glib/gobject/genums.h
Philip Withnall 41691cc4c8 Merge branch 'more-spdx' into 'main'
Add more SPDX license headers

See merge request GNOME/glib!2706
2022-07-05 11:06:49 +00:00

382 lines
11 KiB
C

/* GObject - GLib Type, Object, Parameter and Signal Library
* Copyright (C) 1998-1999, 2000-2001 Tim Janik and Red Hat, Inc.
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General
* Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __G_ENUMS_H__
#define __G_ENUMS_H__
#if !defined (__GLIB_GOBJECT_H_INSIDE__) && !defined (GOBJECT_COMPILATION)
#error "Only <glib-object.h> can be included directly."
#endif
#include <gobject/gtype.h>
G_BEGIN_DECLS
/* --- type macros --- */
/**
* G_TYPE_IS_ENUM:
* @type: a #GType ID.
*
* Checks whether @type "is a" %G_TYPE_ENUM.
*
* Returns: %TRUE if @type "is a" %G_TYPE_ENUM.
*/
#define G_TYPE_IS_ENUM(type) (G_TYPE_FUNDAMENTAL (type) == G_TYPE_ENUM)
/**
* G_ENUM_CLASS:
* @class: a valid #GEnumClass
*
* Casts a derived #GEnumClass structure into a #GEnumClass structure.
*/
#define G_ENUM_CLASS(class) (G_TYPE_CHECK_CLASS_CAST ((class), G_TYPE_ENUM, GEnumClass))
/**
* G_IS_ENUM_CLASS:
* @class: a #GEnumClass
*
* Checks whether @class "is a" valid #GEnumClass structure of type %G_TYPE_ENUM
* or derived.
*/
#define G_IS_ENUM_CLASS(class) (G_TYPE_CHECK_CLASS_TYPE ((class), G_TYPE_ENUM))
/**
* G_ENUM_CLASS_TYPE:
* @class: a #GEnumClass
*
* Get the type identifier from a given #GEnumClass structure.
*
* Returns: the #GType
*/
#define G_ENUM_CLASS_TYPE(class) (G_TYPE_FROM_CLASS (class))
/**
* G_ENUM_CLASS_TYPE_NAME:
* @class: a #GEnumClass
*
* Get the static type name from a given #GEnumClass structure.
*
* Returns: the type name.
*/
#define G_ENUM_CLASS_TYPE_NAME(class) (g_type_name (G_ENUM_CLASS_TYPE (class)))
/**
* G_TYPE_IS_FLAGS:
* @type: a #GType ID.
*
* Checks whether @type "is a" %G_TYPE_FLAGS.
*
* Returns: %TRUE if @type "is a" %G_TYPE_FLAGS.
*/
#define G_TYPE_IS_FLAGS(type) (G_TYPE_FUNDAMENTAL (type) == G_TYPE_FLAGS)
/**
* G_FLAGS_CLASS:
* @class: a valid #GFlagsClass
*
* Casts a derived #GFlagsClass structure into a #GFlagsClass structure.
*/
#define G_FLAGS_CLASS(class) (G_TYPE_CHECK_CLASS_CAST ((class), G_TYPE_FLAGS, GFlagsClass))
/**
* G_IS_FLAGS_CLASS:
* @class: a #GFlagsClass
*
* Checks whether @class "is a" valid #GFlagsClass structure of type %G_TYPE_FLAGS
* or derived.
*/
#define G_IS_FLAGS_CLASS(class) (G_TYPE_CHECK_CLASS_TYPE ((class), G_TYPE_FLAGS))
/**
* G_FLAGS_CLASS_TYPE:
* @class: a #GFlagsClass
*
* Get the type identifier from a given #GFlagsClass structure.
*
* Returns: the #GType
*/
#define G_FLAGS_CLASS_TYPE(class) (G_TYPE_FROM_CLASS (class))
/**
* G_FLAGS_CLASS_TYPE_NAME:
* @class: a #GFlagsClass
*
* Get the static type name from a given #GFlagsClass structure.
*
* Returns: the type name.
*/
#define G_FLAGS_CLASS_TYPE_NAME(class) (g_type_name (G_FLAGS_CLASS_TYPE (class)))
/**
* G_VALUE_HOLDS_ENUM:
* @value: a valid #GValue structure
*
* Checks whether the given #GValue can hold values derived from type %G_TYPE_ENUM.
*
* Returns: %TRUE on success.
