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1 office 1 /* GObject - GLib Type, Object, Parameter and Signal Library
2 * Copyright (C) 1998-1999, 2000-2001 Tim Janik and Red Hat, Inc.
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General
15 * Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
16 */
17 #ifndef __G_OBJECT_H__
18 #define __G_OBJECT_H__
19  
20 #if !defined (__GLIB_GOBJECT_H_INSIDE__) && !defined (GOBJECT_COMPILATION)
21 #error "Only <glib-object.h> can be included directly."
22 #endif
23  
24 #include <gobject/gtype.h>
25 #include <gobject/gvalue.h>
26 #include <gobject/gparam.h>
27 #include <gobject/gclosure.h>
28 #include <gobject/gsignal.h>
29 #include <gobject/gboxed.h>
30  
31 G_BEGIN_DECLS
32  
33 /* --- type macros --- */
34 /**
35 * G_TYPE_IS_OBJECT:
36 * @type: Type id to check
37 *
38 * Check if the passed in type id is a %G_TYPE_OBJECT or derived from it.
39 *
40 * Returns: %FALSE or %TRUE, indicating whether @type is a %G_TYPE_OBJECT.
41 */
42 #define G_TYPE_IS_OBJECT(type) (G_TYPE_FUNDAMENTAL (type) == G_TYPE_OBJECT)
43 /**
44 * G_OBJECT:
45 * @object: Object which is subject to casting.
46 *
47 * Casts a #GObject or derived pointer into a (GObject*) pointer.
48 * Depending on the current debugging level, this function may invoke
49 * certain runtime checks to identify invalid casts.
50 */
51 #define G_OBJECT(object) (G_TYPE_CHECK_INSTANCE_CAST ((object), G_TYPE_OBJECT, GObject))
52 /**
53 * G_OBJECT_CLASS:
54 * @class: a valid #GObjectClass
55 *
56 * Casts a derived #GObjectClass structure into a #GObjectClass structure.
57 */
58 #define G_OBJECT_CLASS(class) (G_TYPE_CHECK_CLASS_CAST ((class), G_TYPE_OBJECT, GObjectClass))
59 /**
60 * G_IS_OBJECT:
61 * @object: Instance to check for being a %G_TYPE_OBJECT.
62 *
63 * Checks whether a valid #GTypeInstance pointer is of type %G_TYPE_OBJECT.
64 */
65 #if GLIB_VERSION_MAX_ALLOWED >= GLIB_VERSION_2_42
66 #define G_IS_OBJECT(object) (G_TYPE_CHECK_INSTANCE_FUNDAMENTAL_TYPE ((object), G_TYPE_OBJECT))
67 #else
68 #define G_IS_OBJECT(object) (G_TYPE_CHECK_INSTANCE_TYPE ((object), G_TYPE_OBJECT))
69 #endif
70 /**
71 * G_IS_OBJECT_CLASS:
72 * @class: a #GObjectClass
73 *
74 * Checks whether @class "is a" valid #GObjectClass structure of type
75 * %G_TYPE_OBJECT or derived.
76 */
77 #define G_IS_OBJECT_CLASS(class) (G_TYPE_CHECK_CLASS_TYPE ((class), G_TYPE_OBJECT))
78 /**
79 * G_OBJECT_GET_CLASS:
80 * @object: a #GObject instance.
81 *
82 * Get the class structure associated to a #GObject instance.
83 *
84 * Returns: pointer to object class structure.
85 */
86 #define G_OBJECT_GET_CLASS(object) (G_TYPE_INSTANCE_GET_CLASS ((object), G_TYPE_OBJECT, GObjectClass))
87 /**
88 * G_OBJECT_TYPE:
89 * @object: Object to return the type id for.
90 *
91 * Get the type id of an object.
92 *
93 * Returns: Type id of @object.
94 */
95 #define G_OBJECT_TYPE(object) (G_TYPE_FROM_INSTANCE (object))
96 /**
97 * G_OBJECT_TYPE_NAME:
98 * @object: Object to return the type name for.
99 *
100 * Get the name of an object's type.
101 *
102 * Returns: Type name of @object. The string is owned by the type system and
103 * should not be freed.
104 */
105 #define G_OBJECT_TYPE_NAME(object) (g_type_name (G_OBJECT_TYPE (object)))
106 /**
107 * G_OBJECT_CLASS_TYPE:
108 * @class: a valid #GObjectClass
109 *
110 * Get the type id of a class structure.
