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glib/gobject/gtype.h
Behdad Esfahbod ea6e2968bf [gobject] Fix G_DEFINE_BOXED_TYPE compilation with C++
2011-08-11 19:03:02 +02:00

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/* GObject - GLib Type, Object, Parameter and Signal Library
* Copyright (C) 1998-1999, 2000-2001 Tim Janik and Red Hat, Inc.
*
* 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 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, write to the
* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307, USA.
*/
#if !defined (__GLIB_GOBJECT_H_INSIDE__) && !defined (GOBJECT_COMPILATION)
#error "Only <glib-object.h> can be included directly."
#endif
#ifndef __G_TYPE_H__
#define __G_TYPE_H__
#include <glib.h>
G_BEGIN_DECLS
/* Basic Type Macros
*/
/**
* G_TYPE_FUNDAMENTAL:
* @type: A #GType value.
*
* The fundamental type which is the ancestor of @type.
* Fundamental types are types that serve as ultimate bases for the derived types,
* thus they are the roots of distinct inheritance hierarchies.
*/
#define G_TYPE_FUNDAMENTAL(type) (g_type_fundamental (type))
/**
* G_TYPE_FUNDAMENTAL_MAX:
*
* An integer constant that represents the number of identifiers reserved
* for types that are assigned at compile-time.
*/
#define G_TYPE_FUNDAMENTAL_MAX (255 << G_TYPE_FUNDAMENTAL_SHIFT)
/* Constant fundamental types,
* introduced by g_type_init().
*/
/**
* G_TYPE_INVALID:
*
* An invalid #GType used as error return value in some functions which return
* a #GType.
*/
#define G_TYPE_INVALID G_TYPE_MAKE_FUNDAMENTAL (0)
/**
* G_TYPE_NONE:
*
* A fundamental type which is used as a replacement for the C
* <literal>void</literal> return type.
*/
#define G_TYPE_NONE G_TYPE_MAKE_FUNDAMENTAL (1)
/**
* G_TYPE_INTERFACE:
*
* The fundamental type from which all interfaces are derived.
*/
#define G_TYPE_INTERFACE G_TYPE_MAKE_FUNDAMENTAL (2)
/**
* G_TYPE_CHAR:
*
* The fundamental type corresponding to #gchar.
* The type designated by G_TYPE_CHAR is unconditionally an 8-bit signed integer.
* This may or may not be the same type a the C type "gchar".
*/
#define G_TYPE_CHAR G_TYPE_MAKE_FUNDAMENTAL (3)
/**
* G_TYPE_UCHAR:
*
* The fundamental type corresponding to #guchar.
*/
#define G_TYPE_UCHAR G_TYPE_MAKE_FUNDAMENTAL (4)
/**
* G_TYPE_BOOLEAN:
*
* The fundamental type corresponding to #gboolean.
*/
#define G_TYPE_BOOLEAN G_TYPE_MAKE_FUNDAMENTAL (5)
/**
* G_TYPE_INT:
*
* The fundamental type corresponding to #gint.
*/
#define G_TYPE_INT G_TYPE_MAKE_FUNDAMENTAL (6)
/**
* G_TYPE_UINT:
*
* The fundamental type corresponding to #guint.
*/
#define G_TYPE_UINT G_TYPE_MAKE_FUNDAMENTAL (7)
/**
* G_TYPE_LONG:
*
* The fundamental type corresponding to #glong.
*/
#define G_TYPE_LONG G_TYPE_MAKE_FUNDAMENTAL (8)
/**
* G_TYPE_ULONG:
*
* The fundamental type corresponding to #gulong.
*/
#define G_TYPE_ULONG G_TYPE_MAKE_FUNDAMENTAL (9)
/**
* G_TYPE_INT64:
*
* The fundamental type corresponding to #gint64.
*/
#define G_TYPE_INT64 G_TYPE_MAKE_FUNDAMENTAL (10)
/**
* G_TYPE_UINT64:
*
* The fundamental type corresponding to #guint64.
*/
#define G_TYPE_UINT64 G_TYPE_MAKE_FUNDAMENTAL (11)
/**
* G_TYPE_ENUM:
*
* The fundamental type from which all enumeration types are derived.
*/
#define G_TYPE_ENUM G_TYPE_MAKE_FUNDAMENTAL (12)
/**
* G_TYPE_FLAGS:
*
* The fundamental type from which all flags types are derived.
*/
#define G_TYPE_FLAGS G_TYPE_MAKE_FUNDAMENTAL (13)
/**
* G_TYPE_FLOAT:
*
* The fundamental type corresponding to #gfloat.
*/
#define G_TYPE_FLOAT G_TYPE_MAKE_FUNDAMENTAL (14)
/**
* G_TYPE_DOUBLE:
*
* The fundamental type corresponding to #gdouble.
*/
#define G_TYPE_DOUBLE G_TYPE_MAKE_FUNDAMENTAL (15)
/**
* G_TYPE_STRING:
*
* The fundamental type corresponding to nul-terminated C strings.
*/
#define G_TYPE_STRING G_TYPE_MAKE_FUNDAMENTAL (16)
/**
* G_TYPE_POINTER:
*
* The fundamental type corresponding to #gpointer.
*/
#define G_TYPE_POINTER G_TYPE_MAKE_FUNDAMENTAL (17)
/**
* G_TYPE_BOXED:
*
* The fundamental type from which all boxed types are derived.
*/
#define G_TYPE_BOXED G_TYPE_MAKE_FUNDAMENTAL (18)
/**
* G_TYPE_PARAM:
*
* The fundamental type from which all #GParamSpec types are derived.
*/
#define G_TYPE_PARAM G_TYPE_MAKE_FUNDAMENTAL (19)
/**
* G_TYPE_OBJECT:
*
* The fundamental type for #GObject.
*/
#define G_TYPE_OBJECT G_TYPE_MAKE_FUNDAMENTAL (20)
/**
* G_TYPE_VARIANT:
*
* The fundamental type corresponding to #GVariant.
*
* All floating #GVariant instances passed through the #GType system are
* consumed.
*
* Note that callbacks in closures, and signal handlers
* for signals of return type %G_TYPE_VARIANT, must never return floating
* variants.
*
* Note: GLib 2.24 did include a boxed type with this name. It was replaced
* with this fundamental type in 2.26.
*
* Since: 2.26
*/
#define G_TYPE_VARIANT G_TYPE_MAKE_FUNDAMENTAL (21)
/* Reserved fundamental type numbers to create new fundamental
* type IDs with G_TYPE_MAKE_FUNDAMENTAL().
* Send email to gtk-devel-list@gnome.org for reservations.
*/
/**
* G_TYPE_FUNDAMENTAL_SHIFT:
*
* Shift value used in converting numbers to type IDs.
*/
#define G_TYPE_FUNDAMENTAL_SHIFT (2)
/**
* G_TYPE_MAKE_FUNDAMENTAL:
* @x: the fundamental type number.
*
* Get the type ID for the fundamental type number @x.
* Use g_type_fundamental_next() instead of this macro to create new fundamental
* types.
*
* Returns: the GType
*/
#define G_TYPE_MAKE_FUNDAMENTAL(x) ((GType) ((x) << G_TYPE_FUNDAMENTAL_SHIFT))
/**
* G_TYPE_RESERVED_GLIB_FIRST:
*
* First fundamental type number to create a new fundamental type id with
* G_TYPE_MAKE_FUNDAMENTAL() reserved for GLib.
*/
#define G_TYPE_RESERVED_GLIB_FIRST (22)
/**
* G_TYPE_RESERVED_GLIB_LAST:
*
* Last fundamental type number reserved for GLib.
*/
#define G_TYPE_RESERVED_GLIB_LAST (31)
/**
* G_TYPE_RESERVED_BSE_FIRST:
*
* First fundamental type number to create a new fundamental type id with
* G_TYPE_MAKE_FUNDAMENTAL() reserved for BSE.
*/
#define G_TYPE_RESERVED_BSE_FIRST (32)
/**
* G_TYPE_RESERVED_BSE_LAST:
*
* Last fundamental type number reserved for BSE.
