gobject/gobject.h

   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   0 ? *(object_ptr) = (new_object), FALSE : \
 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__ */