luc14n0/glib
1
0
Fork 0
mirror of https://gitlab.gnome.org/GNOME/glib.git synced 2024-12-27 07:56:14 +01:00
Code Issues Packages Projects Releases Wiki Activity
69e9ba80e2
glib/gobject/gobject.h
Xavier Claessens e5565f6635 Rename all visibility macros
2022-10-13 20:53:56 -04:00

954 lines
35 KiB
C
Raw Blame History

This file contains ambiguous Unicode characters

This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

/* GObject - GLib Type, Object, Parameter and Signal Library
* Copyright (C) 1998-1999, 2000-2001 Tim Janik and Red Hat, Inc.
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General
* Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __G_OBJECT_H__
#define __G_OBJECT_H__
#if !defined (__GLIB_GOBJECT_H_INSIDE__) && !defined (GOBJECT_COMPILATION)
#error "Only <glib-object.h> can be included directly."
#endif
#include <gobject/gtype.h>
#include <gobject/gvalue.h>
#include <gobject/gparam.h>
#include <gobject/gclosure.h>
#include <gobject/gsignal.h>
#include <gobject/gboxed.h>
G_BEGIN_DECLS
/* --- type macros --- */
/**
* G_TYPE_IS_OBJECT:
* @type: Type id to check
*
* Check if the passed in type id is a %G_TYPE_OBJECT or derived from it.
*
* Returns: %FALSE or %TRUE, indicating whether @type is a %G_TYPE_OBJECT.
*/
#define G_TYPE_IS_OBJECT(type) (G_TYPE_FUNDAMENTAL (type) == G_TYPE_OBJECT)
/**
* G_OBJECT:
* @object: Object which is subject to casting.
*
* Casts a #GObject or derived pointer into a (GObject*) pointer.
*
* Depending on the current debugging level, this function may invoke
* certain runtime checks to identify invalid casts.
*/
#define G_OBJECT(object) (G_TYPE_CHECK_INSTANCE_CAST ((object), G_TYPE_OBJECT, GObject))
/**
* G_OBJECT_CLASS:
* @class: a valid #GObjectClass
*
* Casts a derived #GObjectClass structure into a #GObjectClass structure.
*/
#define G_OBJECT_CLASS(class) (G_TYPE_CHECK_CLASS_CAST ((class), G_TYPE_OBJECT, GObjectClass))
/**
* G_IS_OBJECT:
* @object: Instance to check for being a %G_TYPE_OBJECT.
*
* Checks whether a valid #GTypeInstance pointer is of type %G_TYPE_OBJECT.
*/
#if GLIB_VERSION_MAX_ALLOWED >= GLIB_VERSION_2_42
#define G_IS_OBJECT(object) (G_TYPE_CHECK_INSTANCE_FUNDAMENTAL_TYPE ((object), G_TYPE_OBJECT))
#else
#define G_IS_OBJECT(object) (G_TYPE_CHECK_INSTANCE_TYPE ((object), G_TYPE_OBJECT))
#endif
/**
* G_IS_OBJECT_CLASS:
* @class: a #GObjectClass
*
* Checks whether @class "is a" valid #GObjectClass structure of type
* %G_TYPE_OBJECT or derived.
*/
#define G_IS_OBJECT_CLASS(class) (G_TYPE_CHECK_CLASS_TYPE ((class), G_TYPE_OBJECT))
/**
* G_OBJECT_GET_CLASS:
* @object: a #GObject instance.
*
* Get the class structure associated to a #GObject instance.
*
* Returns: pointer to object class structure.
*/
#define G_OBJECT_GET_CLASS(object) (G_TYPE_INSTANCE_GET_CLASS ((object), G_TYPE_OBJECT, GObjectClass))
/**
* G_OBJECT_TYPE:
* @object: Object to return the type id for.
*
* Get the type id of an object.
*
* Returns: Type id of @object.
*/
#define G_OBJECT_TYPE(object) (G_TYPE_FROM_INSTANCE (object))
/**
* G_OBJECT_TYPE_NAME:
* @object: Object to return the type name for.
*
* Get the name of an object's type.
*
* Returns: Type name of @object. The string is owned by the type system and
* should not be freed.