111 *
112 * Returns: Type id of @class.
113 */
114 #define G_OBJECT_CLASS_TYPE(class) (G_TYPE_FROM_CLASS (class))
115 /**
116 * G_OBJECT_CLASS_NAME:
117 * @class: a valid #GObjectClass
118 *
119 * Return the name of a class structure's type.
120 *
121 * Returns: Type name of @class. The string is owned by the type system and
122 * should not be freed.
123 */
124 #define G_OBJECT_CLASS_NAME(class) (g_type_name (G_OBJECT_CLASS_TYPE (class)))
125 /**
126 * G_VALUE_HOLDS_OBJECT:
127 * @value: a valid #GValue structure
128 *
129 * Checks whether the given #GValue can hold values derived from type %G_TYPE_OBJECT.
130 *
131 * Returns: %TRUE on success.
132 */
133 #define G_VALUE_HOLDS_OBJECT(value) (G_TYPE_CHECK_VALUE_TYPE ((value), G_TYPE_OBJECT))
134  
135 /* --- type macros --- */
136 /**
137 * G_TYPE_INITIALLY_UNOWNED:
138 *
139 * The type for #GInitiallyUnowned.
140 */
141 #define G_TYPE_INITIALLY_UNOWNED (g_initially_unowned_get_type())
142 /**
143 * G_INITIALLY_UNOWNED:
144 * @object: Object which is subject to casting.
145 *
146 * Casts a #GInitiallyUnowned or derived pointer into a (GInitiallyUnowned*)
147 * pointer. Depending on the current debugging level, this function may invoke
148 * certain runtime checks to identify invalid casts.
149 */
150 #define G_INITIALLY_UNOWNED(object) (G_TYPE_CHECK_INSTANCE_CAST ((object), G_TYPE_INITIALLY_UNOWNED, GInitiallyUnowned))
151 /**
152 * G_INITIALLY_UNOWNED_CLASS:
153 * @class: a valid #GInitiallyUnownedClass
154 *
155 * Casts a derived #GInitiallyUnownedClass structure into a
156 * #GInitiallyUnownedClass structure.
157 */
158 #define G_INITIALLY_UNOWNED_CLASS(class) (G_TYPE_CHECK_CLASS_CAST ((class), G_TYPE_INITIALLY_UNOWNED, GInitiallyUnownedClass))
159 /**
160 * G_IS_INITIALLY_UNOWNED:
161 * @object: Instance to check for being a %G_TYPE_INITIALLY_UNOWNED.
162 *
163 * Checks whether a valid #GTypeInstance pointer is of type %G_TYPE_INITIALLY_UNOWNED.
164 */
165 #define G_IS_INITIALLY_UNOWNED(object) (G_TYPE_CHECK_INSTANCE_TYPE ((object), G_TYPE_INITIALLY_UNOWNED))
166 /**
167 * G_IS_INITIALLY_UNOWNED_CLASS:
168 * @class: a #GInitiallyUnownedClass
169 *
170 * Checks whether @class "is a" valid #GInitiallyUnownedClass structure of type
171 * %G_TYPE_INITIALLY_UNOWNED or derived.
172 */
173 #define G_IS_INITIALLY_UNOWNED_CLASS(class) (G_TYPE_CHECK_CLASS_TYPE ((class), G_TYPE_INITIALLY_UNOWNED))
174 /**
175 * G_INITIALLY_UNOWNED_GET_CLASS:
176 * @object: a #GInitiallyUnowned instance.
177 *
178 * Get the class structure associated to a #GInitiallyUnowned instance.
179 *
180 * Returns: pointer to object class structure.
181 */
182 #define G_INITIALLY_UNOWNED_GET_CLASS(object) (G_TYPE_INSTANCE_GET_CLASS ((object), G_TYPE_INITIALLY_UNOWNED, GInitiallyUnownedClass))
183 /* GInitiallyUnowned ia a GObject with initially floating reference count */
184  
185  
186 /* --- typedefs & structures --- */
187 typedef struct _GObject GObject;
188 typedef struct _GObjectClass GObjectClass;
189 typedef struct _GObject GInitiallyUnowned;
190 typedef struct _GObjectClass GInitiallyUnownedClass;
191 typedef struct _GObjectConstructParam GObjectConstructParam;
192 /**
193 * GObjectGetPropertyFunc:
194 * @object: a #GObject
195 * @property_id: the numeric id under which the property was registered with
196 * g_object_class_install_property().