*/
#define G_TYPE_RESERVED_BSE_LAST (48)
/**
* G_TYPE_RESERVED_USER_FIRST:
*
* First available fundamental type number to create new fundamental
* type id with G_TYPE_MAKE_FUNDAMENTAL().
*/
#define G_TYPE_RESERVED_USER_FIRST (49)
/* Type Checking Macros
*/
/**
* G_TYPE_IS_FUNDAMENTAL:
* @type: A #GType value.
*
* Checks if @type is a fundamental type.
*
* Returns: %TRUE on success.
*/
#define G_TYPE_IS_FUNDAMENTAL(type) ((type) <= G_TYPE_FUNDAMENTAL_MAX)
/**
* G_TYPE_IS_DERIVED:
* @type: A #GType value.
*
* Checks if @type is derived (or in object-oriented terminology:
* inherited) from another type (this holds true for all non-fundamental
* types).
*
* Returns: %TRUE on success.
*/
#define G_TYPE_IS_DERIVED(type) ((type) > G_TYPE_FUNDAMENTAL_MAX)
/**
* G_TYPE_IS_INTERFACE:
* @type: A #GType value.
*
* Checks if @type is an interface type.
* An interface type provides a pure API, the implementation
* of which is provided by another type (which is then said to conform
* to the interface). GLib interfaces are somewhat analogous to Java
* interfaces and C++ classes containing only pure virtual functions,
* with the difference that GType interfaces are not derivable (but see
* g_type_interface_add_prerequisite() for an alternative).
*
* Returns: %TRUE on success.
*/
#define G_TYPE_IS_INTERFACE(type) (G_TYPE_FUNDAMENTAL (type) == G_TYPE_INTERFACE)
/**
* G_TYPE_IS_CLASSED:
* @type: A #GType value.
*
* Checks if @type is a classed type.
*
* Returns: %TRUE on success.
*/
#define G_TYPE_IS_CLASSED(type) (g_type_test_flags ((type), G_TYPE_FLAG_CLASSED))
/**
* G_TYPE_IS_INSTANTIATABLE:
* @type: A #GType value.
*
* Checks if @type can be instantiated. Instantiation is the
* process of creating an instance (object) of this type.
*
* Returns: %TRUE on success.
*/
#define G_TYPE_IS_INSTANTIATABLE(type) (g_type_test_flags ((type), G_TYPE_FLAG_INSTANTIATABLE))
/**
* G_TYPE_IS_DERIVABLE:
* @type: A #GType value.
*
* Checks if @type is a derivable type. A derivable type can
* be used as the base class of a flat (single-level) class hierarchy.
*
* Returns: %TRUE on success.
*/
#define G_TYPE_IS_DERIVABLE(type) (g_type_test_flags ((type), G_TYPE_FLAG_DERIVABLE))
/**
* G_TYPE_IS_DEEP_DERIVABLE:
* @type: A #GType value.
*
* Checks if @type is a deep derivable type. A deep derivable type
* can be used as the base class of a deep (multi-level) class hierarchy.
*
* Returns: %TRUE on success.
*/
#define G_TYPE_IS_DEEP_DERIVABLE(type) (g_type_test_flags ((type), G_TYPE_FLAG_DEEP_DERIVABLE))
/**
* G_TYPE_IS_ABSTRACT:
* @type: A #GType value.
*
* Checks if @type is an abstract type. An abstract type cannot be
* instantiated and is normally used as an abstract base class for
* derived classes.
*
* Returns: %TRUE on success.
*/
#define G_TYPE_IS_ABSTRACT(type) (g_type_test_flags ((type), G_TYPE_FLAG_ABSTRACT))
/**
* G_TYPE_IS_VALUE_ABSTRACT:
* @type: A #GType value.
*
* Checks if @type is an abstract value type. An abstract value type introduces
* a value table, but can't be used for g_value_init() and is normally used as
* an abstract base type for derived value types.
*
* Returns: %TRUE on success.
*/
#define G_TYPE_IS_VALUE_ABSTRACT(type) (g_type_test_flags ((type), G_TYPE_FLAG_VALUE_ABSTRACT))
/**
* G_TYPE_IS_VALUE_TYPE:
* @type: A #GType value.
*
* Checks if @type is a value type and can be used with g_value_init().
*
* Returns: %TRUE on success.
*/
#define G_TYPE_IS_VALUE_TYPE(type) (g_type_check_is_value_type (type))
/**
* G_TYPE_HAS_VALUE_TABLE:
* @type: A #GType value.
*
* Checks if @type has a #GTypeValueTable.
*
* Returns: %TRUE on success.
*/
#define G_TYPE_HAS_VALUE_TABLE(type) (g_type_value_table_peek (type) != NULL)
/* Typedefs
*/
/**
* GType:
*
* A numerical value which represents the unique identifier of a registered
* type.
*/
#if GLIB_SIZEOF_SIZE_T != GLIB_SIZEOF_LONG || !defined __cplusplus
typedef gsize GType;
#else /* for historic reasons, C++ links against gulong GTypes */
typedef gulong GType;
#endif
typedef struct _GValue GValue;
typedef union _GTypeCValue GTypeCValue;
typedef struct _GTypePlugin GTypePlugin;
typedef struct _GTypeClass GTypeClass;
typedef struct _GTypeInterface GTypeInterface;
typedef struct _GTypeInstance GTypeInstance;
typedef struct _GTypeInfo GTypeInfo;
typedef struct _GTypeFundamentalInfo GTypeFundamentalInfo;
typedef struct _GInterfaceInfo GInterfaceInfo;
typedef struct _GTypeValueTable GTypeValueTable;
typedef struct _GTypeQuery GTypeQuery;
/* Basic Type Structures
*/
/**
* GTypeClass:
*
* An opaque structure used as the base of all classes.
*/
struct _GTypeClass
{
/*< private >*/
GType g_type;
};
/**
* GTypeInstance:
*
* An opaque structure used as the base of all type instances.
*/
struct _GTypeInstance
{
/*< private >*/
GTypeClass *g_class;
};
/**
* GTypeInterface:
*
* An opaque structure used as the base of all interface types.
*/
struct _GTypeInterface
{
/*< private >*/
GType g_type; /* iface type */
GType g_instance_type;
};
/**
* GTypeQuery:
* @type: the #GType value of the type.
* @type_name: the name of the type.
* @class_size: the size of the class structure.
* @instance_size: the size of the instance structure.
*
* A structure holding information for a specific type. It is
* filled in by the g_type_query() function.
*/
struct _GTypeQuery
{
GType type;
const gchar *type_name;
guint class_size;
guint instance_size;
};
/* Casts, checks and accessors for structured types
* usage of these macros is reserved to type implementations only
*/
/*< protected >*/
/**
* G_TYPE_CHECK_INSTANCE:
* @instance: Location of a #GTypeInstance structure.
*
* Checks if @instance is a valid #GTypeInstance structure,
* otherwise issues a warning and returns %FALSE.
*
* This macro should only be used in type implementations.
*
* Returns: %TRUE on success.
*/
#define G_TYPE_CHECK_INSTANCE(instance) (_G_TYPE_CHI ((GTypeInstance*) (instance)))
/**
* G_TYPE_CHECK_INSTANCE_CAST:
* @instance: Location of a #GTypeInstance structure.
* @g_type: The type to be returned.
* @c_type: The corresponding C type of @g_type.
*
* Checks that @instance is an instance of the type identified by @g_type
* and issues a warning if this is not the case. Returns @instance casted
* to a pointer to @c_type.
*
* This macro should only be used in type implementations.
*/
#define G_TYPE_CHECK_INSTANCE_CAST(instance, g_type, c_type) (_G_TYPE_CIC ((instance), (g_type), c_type))
/**
* G_TYPE_CHECK_INSTANCE_TYPE:
* @instance: Location of a #GTypeInstance structure.
* @g_type: The type to be checked
*
* Checks if @instance is an instance of the type identified by @g_type.
*
* This macro should only be used in type implementations.
*
* Returns: %TRUE on success.