*/
#define G_OBJECT_TYPE_NAME(object) (g_type_name (G_OBJECT_TYPE (object)))
/**
* G_OBJECT_CLASS_TYPE:
* @class: a valid #GObjectClass
*
* Get the type id of a class structure.
*
* Returns: Type id of @class.
*/
#define G_OBJECT_CLASS_TYPE(class) (G_TYPE_FROM_CLASS (class))
/**
* G_OBJECT_CLASS_NAME:
* @class: a valid #GObjectClass
*
* Return the name of a class structure's type.
*
* Returns: Type name of @class. The string is owned by the type system and
* should not be freed.
*/
#define G_OBJECT_CLASS_NAME(class) (g_type_name (G_OBJECT_CLASS_TYPE (class)))
/**
* G_VALUE_HOLDS_OBJECT:
* @value: a valid #GValue structure
*
* Checks whether the given #GValue can hold values derived from type %G_TYPE_OBJECT.
*
* Returns: %TRUE on success.
*/
#define G_VALUE_HOLDS_OBJECT(value) (G_TYPE_CHECK_VALUE_TYPE ((value), G_TYPE_OBJECT))
/* --- type macros --- */
/**
* G_TYPE_INITIALLY_UNOWNED:
*
* The type for #GInitiallyUnowned.
*/
#define G_TYPE_INITIALLY_UNOWNED (g_initially_unowned_get_type())
/**
* G_INITIALLY_UNOWNED:
* @object: Object which is subject to casting.
*
* Casts a #GInitiallyUnowned or derived pointer into a (GInitiallyUnowned*)
* pointer.
*
* Depending on the current debugging level, this function may invoke
* certain runtime checks to identify invalid casts.
*/
#define G_INITIALLY_UNOWNED(object) (G_TYPE_CHECK_INSTANCE_CAST ((object), G_TYPE_INITIALLY_UNOWNED, GInitiallyUnowned))
/**
* G_INITIALLY_UNOWNED_CLASS:
* @class: a valid #GInitiallyUnownedClass
*
* Casts a derived #GInitiallyUnownedClass structure into a
* #GInitiallyUnownedClass structure.
*/
#define G_INITIALLY_UNOWNED_CLASS(class) (G_TYPE_CHECK_CLASS_CAST ((class), G_TYPE_INITIALLY_UNOWNED, GInitiallyUnownedClass))
/**
* G_IS_INITIALLY_UNOWNED:
* @object: Instance to check for being a %G_TYPE_INITIALLY_UNOWNED.
*
* Checks whether a valid #GTypeInstance pointer is of type %G_TYPE_INITIALLY_UNOWNED.
*/
#define G_IS_INITIALLY_UNOWNED(object) (G_TYPE_CHECK_INSTANCE_TYPE ((object), G_TYPE_INITIALLY_UNOWNED))
/**
* G_IS_INITIALLY_UNOWNED_CLASS:
* @class: a #GInitiallyUnownedClass
*
* Checks whether @class "is a" valid #GInitiallyUnownedClass structure of type
* %G_TYPE_INITIALLY_UNOWNED or derived.
*/
#define G_IS_INITIALLY_UNOWNED_CLASS(class) (G_TYPE_CHECK_CLASS_TYPE ((class), G_TYPE_INITIALLY_UNOWNED))
/**
* G_INITIALLY_UNOWNED_GET_CLASS:
* @object: a #GInitiallyUnowned instance.
*
* Get the class structure associated to a #GInitiallyUnowned instance.
*
* Returns: pointer to object class structure.
*/
#define G_INITIALLY_UNOWNED_GET_CLASS(object) (G_TYPE_INSTANCE_GET_CLASS ((object), G_TYPE_INITIALLY_UNOWNED, GInitiallyUnownedClass))
/* GInitiallyUnowned ia a GObject with initially floating reference count */
/* --- typedefs & structures --- */
typedef struct _GObject GObject;
typedef struct _GObjectClass GObjectClass;
typedef struct _GObject GInitiallyUnowned;
typedef struct _GObjectClass GInitiallyUnownedClass;
typedef struct _GObjectConstructParam GObjectConstructParam;
/**
* GObjectGetPropertyFunc:
* @object: a #GObject
* @property_id: the numeric id under which the property was registered with
* g_object_class_install_property().
* @value: a #GValue to return the property value in
* @pspec: the #GParamSpec describing the property
*
* The type of the @get_property function of #GObjectClass.
