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Functions
#define | G_ENUM_CLASS_TYPE() |
#define | G_ENUM_CLASS_TYPE_NAME() |
#define | G_TYPE_IS_ENUM() |
#define | G_ENUM_CLASS() |
#define | G_IS_ENUM_CLASS() |
#define | G_TYPE_IS_FLAGS() |
#define | G_FLAGS_CLASS() |
#define | G_IS_FLAGS_CLASS() |
#define | G_FLAGS_CLASS_TYPE() |
#define | G_FLAGS_CLASS_TYPE_NAME() |
GEnumValue * | g_enum_get_value () |
GEnumValue * | g_enum_get_value_by_name () |
GEnumValue * | g_enum_get_value_by_nick () |
gchar * | g_enum_to_string () |
GFlagsValue * | g_flags_get_first_value () |
GFlagsValue * | g_flags_get_value_by_name () |
GFlagsValue * | g_flags_get_value_by_nick () |
gchar * | g_flags_to_string () |
GType | g_enum_register_static () |
GType | g_flags_register_static () |
void | g_enum_complete_type_info () |
void | g_flags_complete_type_info () |
Description
The GLib type system provides fundamental types for enumeration and
flags types. (Flags types are like enumerations, but allow their
values to be combined by bitwise or). A registered enumeration or
flags type associates a name and a nickname with each allowed
value, and the methods g_enum_get_value_by_name()
,
g_enum_get_value_by_nick()
, g_flags_get_value_by_name()
and
g_flags_get_value_by_nick()
can look up values by their name or
nickname. When an enumeration or flags type is registered with the
GLib type system, it can be used as value type for object
properties, using g_param_spec_enum()
or g_param_spec_flags()
.
GObject ships with a utility called glib-mkenums, that can construct suitable type registration functions from C enumeration definitions.
Example of how to get a string representation of an enum value:
1 2 3 4 5 6 7 8 9 |
GEnumClass *enum_class; GEnumValue *enum_value; enum_class = g_type_class_ref (MAMAN_TYPE_MY_ENUM); enum_value = g_enum_get_value (enum_class, MAMAN_MY_ENUM_FOO); g_print ("Name: %s\n", enum_value->value_name); g_type_class_unref (enum_class); |
Functions
G_ENUM_CLASS_TYPE()
#define G_ENUM_CLASS_TYPE(class) (G_TYPE_FROM_CLASS (class))
Get the type identifier from a given GEnumClass structure.
G_ENUM_CLASS_TYPE_NAME()
#define G_ENUM_CLASS_TYPE_NAME(class) (g_type_name (G_ENUM_CLASS_TYPE (class)))
Get the static type name from a given GEnumClass structure.
G_TYPE_IS_ENUM()
#define G_TYPE_IS_ENUM(type) (G_TYPE_FUNDAMENTAL (type) == G_TYPE_ENUM)
Checks whether type
"is a" G_TYPE_ENUM
.
G_ENUM_CLASS()
#define G_ENUM_CLASS(class) (G_TYPE_CHECK_CLASS_CAST ((class), G_TYPE_ENUM, GEnumClass))
Casts a derived GEnumClass structure into a GEnumClass structure.
G_IS_ENUM_CLASS()
#define G_IS_ENUM_CLASS(class) (G_TYPE_CHECK_CLASS_TYPE ((class), G_TYPE_ENUM))
Checks whether class
"is a" valid GEnumClass structure of type G_TYPE_ENUM
or derived.
G_TYPE_IS_FLAGS()
#define G_TYPE_IS_FLAGS(type) (G_TYPE_FUNDAMENTAL (type) == G_TYPE_FLAGS)
Checks whether type
"is a" G_TYPE_FLAGS
.
G_FLAGS_CLASS()
#define G_FLAGS_CLASS(class) (G_TYPE_CHECK_CLASS_CAST ((class), G_TYPE_FLAGS, GFlagsClass))
Casts a derived GFlagsClass structure into a GFlagsClass structure.
G_IS_FLAGS_CLASS()
#define G_IS_FLAGS_CLASS(class) (G_TYPE_CHECK_CLASS_TYPE ((class), G_TYPE_FLAGS))
Checks whether class
"is a" valid GFlagsClass structure of type G_TYPE_FLAGS
or derived.
G_FLAGS_CLASS_TYPE()
#define G_FLAGS_CLASS_TYPE(class) (G_TYPE_FROM_CLASS (class))
Get the type identifier from a given GFlagsClass structure.
G_FLAGS_CLASS_TYPE_NAME()
#define G_FLAGS_CLASS_TYPE_NAME(class) (g_type_name (G_FLAGS_CLASS_TYPE (class)))
Get the static type name from a given GFlagsClass structure.
g_enum_get_value ()
GEnumValue * g_enum_get_value (GEnumClass *enum_class
,gint value
);
Returns the GEnumValue for a value.
Returns
the GEnumValue for value
, or NULL
if value
is not a member of the enumeration.
[transfer none]
g_enum_get_value_by_name ()
GEnumValue * g_enum_get_value_by_name (GEnumClass *enum_class
,const gchar *name
);
Looks up a GEnumValue by name.
Returns
the GEnumValue with name name
,
or NULL
if the enumeration doesn't have a member
with that name.