*/
#define G_TYPE_CHECK_INSTANCE_TYPE(instance, g_type) (_G_TYPE_CIT ((instance), (g_type)))
/**
* G_TYPE_INSTANCE_GET_CLASS:
* @instance: Location of the #GTypeInstance structure.
* @g_type: The #GType of the class to be returned.
* @c_type: The C type of the class structure.
*
* Get the class structure of a given @instance, casted
* to a specified ancestor type @g_type of the instance.
*
* Note that while calling a GInstanceInitFunc(), the class pointer gets
* modified, so it might not always return the expected pointer.
*
* This macro should only be used in type implementations.
*
* Returns: a pointer to the class structure
*/
#define G_TYPE_INSTANCE_GET_CLASS(instance, g_type, c_type) (_G_TYPE_IGC ((instance), (g_type), c_type))
/**
* G_TYPE_INSTANCE_GET_INTERFACE:
* @instance: Location of the #GTypeInstance structure.
* @g_type: The #GType of the interface to be returned.
* @c_type: The C type of the interface structure.
*
* Get the interface structure for interface @g_type of a given @instance.
*
* This macro should only be used in type implementations.
*
* Returns: a pointer to the interface structure
*/
#define G_TYPE_INSTANCE_GET_INTERFACE(instance, g_type, c_type) (_G_TYPE_IGI ((instance), (g_type), c_type))
/**
* G_TYPE_CHECK_CLASS_CAST:
* @g_class: Location of a #GTypeClass structure.
* @g_type: The type to be returned.
* @c_type: The corresponding C type of class structure of @g_type.
*
* Checks that @g_class is a class structure of the type identified by @g_type
* and issues a warning if this is not the case. Returns @g_class casted
* to a pointer to @c_type.
*
* This macro should only be used in type implementations.
*/
#define G_TYPE_CHECK_CLASS_CAST(g_class, g_type, c_type) (_G_TYPE_CCC ((g_class), (g_type), c_type))
/**
* G_TYPE_CHECK_CLASS_TYPE:
* @g_class: Location of a #GTypeClass structure.
* @g_type: The type to be checked.
*
* Checks if @g_class is a class structure of the type identified by
* @g_type.
*
* This macro should only be used in type implementations.
*
* Returns: %TRUE on success.
*/
#define G_TYPE_CHECK_CLASS_TYPE(g_class, g_type) (_G_TYPE_CCT ((g_class), (g_type)))
/**
* G_TYPE_CHECK_VALUE:
* @value: a #GValue
*
* Checks if @value has been initialized to hold values
* of a value type.
*
* This macro should only be used in type implementations.
*
* Returns: %TRUE on success.
*/
#define G_TYPE_CHECK_VALUE(value) (_G_TYPE_CHV ((value)))
/**
* G_TYPE_CHECK_VALUE_TYPE:
* @value: a #GValue
* @g_type: The type to be checked.
*
* Checks if @value has been initialized to hold values
* of type @g_type.
*
* This macro should only be used in type implementations.
*
* Returns: %TRUE on success.
*/
#define G_TYPE_CHECK_VALUE_TYPE(value, g_type) (_G_TYPE_CVH ((value), (g_type)))
/**
* G_TYPE_FROM_INSTANCE:
* @instance: Location of a valid #GTypeInstance structure.
*
* Get the type identifier from a given @instance structure.
*
* This macro should only be used in type implementations.
*
* Returns: the #GType
*/
#define G_TYPE_FROM_INSTANCE(instance) (G_TYPE_FROM_CLASS (((GTypeInstance*) (instance))->g_class))
/**
* G_TYPE_FROM_CLASS:
* @g_class: Location of a valid #GTypeClass structure.
*
* Get the type identifier from a given @class structure.
*
* This macro should only be used in type implementations.
*
* Returns: the #GType
*/
#define G_TYPE_FROM_CLASS(g_class) (((GTypeClass*) (g_class))->g_type)
/**
* G_TYPE_FROM_INTERFACE:
* @g_iface: Location of a valid #GTypeInterface structure.
*
* Get the type identifier from a given @interface structure.
*
* This macro should only be used in type implementations.
*
* Returns: the #GType
*/
#define G_TYPE_FROM_INTERFACE(g_iface) (((GTypeInterface*) (g_iface))->g_type)
/**
* G_TYPE_INSTANCE_GET_PRIVATE:
* @instance: the instance of a type deriving from @private_type.
* @g_type: the type identifying which private data to retrieve.
* @c_type: The C type for the private structure.
*
* Gets the private structure for a particular type.
* The private structure must have been registered in the
* class_init function with g_type_class_add_private().
*
* This macro should only be used in type implementations.
*
* Since: 2.4
* Returns: a pointer to the private data structure.
*/
#define G_TYPE_INSTANCE_GET_PRIVATE(instance, g_type, c_type) ((c_type*) g_type_instance_get_private ((GTypeInstance*) (instance), (g_type)))
/**
* G_TYPE_CLASS_GET_PRIVATE:
* @klass: the class of a type deriving from @private_type.
* @g_type: the type identifying which private data to retrieve.
* @c_type: The C type for the private structure.
*
* Gets the private class structure for a particular type.
* The private structure must have been registered in the
* get_type() function with g_type_add_class_private().
*
* This macro should only be used in type implementations.
*
* Since: 2.24
* Returns: a pointer to the private data structure.
*/
#define G_TYPE_CLASS_GET_PRIVATE(klass, g_type, c_type) ((c_type*) g_type_class_get_private ((GTypeClass*) (klass), (g_type)))
/**
* GTypeDebugFlags:
* @G_TYPE_DEBUG_NONE: Print no messages.
* @G_TYPE_DEBUG_OBJECTS: Print messages about object bookkeeping.
* @G_TYPE_DEBUG_SIGNALS: Print messages about signal emissions.
* @G_TYPE_DEBUG_MASK: Mask covering all debug flags.
*
* The <type>GTypeDebugFlags</type> enumeration values can be passed to
* g_type_init_with_debug_flags() to trigger debugging messages during runtime.
* Note that the messages can also be triggered by setting the
* <envar>GOBJECT_DEBUG</envar> environment variable to a ':'-separated list of
* "objects" and "signals".
*/
typedef enum /*< skip >*/
{
G_TYPE_DEBUG_NONE = 0,
G_TYPE_DEBUG_OBJECTS = 1 << 0,
G_TYPE_DEBUG_SIGNALS = 1 << 1,
G_TYPE_DEBUG_MASK = 0x03
} GTypeDebugFlags;
/* --- prototypes --- */
void g_type_init (void);
void g_type_init_with_debug_flags (GTypeDebugFlags debug_flags);
const gchar * g_type_name (GType type);
GQuark g_type_qname (GType type);
GType g_type_from_name (const gchar *name);
GType g_type_parent (GType type);
guint g_type_depth (GType type);
GType g_type_next_base (GType leaf_type,
GType root_type);
gboolean g_type_is_a (GType type,
GType is_a_type);
gpointer g_type_class_ref (GType type);
gpointer g_type_class_peek (GType type);
gpointer g_type_class_peek_static (GType type);
void g_type_class_unref (gpointer g_class);
gpointer g_type_class_peek_parent (gpointer g_class);
gpointer g_type_interface_peek (gpointer instance_class,
GType iface_type);
gpointer g_type_interface_peek_parent (gpointer g_iface);
gpointer g_type_default_interface_ref (GType g_type);
gpointer g_type_default_interface_peek (GType g_type);
void g_type_default_interface_unref (gpointer g_iface);
/* g_free() the returned arrays */
GType* g_type_children (GType type,
guint *n_children);
GType* g_type_interfaces (GType type,
guint *n_interfaces);
/* per-type _static_ data */
void g_type_set_qdata (GType type,
GQuark quark,
gpointer data);
gpointer g_type_get_qdata (GType type,
GQuark quark);
void g_type_query (GType type,
GTypeQuery *query);
/* --- type registration --- */
/**
* GBaseInitFunc:
* @g_class: The #GTypeClass structure to initialize.