197 * @value: a #GValue to return the property value in
198 * @pspec: the #GParamSpec describing the property
199 *
200 * The type of the @get_property function of #GObjectClass.
201 */
202 typedef void (*GObjectGetPropertyFunc) (GObject *object,
203 guint property_id,
204 GValue *value,
205 GParamSpec *pspec);
206 /**
207 * GObjectSetPropertyFunc:
208 * @object: a #GObject
209 * @property_id: the numeric id under which the property was registered with
210 * g_object_class_install_property().
211 * @value: the new value for the property
212 * @pspec: the #GParamSpec describing the property
213 *
214 * The type of the @set_property function of #GObjectClass.
215 */
216 typedef void (*GObjectSetPropertyFunc) (GObject *object,
217 guint property_id,
218 const GValue *value,
219 GParamSpec *pspec);
220 /**
221 * GObjectFinalizeFunc:
222 * @object: the #GObject being finalized
223 *
224 * The type of the @finalize function of #GObjectClass.
225 */
226 typedef void (*GObjectFinalizeFunc) (GObject *object);
227 /**
228 * GWeakNotify:
229 * @data: data that was provided when the weak reference was established
230 * @where_the_object_was: the object being finalized
231 *
232 * A #GWeakNotify function can be added to an object as a callback that gets
233 * triggered when the object is finalized. Since the object is already being
234 * finalized when the #GWeakNotify is called, there's not much you could do
235 * with the object, apart from e.g. using its address as hash-index or the like.
236 */
237 typedef void (*GWeakNotify) (gpointer data,
238 GObject *where_the_object_was);
239 /**
240 * GObject:
241 *
242 * All the fields in the GObject structure are private
243 * to the #GObject implementation and should never be accessed directly.
244 */
245 struct _GObject
246 {
247 GTypeInstance g_type_instance;
248  
249 /*< private >*/
250 volatile guint ref_count;
251 GData *qdata;
252 };
253 /**
254 * GObjectClass:
255 * @g_type_class: the parent class
256 * @constructor: the @constructor function is called by g_object_new () to
257 * complete the object initialization after all the construction properties are
258 * set. The first thing a @constructor implementation must do is chain up to the
259 * @constructor of the parent class. Overriding @constructor should be rarely
260 * needed, e.g. to handle construct properties, or to implement singletons.
261 * @set_property: the generic setter for all properties of this type. Should be
262 * overridden for every type with properties. If implementations of
263 * @set_property don't emit property change notification explicitly, this will
264 * be done implicitly by the type system. However, if the notify signal is
265 * emitted explicitly, the type system will not emit it a second time.
266 * @get_property: the generic getter for all properties of this type. Should be
267 * overridden for every type with properties.
268 * @dispose: the @dispose function is supposed to drop all references to other
269 * objects, but keep the instance otherwise intact, so that client method
270 * invocations still work. It may be run multiple times (due to reference
271 * loops). Before returning, @dispose should chain up to the @dispose method
272 * of the parent class.
273 * @finalize: instance finalization function, should finish the finalization of
274 * the instance begun in @dispose and chain up to the @finalize method of the
275 * parent class.
276 * @dispatch_properties_changed: emits property change notification for a bunch
277 * of properties. Overriding @dispatch_properties_changed should be rarely
278 * needed.
279 * @notify: the class closure for the notify signal
280 * @constructed: the @constructed function is called by g_object_new() as the
281 * final step of the object creation process. At the point of the call, all
282 * construction properties have been set on the object. The purpose of this
283 * call is to allow for object initialisation steps that can only be performed
284 * after construction properties have been set. @constructed implementors
285 * should chain up to the @constructed call of their parent class to allow it
286 * to complete its initialisation.
287 *
288 * The class structure for the GObject type.
