glib/gobject/gtype.h

/* GObject - GLib Type, Object, Parameter and Signal Library
 * Copyright (C) 1998, 1999, 2000 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.
 */
#ifndef __G_TYPE_H__
#define __G_TYPE_H__

extern const char *g_log_domain_gobject;
#include        <glib.h>


#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */


/* Basic Type Macros
 */
#define G_TYPE_FUNDAMENTAL(type)                ((type) & 0xff)
#define	G_TYPE_FUNDAMENTAL_MAX			(0xff)
#define G_TYPE_DERIVE_ID(ptype, branch_seqno)   (G_TYPE_FUNDAMENTAL (ptype) | ((branch_seqno) << 8))
#define G_TYPE_BRANCH_SEQNO(type)               ((type) >> 8)
#define G_TYPE_FUNDAMENTAL_LAST                 ((GType) g_type_fundamental_last ())


/* predefined fundamental and derived types
 */
typedef enum    /*< skip >*/
{
  /* standard types, introduced by g_type_init() */
  G_TYPE_INVALID,
  G_TYPE_NONE,
  G_TYPE_INTERFACE,

  /* GLib type ids */
  G_TYPE_CHAR,
  G_TYPE_UCHAR,
  G_TYPE_BOOLEAN,
  G_TYPE_INT,
  G_TYPE_UINT,
  G_TYPE_LONG,
  G_TYPE_ULONG,
  G_TYPE_ENUM,
  G_TYPE_FLAGS,
  G_TYPE_FLOAT,
  G_TYPE_DOUBLE,
  G_TYPE_STRING,
  G_TYPE_PARAM,
  G_TYPE_BOXED,
  G_TYPE_POINTER,
  G_TYPE_OBJECT,

  /* the following reserved ids should vanish soon */
  G_TYPE_GTK_SIGNAL,

  /* reserved fundamental type ids,
   * mail gtk-devel-list@redhat.com for reservations
   */
  G_TYPE_BSE_PROCEDURE,
  G_TYPE_BSE_TIME,
  G_TYPE_BSE_NOTE,
  G_TYPE_BSE_DOTS,
  G_TYPE_GLE_GOBJECT,

  G_TYPE_LAST_RESERVED_FUNDAMENTAL,

  /* derived type ids */
  /* FIXME: G_TYPE_PARAM_INTERFACE */
  G_TYPE_PARAM_CHAR             = G_TYPE_DERIVE_ID (G_TYPE_PARAM, 1),
  G_TYPE_PARAM_UCHAR            = G_TYPE_DERIVE_ID (G_TYPE_PARAM, 2),
  G_TYPE_PARAM_BOOLEAN          = G_TYPE_DERIVE_ID (G_TYPE_PARAM, 3),
  G_TYPE_PARAM_INT              = G_TYPE_DERIVE_ID (G_TYPE_PARAM, 4),
  G_TYPE_PARAM_UINT             = G_TYPE_DERIVE_ID (G_TYPE_PARAM, 5),
  G_TYPE_PARAM_LONG             = G_TYPE_DERIVE_ID (G_TYPE_PARAM, 6),
  G_TYPE_PARAM_ULONG            = G_TYPE_DERIVE_ID (G_TYPE_PARAM, 7),
  G_TYPE_PARAM_ENUM             = G_TYPE_DERIVE_ID (G_TYPE_PARAM, 8),
  G_TYPE_PARAM_FLAGS            = G_TYPE_DERIVE_ID (G_TYPE_PARAM, 9),
  G_TYPE_PARAM_FLOAT            = G_TYPE_DERIVE_ID (G_TYPE_PARAM, 10),
  G_TYPE_PARAM_DOUBLE           = G_TYPE_DERIVE_ID (G_TYPE_PARAM, 11),
  G_TYPE_PARAM_STRING           = G_TYPE_DERIVE_ID (G_TYPE_PARAM, 12),
  /* FIXME: G_TYPE_PARAM_PARAM */
  G_TYPE_PARAM_OBJECT           = G_TYPE_DERIVE_ID (G_TYPE_PARAM, 13)
} GTypeFundamentals;