*/
typedef void (*GObjectGetPropertyFunc) (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec);
/**
* GObjectSetPropertyFunc:
* @object: a #GObject
* @property_id: the numeric id under which the property was registered with
* g_object_class_install_property().
* @value: the new value for the property
* @pspec: the #GParamSpec describing the property
*
* The type of the @set_property function of #GObjectClass.
*/
typedef void (*GObjectSetPropertyFunc) (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec);
/**
* GObjectFinalizeFunc:
* @object: the #GObject being finalized
*
* The type of the @finalize function of #GObjectClass.
*/
typedef void (*GObjectFinalizeFunc) (GObject *object);
/**
* GWeakNotify:
* @data: data that was provided when the weak reference was established
* @where_the_object_was: the object being disposed
*
* A #GWeakNotify function can be added to an object as a callback that gets
* triggered when the object is finalized.
*
* Since the object is already being disposed when the #GWeakNotify is called,
* there's not much you could do with the object, apart from e.g. using its
* address as hash-index or the like.
*
* In particular, this means it’s invalid to call g_object_ref(),
* g_weak_ref_init(), g_weak_ref_set(), g_object_add_toggle_ref(),
* g_object_weak_ref(), g_object_add_weak_pointer() or any function which calls
* them on the object from this callback.
*/
typedef void (*GWeakNotify) (gpointer data,
GObject *where_the_object_was);
/**
* GObject:
*
* The base object type.
*
* All the fields in the `GObject` structure are private to the implementation
* and should never be accessed directly.
*
* Since GLib 2.72, all #GObjects are guaranteed to be aligned to at least the
* alignment of the largest basic GLib type (typically this is #guint64 or
* #gdouble). If you need larger alignment for an element in a #GObject, you
* should allocate it on the heap (aligned), or arrange for your #GObject to be
* appropriately padded. This guarantee applies to the #GObject (or derived)
* struct, the #GObjectClass (or derived) struct, and any private data allocated
* by G_ADD_PRIVATE().
*/
struct _GObject
{
GTypeInstance g_type_instance;
/*< private >*/
guint ref_count; /* (atomic) */
GData *qdata;
};
/**
* GObjectClass:
* @g_type_class: the parent class
* @constructor: the @constructor function is called by g_object_new () to
* complete the object initialization after all the construction properties are
* set. The first thing a @constructor implementation must do is chain up to the
* @constructor of the parent class. Overriding @constructor should be rarely
* needed, e.g. to handle construct properties, or to implement singletons.
* @set_property: the generic setter for all properties of this type. Should be
* overridden for every type with properties. If implementations of
* @set_property don't emit property change notification explicitly, this will
* be done implicitly by the type system. However, if the notify signal is
* emitted explicitly, the type system will not emit it a second time.
* @get_property: the generic getter for all properties of this type. Should be
* overridden for every type with properties.
* @dispose: the @dispose function is supposed to drop all references to other
* objects, but keep the instance otherwise intact, so that client method
* invocations still work. It may be run multiple times (due to reference
* loops). Before returning, @dispose should chain up to the @dispose method
* of the parent class.
* @finalize: instance finalization function, should finish the finalization of
* the instance begun in @dispose and chain up to the @finalize method of the
* parent class.
* @dispatch_properties_changed: emits property change notification for a bunch
* of properties. Overriding @dispatch_properties_changed should be rarely
* needed.
* @notify: the class closure for the notify signal
* @constructed: the @constructed function is called by g_object_new() as the
* final step of the object creation process. At the point of the call, all
* construction properties have been set on the object. The purpose of this
* call is to allow for object initialisation steps that can only be performed
* after construction properties have been set. @constructed implementors
* should chain up to the @constructed call of their parent class to allow it
* to complete its initialisation.
*
* The class structure for the GObject type.
*
* |[<!-- language="C" -->
* // Example of implementing a singleton using a constructor.