*
* A callback function used by the type system to do base initialization
* of the class structures of derived types. It is called as part of the
* initialization process of all derived classes and should reallocate
* or reset all dynamic class members copied over from the parent class.
* For example, class members (such as strings) that are not sufficiently
* handled by a plain memory copy of the parent class into the derived class
* have to be altered. See GClassInitFunc() for a discussion of the class
* intialization process.
*/
typedef void (*GBaseInitFunc) (gpointer g_class);
/**
* GBaseFinalizeFunc:
* @g_class: The #GTypeClass structure to finalize.
*
* A callback function used by the type system to finalize those portions
* of a derived types class structure that were setup from the corresponding
* GBaseInitFunc() function. Class finalization basically works the inverse
* way in which class intialization is performed.
* See GClassInitFunc() for a discussion of the class intialization process.
*/
typedef void (*GBaseFinalizeFunc) (gpointer g_class);
/**
* GClassInitFunc:
* @g_class: The #GTypeClass structure to initialize.
* @class_data: The @class_data member supplied via the #GTypeInfo structure.
*
* A callback function used by the type system to initialize the class
* of a specific type. This function should initialize all static class
* members.
* The initialization process of a class involves:
* <itemizedlist>
* <listitem><para>
* 1 - Copying common members from the parent class over to the
* derived class structure.
* </para></listitem>
* <listitem><para>
* 2 - Zero initialization of the remaining members not copied
* over from the parent class.
* </para></listitem>
* <listitem><para>
* 3 - Invocation of the GBaseInitFunc() initializers of all parent
* types and the class' type.
* </para></listitem>
* <listitem><para>
* 4 - Invocation of the class' GClassInitFunc() initializer.
* </para></listitem>
* </itemizedlist>
* Since derived classes are partially initialized through a memory copy
* of the parent class, the general rule is that GBaseInitFunc() and
* GBaseFinalizeFunc() should take care of necessary reinitialization
* and release of those class members that were introduced by the type
* that specified these GBaseInitFunc()/GBaseFinalizeFunc().
* GClassInitFunc() should only care about initializing static
* class members, while dynamic class members (such as allocated strings
* or reference counted resources) are better handled by a GBaseInitFunc()
* for this type, so proper initialization of the dynamic class members
* is performed for class initialization of derived types as well.
* An example may help to correspond the intend of the different class
* initializers:
*
* |[
* typedef struct {
* GObjectClass parent_class;
* gint static_integer;
* gchar *dynamic_string;
* } TypeAClass;
* static void
* type_a_base_class_init (TypeAClass *class)
* {
* class->dynamic_string = g_strdup ("some string");
* }
* static void
* type_a_base_class_finalize (TypeAClass *class)
* {
* g_free (class->dynamic_string);
* }
* static void
* type_a_class_init (TypeAClass *class)
* {
* class->static_integer = 42;
* }
*
* typedef struct {
* TypeAClass parent_class;
* gfloat static_float;
* GString *dynamic_gstring;
* } TypeBClass;
* static void
* type_b_base_class_init (TypeBClass *class)
* {
* class->dynamic_gstring = g_string_new ("some other string");
* }
* static void
* type_b_base_class_finalize (TypeBClass *class)
* {
* g_string_free (class->dynamic_gstring);
* }
* static void
* type_b_class_init (TypeBClass *class)
* {
* class->static_float = 3.14159265358979323846;
* }
* ]|
* Initialization of TypeBClass will first cause initialization of
* TypeAClass (derived classes reference their parent classes, see
* g_type_class_ref() on this).
* Initialization of TypeAClass roughly involves zero-initializing its fields,
* then calling its GBaseInitFunc() type_a_base_class_init() to allocate
* its dynamic members (dynamic_string), and finally calling its GClassInitFunc()
* type_a_class_init() to initialize its static members (static_integer).
* The first step in the initialization process of TypeBClass is then
* a plain memory copy of the contents of TypeAClass into TypeBClass and
* zero-initialization of the remaining fields in TypeBClass.
* The dynamic members of TypeAClass within TypeBClass now need
* reinitialization which is performed by calling type_a_base_class_init()
* with an argument of TypeBClass.
* After that, the GBaseInitFunc() of TypeBClass, type_b_base_class_init()
* is called to allocate the dynamic members of TypeBClass (dynamic_gstring),
* and finally the GClassInitFunc() of TypeBClass, type_b_class_init(),
* is called to complete the initialization process with the static members
* (static_float).
* Corresponding finalization counter parts to the GBaseInitFunc() functions
* have to be provided to release allocated resources at class finalization
* time.
*/
typedef void (*GClassInitFunc) (gpointer g_class,
gpointer class_data);
/**
* GClassFinalizeFunc:
* @g_class: The #GTypeClass structure to finalize.
* @class_data: The @class_data member supplied via the #GTypeInfo structure.
*
* A callback function used by the type system to finalize a class.
* This function is rarely needed, as dynamically allocated class resources
* should be handled by GBaseInitFunc() and GBaseFinalizeFunc().
* Also, specification of a GClassFinalizeFunc() in the #GTypeInfo
* structure of a static type is invalid, because classes of static types
* will never be finalized (they are artificially kept alive when their
* reference count drops to zero).
*/
typedef void (*GClassFinalizeFunc) (gpointer g_class,
gpointer class_data);
/**
* GInstanceInitFunc:
* @instance: The instance to initialize.
* @g_class: The class of the type the instance is created for.
*
* A callback function used by the type system to initialize a new
* instance of a type. This function initializes all instance members and
* allocates any resources required by it.
* Initialization of a derived instance involves calling all its parent
* types instance initializers, so the class member of the instance
* is altered during its initialization to always point to the class that
* belongs to the type the current initializer was introduced for.
*/
typedef void (*GInstanceInitFunc) (GTypeInstance *instance,
gpointer g_class);
/**
* GInterfaceInitFunc:
* @g_iface: The interface structure to initialize.
* @iface_data: The @interface_data supplied via the #GInterfaceInfo structure.
*
* A callback function used by the type system to initialize a new
* interface. This function should initialize all internal data and
* allocate any resources required by the interface.
*/
typedef void (*GInterfaceInitFunc) (gpointer g_iface,
gpointer iface_data);
/**
* GInterfaceFinalizeFunc:
* @g_iface: The interface structure to finalize.
* @iface_data: The @interface_data supplied via the #GInterfaceInfo structure.
*
* A callback function used by the type system to finalize an interface.
* This function should destroy any internal data and release any resources
* allocated by the corresponding GInterfaceInitFunc() function.
*/
typedef void (*GInterfaceFinalizeFunc) (gpointer g_iface,
gpointer iface_data);
/**
* GTypeClassCacheFunc:
* @cache_data: data that was given to the g_type_add_class_cache_func() call
* @g_class: The #GTypeClass structure which is unreferenced
*
* A callback function which is called when the reference count of a class
* drops to zero. It may use g_type_class_ref() to prevent the class from
* being freed. You should not call g_type_class_unref() from a
* #GTypeClassCacheFunc function to prevent infinite recursion, use
* g_type_class_unref_uncached() instead.
*
* The functions have to check the class id passed in to figure
* whether they actually want to cache the class of this type, since all
* classes are routed through the same #GTypeClassCacheFunc chain.
*
* Returns: %TRUE to stop further #GTypeClassCacheFunc<!-- -->s from being
* called, %FALSE to continue.
*/
typedef gboolean (*GTypeClassCacheFunc) (gpointer cache_data,
GTypeClass *g_class);
/**
* GTypeInterfaceCheckFunc:
* @check_data: data passed to g_type_add_interface_check().
* @g_iface: the interface that has been initialized
*
* A callback called after an interface vtable is initialized.
* See g_type_add_interface_check().
*
* Since: 2.4
*/
typedef void (*GTypeInterfaceCheckFunc) (gpointer check_data,
gpointer g_iface);
/**
* GTypeFundamentalFlags:
* @G_TYPE_FLAG_CLASSED: Indicates a classed type.
* @G_TYPE_FLAG_INSTANTIATABLE: Indicates an instantiable type (implies classed).