289 *
290 * <example>
291 * <title>Implementing singletons using a constructor</title>
292 * <programlisting>
293 * static MySingleton *the_singleton = NULL;
294 *
295 * static GObject*
296 * my_singleton_constructor (GType type,
297 * guint n_construct_params,
298 * GObjectConstructParam *construct_params)
299 * {
300 * GObject *object;
301 *
302 * if (!the_singleton)
303 * {
304 * object = G_OBJECT_CLASS (parent_class)->constructor (type,
305 * n_construct_params,
306 * construct_params);
307 * the_singleton = MY_SINGLETON (object);
308 * }
309 * else
310 * object = g_object_ref (G_OBJECT (the_singleton));
311 *
312 * return object;
313 * }
314 * </programlisting></example>
315 */
316 struct _GObjectClass
317 {
318 GTypeClass g_type_class;
319  
320 /*< private >*/
321 GSList *construct_properties;
322  
323 /*< public >*/
324 /* seldom overidden */
325 GObject* (*constructor) (GType type,
326 guint n_construct_properties,
327 GObjectConstructParam *construct_properties);
328 /* overridable methods */
329 void (*set_property) (GObject *object,
330 guint property_id,
331 const GValue *value,
332 GParamSpec *pspec);
333 void (*get_property) (GObject *object,
334 guint property_id,
335 GValue *value,
336 GParamSpec *pspec);
337 void (*dispose) (GObject *object);
338 void (*finalize) (GObject *object);
339 /* seldom overidden */
340 void (*dispatch_properties_changed) (GObject *object,
341 guint n_pspecs,
342 GParamSpec **pspecs);
343 /* signals */
344 void (*notify) (GObject *object,
345 GParamSpec *pspec);
346  
347 /* called when done constructing */
348 void (*constructed) (GObject *object);
349  
350 /*< private >*/
351 gsize flags;
352  
353 /* padding */
354 gpointer pdummy[6];
355 };
356 /**
357 * GObjectConstructParam:
358 * @pspec: the #GParamSpec of the construct parameter
359 * @value: the value to set the parameter to
360 *
361 * The GObjectConstructParam struct is an auxiliary
362 * structure used to hand #GParamSpec/#GValue pairs to the @constructor of
363 * a #GObjectClass.
364 */
365 struct _GObjectConstructParam
366 {
367 GParamSpec *pspec;
368 GValue *value;
369 };
370  
371 /**
372 * GInitiallyUnowned:
373 *
374 * All the fields in the GInitiallyUnowned structure
375 * are private to the #GInitiallyUnowned implementation and should never be
376 * accessed directly.
377 */
378 /**
379 * GInitiallyUnownedClass:
380 *
381 * The class structure for the GInitiallyUnowned type.
382 */
383  
384  
385 /* --- prototypes --- */
386 GLIB_AVAILABLE_IN_ALL
387 GType g_initially_unowned_get_type (void);
388 GLIB_AVAILABLE_IN_ALL
389 void g_object_class_install_property (GObjectClass *oclass,
390 guint property_id,
391 GParamSpec *pspec);
392 GLIB_AVAILABLE_IN_ALL
393 GParamSpec* g_object_class_find_property (GObjectClass *oclass,
394 const gchar *property_name);
395 GLIB_AVAILABLE_IN_ALL
396 GParamSpec**g_object_class_list_properties (GObjectClass *oclass,
397 guint *n_properties);
398 GLIB_AVAILABLE_IN_ALL
399 void g_object_class_override_property (GObjectClass *oclass,
400 guint property_id,
401 const gchar *name);
402 GLIB_AVAILABLE_IN_ALL
403 void g_object_class_install_properties (GObjectClass *oclass,
404 guint n_pspecs,
405 GParamSpec **pspecs);
406  
407 GLIB_AVAILABLE_IN_ALL
408 void g_object_interface_install_property (gpointer g_iface,
409 GParamSpec *pspec);
410 GLIB_AVAILABLE_IN_ALL