* static MySingleton *the_singleton = NULL;
*
* static GObject*
* my_singleton_constructor (GType type,
* guint n_construct_params,
* GObjectConstructParam *construct_params)
* {
* GObject *object;
*
* if (!the_singleton)
* {
* object = G_OBJECT_CLASS (parent_class)->constructor (type,
* n_construct_params,
* construct_params);
* the_singleton = MY_SINGLETON (object);
* }
* else
* object = g_object_ref (G_OBJECT (the_singleton));
*
* return object;
* }
* ]|
*/
struct _GObjectClass
{
GTypeClass g_type_class;
/*< private >*/
GSList *construct_properties;
/*< public >*/
/* seldom overridden */
GObject* (*constructor) (GType type,
guint n_construct_properties,
GObjectConstructParam *construct_properties);
/* overridable methods */
void (*set_property) (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec);
void (*get_property) (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec);
void (*dispose) (GObject *object);
void (*finalize) (GObject *object);
/* seldom overridden */
void (*dispatch_properties_changed) (GObject *object,
guint n_pspecs,
GParamSpec **pspecs);
/* signals */
void (*notify) (GObject *object,
GParamSpec *pspec);
/* called when done constructing */
void (*constructed) (GObject *object);
/*< private >*/
gsize flags;
gsize n_construct_properties;
gpointer pspecs;
gsize n_pspecs;
/* padding */
gpointer pdummy[3];
};
/**
* GObjectConstructParam:
* @pspec: the #GParamSpec of the construct parameter
* @value: the value to set the parameter to
*
* The GObjectConstructParam struct is an auxiliary structure used to hand
* #GParamSpec/#GValue pairs to the @constructor of a #GObjectClass.
*/
struct _GObjectConstructParam
{
GParamSpec *pspec;
GValue *value;
};
/**
* GInitiallyUnowned:
*
* A type for objects that have an initially floating reference.
*
* All the fields in the `GInitiallyUnowned` structure are private to the
* implementation and should never be accessed directly.
*/
/**
* GInitiallyUnownedClass:
*
* The class structure for the GInitiallyUnowned type.
*/
/* --- prototypes --- */
GOBJECT_AVAILABLE_IN_ALL
GType g_initially_unowned_get_type (void);
GOBJECT_AVAILABLE_IN_ALL
void g_object_class_install_property (GObjectClass *oclass,
guint property_id,
GParamSpec *pspec);
GOBJECT_AVAILABLE_IN_ALL
GParamSpec* g_object_class_find_property (GObjectClass *oclass,
const gchar *property_name);
GOBJECT_AVAILABLE_IN_ALL
GParamSpec**g_object_class_list_properties (GObjectClass *oclass,
guint *n_properties);
GOBJECT_AVAILABLE_IN_ALL
void g_object_class_override_property (GObjectClass *oclass,
guint property_id,
const gchar *name);
GOBJECT_AVAILABLE_IN_ALL
void g_object_class_install_properties (GObjectClass *oclass,
guint n_pspecs,
GParamSpec **pspecs);
GOBJECT_AVAILABLE_IN_ALL
void g_object_interface_install_property (gpointer g_iface,
GParamSpec *pspec);
GOBJECT_AVAILABLE_IN_ALL
GParamSpec* g_object_interface_find_property (gpointer g_iface,
const gchar *property_name);
GOBJECT_AVAILABLE_IN_ALL
GParamSpec**g_object_interface_list_properties (gpointer g_iface,
guint *n_properties_p);
GOBJECT_AVAILABLE_IN_ALL
GType g_object_get_type (void) G_GNUC_CONST;
GOBJECT_AVAILABLE_IN_ALL
gpointer g_object_new (GType object_type,
const gchar *first_property_name,
...);
GOBJECT_AVAILABLE_IN_2_54
GObject* g_object_new_with_properties (GType object_type,
guint n_properties,
const char *names[],
const GValue values[]);