/* Type Checking Macros
 */
#define G_TYPE_IS_FUNDAMENTAL(type)             (G_TYPE_BRANCH_SEQNO (type) == 0)
#define G_TYPE_IS_INTERFACE(type)               (G_TYPE_FUNDAMENTAL (type) == G_TYPE_INTERFACE)
#define G_TYPE_IS_CLASSED(type)                 (g_type_check_flags ((type), G_TYPE_FLAG_CLASSED))
#define G_TYPE_IS_INSTANTIATABLE(type)          (g_type_check_flags ((type), G_TYPE_FLAG_INSTANTIATABLE))
#define G_TYPE_IS_DERIVABLE(type)               (g_type_check_flags ((type), G_TYPE_FLAG_DERIVABLE))
#define G_TYPE_IS_DEEP_DERIVABLE(type)          (g_type_check_flags ((type), G_TYPE_FLAG_DEEP_DERIVABLE))
#define G_TYPE_IS_ABSTRACT(type)                (g_type_check_flags ((type), G_TYPE_FLAG_ABSTRACT))
#define G_TYPE_IS_PARAM(type)                   (G_TYPE_FUNDAMENTAL (type) == G_TYPE_PARAM)
#define G_TYPE_IS_VALUE_TYPE(type)              (g_type_value_table_peek (type) != NULL)


/* Typedefs
 */
typedef guint32                         GType;
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;


/* Basic Type Structures
 */
struct _GTypeClass
{
  /*< private >*/
  GType g_type;
};
struct _GTypeInstance
{
  /*< private >*/
  GTypeClass *g_class;
};
struct _GTypeInterface
{
  /*< private >*/
  GType g_type;         /* iface type */
  GType g_instance_type;
};


/* Casts, checks and accessors for structured types
 * usage of these macros is reserved to type implementations only
 * 
 */
/*< protected >*/
#define G_TYPE_CHECK_INSTANCE(instance)				(_G_TYPE_CHI ((GTypeInstance*) (instance)))
#define G_TYPE_CHECK_INSTANCE_CAST(instance, g_type, c_type)    (_G_TYPE_CIC ((instance), (g_type), c_type))
#define G_TYPE_CHECK_INSTANCE_TYPE(instance, g_type)            (_G_TYPE_CIT ((instance), (g_type)))
#define G_TYPE_INSTANCE_GET_CLASS(instance, g_type, c_type)     (_G_TYPE_IGC ((instance), (g_type), c_type))
#define G_TYPE_INSTANCE_GET_INTERFACE(instance, g_type, c_type) (_G_TYPE_IGI ((instance), (g_type), c_type))
#define G_TYPE_CHECK_CLASS_CAST(g_class, g_type, c_type)        (_G_TYPE_CCC ((g_class), (g_type), c_type))
#define G_TYPE_CHECK_CLASS_TYPE(g_class, g_type)                (_G_TYPE_CCT ((g_class), (g_type)))
#define G_TYPE_CHECK_VALUE(value)				(_G_TYPE_CHV ((value)))
#define G_TYPE_CHECK_VALUE_TYPE(value, g_type)			(_G_TYPE_CVT ((value), (g_type)))
#define G_TYPE_FROM_INSTANCE(instance)                          (G_TYPE_FROM_CLASS (((GTypeInstance*) (instance))->g_class))
#define G_TYPE_FROM_CLASS(g_class)                              (((GTypeClass*) (g_class))->g_type)
#define G_TYPE_FROM_INTERFACE(g_iface)                          (((GTypeInterface*) (g_iface))->g_type)


