1 /* GObject - GLib Type, Object, Parameter and Signal Library
2 * Copyright (C) 1998-1999, 2000-2001 Tim Janik and Red Hat, Inc.
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.
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.
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/>.
20 #if !defined (__GLIB_GOBJECT_H_INSIDE__) && !defined (GOBJECT_COMPILATION)
21 #error "Only <glib-object.h> can be included directly."
32 * @type: A #GType value.
34 * The fundamental type which is the ancestor of @type.
35 * Fundamental types are types that serve as ultimate bases for the derived types,
36 * thus they are the roots of distinct inheritance hierarchies.
38 #define G_TYPE_FUNDAMENTAL(type) (g_type_fundamental (type))
40 * G_TYPE_FUNDAMENTAL_MAX:
42 * An integer constant that represents the number of identifiers reserved
43 * for types that are assigned at compile-time.
45 #define G_TYPE_FUNDAMENTAL_MAX (255 << G_TYPE_FUNDAMENTAL_SHIFT)
47 /* Constant fundamental types,
52 * An invalid #GType used as error return value in some functions which return
55 #define G_TYPE_INVALID G_TYPE_MAKE_FUNDAMENTAL (0)
59 * A fundamental type which is used as a replacement for the C
62 #define G_TYPE_NONE G_TYPE_MAKE_FUNDAMENTAL (1)
66 * The fundamental type from which all interfaces are derived.
68 #define G_TYPE_INTERFACE G_TYPE_MAKE_FUNDAMENTAL (2)
72 * The fundamental type corresponding to #gchar.
73 * The type designated by G_TYPE_CHAR is unconditionally an 8-bit signed integer.
74 * This may or may not be the same type a the C type "gchar".
76 #define G_TYPE_CHAR G_TYPE_MAKE_FUNDAMENTAL (3)
80 * The fundamental type corresponding to #guchar.
82 #define G_TYPE_UCHAR G_TYPE_MAKE_FUNDAMENTAL (4)
86 * The fundamental type corresponding to #gboolean.
88 #define G_TYPE_BOOLEAN G_TYPE_MAKE_FUNDAMENTAL (5)
92 * The fundamental type corresponding to #gint.
94 #define G_TYPE_INT G_TYPE_MAKE_FUNDAMENTAL (6)
98 * The fundamental type corresponding to #guint.
100 #define G_TYPE_UINT G_TYPE_MAKE_FUNDAMENTAL (7)
104 * The fundamental type corresponding to #glong.
106 #define G_TYPE_LONG G_TYPE_MAKE_FUNDAMENTAL (8)
110 * The fundamental type corresponding to #gulong.
112 #define G_TYPE_ULONG G_TYPE_MAKE_FUNDAMENTAL (9)
116 * The fundamental type corresponding to #gint64.
118 #define G_TYPE_INT64 G_TYPE_MAKE_FUNDAMENTAL (10)
122 * The fundamental type corresponding to #guint64.
124 #define G_TYPE_UINT64 G_TYPE_MAKE_FUNDAMENTAL (11)
128 * The fundamental type from which all enumeration types are derived.
130 #define G_TYPE_ENUM G_TYPE_MAKE_FUNDAMENTAL (12)
134 * The fundamental type from which all flags types are derived.
136 #define G_TYPE_FLAGS G_TYPE_MAKE_FUNDAMENTAL (13)
140 * The fundamental type corresponding to #gfloat.
142 #define G_TYPE_FLOAT G_TYPE_MAKE_FUNDAMENTAL (14)
146 * The fundamental type corresponding to #gdouble.
148 #define G_TYPE_DOUBLE G_TYPE_MAKE_FUNDAMENTAL (15)
152 * The fundamental type corresponding to nul-terminated C strings.
154 #define G_TYPE_STRING G_TYPE_MAKE_FUNDAMENTAL (16)
158 * The fundamental type corresponding to #gpointer.
160 #define G_TYPE_POINTER G_TYPE_MAKE_FUNDAMENTAL (17)
164 * The fundamental type from which all boxed types are derived.
166 #define G_TYPE_BOXED G_TYPE_MAKE_FUNDAMENTAL (18)
170 * The fundamental type from which all #GParamSpec types are derived.
172 #define G_TYPE_PARAM G_TYPE_MAKE_FUNDAMENTAL (19)
176 * The fundamental type for #GObject.
178 #define G_TYPE_OBJECT G_TYPE_MAKE_FUNDAMENTAL (20)
182 * The fundamental type corresponding to #GVariant.
184 * All floating #GVariant instances passed through the #GType system are
187 * Note that callbacks in closures, and signal handlers
188 * for signals of return type %G_TYPE_VARIANT, must never return floating
191 * Note: GLib 2.24 did include a boxed type with this name. It was replaced
192 * with this fundamental type in 2.26.
196 #define G_TYPE_VARIANT G_TYPE_MAKE_FUNDAMENTAL (21)
199 /* Reserved fundamental type numbers to create new fundamental
200 * type IDs with G_TYPE_MAKE_FUNDAMENTAL().
201 * Send email to gtk-devel-list@gnome.org for reservations.
204 * G_TYPE_FUNDAMENTAL_SHIFT:
206 * Shift value used in converting numbers to type IDs.
208 #define G_TYPE_FUNDAMENTAL_SHIFT (2)
210 * G_TYPE_MAKE_FUNDAMENTAL:
211 * @x: the fundamental type number.
213 * Get the type ID for the fundamental type number @x.
214 * Use g_type_fundamental_next() instead of this macro to create new fundamental
219 #define G_TYPE_MAKE_FUNDAMENTAL(x) ((GType) ((x) << G_TYPE_FUNDAMENTAL_SHIFT))
221 * G_TYPE_RESERVED_GLIB_FIRST:
223 * First fundamental type number to create a new fundamental type id with
224 * G_TYPE_MAKE_FUNDAMENTAL() reserved for GLib.
226 #define G_TYPE_RESERVED_GLIB_FIRST (22)
228 * G_TYPE_RESERVED_GLIB_LAST:
230 * Last fundamental type number reserved for GLib.
232 #define G_TYPE_RESERVED_GLIB_LAST (31)
234 * G_TYPE_RESERVED_BSE_FIRST:
236 * First fundamental type number to create a new fundamental type id with
237 * G_TYPE_MAKE_FUNDAMENTAL() reserved for BSE.
239 #define G_TYPE_RESERVED_BSE_FIRST (32)
241 * G_TYPE_RESERVED_BSE_LAST:
243 * Last fundamental type number reserved for BSE.
245 #define G_TYPE_RESERVED_BSE_LAST (48)
247 * G_TYPE_RESERVED_USER_FIRST:
249 * First available fundamental type number to create new fundamental
250 * type id with G_TYPE_MAKE_FUNDAMENTAL().
252 #define G_TYPE_RESERVED_USER_FIRST (49)
255 /* Type Checking Macros
258 * G_TYPE_IS_FUNDAMENTAL:
259 * @type: A #GType value.
261 * Checks if @type is a fundamental type.
263 * Returns: %TRUE on success.
265 #define G_TYPE_IS_FUNDAMENTAL(type) ((type) <= G_TYPE_FUNDAMENTAL_MAX)
268 * @type: A #GType value.
270 * Checks if @type is derived (or in object-oriented terminology:
271 * inherited) from another type (this holds true for all non-fundamental
274 * Returns: %TRUE on success.
276 #define G_TYPE_IS_DERIVED(type) ((type) > G_TYPE_FUNDAMENTAL_MAX)
278 * G_TYPE_IS_INTERFACE:
279 * @type: A #GType value.
281 * Checks if @type is an interface type.
282 * An interface type provides a pure API, the implementation
283 * of which is provided by another type (which is then said to conform
284 * to the interface). GLib interfaces are somewhat analogous to Java
285 * interfaces and C++ classes containing only pure virtual functions,
286 * with the difference that GType interfaces are not derivable (but see
287 * g_type_interface_add_prerequisite() for an alternative).
289 * Returns: %TRUE on success.
291 #define G_TYPE_IS_INTERFACE(type) (G_TYPE_FUNDAMENTAL (type) == G_TYPE_INTERFACE)
294 * @type: A #GType value.
296 * Checks if @type is a classed type.
298 * Returns: %TRUE on success.
300 #define G_TYPE_IS_CLASSED(type) (g_type_test_flags ((type), G_TYPE_FLAG_CLASSED))
302 * G_TYPE_IS_INSTANTIATABLE:
303 * @type: A #GType value.
305 * Checks if @type can be instantiated. Instantiation is the
306 * process of creating an instance (object) of this type.
308 * Returns: %TRUE on success.
310 #define G_TYPE_IS_INSTANTIATABLE(type) (g_type_test_flags ((type), G_TYPE_FLAG_INSTANTIATABLE))
312 * G_TYPE_IS_DERIVABLE:
313 * @type: A #GType value.
315 * Checks if @type is a derivable type. A derivable type can
316 * be used as the base class of a flat (single-level) class hierarchy.
318 * Returns: %TRUE on success.
320 #define G_TYPE_IS_DERIVABLE(type) (g_type_test_flags ((type), G_TYPE_FLAG_DERIVABLE))
322 * G_TYPE_IS_DEEP_DERIVABLE:
323 * @type: A #GType value.
325 * Checks if @type is a deep derivable type. A deep derivable type
326 * can be used as the base class of a deep (multi-level) class hierarchy.
328 * Returns: %TRUE on success.