G_GNUC_BEGIN_IGNORE_DEPRECATIONS
GOBJECT_DEPRECATED_IN_2_54_FOR(g_object_new_with_properties)
gpointer g_object_newv (GType object_type,
guint n_parameters,
GParameter *parameters);
G_GNUC_END_IGNORE_DEPRECATIONS
GOBJECT_AVAILABLE_IN_ALL
GObject* g_object_new_valist (GType object_type,
const gchar *first_property_name,
va_list var_args);
GOBJECT_AVAILABLE_IN_ALL
void g_object_set (gpointer object,
const gchar *first_property_name,
...) G_GNUC_NULL_TERMINATED;
GOBJECT_AVAILABLE_IN_ALL
void g_object_get (gpointer object,
const gchar *first_property_name,
...) G_GNUC_NULL_TERMINATED;
GOBJECT_AVAILABLE_IN_ALL
gpointer g_object_connect (gpointer object,
const gchar *signal_spec,
...) G_GNUC_NULL_TERMINATED;
GOBJECT_AVAILABLE_IN_ALL
void g_object_disconnect (gpointer object,
const gchar *signal_spec,
...) G_GNUC_NULL_TERMINATED;
GOBJECT_AVAILABLE_IN_2_54
void g_object_setv (GObject *object,
guint n_properties,
const gchar *names[],
const GValue values[]);
GOBJECT_AVAILABLE_IN_ALL
void g_object_set_valist (GObject *object,
const gchar *first_property_name,
va_list var_args);
GOBJECT_AVAILABLE_IN_2_54
void g_object_getv (GObject *object,
guint n_properties,
const gchar *names[],
GValue values[]);
GOBJECT_AVAILABLE_IN_ALL
void g_object_get_valist (GObject *object,
const gchar *first_property_name,
va_list var_args);
GOBJECT_AVAILABLE_IN_ALL
void g_object_set_property (GObject *object,
const gchar *property_name,
const GValue *value);
GOBJECT_AVAILABLE_IN_ALL
void g_object_get_property (GObject *object,
const gchar *property_name,
GValue *value);
GOBJECT_AVAILABLE_IN_ALL
void g_object_freeze_notify (GObject *object);
GOBJECT_AVAILABLE_IN_ALL
void g_object_notify (GObject *object,
const gchar *property_name);
GOBJECT_AVAILABLE_IN_ALL
void g_object_notify_by_pspec (GObject *object,
GParamSpec *pspec);
GOBJECT_AVAILABLE_IN_ALL
void g_object_thaw_notify (GObject *object);
GOBJECT_AVAILABLE_IN_ALL
gboolean g_object_is_floating (gpointer object);
GOBJECT_AVAILABLE_IN_ALL
gpointer g_object_ref_sink (gpointer object);
GOBJECT_AVAILABLE_IN_2_70
gpointer g_object_take_ref (gpointer object);
GOBJECT_AVAILABLE_IN_ALL
gpointer g_object_ref (gpointer object);
GOBJECT_AVAILABLE_IN_ALL
void g_object_unref (gpointer object);
GOBJECT_AVAILABLE_IN_ALL
void g_object_weak_ref (GObject *object,
GWeakNotify notify,
gpointer data);
GOBJECT_AVAILABLE_IN_ALL
void g_object_weak_unref (GObject *object,
GWeakNotify notify,
gpointer data);
GOBJECT_AVAILABLE_IN_ALL
void g_object_add_weak_pointer (GObject *object,
gpointer *weak_pointer_location);
GOBJECT_AVAILABLE_IN_ALL
void g_object_remove_weak_pointer (GObject *object,
gpointer *weak_pointer_location);
#if defined(glib_typeof) && GLIB_VERSION_MAX_ALLOWED >= GLIB_VERSION_2_56
/* Make reference APIs type safe with macros */
#define g_object_ref(Obj) ((glib_typeof (Obj)) (g_object_ref) (Obj))
#define g_object_ref_sink(Obj) ((glib_typeof (Obj)) (g_object_ref_sink) (Obj))
#endif
/**
* GToggleNotify:
* @data: Callback data passed to g_object_add_toggle_ref()
* @object: The object on which g_object_add_toggle_ref() was called.
* @is_last_ref: %TRUE if the toggle reference is now the
* last reference to the object. %FALSE if the toggle
* reference was the last reference and there are now other
* references.
*
* A callback function used for notification when the state
* of a toggle reference changes.