*/
#define G_VALUE_HOLDS_ENUM(value) (G_TYPE_CHECK_VALUE_TYPE ((value), G_TYPE_ENUM))
/**
* G_VALUE_HOLDS_FLAGS:
* @value: a valid #GValue structure
*
* Checks whether the given #GValue can hold values derived from type %G_TYPE_FLAGS.
*
* Returns: %TRUE on success.
*/
#define G_VALUE_HOLDS_FLAGS(value) (G_TYPE_CHECK_VALUE_TYPE ((value), G_TYPE_FLAGS))
/* --- enum/flag values & classes --- */
typedef struct _GEnumClass GEnumClass;
typedef struct _GFlagsClass GFlagsClass;
typedef struct _GEnumValue GEnumValue;
typedef struct _GFlagsValue GFlagsValue;
/**
* GEnumClass:
* @g_type_class: the parent class
* @minimum: the smallest possible value.
* @maximum: the largest possible value.
* @n_values: the number of possible values.
* @values: an array of #GEnumValue structs describing the
* individual values.
*
* The class of an enumeration type holds information about its
* possible values.
*/
struct _GEnumClass
{
GTypeClass g_type_class;
/*< public >*/
gint minimum;
gint maximum;
guint n_values;
GEnumValue *values;
};
/**
* GFlagsClass:
* @g_type_class: the parent class
* @mask: a mask covering all possible values.
* @n_values: the number of possible values.
* @values: an array of #GFlagsValue structs describing the
* individual values.
*
* The class of a flags type holds information about its
* possible values.
*/
struct _GFlagsClass
{
GTypeClass g_type_class;
/*< public >*/
guint mask;
guint n_values;
GFlagsValue *values;
};
/**
* GEnumValue:
* @value: the enum value
* @value_name: the name of the value
* @value_nick: the nickname of the value
*
* A structure which contains a single enum value, its name, and its
* nickname.
*/
struct _GEnumValue
{
gint value;
const gchar *value_name;
const gchar *value_nick;
};
/**
* GFlagsValue:
* @value: the flags value
* @value_name: the name of the value
* @value_nick: the nickname of the value
*
* A structure which contains a single flags value, its name, and its
* nickname.
*/
struct _GFlagsValue
{
guint value;
const gchar *value_name;
const gchar *value_nick;
};
/* --- prototypes --- */
GLIB_AVAILABLE_IN_ALL
GEnumValue* g_enum_get_value (GEnumClass *enum_class,
gint value);
GLIB_AVAILABLE_IN_ALL
GEnumValue* g_enum_get_value_by_name (GEnumClass *enum_class,
const gchar *name);
GLIB_AVAILABLE_IN_ALL
GEnumValue* g_enum_get_value_by_nick (GEnumClass *enum_class,
const gchar *nick);
GLIB_AVAILABLE_IN_ALL
GFlagsValue* g_flags_get_first_value (GFlagsClass *flags_class,
guint value);
GLIB_AVAILABLE_IN_ALL
GFlagsValue* g_flags_get_value_by_name (GFlagsClass *flags_class,
const gchar *name);
GLIB_AVAILABLE_IN_ALL
GFlagsValue* g_flags_get_value_by_nick (GFlagsClass *flags_class,
const gchar *nick);
GLIB_AVAILABLE_IN_2_54
gchar *g_enum_to_string (GType g_enum_type,
gint value);
GLIB_AVAILABLE_IN_2_54
gchar *g_flags_to_string (GType flags_type,
guint value);
GLIB_AVAILABLE_IN_ALL
void g_value_set_enum (GValue *value,
gint v_enum);
GLIB_AVAILABLE_IN_ALL
gint g_value_get_enum (const GValue *value);
GLIB_AVAILABLE_IN_ALL
void g_value_set_flags (GValue *value,
guint v_flags);
GLIB_AVAILABLE_IN_ALL
guint g_value_get_flags (const GValue *value);
/* --- registration functions --- */
/* const_static_values is a NULL terminated array of enum/flags
* values that is taken over!
*/
GLIB_AVAILABLE_IN_ALL
GType g_enum_register_static (const gchar *name,
const GEnumValue *const_static_values);
GLIB_AVAILABLE_IN_ALL
GType g_flags_register_static (const gchar *name,
const GFlagsValue *const_static_values);
/* functions to complete the type information
* for enums/flags implemented by plugins
*/
GLIB_AVAILABLE_IN_ALL
void g_enum_complete_type_info (GType g_enum_type,
GTypeInfo *info,
const GEnumValue *const_values);
GLIB_AVAILABLE_IN_ALL
void g_flags_complete_type_info (GType g_flags_type,
GTypeInfo *info,
const GFlagsValue *const_values);
/* {{{ Macros */
/**
* G_DEFINE_ENUM_VALUE:
* @EnumValue: an enumeration value
* @EnumNick: a short string representing the enumeration value
*
* Defines an enumeration value, and maps it to a "nickname".