330 #define G_TYPE_IS_DEEP_DERIVABLE(type) (g_type_test_flags ((type), G_TYPE_FLAG_DEEP_DERIVABLE))
332 * G_TYPE_IS_ABSTRACT:
333 * @type: A #GType value.
335 * Checks if @type is an abstract type. An abstract type cannot be
336 * instantiated and is normally used as an abstract base class for
339 * Returns: %TRUE on success.
341 #define G_TYPE_IS_ABSTRACT(type) (g_type_test_flags ((type), G_TYPE_FLAG_ABSTRACT))
343 * G_TYPE_IS_VALUE_ABSTRACT:
344 * @type: A #GType value.
346 * Checks if @type is an abstract value type. An abstract value type introduces
347 * a value table, but can't be used for g_value_init() and is normally used as
348 * an abstract base type for derived value types.
350 * Returns: %TRUE on success.
352 #define G_TYPE_IS_VALUE_ABSTRACT(type) (g_type_test_flags ((type), G_TYPE_FLAG_VALUE_ABSTRACT))
354 * G_TYPE_IS_VALUE_TYPE:
355 * @type: A #GType value.
357 * Checks if @type is a value type and can be used with g_value_init().
359 * Returns: %TRUE on success.
361 #define G_TYPE_IS_VALUE_TYPE(type) (g_type_check_is_value_type (type))
363 * G_TYPE_HAS_VALUE_TABLE:
364 * @type: A #GType value.
366 * Checks if @type has a #GTypeValueTable.
368 * Returns: %TRUE on success.
370 #define G_TYPE_HAS_VALUE_TABLE(type) (g_type_value_table_peek (type) != NULL)
378 * A numerical value which represents the unique identifier of a registered
381 #if GLIB_SIZEOF_SIZE_T != GLIB_SIZEOF_LONG || !defined __cplusplus
383 #else /* for historic reasons, C++ links against gulong GTypes */
384 typedef gulong GType;
386 typedef struct _GValue GValue;
387 typedef union _GTypeCValue GTypeCValue;
388 typedef struct _GTypePlugin GTypePlugin;
389 typedef struct _GTypeClass GTypeClass;
390 typedef struct _GTypeInterface GTypeInterface;
391 typedef struct _GTypeInstance GTypeInstance;
392 typedef struct _GTypeInfo GTypeInfo;
393 typedef struct _GTypeFundamentalInfo GTypeFundamentalInfo;
394 typedef struct _GInterfaceInfo GInterfaceInfo;
395 typedef struct _GTypeValueTable GTypeValueTable;
396 typedef struct _GTypeQuery GTypeQuery;
399 /* Basic Type Structures
404 * An opaque structure used as the base of all classes.
414 * An opaque structure used as the base of all type instances.
416 struct _GTypeInstance
424 * An opaque structure used as the base of all interface types.
426 struct _GTypeInterface
429 GType g_type; /* iface type */
430 GType g_instance_type;
434 * @type: the #GType value of the type.
435 * @type_name: the name of the type.
436 * @class_size: the size of the class structure.
437 * @instance_size: the size of the instance structure.
439 * A structure holding information for a specific type. It is
440 * filled in by the g_type_query() function.
445 const gchar *type_name;
451 /* Casts, checks and accessors for structured types
452 * usage of these macros is reserved to type implementations only
456 * G_TYPE_CHECK_INSTANCE:
457 * @instance: Location of a #GTypeInstance structure.
459 * Checks if @instance is a valid #GTypeInstance structure,
460 * otherwise issues a warning and returns %FALSE.
462 * This macro should only be used in type implementations.
464 * Returns: %TRUE on success.
466 #define G_TYPE_CHECK_INSTANCE(instance) (_G_TYPE_CHI ((GTypeInstance*) (instance)))
468 * G_TYPE_CHECK_INSTANCE_CAST:
469 * @instance: Location of a #GTypeInstance structure.
470 * @g_type: The type to be returned.
471 * @c_type: The corresponding C type of @g_type.
473 * Checks that @instance is an instance of the type identified by @g_type
474 * and issues a warning if this is not the case. Returns @instance casted
475 * to a pointer to @c_type.
477 * This macro should only be used in type implementations.
479 #define G_TYPE_CHECK_INSTANCE_CAST(instance, g_type, c_type) (_G_TYPE_CIC ((instance), (g_type), c_type))
481 * G_TYPE_CHECK_INSTANCE_TYPE:
482 * @instance: Location of a #GTypeInstance structure.
483 * @g_type: The type to be checked
485 * Checks if @instance is an instance of the type identified by @g_type.
487 * This macro should only be used in type implementations.
489 * Returns: %TRUE on success.
491 #define G_TYPE_CHECK_INSTANCE_TYPE(instance, g_type) (_G_TYPE_CIT ((instance), (g_type)))
493 * G_TYPE_INSTANCE_GET_CLASS:
494 * @instance: Location of the #GTypeInstance structure.
495 * @g_type: The #GType of the class to be returned.
496 * @c_type: The C type of the class structure.
498 * Get the class structure of a given @instance, casted
499 * to a specified ancestor type @g_type of the instance.
501 * Note that while calling a GInstanceInitFunc(), the class pointer gets
502 * modified, so it might not always return the expected pointer.
504 * This macro should only be used in type implementations.
506 * Returns: a pointer to the class structure
508 #define G_TYPE_INSTANCE_GET_CLASS(instance, g_type, c_type) (_G_TYPE_IGC ((instance), (g_type), c_type))
510 * G_TYPE_INSTANCE_GET_INTERFACE:
511 * @instance: Location of the #GTypeInstance structure.
512 * @g_type: The #GType of the interface to be returned.
513 * @c_type: The C type of the interface structure.
515 * Get the interface structure for interface @g_type of a given @instance.
517 * This macro should only be used in type implementations.
519 * Returns: a pointer to the interface structure
521 #define G_TYPE_INSTANCE_GET_INTERFACE(instance, g_type, c_type) (_G_TYPE_IGI ((instance), (g_type), c_type))
523 * G_TYPE_CHECK_CLASS_CAST:
524 * @g_class: Location of a #GTypeClass structure.
525 * @g_type: The type to be returned.
526 * @c_type: The corresponding C type of class structure of @g_type.
528 * Checks that @g_class is a class structure of the type identified by @g_type
529 * and issues a warning if this is not the case. Returns @g_class casted
530 * to a pointer to @c_type.
532 * This macro should only be used in type implementations.
534 #define G_TYPE_CHECK_CLASS_CAST(g_class, g_type, c_type) (_G_TYPE_CCC ((g_class), (g_type), c_type))
536 * G_TYPE_CHECK_CLASS_TYPE:
537 * @g_class: Location of a #GTypeClass structure.
538 * @g_type: The type to be checked.
540 * Checks if @g_class is a class structure of the type identified by
543 * This macro should only be used in type implementations.
545 * Returns: %TRUE on success.
547 #define G_TYPE_CHECK_CLASS_TYPE(g_class, g_type) (_G_TYPE_CCT ((g_class), (g_type)))
549 * G_TYPE_CHECK_VALUE:
552 * Checks if @value has been initialized to hold values
555 * This macro should only be used in type implementations.
557 * Returns: %TRUE on success.
559 #define G_TYPE_CHECK_VALUE(value) (_G_TYPE_CHV ((value)))
561 * G_TYPE_CHECK_VALUE_TYPE:
563 * @g_type: The type to be checked.
565 * Checks if @value has been initialized to hold values
568 * This macro should only be used in type implementations.
570 * Returns: %TRUE on success.
572 #define G_TYPE_CHECK_VALUE_TYPE(value, g_type) (_G_TYPE_CVH ((value), (g_type)))
574 * G_TYPE_FROM_INSTANCE:
575 * @instance: Location of a valid #GTypeInstance structure.
577 * Get the type identifier from a given @instance structure.
579 * This macro should only be used in type implementations.
581 * Returns: the #GType
583 #define G_TYPE_FROM_INSTANCE(instance) (G_TYPE_FROM_CLASS (((GTypeInstance*) (instance))->g_class))
586 * @g_class: Location of a valid #GTypeClass structure.
588 * Get the type identifier from a given @class structure.
590 * This macro should only be used in type implementations.
592 * Returns: the #GType
594 #define G_TYPE_FROM_CLASS(g_class) (((GTypeClass*) (g_class))->g_type)
596 * G_TYPE_FROM_INTERFACE:
597 * @g_iface: Location of a valid #GTypeInterface structure.
599 * Get the type identifier from a given @interface structure.
601 * This macro should only be used in type implementations.
603 * Returns: the #GType
605 #define G_TYPE_FROM_INTERFACE(g_iface) (((GTypeInterface*) (g_iface))->g_type)
608 * G_TYPE_INSTANCE_GET_PRIVATE:
609 * @instance: the instance of a type deriving from @private_type.
610 * @g_type: the type identifying which private data to retrieve.
611 * @c_type: The C type for the private structure.
613 * Gets the private structure for a particular type.
614 * The private structure must have been registered in the
615 * class_init function with g_type_class_add_private().
617 * This macro should only be used in type implementations.
620 * Returns: a pointer to the private data structure.
622 #define G_TYPE_INSTANCE_GET_PRIVATE(instance, g_type, c_type) ((c_type*) g_type_instance_get_private ((GTypeInstance*) (instance), (g_type)))
625 * G_TYPE_CLASS_GET_PRIVATE:
626 * @klass: the class of a type deriving from @private_type.