*
* See also: g_object_add_toggle_ref()
*/
typedef void (*GToggleNotify) (gpointer data,
GObject *object,
gboolean is_last_ref);
GOBJECT_AVAILABLE_IN_ALL
void g_object_add_toggle_ref (GObject *object,
GToggleNotify notify,
gpointer data);
GOBJECT_AVAILABLE_IN_ALL
void g_object_remove_toggle_ref (GObject *object,
GToggleNotify notify,
gpointer data);
GOBJECT_AVAILABLE_IN_ALL
gpointer g_object_get_qdata (GObject *object,
GQuark quark);
GOBJECT_AVAILABLE_IN_ALL
void g_object_set_qdata (GObject *object,
GQuark quark,
gpointer data);
GOBJECT_AVAILABLE_IN_ALL
void g_object_set_qdata_full (GObject *object,
GQuark quark,
gpointer data,
GDestroyNotify destroy);
GOBJECT_AVAILABLE_IN_ALL
gpointer g_object_steal_qdata (GObject *object,
GQuark quark);
GOBJECT_AVAILABLE_IN_2_34
gpointer g_object_dup_qdata (GObject *object,
GQuark quark,
GDuplicateFunc dup_func,
gpointer user_data);
GOBJECT_AVAILABLE_IN_2_34
gboolean g_object_replace_qdata (GObject *object,
GQuark quark,
gpointer oldval,
gpointer newval,
GDestroyNotify destroy,
GDestroyNotify *old_destroy);
GOBJECT_AVAILABLE_IN_ALL
gpointer g_object_get_data (GObject *object,
const gchar *key);
GOBJECT_AVAILABLE_IN_ALL
void g_object_set_data (GObject *object,
const gchar *key,
gpointer data);
GOBJECT_AVAILABLE_IN_ALL
void g_object_set_data_full (GObject *object,
const gchar *key,
gpointer data,
GDestroyNotify destroy);
GOBJECT_AVAILABLE_IN_ALL
gpointer g_object_steal_data (GObject *object,
const gchar *key);
GOBJECT_AVAILABLE_IN_2_34
gpointer g_object_dup_data (GObject *object,
const gchar *key,
GDuplicateFunc dup_func,
gpointer user_data);
GOBJECT_AVAILABLE_IN_2_34
gboolean g_object_replace_data (GObject *object,
const gchar *key,
gpointer oldval,
gpointer newval,
GDestroyNotify destroy,
GDestroyNotify *old_destroy);
GOBJECT_AVAILABLE_IN_ALL
void g_object_watch_closure (GObject *object,
GClosure *closure);
GOBJECT_AVAILABLE_IN_ALL
GClosure* g_cclosure_new_object (GCallback callback_func,
GObject *object);
GOBJECT_AVAILABLE_IN_ALL
GClosure* g_cclosure_new_object_swap (GCallback callback_func,
GObject *object);
GOBJECT_AVAILABLE_IN_ALL
GClosure* g_closure_new_object (guint sizeof_closure,
GObject *object);
GOBJECT_AVAILABLE_IN_ALL
void g_value_set_object (GValue *value,
gpointer v_object);
GOBJECT_AVAILABLE_IN_ALL
gpointer g_value_get_object (const GValue *value);
GOBJECT_AVAILABLE_IN_ALL
gpointer g_value_dup_object (const GValue *value);
GOBJECT_AVAILABLE_IN_ALL
gulong g_signal_connect_object (gpointer instance,
const gchar *detailed_signal,
GCallback c_handler,
gpointer gobject,
GConnectFlags connect_flags);
/*< protected >*/
GOBJECT_AVAILABLE_IN_ALL
void g_object_force_floating (GObject *object);
GOBJECT_AVAILABLE_IN_ALL
void g_object_run_dispose (GObject *object);
GOBJECT_AVAILABLE_IN_ALL
void g_value_take_object (GValue *value,
gpointer v_object);
GOBJECT_DEPRECATED_FOR(g_value_take_object)
void g_value_set_object_take_ownership (GValue *value,
gpointer v_object);
GOBJECT_DEPRECATED
gsize g_object_compat_control (gsize what,
gpointer data);
/* --- implementation macros --- */
#define G_OBJECT_WARN_INVALID_PSPEC(object, pname, property_id, pspec) \
G_STMT_START { \
GObject *_glib__object = (GObject*) (object); \
GParamSpec *_glib__pspec = (GParamSpec*) (pspec); \
guint _glib__property_id = (property_id); \
g_warning ("%s:%d: invalid %s id %u for \"%s\" of type '%s' in '%s'", \
__FILE__, __LINE__, \
(pname), \
_glib__property_id, \
_glib__pspec->name, \
g_type_name (G_PARAM_SPEC_TYPE (_glib__pspec)), \
G_OBJECT_TYPE_NAME (_glib__object)); \
} G_STMT_END
/**
* G_OBJECT_WARN_INVALID_PROPERTY_ID:
* @object: the #GObject on which set_property() or get_property() was called
* @property_id: the numeric id of the property
* @pspec: the #GParamSpec of the property
*
* This macro should be used to emit a standard warning about unexpected
* properties in set_property() and get_property() implementations.