*
* This macro can only be used with G_DEFINE_ENUM_TYPE() and
* G_DEFINE_FLAGS_TYPE().
*
* Since: 2.74
*/
#define G_DEFINE_ENUM_VALUE(EnumValue, EnumNick) \
{ EnumValue, #EnumValue, EnumNick } \
GLIB_AVAILABLE_MACRO_IN_2_74
/**
* G_DEFINE_ENUM_TYPE:
* @TypeName: the enumeration type, in `CamelCase`
* @type_name: the enumeration type prefixed, in `snake_case`
* @...: a list of enumeration values, defined using G_DEFINE_ENUM_VALUE()
*
* A convenience macro for defining enumeration types.
*
* This macro will generate a `*_get_type()` function for the
* given @TypeName, using @type_name as the function prefix.
*
* |[<!-- language="C" -->
* G_DEFINE_ENUM_TYPE (GtkOrientation, gtk_orientation,
* G_DEFINE_ENUM_VALUE (GTK_ORIENTATION_HORIZONTAL, "horizontal"),
* G_DEFINE_ENUM_VALUE (GTK_ORIENTATION_VERTICAL, "vertical"))
* ]|
*
* For projects that have multiple enumeration types, or enumeration
* types with many values, you should consider using glib-mkenums to
* generate the type function.
*
* Since: 2.74
*/
#define G_DEFINE_ENUM_TYPE(TypeName, type_name, ...) \
GType \
type_name ## _get_type (void) { \
static gsize g_define_type__static = 0; \
if (g_once_init_enter (&g_define_type__static)) { \
static const GEnumValue enum_values[] = { \
__VA_ARGS__ , \
{ 0, NULL, NULL }, \
}; \
GType g_define_type = g_enum_register_static (g_intern_static_string (#TypeName), enum_values); \
g_once_init_leave (&g_define_type__static, g_define_type); \
} \
return g_define_type__static; \
} \
GLIB_AVAILABLE_MACRO_IN_2_74
/**
* G_DEFINE_FLAGS_TYPE:
* @TypeName: the enumeration type, in `CamelCase`
* @type_name: the enumeration type prefixed, in `snake_case`
* @...: a list of enumeration values, defined using G_DEFINE_ENUM_VALUE()
*
* A convenience macro for defining flag types.
*
* This macro will generate a `*_get_type()` function for the
* given @TypeName, using @type_name as the function prefix.
*
* |[<!-- language="C" -->
* G_DEFINE_FLAGS_TYPE (GSettingsBindFlags, g_settings_bind_flags,
* G_DEFINE_ENUM_VALUE (G_SETTINGS_BIND_DEFAULT, "default"),
* G_DEFINE_ENUM_VALUE (G_SETTINGS_BIND_GET, "get"),
* G_DEFINE_ENUM_VALUE (G_SETTINGS_BIND_SET, "set"),
* G_DEFINE_ENUM_VALUE (G_SETTINGS_BIND_NO_SENSITIVITY, "no-sensitivity"),
* G_DEFINE_ENUM_VALUE (G_SETTINGS_BIND_GET_NO_CHANGES, "get-no-changes"),
* G_DEFINE_ENUM_VALUE (G_SETTINGS_BIND_INVERT_BOOLEAN, "invert-boolean"))
* ]|
*
* For projects that have multiple enumeration types, or enumeration
* types with many values, you should consider using glib-mkenums to
* generate the type function.
*
* Since: 2.74
*/
#define G_DEFINE_FLAGS_TYPE(TypeName, type_name, ...) \
GType \
type_name ## _get_type (void) { \
static gsize g_define_type__static = 0; \
if (g_once_init_enter (&g_define_type__static)) { \
static const GFlagsValue flags_values[] = { \
__VA_ARGS__ , \
{ 0, NULL, NULL }, \
}; \
GType g_define_type = g_flags_register_static (g_intern_static_string (#TypeName), flags_values); \
g_once_init_leave (&g_define_type__static, g_define_type); \
} \
return g_define_type__static; \
} \
GLIB_AVAILABLE_MACRO_IN_2_74
G_END_DECLS
#endif /* __G_ENUMS_H__ */