627 * @g_type: the type identifying which private data to retrieve.
628 * @c_type: The C type for the private structure.
630 * Gets the private class structure for a particular type.
631 * The private structure must have been registered in the
632 * get_type() function with g_type_add_class_private().
634 * This macro should only be used in type implementations.
637 * Returns: a pointer to the private data structure.
639 #define G_TYPE_CLASS_GET_PRIVATE(klass, g_type, c_type) ((c_type*) g_type_class_get_private ((GTypeClass*) (klass), (g_type)))
643 * @G_TYPE_DEBUG_NONE: Print no messages.
644 * @G_TYPE_DEBUG_OBJECTS: Print messages about object bookkeeping.
645 * @G_TYPE_DEBUG_SIGNALS: Print messages about signal emissions.
646 * @G_TYPE_DEBUG_MASK: Mask covering all debug flags.
648 * These flags used to be passed to g_type_init_with_debug_flags() which
651 * If you need to enable debugging features, use the GOBJECT_DEBUG
652 * environment variable.
654 * Deprecated: 2.36: g_type_init() is now done automatically
656 typedef enum /*< skip >*/
658 G_TYPE_DEBUG_NONE = 0,
659 G_TYPE_DEBUG_OBJECTS = 1 << 0,
660 G_TYPE_DEBUG_SIGNALS = 1 << 1,
661 G_TYPE_DEBUG_MASK = 0x03
665 /* --- prototypes --- */
666 GLIB_DEPRECATED_IN_2_36
667 void g_type_init (void);
668 GLIB_DEPRECATED_IN_2_36
669 void g_type_init_with_debug_flags (GTypeDebugFlags debug_flags);
670 GLIB_AVAILABLE_IN_ALL
671 const gchar * g_type_name (GType type);
672 GLIB_AVAILABLE_IN_ALL
673 GQuark g_type_qname (GType type);
674 GLIB_AVAILABLE_IN_ALL
675 GType g_type_from_name (const gchar *name);
676 GLIB_AVAILABLE_IN_ALL
677 GType g_type_parent (GType type);
678 GLIB_AVAILABLE_IN_ALL
679 guint g_type_depth (GType type);
680 GLIB_AVAILABLE_IN_ALL
681 GType g_type_next_base (GType leaf_type,
683 GLIB_AVAILABLE_IN_ALL
684 gboolean g_type_is_a (GType type,
686 GLIB_AVAILABLE_IN_ALL
687 gpointer g_type_class_ref (GType type);
688 GLIB_AVAILABLE_IN_ALL
689 gpointer g_type_class_peek (GType type);
690 GLIB_AVAILABLE_IN_ALL
691 gpointer g_type_class_peek_static (GType type);
692 GLIB_AVAILABLE_IN_ALL
693 void g_type_class_unref (gpointer g_class);
694 GLIB_AVAILABLE_IN_ALL
695 gpointer g_type_class_peek_parent (gpointer g_class);
696 GLIB_AVAILABLE_IN_ALL
697 gpointer g_type_interface_peek (gpointer instance_class,
699 GLIB_AVAILABLE_IN_ALL
700 gpointer g_type_interface_peek_parent (gpointer g_iface);
702 GLIB_AVAILABLE_IN_ALL
703 gpointer g_type_default_interface_ref (GType g_type);
704 GLIB_AVAILABLE_IN_ALL
705 gpointer g_type_default_interface_peek (GType g_type);
706 GLIB_AVAILABLE_IN_ALL
707 void g_type_default_interface_unref (gpointer g_iface);
709 /* g_free() the returned arrays */
710 GLIB_AVAILABLE_IN_ALL
711 GType* g_type_children (GType type,
713 GLIB_AVAILABLE_IN_ALL
714 GType* g_type_interfaces (GType type,
715 guint *n_interfaces);
717 /* per-type _static_ data */
718 GLIB_AVAILABLE_IN_ALL
719 void g_type_set_qdata (GType type,
722 GLIB_AVAILABLE_IN_ALL
723 gpointer g_type_get_qdata (GType type,
725 GLIB_AVAILABLE_IN_ALL
726 void g_type_query (GType type,
730 /* --- type registration --- */
733 * @g_class: The #GTypeClass structure to initialize.
735 * A callback function used by the type system to do base initialization
736 * of the class structures of derived types. It is called as part of the
737 * initialization process of all derived classes and should reallocate
738 * or reset all dynamic class members copied over from the parent class.
739 * For example, class members (such as strings) that are not sufficiently
740 * handled by a plain memory copy of the parent class into the derived class
741 * have to be altered. See GClassInitFunc() for a discussion of the class
742 * intialization process.
744 typedef void (*GBaseInitFunc) (gpointer g_class);
747 * @g_class: The #GTypeClass structure to finalize.
749 * A callback function used by the type system to finalize those portions
750 * of a derived types class structure that were setup from the corresponding
751 * GBaseInitFunc() function. Class finalization basically works the inverse
752 * way in which class intialization is performed.
753 * See GClassInitFunc() for a discussion of the class intialization process.
755 typedef void (*GBaseFinalizeFunc) (gpointer g_class);
758 * @g_class: The #GTypeClass structure to initialize.
759 * @class_data: The @class_data member supplied via the #GTypeInfo structure.
761 * A callback function used by the type system to initialize the class
762 * of a specific type. This function should initialize all static class
764 * The initialization process of a class involves:
767 * 1 - Copying common members from the parent class over to the
768 * derived class structure.
771 * 2 - Zero initialization of the remaining members not copied
772 * over from the parent class.
775 * 3 - Invocation of the GBaseInitFunc() initializers of all parent
776 * types and the class' type.
779 * 4 - Invocation of the class' GClassInitFunc() initializer.
782 * Since derived classes are partially initialized through a memory copy
783 * of the parent class, the general rule is that GBaseInitFunc() and
784 * GBaseFinalizeFunc() should take care of necessary reinitialization
785 * and release of those class members that were introduced by the type
786 * that specified these GBaseInitFunc()/GBaseFinalizeFunc().
787 * GClassInitFunc() should only care about initializing static
788 * class members, while dynamic class members (such as allocated strings
789 * or reference counted resources) are better handled by a GBaseInitFunc()
790 * for this type, so proper initialization of the dynamic class members
791 * is performed for class initialization of derived types as well.
792 * An example may help to correspond the intend of the different class
797 * GObjectClass parent_class;
798 * gint static_integer;
799 * gchar *dynamic_string;
802 * type_a_base_class_init (TypeAClass *class)
804 * class->dynamic_string = g_strdup ("some string");
807 * type_a_base_class_finalize (TypeAClass *class)
809 * g_free (class->dynamic_string);
812 * type_a_class_init (TypeAClass *class)
814 * class->static_integer = 42;
818 * TypeAClass parent_class;
819 * gfloat static_float;
820 * GString *dynamic_gstring;
823 * type_b_base_class_init (TypeBClass *class)
825 * class->dynamic_gstring = g_string_new ("some other string");
828 * type_b_base_class_finalize (TypeBClass *class)
830 * g_string_free (class->dynamic_gstring);
833 * type_b_class_init (TypeBClass *class)
835 * class->static_float = 3.14159265358979323846;
838 * Initialization of TypeBClass will first cause initialization of
839 * TypeAClass (derived classes reference their parent classes, see
840 * g_type_class_ref() on this).
841 * Initialization of TypeAClass roughly involves zero-initializing its fields,
842 * then calling its GBaseInitFunc() type_a_base_class_init() to allocate
843 * its dynamic members (dynamic_string), and finally calling its GClassInitFunc()
844 * type_a_class_init() to initialize its static members (static_integer).
845 * The first step in the initialization process of TypeBClass is then
846 * a plain memory copy of the contents of TypeAClass into TypeBClass and
847 * zero-initialization of the remaining fields in TypeBClass.
848 * The dynamic members of TypeAClass within TypeBClass now need
849 * reinitialization which is performed by calling type_a_base_class_init()
850 * with an argument of TypeBClass.
851 * After that, the GBaseInitFunc() of TypeBClass, type_b_base_class_init()
852 * is called to allocate the dynamic members of TypeBClass (dynamic_gstring),
853 * and finally the GClassInitFunc() of TypeBClass, type_b_class_init(),
854 * is called to complete the initialization process with the static members
856 * Corresponding finalization counter parts to the GBaseInitFunc() functions
857 * have to be provided to release allocated resources at class finalization
860 typedef void (*GClassInitFunc) (gpointer g_class,
861 gpointer class_data);
863 * GClassFinalizeFunc:
864 * @g_class: The #GTypeClass structure to finalize.
865 * @class_data: The @class_data member supplied via the #GTypeInfo structure.
867 * A callback function used by the type system to finalize a class.
868 * This function is rarely needed, as dynamically allocated class resources
869 * should be handled by GBaseInitFunc() and GBaseFinalizeFunc().
870 * Also, specification of a GClassFinalizeFunc() in the #GTypeInfo
871 * structure of a static type is invalid, because classes of static types
872 * will never be finalized (they are artificially kept alive when their
873 * reference count drops to zero).
875 typedef void (*GClassFinalizeFunc) (gpointer g_class,
876 gpointer class_data);
879 * @instance: The instance to initialize.
880 * @g_class: The class of the type the instance is created for.
882 * A callback function used by the type system to initialize a new
883 * instance of a type. This function initializes all instance members and
884 * allocates any resources required by it.