411 GParamSpec* g_object_interface_find_property (gpointer g_iface,
412 const gchar *property_name);
413 GLIB_AVAILABLE_IN_ALL
414 GParamSpec**g_object_interface_list_properties (gpointer g_iface,
415 guint *n_properties_p);
416  
417 GLIB_AVAILABLE_IN_ALL
418 GType g_object_get_type (void) G_GNUC_CONST;
419 GLIB_AVAILABLE_IN_ALL
420 gpointer g_object_new (GType object_type,
421 const gchar *first_property_name,
422 ...);
423 GLIB_AVAILABLE_IN_ALL
424 gpointer g_object_newv (GType object_type,
425 guint n_parameters,
426 GParameter *parameters);
427 GLIB_AVAILABLE_IN_ALL
428 GObject* g_object_new_valist (GType object_type,
429 const gchar *first_property_name,
430 va_list var_args);
431 GLIB_AVAILABLE_IN_ALL
432 void g_object_set (gpointer object,
433 const gchar *first_property_name,
434 ...) G_GNUC_NULL_TERMINATED;
435 GLIB_AVAILABLE_IN_ALL
436 void g_object_get (gpointer object,
437 const gchar *first_property_name,
438 ...) G_GNUC_NULL_TERMINATED;
439 GLIB_AVAILABLE_IN_ALL
440 gpointer g_object_connect (gpointer object,
441 const gchar *signal_spec,
442 ...) G_GNUC_NULL_TERMINATED;
443 GLIB_AVAILABLE_IN_ALL
444 void g_object_disconnect (gpointer object,
445 const gchar *signal_spec,
446 ...) G_GNUC_NULL_TERMINATED;
447 GLIB_AVAILABLE_IN_ALL
448 void g_object_set_valist (GObject *object,
449 const gchar *first_property_name,
450 va_list var_args);
451 GLIB_AVAILABLE_IN_ALL
452 void g_object_get_valist (GObject *object,
453 const gchar *first_property_name,
454 va_list var_args);
455 GLIB_AVAILABLE_IN_ALL
456 void g_object_set_property (GObject *object,
457 const gchar *property_name,
458 const GValue *value);
459 GLIB_AVAILABLE_IN_ALL
460 void g_object_get_property (GObject *object,
461 const gchar *property_name,
462 GValue *value);
463 GLIB_AVAILABLE_IN_ALL
464 void g_object_freeze_notify (GObject *object);
465 GLIB_AVAILABLE_IN_ALL
466 void g_object_notify (GObject *object,
467 const gchar *property_name);
468 GLIB_AVAILABLE_IN_ALL
469 void g_object_notify_by_pspec (GObject *object,
470 GParamSpec *pspec);
471 GLIB_AVAILABLE_IN_ALL
472 void g_object_thaw_notify (GObject *object);
473 GLIB_AVAILABLE_IN_ALL
474 gboolean g_object_is_floating (gpointer object);
475 GLIB_AVAILABLE_IN_ALL
476 gpointer g_object_ref_sink (gpointer object);
477 GLIB_AVAILABLE_IN_ALL
478 gpointer g_object_ref (gpointer object);
479 GLIB_AVAILABLE_IN_ALL
480 void g_object_unref (gpointer object);
481 GLIB_AVAILABLE_IN_ALL
482 void g_object_weak_ref (GObject *object,
483 GWeakNotify notify,
484 gpointer data);
485 GLIB_AVAILABLE_IN_ALL
486 void g_object_weak_unref (GObject *object,
487 GWeakNotify notify,
488 gpointer data);
489 GLIB_AVAILABLE_IN_ALL
490 void g_object_add_weak_pointer (GObject *object,
491 gpointer *weak_pointer_location);
492 GLIB_AVAILABLE_IN_ALL
493 void g_object_remove_weak_pointer (GObject *object,
494 gpointer *weak_pointer_location);
495  
496 /**
497 * GToggleNotify:
498 * @data: Callback data passed to g_object_add_toggle_ref()
499 * @object: The object on which g_object_add_toggle_ref() was called.
500 * @is_last_ref: %TRUE if the toggle reference is now the
501 * last reference to the object. %FALSE if the toggle
502 * reference was the last reference and there are now other
503 * references.
504 *
505 * A callback function used for notification when the state
506 * of a toggle reference changes. See g_object_add_toggle_ref().