/* --- prototypes --- */
void     g_type_init                    (void);
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);
GType    g_type_next_base               (GType                   type,
                                         GType                   base_type);
gboolean g_type_is_a                    (GType                   type,
                                         GType                   is_a_type);
gboolean g_type_conforms_to             (GType                   type,
                                         GType                   iface_type);
guint    g_type_fundamental_branch_last (GType                   type);
gpointer g_type_class_ref               (GType                   type);
gpointer g_type_class_peek              (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);
/* 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);
                                          

/* --- type registration --- */
typedef void   (*GBaseInitFunc)              (gpointer         g_class);
typedef void   (*GBaseFinalizeFunc)          (gpointer         g_class);
typedef void   (*GClassInitFunc)             (gpointer         g_class,
					      gpointer         class_data);
typedef void   (*GClassFinalizeFunc)         (gpointer         g_class,
					      gpointer         class_data);
typedef void   (*GInstanceInitFunc)          (GTypeInstance   *instance,
					      gpointer         g_class);
typedef void   (*GInterfaceInitFunc)         (gpointer         g_iface,
					      gpointer         iface_data);
typedef void   (*GInterfaceFinalizeFunc)     (gpointer         g_iface,
					      gpointer         iface_data);
typedef gboolean (*GTypeClassCacheFunc)	     (gpointer	       cache_data,
					      GTypeClass      *g_class);
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;
typedef enum    /*< skip >*/
{
  G_TYPE_FLAG_ABSTRACT          = (1 << 4)
} GTypeFlags;
struct _GTypeInfo
{
  /* interface types, classed types, instantiated types */
  guint16                class_size;

  GBaseInitFunc          base_init;
  GBaseFinalizeFunc      base_finalize;

  /* 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;
};
struct _GTypeFundamentalInfo
{
  GTypeFundamentalFlags  type_flags;
};
struct _GInterfaceInfo
{
  GInterfaceInitFunc     interface_init;
  GInterfaceFinalizeFunc interface_finalize;
  gpointer               interface_data;
};
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);
  guint      collect_type;
  gchar*   (*collect_value)      (GValue       *value,
				  guint         nth_value,
				  GType        *collect_type,
				  GTypeCValue  *collect_value);
  guint      lcopy_type;
  gchar*   (*lcopy_value)        (const GValue *value,
				  guint         nth_value,
				  GType        *collect_type,
				  GTypeCValue  *collect_value);
};
GType g_type_register_static       (GType                       parent_type,
                                    const gchar                *type_name,
                                    const GTypeInfo            *info,
				    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);


/* --- protected (for fundamental type implementations) --- */
GTypePlugin*	 g_type_get_plugin		(GType		     type);
GType		 g_type_fundamental_last	(void);
gboolean         g_type_check_flags             (GType               type,
						 guint               flags);
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);


/*< private >*/
GTypeClass*      g_type_check_class_cast        (GTypeClass         *g_class,
						 GType               is_a_type);
gboolean         g_type_class_is_a              (GTypeClass         *g_class,
						 GType               is_a_type);
GTypeInstance*   g_type_check_instance_cast     (GTypeInstance      *instance,
						 GType               iface_type);
gboolean         g_type_instance_conforms_to    (GTypeInstance      *instance,
						 GType               iface_type);
gboolean	 g_type_check_value             (GValue		    *value);
gboolean	 g_type_value_conforms_to       (GValue		    *value,
						 GType		     type);
gboolean	 g_type_check_instance          (GTypeInstance      *instance);
GTypeValueTable* g_type_value_table_peek        (GType		     type);


#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_CIT(ip, gt)             (g_type_instance_conforms_to ((GTypeInstance*) ip, gt))
#define _G_TYPE_CCT(cp, gt)             (g_type_class_is_a ((GTypeClass*) cp, gt))
#define _G_TYPE_CVT(vl, gt)             (g_type_value_conforms_to ((GValue*) vl, gt))
#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 __cplusplus
}
#endif /* __cplusplus */

#endif /* __G_TYPE_H__ */