886 * Initialization of a derived instance involves calling all its parent
887 * types instance initializers, so the class member of the instance
888 * is altered during its initialization to always point to the class that
889 * belongs to the type the current initializer was introduced for.
891 * The extended members of @instance are guaranteed to have been filled with
892 * zeros before this function is called.
894 typedef void (*GInstanceInitFunc) (GTypeInstance *instance,
897 * GInterfaceInitFunc:
898 * @g_iface: The interface structure to initialize.
899 * @iface_data: The @interface_data supplied via the #GInterfaceInfo structure.
901 * A callback function used by the type system to initialize a new
902 * interface. This function should initialize all internal data and
903 * allocate any resources required by the interface.
905 * The members of @iface_data are guaranteed to have been filled with
906 * zeros before this function is called.
908 typedef void (*GInterfaceInitFunc) (gpointer g_iface,
909 gpointer iface_data);
911 * GInterfaceFinalizeFunc:
912 * @g_iface: The interface structure to finalize.
913 * @iface_data: The @interface_data supplied via the #GInterfaceInfo structure.
915 * A callback function used by the type system to finalize an interface.
916 * This function should destroy any internal data and release any resources
917 * allocated by the corresponding GInterfaceInitFunc() function.
919 typedef void (*GInterfaceFinalizeFunc) (gpointer g_iface,
920 gpointer iface_data);
922 * GTypeClassCacheFunc:
923 * @cache_data: data that was given to the g_type_add_class_cache_func() call
924 * @g_class: The #GTypeClass structure which is unreferenced
926 * A callback function which is called when the reference count of a class
927 * drops to zero. It may use g_type_class_ref() to prevent the class from
928 * being freed. You should not call g_type_class_unref() from a
929 * #GTypeClassCacheFunc function to prevent infinite recursion, use
930 * g_type_class_unref_uncached() instead.
932 * The functions have to check the class id passed in to figure
933 * whether they actually want to cache the class of this type, since all
934 * classes are routed through the same #GTypeClassCacheFunc chain.
936 * Returns: %TRUE to stop further #GTypeClassCacheFuncs from being
937 * called, %FALSE to continue.
939 typedef gboolean (*GTypeClassCacheFunc) (gpointer cache_data,
940 GTypeClass *g_class);
942 * GTypeInterfaceCheckFunc:
943 * @check_data: data passed to g_type_add_interface_check().
944 * @g_iface: the interface that has been initialized
946 * A callback called after an interface vtable is initialized.
947 * See g_type_add_interface_check().
951 typedef void (*GTypeInterfaceCheckFunc) (gpointer check_data,
954 * GTypeFundamentalFlags:
955 * @G_TYPE_FLAG_CLASSED: Indicates a classed type.
956 * @G_TYPE_FLAG_INSTANTIATABLE: Indicates an instantiable type (implies classed).
957 * @G_TYPE_FLAG_DERIVABLE: Indicates a flat derivable type.
958 * @G_TYPE_FLAG_DEEP_DERIVABLE: Indicates a deep derivable type (implies derivable).
960 * Bit masks used to check or determine specific characteristics of a
963 typedef enum /*< skip >*/
965 G_TYPE_FLAG_CLASSED = (1 << 0),
966 G_TYPE_FLAG_INSTANTIATABLE = (1 << 1),
967 G_TYPE_FLAG_DERIVABLE = (1 << 2),
968 G_TYPE_FLAG_DEEP_DERIVABLE = (1 << 3)
969 } GTypeFundamentalFlags;
972 * @G_TYPE_FLAG_ABSTRACT: Indicates an abstract type. No instances can be
973 * created for an abstract type.
974 * @G_TYPE_FLAG_VALUE_ABSTRACT: Indicates an abstract value type, i.e. a type
975 * that introduces a value table, but can't be used for
978 * Bit masks used to check or determine characteristics of a type.
980 typedef enum /*< skip >*/
982 G_TYPE_FLAG_ABSTRACT = (1 << 4),
983 G_TYPE_FLAG_VALUE_ABSTRACT = (1 << 5)
987 * @class_size: Size of the class structure (required for interface, classed and instantiatable types).
988 * @base_init: Location of the base initialization function (optional).
989 * @base_finalize: Location of the base finalization function (optional).
990 * @class_init: Location of the class initialization function for
991 * classed and instantiatable types. Location of the default vtable
992 * inititalization function for interface types. (optional) This function
993 * is used both to fill in virtual functions in the class or default vtable,
994 * and to do type-specific setup such as registering signals and object
996 * @class_finalize: Location of the class finalization function for
997 * classed and instantiatable types. Location of the default vtable
998 * finalization function for interface types. (optional)
999 * @class_data: User-supplied data passed to the class init/finalize functions.
1000 * @instance_size: Size of the instance (object) structure (required for instantiatable types only).
1001 * @n_preallocs: Prior to GLib 2.10, it specified the number of pre-allocated (cached) instances to reserve memory for (0 indicates no caching). Since GLib 2.10, it is ignored, since instances are allocated with the [slice allocator][glib-Memory-Slices] now.
1002 * @instance_init: Location of the instance initialization function (optional, for instantiatable types only).
1003 * @value_table: A #GTypeValueTable function table for generic handling of GValues of this type (usually only
1004 * useful for fundamental types).
1006 * This structure is used to provide the type system with the information
1007 * required to initialize and destruct (finalize) a type's class and
1009 * The initialized structure is passed to the g_type_register_static() function
1010 * (or is copied into the provided #GTypeInfo structure in the
1011 * g_type_plugin_complete_type_info()). The type system will perform a deep
1012 * copy of this structure, so its memory does not need to be persistent
1013 * across invocation of g_type_register_static().
1017 /* interface types, classed types, instantiated types */
1020 GBaseInitFunc base_init;
1021 GBaseFinalizeFunc base_finalize;
1023 /* interface types, classed types, instantiated types */
1024 GClassInitFunc class_init;
1025 GClassFinalizeFunc class_finalize;
1026 gconstpointer class_data;
1028 /* instantiated types */
1029 guint16 instance_size;
1030 guint16 n_preallocs;
1031 GInstanceInitFunc instance_init;
1033 /* value handling */
1034 const GTypeValueTable *value_table;
1037 * GTypeFundamentalInfo:
1038 * @type_flags: #GTypeFundamentalFlags describing the characteristics of the fundamental type
1040 * A structure that provides information to the type system which is
1041 * used specifically for managing fundamental types.
1043 struct _GTypeFundamentalInfo
1045 GTypeFundamentalFlags type_flags;
1049 * @interface_init: location of the interface initialization function
1050 * @interface_finalize: location of the interface finalization function
1051 * @interface_data: user-supplied data passed to the interface init/finalize functions
1053 * A structure that provides information to the type system which is
1054 * used specifically for managing interface types.
1056 struct _GInterfaceInfo
1058 GInterfaceInitFunc interface_init;
1059 GInterfaceFinalizeFunc interface_finalize;
1060 gpointer interface_data;
1064 * @value_init: Default initialize @values contents by poking values
1065 * directly into the value->data array. The data array of
1066 * the #GValue passed into this function was zero-filled
1067 * with <function>memset()</function>, so no care has to
1068 * be taken to free any
1069 * old contents. E.g. for the implementation of a string
1070 * value that may never be %NULL, the implementation might
1073 * value->data[0].v_pointer = g_strdup ("");
1075 * @value_free: Free any old contents that might be left in the
1076 * data array of the passed in @value. No resources may
1077 * remain allocated through the #GValue contents after
1078 * this function returns. E.g. for our above string type:
1080 * // only free strings without a specific flag for static storage
1081 * if (!(value->data[1].v_uint & G_VALUE_NOCOPY_CONTENTS))
1082 * g_free (value->data[0].v_pointer);
1084 * @value_copy: @dest_value is a #GValue with zero-filled data section
1085 * and @src_value is a properly setup #GValue of same or
1087 * The purpose of this function is to copy the contents of
1088 * @src_value into @dest_value in a way, that even after
1089 * @src_value has been freed, the contents of @dest_value
1090 * remain valid. String type example:
1092 * dest_value->data[0].v_pointer = g_strdup (src_value->data[0].v_pointer);
1094 * @value_peek_pointer: If the value contents fit into a pointer, such as objects
1095 * or strings, return this pointer, so the caller can peek at
1096 * the current contents. To extend on our above string example:
1098 * return value->data[0].v_pointer;
1100 * @collect_format: A string format describing how to collect the contents of
1101 * this value bit-by-bit. Each character in the format represents
1102 * an argument to be collected, and the characters themselves indicate
1103 * the type of the argument. Currently supported arguments are:
1105 * <varlistentry><term /><listitem><para>
1106 * 'i' - Integers. passed as collect_values[].v_int.
1107 * </para></listitem></varlistentry>
1108 * <varlistentry><term /><listitem><para>
1109 * 'l' - Longs. passed as collect_values[].v_long.
1110 * </para></listitem></varlistentry>
1111 * <varlistentry><term /><listitem><para>
1112 * 'd' - Doubles. passed as collect_values[].v_double.
1113 * </para></listitem></varlistentry>
1114 * <varlistentry><term /><listitem><para>
1115 * 'p' - Pointers. passed as collect_values[].v_pointer.
1116 * </para></listitem></varlistentry>
1118 * It should be noted that for variable argument list construction,
1119 * ANSI C promotes every type smaller than an integer to an int, and
1120 * floats to doubles. So for collection of short int or char, 'i'
1121 * needs to be used, and for collection of floats 'd'.