* @G_TYPE_FLAG_DERIVABLE: Indicates a flat derivable type.
* @G_TYPE_FLAG_DEEP_DERIVABLE: Indicates a deep derivable type (implies derivable).
*
* Bit masks used to check or determine specific characteristics of a
* fundamental type.
*/
typedef enum /*< skip >*/
{
G_TYPE_FLAG_CLASSED = (1 << 0),
G_TYPE_FLAG_INSTANTIATABLE = (1 << 1),
G_TYPE_FLAG_DERIVABLE = (1 << 2),
G_TYPE_FLAG_DEEP_DERIVABLE = (1 << 3)
} GTypeFundamentalFlags;
/**
* GTypeFlags:
* @G_TYPE_FLAG_ABSTRACT: Indicates an abstract type. No instances can be
* created for an abstract type.
* @G_TYPE_FLAG_VALUE_ABSTRACT: Indicates an abstract value type, i.e. a type
* that introduces a value table, but can't be used for
* g_value_init().
*
* Bit masks used to check or determine characteristics of a type.
*/
typedef enum /*< skip >*/
{
G_TYPE_FLAG_ABSTRACT = (1 << 4),
G_TYPE_FLAG_VALUE_ABSTRACT = (1 << 5)
} GTypeFlags;
/**
* GTypeInfo:
* @class_size: Size of the class structure (required for interface, classed and instantiatable types).
* @base_init: Location of the base initialization function (optional).
* @base_finalize: Location of the base finalization function (optional).
* @class_init: Location of the class initialization function for
* classed and instantiatable types. Location of the default vtable
* inititalization function for interface types. (optional) This function
* is used both to fill in virtual functions in the class or default vtable,
* and to do type-specific setup such as registering signals and object
* properties.
* @class_finalize: Location of the class finalization function for
* classed and instantiatable types. Location fo the default vtable
* finalization function for interface types. (optional)
* @class_data: User-supplied data passed to the class init/finalize functions.
* @instance_size: Size of the instance (object) structure (required for instantiatable types only).
* @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 <link linkend="glib-Memory-Slices">slice allocator</link> now.
* @instance_init: Location of the instance initialization function (optional, for instantiatable types only).
* @value_table: A #GTypeValueTable function table for generic handling of GValues of this type (usually only
* useful for fundamental types).
*
* This structure is used to provide the type system with the information
* required to initialize and destruct (finalize) a type's class and
* its instances.
* The initialized structure is passed to the g_type_register_static() function
* (or is copied into the provided #GTypeInfo structure in the
* g_type_plugin_complete_type_info()). The type system will perform a deep
* copy of this structure, so its memory does not need to be persistent
* across invocation of g_type_register_static().
*/
struct _GTypeInfo
{
/* interface types, classed types, instantiated types */
guint16 class_size;
GBaseInitFunc base_init;
GBaseFinalizeFunc base_finalize;
/* interface types, classed types, instantiated types */
GClassInitFunc class_init;
GClassFinalizeFunc class_finalize;
gconstpointer class_data;
/* instantiated types */
guint16 instance_size;
guint16 n_preallocs;
GInstanceInitFunc instance_init;
/* value handling */
const GTypeValueTable *value_table;
};
/**
* GTypeFundamentalInfo:
* @type_flags: #GTypeFundamentalFlags describing the characteristics of the fundamental type
*
* A structure that provides information to the type system which is
* used specifically for managing fundamental types.
*/
struct _GTypeFundamentalInfo
{
GTypeFundamentalFlags type_flags;
};
/**
* GInterfaceInfo:
* @interface_init: location of the interface initialization function
* @interface_finalize: location of the interface finalization function
* @interface_data: user-supplied data passed to the interface init/finalize functions
*
* A structure that provides information to the type system which is
* used specifically for managing interface types.
*/
struct _GInterfaceInfo
{
GInterfaceInitFunc interface_init;
GInterfaceFinalizeFunc interface_finalize;
gpointer interface_data;
};
/**
* GTypeValueTable:
* @value_init: Default initialize @values contents by poking values
* directly into the value->data array. The data array of
* the #GValue passed into this function was zero-filled
* with <function>memset()</function>, so no care has to
* be taken to free any
* old contents. E.g. for the implementation of a string
* value that may never be %NULL, the implementation might
* look like:
* |[
* value->data[0].v_pointer = g_strdup ("");
* ]|
* @value_free: Free any old contents that might be left in the
* data array of the passed in @value. No resources may
* remain allocated through the #GValue contents after
* this function returns. E.g. for our above string type:
* |[
* // only free strings without a specific flag for static storage
* if (!(value->data[1].v_uint & G_VALUE_NOCOPY_CONTENTS))
* g_free (value->data[0].v_pointer);
* ]|
* @value_copy: @dest_value is a #GValue with zero-filled data section
* and @src_value is a properly setup #GValue of same or
* derived type.
* The purpose of this function is to copy the contents of
* @src_value into @dest_value in a way, that even after
* @src_value has been freed, the contents of @dest_value
* remain valid. String type example:
* |[
* dest_value->data[0].v_pointer = g_strdup (src_value->data[0].v_pointer);
* ]|
* @value_peek_pointer: If the value contents fit into a pointer, such as objects
* or strings, return this pointer, so the caller can peek at
* the current contents. To extend on our above string example:
* |[
* return value->data[0].v_pointer;
* ]|
* @collect_format: A string format describing how to collect the contents of
* this value bit-by-bit. Each character in the format represents
* an argument to be collected, and the characters themselves indicate
* the type of the argument. Currently supported arguments are:
* <variablelist>
* <varlistentry><term /><listitem><para>
* 'i' - Integers. passed as collect_values[].v_int.
* </para></listitem></varlistentry>
* <varlistentry><term /><listitem><para>
* 'l' - Longs. passed as collect_values[].v_long.
* </para></listitem></varlistentry>
* <varlistentry><term /><listitem><para>
* 'd' - Doubles. passed as collect_values[].v_double.
* </para></listitem></varlistentry>
* <varlistentry><term /><listitem><para>
* 'p' - Pointers. passed as collect_values[].v_pointer.
* </para></listitem></varlistentry>
* </variablelist>
* It should be noted that for variable argument list construction,
* ANSI C promotes every type smaller than an integer to an int, and
* floats to doubles. So for collection of short int or char, 'i'
* needs to be used, and for collection of floats 'd'.
* @collect_value: The collect_value() function is responsible for converting the
* values collected from a variable argument list into contents
* suitable for storage in a GValue. This function should setup
* @value similar to value_init(); e.g. for a string value that
* does not allow %NULL pointers, it needs to either spew an error,
* or do an implicit conversion by storing an empty string.
* The @value passed in to this function has a zero-filled data
* array, so just like for value_init() it is guaranteed to not
* contain any old contents that might need freeing.
* @n_collect_values is exactly the string length of @collect_format,
* and @collect_values is an array of unions #GTypeCValue with
* length @n_collect_values, containing the collected values
* according to @collect_format.
* @collect_flags is an argument provided as a hint by the caller.
* It may contain the flag %G_VALUE_NOCOPY_CONTENTS indicating,
* that the collected value contents may be considered "static"
* for the duration of the @value lifetime.
* Thus an extra copy of the contents stored in @collect_values is
* not required for assignment to @value.
* For our above string example, we continue with:
* |[
* if (!collect_values[0].v_pointer)
* value->data[0].v_pointer = g_strdup ("");
* else if (collect_flags & G_VALUE_NOCOPY_CONTENTS)
* {
* value->data[0].v_pointer = collect_values[0].v_pointer;
* // keep a flag for the value_free() implementation to not free this string
* value->data[1].v_uint = G_VALUE_NOCOPY_CONTENTS;
* }
* else
* value->data[0].v_pointer = g_strdup (collect_values[0].v_pointer);
* return NULL;
* ]|
* It should be noted, that it is generally a bad idea to follow the
* #G_VALUE_NOCOPY_CONTENTS hint for reference counted types. Due to
* reentrancy requirements and reference count assertions performed
* by the #GSignal code, reference counts should always be incremented
* for reference counted contents stored in the value->data array.