*/
#define G_OBJECT_WARN_INVALID_PROPERTY_ID(object, property_id, pspec) \
G_OBJECT_WARN_INVALID_PSPEC ((object), "property", (property_id), (pspec))
GOBJECT_AVAILABLE_IN_ALL
void g_clear_object (GObject **object_ptr);
#define g_clear_object(object_ptr) g_clear_pointer ((object_ptr), g_object_unref)
/**
* g_set_object: (skip)
* @object_ptr: (inout) (not optional) (nullable): a pointer to a #GObject reference
* @new_object: (nullable) (transfer none): a pointer to the new #GObject to
* assign to @object_ptr, or %NULL to clear the pointer
*
* Updates a #GObject pointer to refer to @new_object.
*
* It increments the reference count of @new_object (if non-%NULL), decrements
* the reference count of the current value of @object_ptr (if non-%NULL), and
* assigns @new_object to @object_ptr. The assignment is not atomic.
*
* @object_ptr must not be %NULL, but can point to a %NULL value.
*
* A macro is also included that allows this function to be used without
* pointer casts. The function itself is static inline, so its address may vary
* between compilation units.
*
* One convenient usage of this function is in implementing property setters:
* |[
* void
* foo_set_bar (Foo *foo,
* Bar *new_bar)
* {
* g_return_if_fail (IS_FOO (foo));
* g_return_if_fail (new_bar == NULL || IS_BAR (new_bar));
*
* if (g_set_object (&foo->bar, new_bar))
* g_object_notify (foo, "bar");
* }
* ]|
*
* Returns: %TRUE if the value of @object_ptr changed, %FALSE otherwise
*
* Since: 2.44
*/
static inline gboolean
(g_set_object) (GObject **object_ptr,
GObject *new_object)
{
GObject *old_object = *object_ptr;
/* rely on g_object_[un]ref() to check the pointers are actually GObjects;
* elide a (object_ptr != NULL) check because most of the time we will be
* operating on struct members with a constant offset, so a NULL check would
* not catch bugs
*/
if (old_object == new_object)
return FALSE;
if (new_object != NULL)
g_object_ref (new_object);
*object_ptr = new_object;
if (old_object != NULL)
g_object_unref (old_object);
return TRUE;
}
/* We need GCC for __extension__, which we need to sort out strict aliasing of @object_ptr */
#if defined(__GNUC__)
#define g_set_object(object_ptr, new_object) \
(G_GNUC_EXTENSION ({ \
G_STATIC_ASSERT (sizeof *(object_ptr) == sizeof (new_object)); \
/* Only one access, please; work around type aliasing */ \
union { char *in; GObject **out; } _object_ptr; \
_object_ptr.in = (char *) (object_ptr); \
/* Check types match */ \
(void) (0 ? *(object_ptr) = (new_object), FALSE : FALSE); \
(g_set_object) (_object_ptr.out, (GObject *) new_object); \
})) \
GOBJECT_AVAILABLE_MACRO_IN_2_44
#else /* if !defined(__GNUC__) */
#define g_set_object(object_ptr, new_object) \
(/* Check types match. */ \
0 ? *(object_ptr) = (new_object), FALSE : \
(g_set_object) ((GObject **) (object_ptr), (GObject *) (new_object)) \
)
#endif /* !defined(__GNUC__) */
/**
* g_assert_finalize_object: (skip)
* @object: (transfer full) (type GObject.Object): an object
*
* Assert that @object is non-%NULL, then release one reference to it with
* g_object_unref() and assert that it has been finalized (i.e. that there
* are no more references).
*
* If assertions are disabled via `G_DISABLE_ASSERT`,
* this macro just calls g_object_unref() without any further checks.
*
* This macro should only be used in regression tests.