1122 * @collect_value: The collect_value() function is responsible for converting the
1123 * values collected from a variable argument list into contents
1124 * suitable for storage in a GValue. This function should setup
1125 * @value similar to value_init(); e.g. for a string value that
1126 * does not allow %NULL pointers, it needs to either spew an error,
1127 * or do an implicit conversion by storing an empty string.
1128 * The @value passed in to this function has a zero-filled data
1129 * array, so just like for value_init() it is guaranteed to not
1130 * contain any old contents that might need freeing.
1131 * @n_collect_values is exactly the string length of @collect_format,
1132 * and @collect_values is an array of unions #GTypeCValue with
1133 * length @n_collect_values, containing the collected values
1134 * according to @collect_format.
1135 * @collect_flags is an argument provided as a hint by the caller.
1136 * It may contain the flag %G_VALUE_NOCOPY_CONTENTS indicating,
1137 * that the collected value contents may be considered "static"
1138 * for the duration of the @value lifetime.
1139 * Thus an extra copy of the contents stored in @collect_values is
1140 * not required for assignment to @value.
1141 * For our above string example, we continue with:
1143 * if (!collect_values[0].v_pointer)
1144 * value->data[0].v_pointer = g_strdup ("");
1145 * else if (collect_flags & G_VALUE_NOCOPY_CONTENTS)
1147 * value->data[0].v_pointer = collect_values[0].v_pointer;
1148 * // keep a flag for the value_free() implementation to not free this string
1149 * value->data[1].v_uint = G_VALUE_NOCOPY_CONTENTS;
1152 * value->data[0].v_pointer = g_strdup (collect_values[0].v_pointer);
1155 * It should be noted, that it is generally a bad idea to follow the
1156 * #G_VALUE_NOCOPY_CONTENTS hint for reference counted types. Due to
1157 * reentrancy requirements and reference count assertions performed
1158 * by the signal emission code, reference counts should always be
1159 * incremented for reference counted contents stored in the value->data
1160 * array. To deviate from our string example for a moment, and taking
1161 * a look at an exemplary implementation for collect_value() of
1164 * if (collect_values[0].v_pointer)
1166 * GObject *object = G_OBJECT (collect_values[0].v_pointer);
1167 * // never honour G_VALUE_NOCOPY_CONTENTS for ref-counted types
1168 * value->data[0].v_pointer = g_object_ref (object);
1172 * return g_strdup_printf ("Object passed as invalid NULL pointer");
1175 * The reference count for valid objects is always incremented,
1176 * regardless of @collect_flags. For invalid objects, the example
1177 * returns a newly allocated string without altering @value.
1178 * Upon success, collect_value() needs to return %NULL. If, however,
1179 * an error condition occurred, collect_value() may spew an
1180 * error by returning a newly allocated non-%NULL string, giving
1181 * a suitable description of the error condition.
1182 * The calling code makes no assumptions about the @value
1183 * contents being valid upon error returns, @value
1184 * is simply thrown away without further freeing. As such, it is
1185 * a good idea to not allocate #GValue contents, prior to returning
1186 * an error, however, collect_values() is not obliged to return
1187 * a correctly setup @value for error returns, simply because
1188 * any non-%NULL return is considered a fatal condition so further
1189 * program behaviour is undefined.
1190 * @lcopy_format: Format description of the arguments to collect for @lcopy_value,
1191 * analogous to @collect_format. Usually, @lcopy_format string consists
1192 * only of 'p's to provide lcopy_value() with pointers to storage locations.
1193 * @lcopy_value: This function is responsible for storing the @value contents into
1194 * arguments passed through a variable argument list which got
1195 * collected into @collect_values according to @lcopy_format.
1196 * @n_collect_values equals the string length of @lcopy_format,
1197 * and @collect_flags may contain %G_VALUE_NOCOPY_CONTENTS.
1198 * In contrast to collect_value(), lcopy_value() is obliged to
1199 * always properly support %G_VALUE_NOCOPY_CONTENTS.
1200 * Similar to collect_value() the function may prematurely abort
1201 * by returning a newly allocated string describing an error condition.
1202 * To complete the string example:
1204 * gchar **string_p = collect_values[0].v_pointer;
1206 * return g_strdup_printf ("string location passed as NULL");
1207 * if (collect_flags & G_VALUE_NOCOPY_CONTENTS)
1208 * *string_p = value->data[0].v_pointer;
1210 * *string_p = g_strdup (value->data[0].v_pointer);
1212 * And an illustrative version of lcopy_value() for
1213 * reference-counted types:
1215 * GObject **object_p = collect_values[0].v_pointer;
1217 * return g_strdup_printf ("object location passed as NULL");
1218 * if (!value->data[0].v_pointer)
1220 * else if (collect_flags & G_VALUE_NOCOPY_CONTENTS) /* always honour */
1221 * *object_p = value->data[0].v_pointer;
1223 * *object_p = g_object_ref (value->data[0].v_pointer);
1227 * The #GTypeValueTable provides the functions required by the #GValue implementation,
1228 * to serve as a container for values of a type.
1231 struct _GTypeValueTable
1233 void (*value_init) (GValue *value);
1234 void (*value_free) (GValue *value);
1235 void (*value_copy) (const GValue *src_value,
1236 GValue *dest_value);
1237 /* varargs functionality (optional) */
1238 gpointer (*value_peek_pointer) (const GValue *value);
1239 const gchar *collect_format;
1240 gchar* (*collect_value) (GValue *value,
1241 guint n_collect_values,
1242 GTypeCValue *collect_values,
1243 guint collect_flags);
1244 const gchar *lcopy_format;
1245 gchar* (*lcopy_value) (const GValue *value,
1246 guint n_collect_values,
1247 GTypeCValue *collect_values,
1248 guint collect_flags);
1250 GLIB_AVAILABLE_IN_ALL
1251 GType g_type_register_static (GType parent_type,
1252 const gchar *type_name,
1253 const GTypeInfo *info,
1255 GLIB_AVAILABLE_IN_ALL
1256 GType g_type_register_static_simple (GType parent_type,
1257 const gchar *type_name,
1259 GClassInitFunc class_init,
1260 guint instance_size,
1261 GInstanceInitFunc instance_init,
1264 GLIB_AVAILABLE_IN_ALL
1265 GType g_type_register_dynamic (GType parent_type,
1266 const gchar *type_name,
1267 GTypePlugin *plugin,
1269 GLIB_AVAILABLE_IN_ALL
1270 GType g_type_register_fundamental (GType type_id,
1271 const gchar *type_name,
1272 const GTypeInfo *info,
1273 const GTypeFundamentalInfo *finfo,
1275 GLIB_AVAILABLE_IN_ALL
1276 void g_type_add_interface_static (GType instance_type,
1277 GType interface_type,
1278 const GInterfaceInfo *info);
1279 GLIB_AVAILABLE_IN_ALL
1280 void g_type_add_interface_dynamic (GType instance_type,
1281 GType interface_type,
1282 GTypePlugin *plugin);
1283 GLIB_AVAILABLE_IN_ALL
1284 void g_type_interface_add_prerequisite (GType interface_type,
1285 GType prerequisite_type);
1286 GLIB_AVAILABLE_IN_ALL
1287 GType*g_type_interface_prerequisites (GType interface_type,
1288 guint *n_prerequisites);
1289 GLIB_AVAILABLE_IN_ALL
1290 void g_type_class_add_private (gpointer g_class,
1291 gsize private_size);
1292 GLIB_AVAILABLE_IN_2_38
1293 gint g_type_add_instance_private (GType class_type,
1294 gsize private_size);
1295 GLIB_AVAILABLE_IN_ALL
1296 gpointer g_type_instance_get_private (GTypeInstance *instance,
1297 GType private_type);
1298 GLIB_AVAILABLE_IN_2_38
1299 void g_type_class_adjust_private_offset (gpointer g_class,
1300 gint *private_size_or_offset);
1302 GLIB_AVAILABLE_IN_ALL
1303 void g_type_add_class_private (GType class_type,
1304 gsize private_size);
1305 GLIB_AVAILABLE_IN_ALL
1306 gpointer g_type_class_get_private (GTypeClass *klass,
1307 GType private_type);
1308 GLIB_AVAILABLE_IN_2_38
1309 gint g_type_class_get_instance_private_offset (gpointer g_class);
1311 GLIB_AVAILABLE_IN_2_34
1312 void g_type_ensure (GType type);
1313 GLIB_AVAILABLE_IN_2_36
1314 guint g_type_get_type_registration_serial (void);
1317 /* --- GType boilerplate --- */
1320 * @TN: The name of the new type, in Camel case.
1321 * @t_n: The name of the new type, in lowercase, with words
1323 * @T_P: The #GType of the parent type.
1325 * A convenience macro for type implementations, which declares a
1326 * class initialization function, an instance initialization function (see #GTypeInfo for information about
1327 * these) and a static variable named @t_n<!-- -->_parent_class pointing to the parent class. Furthermore, it defines
1328 * a *_get_type() function. See G_DEFINE_TYPE_EXTENDED() for an example.
1332 #define G_DEFINE_TYPE(TN, t_n, T_P) G_DEFINE_TYPE_EXTENDED (TN, t_n, T_P, 0, {})
1334 * G_DEFINE_TYPE_WITH_CODE:
1335 * @TN: The name of the new type, in Camel case.
1336 * @t_n: The name of the new type in lowercase, with words separated by '_'.
1337 * @T_P: The #GType of the parent type.