* To deviate from our string example for a moment, and taking a look
* at an exemplary implementation for collect_value() of #GObject:
* |[
* if (collect_values[0].v_pointer)
* {
* GObject *object = G_OBJECT (collect_values[0].v_pointer);
* // never honour G_VALUE_NOCOPY_CONTENTS for ref-counted types
* value->data[0].v_pointer = g_object_ref (object);
* return NULL;
* }
* else
* return g_strdup_printf ("Object passed as invalid NULL pointer");
* }
* ]|
* The reference count for valid objects is always incremented,
* regardless of @collect_flags. For invalid objects, the example
* returns a newly allocated string without altering @value.
* Upon success, collect_value() needs to return %NULL. If, however,
* an error condition occurred, collect_value() may spew an
* error by returning a newly allocated non-%NULL string, giving
* a suitable description of the error condition.
* The calling code makes no assumptions about the @value
* contents being valid upon error returns, @value
* is simply thrown away without further freeing. As such, it is
* a good idea to not allocate #GValue contents, prior to returning
* an error, however, collect_values() is not obliged to return
* a correctly setup @value for error returns, simply because
* any non-%NULL return is considered a fatal condition so further
* program behaviour is undefined.
* @lcopy_format: Format description of the arguments to collect for @lcopy_value,
* analogous to @collect_format. Usually, @lcopy_format string consists
* only of 'p's to provide lcopy_value() with pointers to storage locations.
* @lcopy_value: This function is responsible for storing the @value contents into
* arguments passed through a variable argument list which got
* collected into @collect_values according to @lcopy_format.
* @n_collect_values equals the string length of @lcopy_format,
* and @collect_flags may contain %G_VALUE_NOCOPY_CONTENTS.
* In contrast to collect_value(), lcopy_value() is obliged to
* always properly support %G_VALUE_NOCOPY_CONTENTS.
* Similar to collect_value() the function may prematurely abort
* by returning a newly allocated string describing an error condition.
* To complete the string example:
* |[
* gchar **string_p = collect_values[0].v_pointer;
* if (!string_p)
* return g_strdup_printf ("string location passed as NULL");
* if (collect_flags & G_VALUE_NOCOPY_CONTENTS)
* *string_p = value->data[0].v_pointer;
* else
* *string_p = g_strdup (value->data[0].v_pointer);
* ]|
* And an illustrative version of lcopy_value() for
* reference-counted types:
* |[
* GObject **object_p = collect_values[0].v_pointer;
* if (!object_p)
* return g_strdup_printf ("object location passed as NULL");
* if (!value->data[0].v_pointer)
* *object_p = NULL;
* else if (collect_flags & G_VALUE_NOCOPY_CONTENTS) /&ast; always honour &ast;/
* *object_p = value->data[0].v_pointer;
* else
* *object_p = g_object_ref (value->data[0].v_pointer);
* return NULL;
* ]|
*
* The #GTypeValueTable provides the functions required by the #GValue implementation,
* to serve as a container for values of a type.
*/
struct _GTypeValueTable
{
void (*value_init) (GValue *value);
void (*value_free) (GValue *value);
void (*value_copy) (const GValue *src_value,
GValue *dest_value);
/* varargs functionality (optional) */
gpointer (*value_peek_pointer) (const GValue *value);
gchar *collect_format;
gchar* (*collect_value) (GValue *value,
guint n_collect_values,
GTypeCValue *collect_values,
guint collect_flags);
gchar *lcopy_format;
gchar* (*lcopy_value) (const GValue *value,
guint n_collect_values,
GTypeCValue *collect_values,
guint collect_flags);
};
GType g_type_register_static (GType parent_type,
const gchar *type_name,
const GTypeInfo *info,
GTypeFlags flags);
GType g_type_register_static_simple (GType parent_type,
const gchar *type_name,
guint class_size,
GClassInitFunc class_init,
guint instance_size,
GInstanceInitFunc instance_init,
GTypeFlags flags);
GType g_type_register_dynamic (GType parent_type,
const gchar *type_name,
GTypePlugin *plugin,
GTypeFlags flags);
GType g_type_register_fundamental (GType type_id,
const gchar *type_name,
const GTypeInfo *info,
const GTypeFundamentalInfo *finfo,
GTypeFlags flags);
void g_type_add_interface_static (GType instance_type,
GType interface_type,
const GInterfaceInfo *info);
void g_type_add_interface_dynamic (GType instance_type,
GType interface_type,
GTypePlugin *plugin);
void g_type_interface_add_prerequisite (GType interface_type,
GType prerequisite_type);
GType*g_type_interface_prerequisites (GType interface_type,
guint *n_prerequisites);
void g_type_class_add_private (gpointer g_class,
gsize private_size);
gpointer g_type_instance_get_private (GTypeInstance *instance,
GType private_type);
void g_type_add_class_private (GType class_type,
gsize private_size);
gpointer g_type_class_get_private (GTypeClass *klass,
GType private_type);
/* --- GType boilerplate --- */
/**
* G_DEFINE_TYPE:
* @TN: The name of the new type, in Camel case.
* @t_n: The name of the new type, in lowercase, with words
* separated by '_'.
* @T_P: The #GType of the parent type.
*
* A convenience macro for type implementations, which declares a
* class initialization function, an instance initialization function (see #GTypeInfo for information about
* these) and a static variable named @t_n<!-- -->_parent_class pointing to the parent class. Furthermore, it defines
* a *_get_type() function. See G_DEFINE_TYPE_EXTENDED() for an example.
*
* Since: 2.4
*/
#define G_DEFINE_TYPE(TN, t_n, T_P) G_DEFINE_TYPE_EXTENDED (TN, t_n, T_P, 0, {})
/**
* G_DEFINE_TYPE_WITH_CODE:
* @TN: The name of the new type, in Camel case.
* @t_n: The name of the new type in lowercase, with words separated by '_'.
* @T_P: The #GType of the parent type.
* @_C_: Custom code that gets inserted in the *_get_type() function.
*
* A convenience macro for type implementations.
* Similar to G_DEFINE_TYPE(), but allows you to insert custom code into the
* *_get_type() function, e.g. interface implementations via G_IMPLEMENT_INTERFACE().
* See G_DEFINE_TYPE_EXTENDED() for an example.
*
* Since: 2.4
*/
#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()
/**
* G_DEFINE_ABSTRACT_TYPE:
* @TN: The name of the new type, in Camel case.
* @t_n: The name of the new type, in lowercase, with words
* separated by '_'.
* @T_P: The #GType of the parent type.
*
* A convenience macro for type implementations.
* Similar to G_DEFINE_TYPE(), but defines an abstract type.
* See G_DEFINE_TYPE_EXTENDED() for an example.
*
* Since: 2.4
*/
#define G_DEFINE_ABSTRACT_TYPE(TN, t_n, T_P) G_DEFINE_TYPE_EXTENDED (TN, t_n, T_P, G_TYPE_FLAG_ABSTRACT, {})
/**
* G_DEFINE_ABSTRACT_TYPE_WITH_CODE:
* @TN: The name of the new type, in Camel case.
* @t_n: The name of the new type, in lowercase, with words
* separated by '_'.
* @T_P: The #GType of the parent type.
* @_C_: Custom code that gets inserted in the @type_name_get_type() function.
*
* A convenience macro for type implementations.
* Similar to G_DEFINE_TYPE_WITH_CODE(), but defines an abstract type and allows you to
* insert custom code into the *_get_type() function, e.g. interface implementations
* via G_IMPLEMENT_INTERFACE(). See G_DEFINE_TYPE_EXTENDED() for an example.
*
* Since: 2.4
*/
#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()
/**
* G_DEFINE_TYPE_EXTENDED:
* @TN: The name of the new type, in Camel case.
* @t_n: The name of the new type, in lowercase, with words
* separated by '_'.
* @T_P: The #GType of the parent type.
* @_f_: #GTypeFlags to pass to g_type_register_static()
* @_C_: Custom code that gets inserted in the *_get_type() function.