*
* Since: 2.62
*/
static inline void
(g_assert_finalize_object) (GObject *object)
{
gpointer weak_pointer = object;
g_assert_true (G_IS_OBJECT (weak_pointer));
g_object_add_weak_pointer (object, &weak_pointer);
g_object_unref (weak_pointer);
g_assert_null (weak_pointer);
}
#ifdef G_DISABLE_ASSERT
#define g_assert_finalize_object(object) g_object_unref (object)
#else
#define g_assert_finalize_object(object) (g_assert_finalize_object ((GObject *) object))
#endif
/**
* g_clear_weak_pointer: (skip)
* @weak_pointer_location: The memory address of a pointer
*
* Clears a weak reference to a #GObject.
*
* @weak_pointer_location must not be %NULL.
*
* If the weak reference is %NULL then this function does nothing.
* Otherwise, the weak reference to the object is removed for that location
* and the pointer is set to %NULL.
*
* A macro is also included that allows this function to be used without
* pointer casts. The function itself is static inline, so its address may vary
* between compilation units.
*
* Since: 2.56
*/
static inline void
(g_clear_weak_pointer) (gpointer *weak_pointer_location)
{
GObject *object = (GObject *) *weak_pointer_location;
if (object != NULL)
{
g_object_remove_weak_pointer (object, weak_pointer_location);
*weak_pointer_location = NULL;
}
}
#define g_clear_weak_pointer(weak_pointer_location) \
(/* Check types match. */ \
(g_clear_weak_pointer) ((gpointer *) (weak_pointer_location)) \
)
/**
* g_set_weak_pointer: (skip)
* @weak_pointer_location: the memory address of a pointer
* @new_object: (nullable) (transfer none): a pointer to the new #GObject to
* assign to it, or %NULL to clear the pointer
*
* Updates a pointer to weakly refer to @new_object.
*
* It assigns @new_object to @weak_pointer_location and ensures
* that @weak_pointer_location will automatically be set to %NULL
* if @new_object gets destroyed. The assignment is not atomic.
* The weak reference is not thread-safe, see g_object_add_weak_pointer()
* for details.
*
* The @weak_pointer_location argument must not be %NULL.
*
* A macro is also included that allows this function to be used without
* pointer casts. The function itself is static inline, so its address may vary
* between compilation units.
*
* One convenient usage of this function is in implementing property setters:
* |[
* void
* foo_set_bar (Foo *foo,
* Bar *new_bar)
* {
* g_return_if_fail (IS_FOO (foo));
* g_return_if_fail (new_bar == NULL || IS_BAR (new_bar));
*
* if (g_set_weak_pointer (&foo->bar, new_bar))
* g_object_notify (foo, "bar");
* }
* ]|
*
* Returns: %TRUE if the value of @weak_pointer_location changed, %FALSE otherwise
*
* Since: 2.56
*/
static inline gboolean
(g_set_weak_pointer) (gpointer *weak_pointer_location,
GObject *new_object)
{
GObject *old_object = (GObject *) *weak_pointer_location;
/* elide a (weak_pointer_location != NULL) check because most of the time we
* will be operating on struct members with a constant offset, so a NULL
* check would not catch bugs
*/
if (old_object == new_object)
return FALSE;
if (old_object != NULL)
g_object_remove_weak_pointer (old_object, weak_pointer_location);
*weak_pointer_location = new_object;
if (new_object != NULL)
g_object_add_weak_pointer (new_object, weak_pointer_location);
return TRUE;
}
#define g_set_weak_pointer(weak_pointer_location, new_object) \
(/* Check types match. */ \
0 ? *(weak_pointer_location) = (new_object), FALSE : \
(g_set_weak_pointer) ((gpointer *) (weak_pointer_location), (GObject *) (new_object)) \
)
typedef struct {
/*<private>*/
union { gpointer p; } priv;
} GWeakRef;
GOBJECT_AVAILABLE_IN_ALL
void g_weak_ref_init (GWeakRef *weak_ref,
gpointer object);
GOBJECT_AVAILABLE_IN_ALL
void g_weak_ref_clear (GWeakRef *weak_ref);
GOBJECT_AVAILABLE_IN_ALL
gpointer g_weak_ref_get (GWeakRef *weak_ref);
GOBJECT_AVAILABLE_IN_ALL
void g_weak_ref_set (GWeakRef *weak_ref,
gpointer object);
G_END_DECLS
#endif /* __G_OBJECT_H__ */
Reference in New Issue View Git Blame Copy Permalink