1338 * @_C_: Custom code that gets inserted in the *_get_type() function.
1340 * A convenience macro for type implementations.
1341 * Similar to G_DEFINE_TYPE(), but allows you to insert custom code into the
1342 * *_get_type() function, e.g. interface implementations via G_IMPLEMENT_INTERFACE().
1343 * See G_DEFINE_TYPE_EXTENDED() for an example.
1347 #define G_DEFINE_TYPE_WITH_CODE(TN, t_n, T_P, _C_) _G_DEFINE_TYPE_EXTENDED_BEGIN (TN, t_n, T_P, 0) {_C_;} _G_DEFINE_TYPE_EXTENDED_END()
1349 * G_DEFINE_TYPE_WITH_PRIVATE:
1350 * @TN: The name of the new type, in Camel case.
1351 * @t_n: The name of the new type, in lowercase, with words
1353 * @T_P: The #GType of the parent type.
1355 * A convenience macro for type implementations, which declares a
1356 * class initialization function, an instance initialization function (see #GTypeInfo for information about
1357 * these), a static variable named @t_n<!-- -->_parent_class pointing to the parent class, and adds private
1358 * instance data to the type. Furthermore, it defines a *_get_type() function. See G_DEFINE_TYPE_EXTENDED()
1361 * Note that private structs added with this macros must have a struct
1362 * name of the form <replaceable>@TN</replaceable>Private.
1366 #define G_DEFINE_TYPE_WITH_PRIVATE(TN, t_n, T_P) G_DEFINE_TYPE_EXTENDED (TN, t_n, T_P, 0, G_ADD_PRIVATE (TN))
1368 * G_DEFINE_ABSTRACT_TYPE:
1369 * @TN: The name of the new type, in Camel case.
1370 * @t_n: The name of the new type, in lowercase, with words
1372 * @T_P: The #GType of the parent type.
1374 * A convenience macro for type implementations.
1375 * Similar to G_DEFINE_TYPE(), but defines an abstract type.
1376 * See G_DEFINE_TYPE_EXTENDED() for an example.
1380 #define G_DEFINE_ABSTRACT_TYPE(TN, t_n, T_P) G_DEFINE_TYPE_EXTENDED (TN, t_n, T_P, G_TYPE_FLAG_ABSTRACT, {})
1382 * G_DEFINE_ABSTRACT_TYPE_WITH_CODE:
1383 * @TN: The name of the new type, in Camel case.
1384 * @t_n: The name of the new type, in lowercase, with words
1386 * @T_P: The #GType of the parent type.
1387 * @_C_: Custom code that gets inserted in the @type_name_get_type() function.
1389 * A convenience macro for type implementations.
1390 * Similar to G_DEFINE_TYPE_WITH_CODE(), but defines an abstract type and allows you to
1391 * insert custom code into the *_get_type() function, e.g. interface implementations
1392 * via G_IMPLEMENT_INTERFACE(). See G_DEFINE_TYPE_EXTENDED() for an example.
1396 #define G_DEFINE_ABSTRACT_TYPE_WITH_CODE(TN, t_n, T_P, _C_) _G_DEFINE_TYPE_EXTENDED_BEGIN (TN, t_n, T_P, G_TYPE_FLAG_ABSTRACT) {_C_;} _G_DEFINE_TYPE_EXTENDED_END()
1398 * G_DEFINE_ABSTRACT_TYPE_WITH_PRIVATE:
1399 * @TN: The name of the new type, in Camel case.
1400 * @t_n: The name of the new type, in lowercase, with words
1402 * @T_P: The #GType of the parent type.
1404 * Similar to G_DEFINE_TYPE_WITH_PRIVATE(), but defines an abstract type.
1405 * See G_DEFINE_TYPE_EXTENDED() for an example.
1409 #define G_DEFINE_ABSTRACT_TYPE_WITH_PRIVATE(TN, t_n, T_P) G_DEFINE_TYPE_EXTENDED (TN, t_n, T_P, G_TYPE_FLAG_ABSTRACT, G_ADD_PRIVATE (TN))
1411 * G_DEFINE_TYPE_EXTENDED:
1412 * @TN: The name of the new type, in Camel case.
1413 * @t_n: The name of the new type, in lowercase, with words
1415 * @T_P: The #GType of the parent type.
1416 * @_f_: #GTypeFlags to pass to g_type_register_static()
1417 * @_C_: Custom code that gets inserted in the *_get_type() function.
1419 * The most general convenience macro for type implementations, on which
1420 * G_DEFINE_TYPE(), etc are based.
1423 * G_DEFINE_TYPE_EXTENDED (GtkGadget,
1427 * G_IMPLEMENT_INTERFACE (TYPE_GIZMO,
1428 * gtk_gadget_gizmo_init));
1432 * static void gtk_gadget_init (GtkGadget *self);
1433 * static void gtk_gadget_class_init (GtkGadgetClass *klass);
1434 * static gpointer gtk_gadget_parent_class = NULL;
1435 * static void gtk_gadget_class_intern_init (gpointer klass)
1437 * gtk_gadget_parent_class = g_type_class_peek_parent (klass);
1438 * gtk_gadget_class_init ((GtkGadgetClass*) klass);
1442 * gtk_gadget_get_type (void)
1444 * static volatile gsize g_define_type_id__volatile = 0;
1445 * if (g_once_init_enter (&g_define_type_id__volatile))
1447 * GType g_define_type_id =
1448 * g_type_register_static_simple (GTK_TYPE_WIDGET,
1449 * g_intern_static_string ("GtkGadget"),
1450 * sizeof (GtkGadgetClass),
1451 * (GClassInitFunc) gtk_gadget_class_intern_init,
1452 * sizeof (GtkGadget),
1453 * (GInstanceInitFunc) gtk_gadget_init,
1456 * const GInterfaceInfo g_implement_interface_info = {
1457 * (GInterfaceInitFunc) gtk_gadget_gizmo_init
1459 * g_type_add_interface_static (g_define_type_id, TYPE_GIZMO, &g_implement_interface_info);
1461 * g_once_init_leave (&g_define_type_id__volatile, g_define_type_id);
1463 * return g_define_type_id__volatile;
1466 * The only pieces which have to be manually provided are the definitions of
1467 * the instance and class structure and the definitions of the instance and
1468 * class init functions.
1472 #define G_DEFINE_TYPE_EXTENDED(TN, t_n, T_P, _f_, _C_) _G_DEFINE_TYPE_EXTENDED_BEGIN (TN, t_n, T_P, _f_) {_C_;} _G_DEFINE_TYPE_EXTENDED_END()
1475 * G_DEFINE_INTERFACE:
1476 * @TN: The name of the new type, in Camel case.
1477 * @t_n: The name of the new type, in lowercase, with words separated by '_'.
1478 * @T_P: The #GType of the prerequisite type for the interface, or 0
1479 * (%G_TYPE_INVALID) for no prerequisite type.
1481 * A convenience macro for #GTypeInterface definitions, which declares
1482 * a default vtable initialization function and defines a *_get_type()
1485 * The macro expects the interface initialization function to have the
1486 * name `t_n ## _default_init`, and the interface structure to have the
1487 * name `TN ## Interface`.
1491 #define G_DEFINE_INTERFACE(TN, t_n, T_P) G_DEFINE_INTERFACE_WITH_CODE(TN, t_n, T_P, ;)
1494 * G_DEFINE_INTERFACE_WITH_CODE:
1495 * @TN: The name of the new type, in Camel case.
1496 * @t_n: The name of the new type, in lowercase, with words separated by '_'.
1497 * @T_P: The #GType of the prerequisite type for the interface, or 0
1498 * (%G_TYPE_INVALID) for no prerequisite type.
1499 * @_C_: Custom code that gets inserted in the *_get_type() function.
1501 * A convenience macro for #GTypeInterface definitions. Similar to
1502 * G_DEFINE_INTERFACE(), but allows you to insert custom code into the
1503 * *_get_type() function, e.g. additional interface implementations
1504 * via G_IMPLEMENT_INTERFACE(), or additional prerequisite types. See
1505 * G_DEFINE_TYPE_EXTENDED() for a similar example using
1506 * G_DEFINE_TYPE_WITH_CODE().
1510 #define G_DEFINE_INTERFACE_WITH_CODE(TN, t_n, T_P, _C_) _G_DEFINE_INTERFACE_EXTENDED_BEGIN(TN, t_n, T_P) {_C_;} _G_DEFINE_INTERFACE_EXTENDED_END()
1513 * G_IMPLEMENT_INTERFACE:
1514 * @TYPE_IFACE: The #GType of the interface to add
1515 * @iface_init: The interface init function
1517 * A convenience macro to ease interface addition in the @_C_ section
1518 * of G_DEFINE_TYPE_WITH_CODE() or G_DEFINE_ABSTRACT_TYPE_WITH_CODE().
1519 * See G_DEFINE_TYPE_EXTENDED() for an example.
1521 * Note that this macro can only be used together with the G_DEFINE_TYPE_*
1522 * macros, since it depends on variable names from those macros.
1526 #define G_IMPLEMENT_INTERFACE(TYPE_IFACE, iface_init) { \
1527 const GInterfaceInfo g_implement_interface_info = { \
1528 (GInterfaceInitFunc) iface_init, NULL, NULL \
1530 g_type_add_interface_static (g_define_type_id, TYPE_IFACE, &g_implement_interface_info); \
1535 * @TypeName: the name of the type in CamelCase
1537 * A convenience macro to ease adding private data to instances of a new type
1538 * in the @_C_ section of G_DEFINE_TYPE_WITH_CODE() or
1539 * G_DEFINE_ABSTRACT_TYPE_WITH_CODE().
