class_ref ( \
parent_type_macro); \
type_as_function ## _class_init ((type ## Class *)klass); \
} \
GType \
type_as_function ## _get_type (void) \
{ \
static GType object_type = 0; \
if (object_type == 0) { \
static const GTypeInfo object_info = { \
sizeof (type ## Class), \
NULL, /* base_init */ \
NULL, /* base_finalize */ \
type_as_function ## _class_init_trampoline, \
NULL, /* class_finalize */ \
NULL, /* class_data */ \
sizeof (type), \
0, /* n_preallocs */ \
(GInstanceInitFunc) type_as_function ## _instance_init \
}; \
object_type = register_type_macro \
(type, type_as_function, corba_type, \
parent_type, parent_type_macro); \
} \
return object_type; \
}
/* Just call the parent handler. This assumes that there is a variable
* named parent_class that points to the (duh!) parent class. Note that
* this macro is not to be used with things that return something, use
* the _WITH_DEFAULT version for that */
#define EGG_CALL_PARENT(parent_class_cast, name, args) \
if (parent_class_cast(parent_class)->name != NULL) \
parent_class_cast(parent_class)->name args
/* Same as above, but in case there is no implementation, it evaluates
* to def_return */
#define EGG_CALL_PARENT_WITH_DEFAULT(parent_class_cast, \
name, args, def_return) \
((parent_class_cast(parent_class)->name != NULL) ? \
parent_class_cast(parent_class)->name args : def_return)
/* Call a virtual method */
#define EGG_CALL_VIRTUAL(object, get_class_cast, method, args) \
(get_class_cast (object)->method ? (* get_class_cast (object)->method) args : (void)0)
/* Call a virtual method with default */
#define EGG_CALL_VIRTUAL_WITH_DEFAULT(object, get_class_cast, method, args, default) \
(get_class_cast (object)->method ? (* get_class_cast (object)->method) args : default)
#define EGG_CLASS_BOILERPLATE(type, type_as_function, \
parent_type, parent_type_macro) \
EGG_BOILERPLATE(type, type_as_function, type, \
parent_type, parent_type_macro, \
EGG_REGISTER_TYPE)
#define EGG_REGISTER_TYPE(type, type_as_function, corba_type, \
parent_type, parent_type_macro) \
g_type_register_static (parent_type_macro, #type, &object_info, 0)
G_END_DECLS
#endif /* _EGG_MACROS_H_ */
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