*
* The most general convenience macro for type implementations, on which
* G_DEFINE_TYPE(), etc are based.
*
* |[
* G_DEFINE_TYPE_EXTENDED (GtkGadget,
* gtk_gadget,
* GTK_TYPE_WIDGET,
* 0,
* G_IMPLEMENT_INTERFACE (TYPE_GIZMO,
* gtk_gadget_gizmo_init));
* ]|
* expands to
* |[
* static void gtk_gadget_init (GtkGadget *self);
* static void gtk_gadget_class_init (GtkGadgetClass *klass);
* static gpointer gtk_gadget_parent_class = NULL;
* static void gtk_gadget_class_intern_init (gpointer klass)
* {
* gtk_gadget_parent_class = g_type_class_peek_parent (klass);
* gtk_gadget_class_init ((GtkGadgetClass*) klass);
* }
*
* GType
* gtk_gadget_get_type (void)
* {
* static volatile gsize g_define_type_id__volatile = 0;
* if (g_once_init_enter (&g_define_type_id__volatile))
* {
* GType g_define_type_id =
* g_type_register_static_simple (GTK_TYPE_WIDGET,
* g_intern_static_string ("GtkGadget"),
* sizeof (GtkGadgetClass),
* (GClassInitFunc) gtk_gadget_class_intern_init,
* sizeof (GtkGadget),
* (GInstanceInitFunc) gtk_gadget_init,
* (GTypeFlags) flags);
* {
* static const GInterfaceInfo g_implement_interface_info = {
* (GInterfaceInitFunc) gtk_gadget_gizmo_init
* };
* g_type_add_interface_static (g_define_type_id, TYPE_GIZMO, &g_implement_interface_info);
* }
* g_once_init_leave (&g_define_type_id__volatile, g_define_type_id);
* }
* return g_define_type_id__volatile;
* }
* ]|
* The only pieces which have to be manually provided are the definitions of
* the instance and class structure and the definitions of the instance and
* class init functions.
*
* Since: 2.4
*/
#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()
/**
* G_DEFINE_INTERFACE:
* @TN: The name of the new type, in Camel case.
* @t_n: The name of the new type, in lowercase, with words separated by '_'.
* @T_P: The #GType of the prerequisite type for the interface, or 0
* (%G_TYPE_INVALID) for no prerequisite type.
*
* A convenience macro for #GTypeInterface definitions, which declares
* a default vtable initialization function and defines a *_get_type()
* function.
*
* The macro expects the interface initialization function to have the
* name <literal>t_n ## _default_init</literal>, and the interface
* structure to have the name <literal>TN ## Interface</literal>.
*
* Since: 2.24
*/
#define G_DEFINE_INTERFACE(TN, t_n, T_P) G_DEFINE_INTERFACE_WITH_CODE(TN, t_n, T_P, ;)
/**
* G_DEFINE_INTERFACE_WITH_CODE:
* @TN: The name of the new type, in Camel case.
* @t_n: The name of the new type, in lowercase, with words separated by '_'.
* @T_P: The #GType of the prerequisite type for the interface, or 0
* (%G_TYPE_INVALID) for no prerequisite type.
* @_C_: Custom code that gets inserted in the *_get_type() function.
*
* A convenience macro for #GTypeInterface definitions. Similar to
* G_DEFINE_INTERFACE(), but allows you to insert custom code into the
* *_get_type() function, e.g. additional interface implementations
* via G_IMPLEMENT_INTERFACE(), or additional prerequisite types. See
* G_DEFINE_TYPE_EXTENDED() for a similar example using
* G_DEFINE_TYPE_WITH_CODE().
*
* Since: 2.24
*/
#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()
/**
* G_IMPLEMENT_INTERFACE:
* @TYPE_IFACE: The #GType of the interface to add
* @iface_init: The interface init function
*
* A convenience macro to ease interface addition in the @_C_ section
* of G_DEFINE_TYPE_WITH_CODE() or G_DEFINE_ABSTRACT_TYPE_WITH_CODE().
* See G_DEFINE_TYPE_EXTENDED() for an example.
*
* Note that this macro can only be used together with the G_DEFINE_TYPE_*
* macros, since it depends on variable names from those macros.
*
* Since: 2.4
*/
#define G_IMPLEMENT_INTERFACE(TYPE_IFACE, iface_init) { \
const GInterfaceInfo g_implement_interface_info = { \
(GInterfaceInitFunc) iface_init, NULL, NULL \
}; \
g_type_add_interface_static (g_define_type_id, TYPE_IFACE, &g_implement_interface_info); \
}
#define _G_DEFINE_TYPE_EXTENDED_BEGIN(TypeName, type_name, TYPE_PARENT, flags) \
\
static void type_name##_init (TypeName *self); \
static void type_name##_class_init (TypeName##Class *klass); \
static gpointer type_name##_parent_class = NULL; \
static void type_name##_class_intern_init (gpointer klass) \
{ \
type_name##_parent_class = g_type_class_peek_parent (klass); \
type_name##_class_init ((TypeName##Class*) klass); \
} \
\
GType \
type_name##_get_type (void) \
{ \
static volatile gsize g_define_type_id__volatile = 0; \
if (g_once_init_enter (&g_define_type_id__volatile)) \
{ \
GType g_define_type_id = \
g_type_register_static_simple (TYPE_PARENT, \
g_intern_static_string (#TypeName), \
sizeof (TypeName##Class), \
(GClassInitFunc) type_name##_class_intern_init, \
sizeof (TypeName), \
(GInstanceInitFunc) type_name##_init, \
(GTypeFlags) flags); \
{ /* custom code follows */
#define _G_DEFINE_TYPE_EXTENDED_END() \
/* following custom code */ \
} \
g_once_init_leave (&g_define_type_id__volatile, g_define_type_id); \
} \
return g_define_type_id__volatile; \
} /* closes type_name##_get_type() */
#define _G_DEFINE_INTERFACE_EXTENDED_BEGIN(TypeName, type_name, TYPE_PREREQ) \
\
static void type_name##_default_init (TypeName##Interface *klass); \
\
GType \
type_name##_get_type (void) \
{ \
static volatile gsize g_define_type_id__volatile = 0; \
if (g_once_init_enter (&g_define_type_id__volatile)) \
{ \
GType g_define_type_id = \
g_type_register_static_simple (G_TYPE_INTERFACE, \
g_intern_static_string (#TypeName), \
sizeof (TypeName##Interface), \
(GClassInitFunc)type_name##_default_init, \
0, \
(GInstanceInitFunc)NULL, \
(GTypeFlags) 0); \
if (TYPE_PREREQ) \
g_type_interface_add_prerequisite (g_define_type_id, TYPE_PREREQ); \
{ /* custom code follows */
#define _G_DEFINE_INTERFACE_EXTENDED_END() \
/* following custom code */ \
} \
g_once_init_leave (&g_define_type_id__volatile, g_define_type_id); \
} \
return g_define_type_id__volatile; \
} /* closes type_name##_get_type() */
/**
* G_DEFINE_BOXED_TYPE:
* @TypeName: The name of the new type, in Camel case.
* @type_name: The name of the new type, in lowercase, with words
* separated by '_'.
* @copy_func: the #GBoxedCopyFunc for the new type
* @free_func: the #GBoxedFreeFunc for the new type
*
* A convenience macro for boxed type implementations, which defines a
* type_name_get_type() function registering the boxed type.
*
* Since: 2.26
*/
#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, {})
/**
* G_DEFINE_BOXED_TYPE_WITH_CODE:
* @TypeName: The name of the new type, in Camel case.
* @type_name: The name of the new type, in lowercase, with words
* separated by '_'.
* @copy_func: the #GBoxedCopyFunc for the new type
* @free_func: the #GBoxedFreeFunc for the new type
* @_C_: Custom code that gets inserted in the *_get_type() function.
*
* A convenience macro for boxed type implementations.
* Similar to G_DEFINE_BOXED_TYPE(), but allows to insert custom code into the
* type_name_get_type() function, e.g. to register value transformations with
* g_value_register_transform_func().