1544 * typedef struct _MyObject MyObject;
1545 * typedef struct _MyObjectClass MyObjectClass;
1550 * } MyObjectPrivate;
1552 * G_DEFINE_TYPE_WITH_CODE (MyObject, my_object, G_TYPE_OBJECT,
1553 * G_ADD_PRIVATE (MyObject))
1556 * Will add MyObjectPrivate as the private data to any instance of the MyObject
1559 * G_DEFINE_TYPE_* macros will automatically create a private function
1560 * based on the arguments to this macro, which can be used to safely
1561 * retrieve the private data from an instance of the type; for instance:
1565 * my_object_get_foo (MyObject *obj)
1567 * MyObjectPrivate *priv = my_object_get_instance_private (obj);
1573 * my_object_set_bar (MyObject *obj,
1576 * MyObjectPrivate *priv = my_object_get_instance_private (obj);
1578 * if (priv->bar != bar)
1583 * Note that this macro can only be used together with the G_DEFINE_TYPE_*
1584 * macros, since it depends on variable names from those macros.
1586 * Also note that private structs added with these macros must have a struct
1587 * name of the form <replaceable>TypeName</replaceable>Private.
1591 #define G_ADD_PRIVATE(TypeName) { \
1592 TypeName##_private_offset = \
1593 g_type_add_instance_private (g_define_type_id, sizeof (TypeName##Private)); \
1598 * @TypeName: the name of the type in CamelCase
1599 * @field: the name of the field in the private data structure
1601 * Evaluates to the offset of the @field inside the instance private data
1602 * structure for @TypeName.
1604 * Note that this macro can only be used together with the G_DEFINE_TYPE_*
1605 * and G_ADD_PRIVATE() macros, since it depends on variable names from
1610 #define G_PRIVATE_OFFSET(TypeName, field) \
1611 (TypeName##_private_offset + (G_STRUCT_OFFSET (TypeName##Private, field)))
1614 * G_PRIVATE_FIELD_P:
1615 * @TypeName: the name of the type in CamelCase
1616 * @inst: the instance of @TypeName you wish to access
1617 * @field_name: the name of the field in the private data structure
1619 * Evaluates to a pointer to the @field_name inside the @inst private data
1620 * structure for @TypeName.
1622 * Note that this macro can only be used together with the G_DEFINE_TYPE_*
1623 * and G_ADD_PRIVATE() macros, since it depends on variable names from
1628 #define G_PRIVATE_FIELD_P(TypeName, inst, field_name) \
1629 G_STRUCT_MEMBER_P (inst, G_PRIVATE_OFFSET (TypeName, field_name))
1633 * @TypeName: the name of the type in CamelCase
1634 * @inst: the instance of @TypeName you wish to access
1635 * @field_type: the type of the field in the private data structure
1636 * @field_name: the name of the field in the private data structure
1638 * Evaluates to the @field_name inside the @inst private data
1639 * structure for @TypeName.
1641 * Note that this macro can only be used together with the G_DEFINE_TYPE_*
1642 * and G_ADD_PRIVATE() macros, since it depends on variable names from
1647 #define G_PRIVATE_FIELD(TypeName, inst, field_type, field_name) \
1648 G_STRUCT_MEMBER (field_type, inst, G_PRIVATE_OFFSET (TypeName, field_name))
1650 /* we need to have this macro under conditional expansion, as it references
1651 * a function that has been added in 2.38. see bug:
1652 * https://bugzilla.gnome.org/show_bug.cgi?id=703191
1654 #if GLIB_VERSION_MAX_ALLOWED >= GLIB_VERSION_2_38
1655 #define _G_DEFINE_TYPE_EXTENDED_CLASS_INIT(TypeName, type_name) \
1656 static void type_name##_class_intern_init (gpointer klass) \
1658 type_name##_parent_class = g_type_class_peek_parent (klass); \
1659 if (TypeName##_private_offset != 0) \
1660 g_type_class_adjust_private_offset (klass, &TypeName##_private_offset); \
1661 type_name##_class_init ((TypeName##Class*) klass); \
1665 #define _G_DEFINE_TYPE_EXTENDED_CLASS_INIT(TypeName, type_name) \
1666 static void type_name##_class_intern_init (gpointer klass) \
1668 type_name##_parent_class = g_type_class_peek_parent (klass); \
1669 type_name##_class_init ((TypeName##Class*) klass); \
1671 #endif /* GLIB_VERSION_MAX_ALLOWED >= GLIB_VERSION_2_38 */
1673 #define _G_DEFINE_TYPE_EXTENDED_BEGIN(TypeName, type_name, TYPE_PARENT, flags) \
1675 static void type_name##_init (TypeName *self); \
1676 static void type_name##_class_init (TypeName##Class *klass); \
1677 static gpointer type_name##_parent_class = NULL; \
1678 static gint TypeName##_private_offset; \
1680 _G_DEFINE_TYPE_EXTENDED_CLASS_INIT(TypeName, type_name) \
1683 static inline gpointer \
1684 type_name##_get_instance_private (TypeName *self) \
1686 return (G_STRUCT_MEMBER_P (self, TypeName##_private_offset)); \
1690 type_name##_get_type (void) \
1692 static volatile gsize g_define_type_id__volatile = 0; \
1693 if (g_once_init_enter (&g_define_type_id__volatile)) \
1695 GType g_define_type_id = \
1696 g_type_register_static_simple (TYPE_PARENT, \
1697 g_intern_static_string (#TypeName), \
1698 sizeof (TypeName##Class), \
1699 (GClassInitFunc) type_name##_class_intern_init, \
1700 sizeof (TypeName), \
1701 (GInstanceInitFunc) type_name##_init, \
1702 (GTypeFlags) flags); \
1703 { /* custom code follows */
1704 #define _G_DEFINE_TYPE_EXTENDED_END() \
1705 /* following custom code */ \
1707 g_once_init_leave (&g_define_type_id__volatile, g_define_type_id); \
1709 return g_define_type_id__volatile; \
1710 } /* closes type_name##_get_type() */
1712 #define _G_DEFINE_INTERFACE_EXTENDED_BEGIN(TypeName, type_name, TYPE_PREREQ) \
1714 static void type_name##_default_init (TypeName##Interface *klass); \
1717 type_name##_get_type (void) \
1719 static volatile gsize g_define_type_id__volatile = 0; \
1720 if (g_once_init_enter (&g_define_type_id__volatile)) \
1722 GType g_define_type_id = \
1723 g_type_register_static_simple (G_TYPE_INTERFACE, \
1724 g_intern_static_string (#TypeName), \
1725 sizeof (TypeName##Interface), \
1726 (GClassInitFunc)type_name##_default_init, \
1728 (GInstanceInitFunc)NULL, \
1731 g_type_interface_add_prerequisite (g_define_type_id, TYPE_PREREQ); \
1732 { /* custom code follows */
1733 #define _G_DEFINE_INTERFACE_EXTENDED_END() \
1734 /* following custom code */ \
1736 g_once_init_leave (&g_define_type_id__volatile, g_define_type_id); \
1738 return g_define_type_id__volatile; \
1739 } /* closes type_name##_get_type() */
1742 * G_DEFINE_BOXED_TYPE:
1743 * @TypeName: The name of the new type, in Camel case.
1744 * @type_name: The name of the new type, in lowercase, with words
1746 * @copy_func: the #GBoxedCopyFunc for the new type
1747 * @free_func: the #GBoxedFreeFunc for the new type
1749 * A convenience macro for boxed type implementations, which defines a
1750 * type_name_get_type() function registering the boxed type.
1754 #define G_DEFINE_BOXED_TYPE(TypeName, type_name, copy_func, free_func) G_DEFINE_BOXED_TYPE_WITH_CODE (TypeName, type_name, copy_func, free_func, {})
1756 * G_DEFINE_BOXED_TYPE_WITH_CODE:
1757 * @TypeName: The name of the new type, in Camel case.
1758 * @type_name: The name of the new type, in lowercase, with words
1760 * @copy_func: the #GBoxedCopyFunc for the new type
1761 * @free_func: the #GBoxedFreeFunc for the new type
1762 * @_C_: Custom code that gets inserted in the *_get_type() function.
1764 * A convenience macro for boxed type implementations.
1765 * Similar to G_DEFINE_BOXED_TYPE(), but allows to insert custom code into the
1766 * type_name_get_type() function, e.g. to register value transformations with
1767 * g_value_register_transform_func().
1771 #define G_DEFINE_BOXED_TYPE_WITH_CODE(TypeName, type_name, copy_func, free_func, _C_) _G_DEFINE_BOXED_TYPE_BEGIN (TypeName, type_name, copy_func, free_func) {_C_;} _G_DEFINE_TYPE_EXTENDED_END()
1773 /* Only use this in non-C++ on GCC >= 2.7, except for Darwin/ppc64.