507 */
508 typedef void (*GToggleNotify) (gpointer data,
509 GObject *object,
510 gboolean is_last_ref);
511  
512 GLIB_AVAILABLE_IN_ALL
513 void g_object_add_toggle_ref (GObject *object,
514 GToggleNotify notify,
515 gpointer data);
516 GLIB_AVAILABLE_IN_ALL
517 void g_object_remove_toggle_ref (GObject *object,
518 GToggleNotify notify,
519 gpointer data);
520  
521 GLIB_AVAILABLE_IN_ALL
522 gpointer g_object_get_qdata (GObject *object,
523 GQuark quark);
524 GLIB_AVAILABLE_IN_ALL
525 void g_object_set_qdata (GObject *object,
526 GQuark quark,
527 gpointer data);
528 GLIB_AVAILABLE_IN_ALL
529 void g_object_set_qdata_full (GObject *object,
530 GQuark quark,
531 gpointer data,
532 GDestroyNotify destroy);
533 GLIB_AVAILABLE_IN_ALL
534 gpointer g_object_steal_qdata (GObject *object,
535 GQuark quark);
536  
537 GLIB_AVAILABLE_IN_2_34
538 gpointer g_object_dup_qdata (GObject *object,
539 GQuark quark,
540 GDuplicateFunc dup_func,
541 gpointer user_data);
542 GLIB_AVAILABLE_IN_2_34
543 gboolean g_object_replace_qdata (GObject *object,
544 GQuark quark,
545 gpointer oldval,
546 gpointer newval,
547 GDestroyNotify destroy,
548 GDestroyNotify *old_destroy);
549  
550 GLIB_AVAILABLE_IN_ALL
551 gpointer g_object_get_data (GObject *object,
552 const gchar *key);
553 GLIB_AVAILABLE_IN_ALL
554 void g_object_set_data (GObject *object,
555 const gchar *key,
556 gpointer data);
557 GLIB_AVAILABLE_IN_ALL
558 void g_object_set_data_full (GObject *object,
559 const gchar *key,
560 gpointer data,
561 GDestroyNotify destroy);
562 GLIB_AVAILABLE_IN_ALL
563 gpointer g_object_steal_data (GObject *object,
564 const gchar *key);
565  
566 GLIB_AVAILABLE_IN_2_34
567 gpointer g_object_dup_data (GObject *object,
568 const gchar *key,
569 GDuplicateFunc dup_func,
570 gpointer user_data);
571 GLIB_AVAILABLE_IN_2_34
572 gboolean g_object_replace_data (GObject *object,
573 const gchar *key,
574 gpointer oldval,
575 gpointer newval,
576 GDestroyNotify destroy,
577 GDestroyNotify *old_destroy);
578  
579  
580 GLIB_AVAILABLE_IN_ALL
581 void g_object_watch_closure (GObject *object,
582 GClosure *closure);
583 GLIB_AVAILABLE_IN_ALL
584 GClosure* g_cclosure_new_object (GCallback callback_func,
585 GObject *object);
586 GLIB_AVAILABLE_IN_ALL
587 GClosure* g_cclosure_new_object_swap (GCallback callback_func,
588 GObject *object);
589 GLIB_AVAILABLE_IN_ALL
590 GClosure* g_closure_new_object (guint sizeof_closure,
591 GObject *object);
592 GLIB_AVAILABLE_IN_ALL
593 void g_value_set_object (GValue *value,
594 gpointer v_object);
595 GLIB_AVAILABLE_IN_ALL
596 gpointer g_value_get_object (const GValue *value);
597 GLIB_AVAILABLE_IN_ALL
598 gpointer g_value_dup_object (const GValue *value);
599 GLIB_AVAILABLE_IN_ALL
600 gulong g_signal_connect_object (gpointer instance,
601 const gchar *detailed_signal,
602 GCallback c_handler,
603 gpointer gobject,
604 GConnectFlags connect_flags);
605  
606 /*< protected >*/
607 GLIB_AVAILABLE_IN_ALL
608 void g_object_force_floating (GObject *object);
609 GLIB_AVAILABLE_IN_ALL
610 void g_object_run_dispose (GObject *object);
611  
612  
613 GLIB_AVAILABLE_IN_ALL
614 void g_value_take_object (GValue *value,
615 gpointer v_object);
616 GLIB_DEPRECATED_FOR(g_value_take_object)
617 void g_value_set_object_take_ownership (GValue *value,
618 gpointer v_object);
619  
620 GLIB_DEPRECATED
621 gsize g_object_compat_control (gsize what,
622 gpointer data);
623  
624 /* --- implementation macros --- */
625 #define G_OBJECT_WARN_INVALID_PSPEC(object, pname, property_id, pspec) \
626 G_STMT_START { \
627 GObject *_glib__object = (GObject*) (object); \
628 GParamSpec *_glib__pspec = (GParamSpec*) (pspec); \
629 guint _glib__property_id = (property_id); \
630 g_warning ("%s:%d: invalid %s id %u for \"%s\" of type '%s' in '%s'", \
631 __FILE__, __LINE__, \
632 (pname), \
633 _glib__property_id, \
634 _glib__pspec->name, \
635 g_type_name (G_PARAM_SPEC_TYPE (_glib__pspec)), \
636 G_OBJECT_TYPE_NAME (_glib__object)); \
637 } G_STMT_END
638 /**
639 * G_OBJECT_WARN_INVALID_PROPERTY_ID:
640 * @object: the #GObject on which set_property() or get_property() was called
641 * @property_id: the numeric id of the property
642 * @pspec: the #GParamSpec of the property
643 *
644 * This macro should be used to emit a standard warning about unexpected
645 * properties in set_property() and get_property() implementations.