*
* Since: 2.26
*/
#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()
#if !defined (__cplusplus) && (__GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 7))
#define _G_DEFINE_BOXED_TYPE_BEGIN(TypeName, type_name, copy_func, free_func) \
GType \
type_name##_get_type (void) \
{ \
static volatile gsize g_define_type_id__volatile = 0; \
if (g_once_init_enter (&g_define_type_id__volatile)) \
{ \
GType (* _g_register_boxed) \
(const gchar *, \
union \
{ \
TypeName * (*do_copy_type) (TypeName *); \
TypeName * (*do_const_copy_type) (const TypeName *); \
GBoxedCopyFunc do_copy_boxed; \
} __attribute__((__transparent_union__)), \
union \
{ \
void (* do_free_type) (TypeName *); \
GBoxedFreeFunc do_free_boxed; \
} __attribute__((__transparent_union__)) \
) = g_boxed_type_register_static; \
GType g_define_type_id = \
_g_register_boxed (g_intern_static_string (#TypeName), copy_func, free_func); \
{ /* custom code follows */
#else
#define _G_DEFINE_BOXED_TYPE_BEGIN(TypeName, type_name, copy_func, free_func) \
GType \
type_name##_get_type (void) \
{ \
static volatile gsize g_define_type_id__volatile = 0; \
if (g_once_init_enter (&g_define_type_id__volatile)) \
{ \
GType g_define_type_id = \
g_boxed_type_register_static (g_intern_static_string (#TypeName), \
(GBoxedCopyFunc) copy_func, \
(GBoxedFreeFunc) free_func); \
{ /* custom code follows */
#endif /* __GNUC__ */
/**
* G_DEFINE_POINTER_TYPE:
* @TypeName: The name of the new type, in Camel case.
* @type_name: The name of the new type, in lowercase, with words
* separated by '_'.
*
* A convenience macro for pointer type implementations, which defines a
* type_name_get_type() function registering the pointer type.
*
* Since: 2.26
*/
#define G_DEFINE_POINTER_TYPE(TypeName, type_name) G_DEFINE_POINTER_TYPE_WITH_CODE (TypeName, type_name, {})
/**
* G_DEFINE_POINTER_TYPE_WITH_CODE:
* @TypeName: The name of the new type, in Camel case.
* @type_name: The name of the new type, in lowercase, with words
* separated by '_'.
* @_C_: Custom code that gets inserted in the *_get_type() function.
*
* A convenience macro for pointer type implementations.
* Similar to G_DEFINE_POINTER_TYPE(), but allows to insert custom code into the
* type_name_get_type() function.
*
* Since: 2.26
*/
#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()
#define _G_DEFINE_POINTER_TYPE_BEGIN(TypeName, type_name) \
GType \
type_name##_get_type (void) \
{ \
static volatile gsize g_define_type_id__volatile = 0; \
if (g_once_init_enter (&g_define_type_id__volatile)) \
{ \
GType g_define_type_id = \
g_pointer_type_register_static (g_intern_static_string (#TypeName)); \
{ /* custom code follows */
/* --- protected (for fundamental type implementations) --- */
GTypePlugin* g_type_get_plugin (GType type);
GTypePlugin* g_type_interface_get_plugin (GType instance_type,
GType interface_type);
GType g_type_fundamental_next (void);
GType g_type_fundamental (GType type_id);
GTypeInstance* g_type_create_instance (GType type);
void g_type_free_instance (GTypeInstance *instance);
void g_type_add_class_cache_func (gpointer cache_data,
GTypeClassCacheFunc cache_func);
void g_type_remove_class_cache_func (gpointer cache_data,
GTypeClassCacheFunc cache_func);
void g_type_class_unref_uncached (gpointer g_class);
void g_type_add_interface_check (gpointer check_data,
GTypeInterfaceCheckFunc check_func);
void g_type_remove_interface_check (gpointer check_data,
GTypeInterfaceCheckFunc check_func);
GTypeValueTable* g_type_value_table_peek (GType type);
/*< private >*/
gboolean g_type_check_instance (GTypeInstance *instance) G_GNUC_PURE;
GTypeInstance* g_type_check_instance_cast (GTypeInstance *instance,
GType iface_type);
gboolean g_type_check_instance_is_a (GTypeInstance *instance,
GType iface_type) G_GNUC_PURE;
GTypeClass* g_type_check_class_cast (GTypeClass *g_class,
GType is_a_type);
gboolean g_type_check_class_is_a (GTypeClass *g_class,
GType is_a_type) G_GNUC_PURE;
gboolean g_type_check_is_value_type (GType type) G_GNUC_CONST;
gboolean g_type_check_value (GValue *value) G_GNUC_PURE;
gboolean g_type_check_value_holds (GValue *value,
GType type) G_GNUC_PURE;
gboolean g_type_test_flags (GType type,
guint flags) G_GNUC_CONST;
/* --- debugging functions --- */
const gchar * g_type_name_from_instance (GTypeInstance *instance);
const gchar * g_type_name_from_class (GTypeClass *g_class);
/* --- implementation bits --- */
#ifndef G_DISABLE_CAST_CHECKS
# define _G_TYPE_CIC(ip, gt, ct) \
((ct*) g_type_check_instance_cast ((GTypeInstance*) ip, gt))
# define _G_TYPE_CCC(cp, gt, ct) \
((ct*) g_type_check_class_cast ((GTypeClass*) cp, gt))
#else /* G_DISABLE_CAST_CHECKS */
# define _G_TYPE_CIC(ip, gt, ct) ((ct*) ip)
# define _G_TYPE_CCC(cp, gt, ct) ((ct*) cp)
#endif /* G_DISABLE_CAST_CHECKS */
#define _G_TYPE_CHI(ip) (g_type_check_instance ((GTypeInstance*) ip))
#define _G_TYPE_CHV(vl) (g_type_check_value ((GValue*) vl))
#define _G_TYPE_IGC(ip, gt, ct) ((ct*) (((GTypeInstance*) ip)->g_class))
#define _G_TYPE_IGI(ip, gt, ct) ((ct*) g_type_interface_peek (((GTypeInstance*) ip)->g_class, gt))
#ifdef __GNUC__
# define _G_TYPE_CIT(ip, gt) (G_GNUC_EXTENSION ({ \
GTypeInstance *__inst = (GTypeInstance*) ip; GType __t = gt; gboolean __r; \
if (!__inst) \
__r = FALSE; \
else if (__inst->g_class && __inst->g_class->g_type == __t) \
__r = TRUE; \
else \
__r = g_type_check_instance_is_a (__inst, __t); \
__r; \
}))
# define _G_TYPE_CCT(cp, gt) (G_GNUC_EXTENSION ({ \
GTypeClass *__class = (GTypeClass*) cp; GType __t = gt; gboolean __r; \
if (!__class) \
__r = FALSE; \
else if (__class->g_type == __t) \
__r = TRUE; \
else \
__r = g_type_check_class_is_a (__class, __t); \
__r; \
}))
# define _G_TYPE_CVH(vl, gt) (G_GNUC_EXTENSION ({ \
GValue *__val = (GValue*) vl; GType __t = gt; gboolean __r; \
if (!__val) \
__r = FALSE; \
else if (__val->g_type == __t) \
__r = TRUE; \
else \
__r = g_type_check_value_holds (__val, __t); \
__r; \
}))
#else /* !__GNUC__ */
# define _G_TYPE_CIT(ip, gt) (g_type_check_instance_is_a ((GTypeInstance*) ip, gt))
# define _G_TYPE_CCT(cp, gt) (g_type_check_class_is_a ((GTypeClass*) cp, gt))
# define _G_TYPE_CVH(vl, gt) (g_type_check_value_holds ((GValue*) vl, gt))
#endif /* !__GNUC__ */
/**
* G_TYPE_FLAG_RESERVED_ID_BIT:
*
* A bit in the type number that's supposed to be left untouched.
*/
#define G_TYPE_FLAG_RESERVED_ID_BIT ((GType) (1 << 0))
extern GTypeDebugFlags _g_type_debug_flags;
G_END_DECLS
#endif /* __G_TYPE_H__ */
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