1774 * See https://bugzilla.gnome.org/show_bug.cgi?id=647145
1776 #if !defined (__cplusplus) && (__GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 7)) && !(defined (__APPLE__) && defined (__ppc64__))
1777 #define _G_DEFINE_BOXED_TYPE_BEGIN(TypeName, type_name, copy_func, free_func) \
1779 type_name##_get_type (void) \
1781 static volatile gsize g_define_type_id__volatile = 0; \
1782 if (g_once_init_enter (&g_define_type_id__volatile)) \
1784 GType (* _g_register_boxed) \
1788 TypeName * (*do_copy_type) (TypeName *); \
1789 TypeName * (*do_const_copy_type) (const TypeName *); \
1790 GBoxedCopyFunc do_copy_boxed; \
1791 } __attribute__((__transparent_union__)), \
1794 void (* do_free_type) (TypeName *); \
1795 GBoxedFreeFunc do_free_boxed; \
1796 } __attribute__((__transparent_union__)) \
1797 ) = g_boxed_type_register_static; \
1798 GType g_define_type_id = \
1799 _g_register_boxed (g_intern_static_string (#TypeName), copy_func, free_func); \
1800 { /* custom code follows */
1802 #define _G_DEFINE_BOXED_TYPE_BEGIN(TypeName, type_name, copy_func, free_func) \
1804 type_name##_get_type (void) \
1806 static volatile gsize g_define_type_id__volatile = 0; \
1807 if (g_once_init_enter (&g_define_type_id__volatile)) \
1809 GType g_define_type_id = \
1810 g_boxed_type_register_static (g_intern_static_string (#TypeName), \
1811 (GBoxedCopyFunc) copy_func, \
1812 (GBoxedFreeFunc) free_func); \
1813 { /* custom code follows */
1814 #endif /* __GNUC__ */
1817 * G_DEFINE_POINTER_TYPE:
1818 * @TypeName: The name of the new type, in Camel case.
1819 * @type_name: The name of the new type, in lowercase, with words
1822 * A convenience macro for pointer type implementations, which defines a
1823 * type_name_get_type() function registering the pointer type.
1827 #define G_DEFINE_POINTER_TYPE(TypeName, type_name) G_DEFINE_POINTER_TYPE_WITH_CODE (TypeName, type_name, {})
1829 * G_DEFINE_POINTER_TYPE_WITH_CODE:
1830 * @TypeName: The name of the new type, in Camel case.
1831 * @type_name: The name of the new type, in lowercase, with words
1833 * @_C_: Custom code that gets inserted in the *_get_type() function.
1835 * A convenience macro for pointer type implementations.
1836 * Similar to G_DEFINE_POINTER_TYPE(), but allows to insert custom code into the
1837 * type_name_get_type() function.
1841 #define G_DEFINE_POINTER_TYPE_WITH_CODE(TypeName, type_name, _C_) _G_DEFINE_POINTER_TYPE_BEGIN (TypeName, type_name) {_C_;} _G_DEFINE_TYPE_EXTENDED_END()
1843 #define _G_DEFINE_POINTER_TYPE_BEGIN(TypeName, type_name) \
1845 type_name##_get_type (void) \
1847 static volatile gsize g_define_type_id__volatile = 0; \
1848 if (g_once_init_enter (&g_define_type_id__volatile)) \
1850 GType g_define_type_id = \
1851 g_pointer_type_register_static (g_intern_static_string (#TypeName)); \
1852 { /* custom code follows */
1854 /* --- protected (for fundamental type implementations) --- */
1855 GLIB_AVAILABLE_IN_ALL
1856 GTypePlugin* g_type_get_plugin (GType type);
1857 GLIB_AVAILABLE_IN_ALL
1858 GTypePlugin* g_type_interface_get_plugin (GType instance_type,
1859 GType interface_type);
1860 GLIB_AVAILABLE_IN_ALL
1861 GType g_type_fundamental_next (void);
1862 GLIB_AVAILABLE_IN_ALL
1863 GType g_type_fundamental (GType type_id);
1864 GLIB_AVAILABLE_IN_ALL
1865 GTypeInstance* g_type_create_instance (GType type);
1866 GLIB_AVAILABLE_IN_ALL
1867 void g_type_free_instance (GTypeInstance *instance);
1869 GLIB_AVAILABLE_IN_ALL
1870 void g_type_add_class_cache_func (gpointer cache_data,
1871 GTypeClassCacheFunc cache_func);
1872 GLIB_AVAILABLE_IN_ALL
1873 void g_type_remove_class_cache_func (gpointer cache_data,
1874 GTypeClassCacheFunc cache_func);
1875 GLIB_AVAILABLE_IN_ALL
1876 void g_type_class_unref_uncached (gpointer g_class);
1878 GLIB_AVAILABLE_IN_ALL
1879 void g_type_add_interface_check (gpointer check_data,
1880 GTypeInterfaceCheckFunc check_func);
1881 GLIB_AVAILABLE_IN_ALL
1882 void g_type_remove_interface_check (gpointer check_data,
1883 GTypeInterfaceCheckFunc check_func);
1885 GLIB_AVAILABLE_IN_ALL
1886 GTypeValueTable* g_type_value_table_peek (GType type);
1890 GLIB_AVAILABLE_IN_ALL
1891 gboolean g_type_check_instance (GTypeInstance *instance) G_GNUC_PURE;
1892 GLIB_AVAILABLE_IN_ALL
1893 GTypeInstance* g_type_check_instance_cast (GTypeInstance *instance,
1895 GLIB_AVAILABLE_IN_ALL
1896 gboolean g_type_check_instance_is_a (GTypeInstance *instance,
1897 GType iface_type) G_GNUC_PURE;
1898 GLIB_AVAILABLE_IN_ALL
1899 GTypeClass* g_type_check_class_cast (GTypeClass *g_class,
1901 GLIB_AVAILABLE_IN_ALL
1902 gboolean g_type_check_class_is_a (GTypeClass *g_class,
1903 GType is_a_type) G_GNUC_PURE;
1904 GLIB_AVAILABLE_IN_ALL
1905 gboolean g_type_check_is_value_type (GType type) G_GNUC_CONST;
1906 GLIB_AVAILABLE_IN_ALL
1907 gboolean g_type_check_value (GValue *value) G_GNUC_PURE;
1908 GLIB_AVAILABLE_IN_ALL
1909 gboolean g_type_check_value_holds (GValue *value,
1910 GType type) G_GNUC_PURE;
1911 GLIB_AVAILABLE_IN_ALL
1912 gboolean g_type_test_flags (GType type,
1913 guint flags) G_GNUC_CONST;
1916 /* --- debugging functions --- */
1917 GLIB_AVAILABLE_IN_ALL
1918 const gchar * g_type_name_from_instance (GTypeInstance *instance);
1919 GLIB_AVAILABLE_IN_ALL
1920 const gchar * g_type_name_from_class (GTypeClass *g_class);
1923 /* --- implementation bits --- */
1924 #ifndef G_DISABLE_CAST_CHECKS
1925 # define _G_TYPE_CIC(ip, gt, ct) \
1926 ((ct*) g_type_check_instance_cast ((GTypeInstance*) ip, gt))
1927 # define _G_TYPE_CCC(cp, gt, ct) \
1928 ((ct*) g_type_check_class_cast ((GTypeClass*) cp, gt))
1929 #else /* G_DISABLE_CAST_CHECKS */
1930 # define _G_TYPE_CIC(ip, gt, ct) ((ct*) ip)
1931 # define _G_TYPE_CCC(cp, gt, ct) ((ct*) cp)
1932 #endif /* G_DISABLE_CAST_CHECKS */
1933 #define _G_TYPE_CHI(ip) (g_type_check_instance ((GTypeInstance*) ip))
1934 #define _G_TYPE_CHV(vl) (g_type_check_value ((GValue*) vl))
1935 #define _G_TYPE_IGC(ip, gt, ct) ((ct*) (((GTypeInstance*) ip)->g_class))
1936 #define _G_TYPE_IGI(ip, gt, ct) ((ct*) g_type_interface_peek (((GTypeInstance*) ip)->g_class, gt))
1938 # define _G_TYPE_CIT(ip, gt) (G_GNUC_EXTENSION ({ \
1939 GTypeInstance *__inst = (GTypeInstance*) ip; GType __t = gt; gboolean __r; \
1942 else if (__inst->g_class && __inst->g_class->g_type == __t) \
1945 __r = g_type_check_instance_is_a (__inst, __t); \
1948 # define _G_TYPE_CCT(cp, gt) (G_GNUC_EXTENSION ({ \
1949 GTypeClass *__class = (GTypeClass*) cp; GType __t = gt; gboolean __r; \
1952 else if (__class->g_type == __t) \
1955 __r = g_type_check_class_is_a (__class, __t); \
1958 # define _G_TYPE_CVH(vl, gt) (G_GNUC_EXTENSION ({ \
1959 GValue *__val = (GValue*) vl; GType __t = gt; gboolean __r; \
1962 else if (__val->g_type == __t) \
1965 __r = g_type_check_value_holds (__val, __t); \
1968 #else /* !__GNUC__ */
1969 # define _G_TYPE_CIT(ip, gt) (g_type_check_instance_is_a ((GTypeInstance*) ip, gt))
1970 # define _G_TYPE_CCT(cp, gt) (g_type_check_class_is_a ((GTypeClass*) cp, gt))
1971 # define _G_TYPE_CVH(vl, gt) (g_type_check_value_holds ((GValue*) vl, gt))
1972 #endif /* !__GNUC__ */
1974 * G_TYPE_FLAG_RESERVED_ID_BIT:
1976 * A bit in the type number that's supposed to be left untouched.
1978 #define G_TYPE_FLAG_RESERVED_ID_BIT ((GType) (1 << 0))
1979 extern GTypeDebugFlags _g_type_debug_flags;
1983 #endif /* __G_TYPE_H__ */