[transfer none]
g_enum_get_value_by_nick ()
GEnumValue * g_enum_get_value_by_nick (GEnumClass *enum_class
,const gchar *nick
);
Looks up a GEnumValue by nickname.
Returns
the GEnumValue with nickname nick
,
or NULL
if the enumeration doesn't have a member
with that nickname.
[transfer none]
g_enum_to_string ()
gchar * g_enum_to_string (GType g_enum_type
,gint value
);
Pretty-prints value
in the form of the enum’s name.
This is intended to be used for debugging purposes. The format of the output may change in the future.
Since: 2.54
g_flags_get_first_value ()
GFlagsValue * g_flags_get_first_value (GFlagsClass *flags_class
,guint value
);
Returns the first GFlagsValue which is set in value
.
g_flags_get_value_by_name ()
GFlagsValue * g_flags_get_value_by_name (GFlagsClass *flags_class
,const gchar *name
);
Looks up a GFlagsValue by name.
Returns
the GFlagsValue with name name
,
or NULL
if there is no flag with that name.
[transfer none]
g_flags_get_value_by_nick ()
GFlagsValue * g_flags_get_value_by_nick (GFlagsClass *flags_class
,const gchar *nick
);
Looks up a GFlagsValue by nickname.
Returns
the GFlagsValue with nickname nick
,
or NULL
if there is no flag with that nickname.
[transfer none]
g_flags_to_string ()
gchar * g_flags_to_string (GType flags_type
,guint value
);
Pretty-prints value
in the form of the flag names separated by |
and
sorted. Any extra bits will be shown at the end as a hexadecimal number.
This is intended to be used for debugging purposes. The format of the output may change in the future.
Since: 2.54
g_enum_register_static ()
GType g_enum_register_static (const gchar *name
,const GEnumValue *const_static_values
);
Registers a new static enumeration type with the name name
.
It is normally more convenient to let glib-mkenums,
generate a my_enum_get_type()
function from a usual C enumeration
definition than to write one yourself using g_enum_register_static()
.
Parameters
name |
A nul-terminated string used as the name of the new type. |
|
const_static_values |
An array of GEnumValue structs for the possible enumeration values. The array is terminated by a struct with all members being 0. GObject keeps a reference to the data, so it cannot be stack-allocated. |
g_flags_register_static ()
GType g_flags_register_static (const gchar *name
,const GFlagsValue *const_static_values
);
Registers a new static flags type with the name name
.
It is normally more convenient to let glib-mkenums
generate a my_flags_get_type()
function from a usual C enumeration
definition than to write one yourself using g_flags_register_static()
.
Parameters
name |
A nul-terminated string used as the name of the new type. |
|
const_static_values |
An array of GFlagsValue structs for the possible flags values. The array is terminated by a struct with all members being 0. GObject keeps a reference to the data, so it cannot be stack-allocated. |
g_enum_complete_type_info ()
void g_enum_complete_type_info (GType g_enum_type
,GTypeInfo *info
,const GEnumValue *const_values
);
This function is meant to be called from the complete_type_info
function of a GTypePlugin implementation, as in the following
example:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 |
static void my_enum_complete_type_info (GTypePlugin *plugin, GType g_type, GTypeInfo *info, GTypeValueTable *value_table) { static const GEnumValue values[] = { { MY_ENUM_FOO, "MY_ENUM_FOO", "foo" }, { MY_ENUM_BAR, "MY_ENUM_BAR", "bar" }, { 0, NULL, NULL } }; g_enum_complete_type_info (type, info, values); } |
Parameters
g_enum_type |
the type identifier of the type being completed |
|
info |
the GTypeInfo struct to be filled in. |
[out callee-allocates] |
const_values |
An array of GEnumValue structs for the possible enumeration values. The array is terminated by a struct with all members being 0. |
g_flags_complete_type_info ()
void g_flags_complete_type_info (GType g_flags_type
,GTypeInfo *info
,const GFlagsValue *const_values
);
This function is meant to be called from the complete_type_info()
function of a GTypePlugin implementation, see the example for
g_enum_complete_type_info()
above.
Parameters
g_flags_type |
the type identifier of the type being completed |
|
info |
the GTypeInfo struct to be filled in. |
[out callee-allocates] |
const_values |
An array of GFlagsValue structs for the possible enumeration values. The array is terminated by a struct with all members being 0. |
Types and Values
struct GEnumClass
struct GEnumClass { GTypeClass g_type_class; gint minimum; gint maximum; guint n_values; GEnumValue *values; };
The class of an enumeration type holds information about its possible values.
Members
GTypeClass |
the parent class |
|
gint |
the smallest possible value. |
|
gint |
the largest possible value. |
|
guint |
the number of possible values. |
|
GEnumValue * |
an array of GEnumValue structs describing the individual values. |
struct GFlagsClass
struct GFlagsClass { GTypeClass g_type_class; guint mask; guint n_values; GFlagsValue *values; };
The class of a flags type holds information about its possible values.
Members
GTypeClass |
the parent class |
|
guint |
a mask covering all possible values. |
|
guint |
the number of possible values. |
|
GFlagsValue * |
an array of GFlagsValue structs describing the individual values. |
struct GEnumValue
struct GEnumValue { gint value; const gchar *value_name; const gchar *value_nick; };
A structure which contains a single enum value, its name, and its nickname.