646 */
647 #define G_OBJECT_WARN_INVALID_PROPERTY_ID(object, property_id, pspec) \
648 G_OBJECT_WARN_INVALID_PSPEC ((object), "property", (property_id), (pspec))
649  
650 GLIB_AVAILABLE_IN_ALL
651 void g_clear_object (volatile GObject **object_ptr);
652 #define g_clear_object(object_ptr) g_clear_pointer ((object_ptr), g_object_unref)
653  
654 /**
655 * g_set_object: (skip)
656 * @object_ptr: a pointer to a #GObject reference
657 * @new_object: (nullable) (transfer none): a pointer to the new #GObject to
658 * assign to it, or %NULL to clear the pointer
659 *
660 * Updates a #GObject pointer to refer to @new_object. It increments the
661 * reference count of @new_object (if non-%NULL), decrements the reference
662 * count of the current value of @object_ptr (if non-%NULL), and assigns
663 * @new_object to @object_ptr. The assignment is not atomic.
664 *
665 * @object_ptr must not be %NULL.
666 *
667 * A macro is also included that allows this function to be used without
668 * pointer casts. The function itself is static inline, so its address may vary
669 * between compilation units.
670 *
671 * One convenient usage of this function is in implementing property setters:
672 * |[
673 * void
674 * foo_set_bar (Foo *foo,
675 * Bar *new_bar)
676 * {
677 * g_return_if_fail (IS_FOO (foo));
678 * g_return_if_fail (new_bar == NULL || IS_BAR (new_bar));
679 *
680 * if (g_set_object (&foo->bar, new_bar))
681 * g_object_notify (foo, "bar");
682 * }
683 * ]|
684 *
685 * Returns: %TRUE if the value of @object_ptr changed, %FALSE otherwise
686 *
687 * Since: 2.44
688 */
689 static inline gboolean
690 (g_set_object) (GObject **object_ptr,
691 GObject *new_object)
692 {
693 GObject *old_object = *object_ptr;
694  
695 /* rely on g_object_[un]ref() to check the pointers are actually GObjects;
696 * elide a (object_ptr != NULL) check because most of the time we will be
697 * operating on struct members with a constant offset, so a NULL check would
698 * not catch bugs
699 */
700  
701 if (old_object == new_object)
702 return FALSE;
703  
704 if (new_object != NULL)
705 g_object_ref (new_object);
706  
707 *object_ptr = new_object;
708  
709 if (old_object != NULL)
710 g_object_unref (old_object);
711  
712 return TRUE;
713 }
714  
715 #define g_set_object(object_ptr, new_object) \
716 (/* Check types match. */ \
717  
718 (g_set_object) ((GObject **) (object_ptr), (GObject *) (new_object)) \
719 )
720  
721 typedef struct {
722 /*<private>*/
723 union { gpointer p; } priv;
724 } GWeakRef;
725  
726 GLIB_AVAILABLE_IN_ALL
727 void g_weak_ref_init (GWeakRef *weak_ref,
728 gpointer object);
729 GLIB_AVAILABLE_IN_ALL
730 void g_weak_ref_clear (GWeakRef *weak_ref);
731 GLIB_AVAILABLE_IN_ALL
732 gpointer g_weak_ref_get (GWeakRef *weak_ref);
733 GLIB_AVAILABLE_IN_ALL
734 void g_weak_ref_set (GWeakRef *weak_ref,
735 gpointer object);
736  
737 G_END_DECLS
738  
739 #endif /* __G_OBJECT_H__ */