diff options
Diffstat (limited to 'gir/gobject-2.0.c')
| -rw-r--r-- | gir/gobject-2.0.c | 484 |
1 files changed, 193 insertions, 291 deletions
diff --git a/gir/gobject-2.0.c b/gir/gobject-2.0.c index b78b988c..f9ab6755 100644 --- a/gir/gobject-2.0.c +++ b/gir/gobject-2.0.c @@ -901,22 +901,17 @@ /** * g_cclosure_marshal_BOOLEAN__FLAGS: - * @closure: A #GClosure. - * @return_value: A #GValue to store the return value. May be %NULL - * if the callback of closure doesn't return a value. - * @n_param_values: The length of the @param_values array. - * @param_values: An array of #GValues holding the arguments - * on which to invoke the callback of closure. - * @invocation_hint: The invocation hint given as the last argument to - * g_closure_invoke(). - * @marshal_data: Additional data specified when registering the - * marshaller, see g_closure_set_marshal() and - * g_closure_set_meta_marshal() + * @closure: the #GClosure to which the marshaller belongs + * @return_value: a #GValue which can store the returned #gboolean + * @n_param_values: 2 + * @param_values: a #GValue array holding instance and arg1 + * @invocation_hint: the invocation hint given as the last argument + * to g_closure_invoke() + * @marshal_data: additional data specified when registering the marshaller * - * A #GClosureMarshal function for use with signals with handlers that - * take a flags type as an argument and return a boolean. If you have - * such a signal, you will probably also need to use an accumulator, - * such as g_signal_accumulator_true_handled(). + * A marshaller for a #GCClosure with a callback of type + * `gboolean (*callback) (gpointer instance, gint arg1, gpointer user_data)` where the #gint parameter + * denotes a flags type. */ @@ -976,39 +971,23 @@ /** * g_cclosure_marshal_BOOL__FLAGS: - * @closure: A #GClosure. - * @return_value: A #GValue to store the return value. May be %NULL - * if the callback of closure doesn't return a value. - * @n_param_values: The length of the @param_values array. - * @param_values: An array of #GValues holding the arguments - * on which to invoke the callback of closure. - * @invocation_hint: The invocation hint given as the last argument to - * g_closure_invoke(). - * @marshal_data: Additional data specified when registering the - * marshaller, see g_closure_set_marshal() and - * g_closure_set_meta_marshal() * - * An old alias for g_cclosure_marshal_BOOLEAN__FLAGS(). + * Another name for g_cclosure_marshal_BOOLEAN__FLAGS(). */ /** * g_cclosure_marshal_STRING__OBJECT_POINTER: - * @closure: A #GClosure. - * @return_value: A #GValue to store the return value. May be %NULL - * if the callback of closure doesn't return a value. - * @n_param_values: The length of the @param_values array. - * @param_values: An array of #GValues holding the arguments - * on which to invoke the callback of closure. - * @invocation_hint: The invocation hint given as the last argument to - * g_closure_invoke(). - * @marshal_data: Additional data specified when registering the - * marshaller, see g_closure_set_marshal() and - * g_closure_set_meta_marshal() + * @closure: the #GClosure to which the marshaller belongs + * @return_value: a #GValue, which can store the returned string + * @n_param_values: 3 + * @param_values: a #GValue array holding instance, arg1 and arg2 + * @invocation_hint: the invocation hint given as the last argument + * to g_closure_invoke() + * @marshal_data: additional data specified when registering the marshaller * - * A #GClosureMarshal function for use with signals with handlers that - * take a #GObject and a pointer and produce a string. It is highly - * unlikely that your signal handler fits this description. + * A marshaller for a #GCClosure with a callback of type + * `gchar* (*callback) (gpointer instance, GObject *arg1, gpointer arg2, gpointer user_data)`. */ @@ -1033,20 +1012,16 @@ /** * g_cclosure_marshal_VOID__BOOLEAN: - * @closure: A #GClosure. - * @return_value: A #GValue to store the return value. May be %NULL - * if the callback of closure doesn't return a value. - * @n_param_values: The length of the @param_values array. - * @param_values: An array of #GValues holding the arguments - * on which to invoke the callback of closure. - * @invocation_hint: The invocation hint given as the last argument to - * g_closure_invoke(). - * @marshal_data: Additional data specified when registering the - * marshaller, see g_closure_set_marshal() and - * g_closure_set_meta_marshal() + * @closure: the #GClosure to which the marshaller belongs + * @return_value: ignored + * @n_param_values: 2 + * @param_values: a #GValue array holding the instance and the #gboolean parameter + * @invocation_hint: the invocation hint given as the last argument + * to g_closure_invoke() + * @marshal_data: additional data specified when registering the marshaller * - * A #GClosureMarshal function for use with signals with a single - * boolean argument. + * A marshaller for a #GCClosure with a callback of type + * `void (*callback) (gpointer instance, gboolean arg1, gpointer user_data)`. */ @@ -1071,20 +1046,16 @@ /** * g_cclosure_marshal_VOID__BOXED: - * @closure: A #GClosure. - * @return_value: A #GValue to store the return value. May be %NULL - * if the callback of closure doesn't return a value. - * @n_param_values: The length of the @param_values array. - * @param_values: An array of #GValues holding the arguments - * on which to invoke the callback of closure. - * @invocation_hint: The invocation hint given as the last argument to - * g_closure_invoke(). - * @marshal_data: Additional data specified when registering the - * marshaller, see g_closure_set_marshal() and - * g_closure_set_meta_marshal() + * @closure: the #GClosure to which the marshaller belongs + * @return_value: ignored + * @n_param_values: 2 + * @param_values: a #GValue array holding the instance and the #GBoxed* parameter + * @invocation_hint: the invocation hint given as the last argument + * to g_closure_invoke() + * @marshal_data: additional data specified when registering the marshaller * - * A #GClosureMarshal function for use with signals with a single - * argument which is any boxed pointer type. + * A marshaller for a #GCClosure with a callback of type + * `void (*callback) (gpointer instance, GBoxed *arg1, gpointer user_data)`. */ @@ -1109,20 +1080,16 @@ /** * g_cclosure_marshal_VOID__CHAR: - * @closure: A #GClosure. - * @return_value: A #GValue to store the return value. May be %NULL - * if the callback of closure doesn't return a value. - * @n_param_values: The length of the @param_values array. - * @param_values: An array of #GValues holding the arguments - * on which to invoke the callback of closure. - * @invocation_hint: The invocation hint given as the last argument to - * g_closure_invoke(). - * @marshal_data: Additional data specified when registering the - * marshaller, see g_closure_set_marshal() and - * g_closure_set_meta_marshal() + * @closure: the #GClosure to which the marshaller belongs + * @return_value: ignored + * @n_param_values: 2 + * @param_values: a #GValue array holding the instance and the #gchar parameter + * @invocation_hint: the invocation hint given as the last argument + * to g_closure_invoke() + * @marshal_data: additional data specified when registering the marshaller * - * A #GClosureMarshal function for use with signals with a single - * character argument. + * A marshaller for a #GCClosure with a callback of type + * `void (*callback) (gpointer instance, gchar arg1, gpointer user_data)`. */ @@ -1147,20 +1114,16 @@ /** * g_cclosure_marshal_VOID__DOUBLE: - * @closure: A #GClosure. - * @return_value: A #GValue to store the return value. May be %NULL - * if the callback of closure doesn't return a value. - * @n_param_values: The length of the @param_values array. - * @param_values: An array of #GValues holding the arguments - * on which to invoke the callback of closure. - * @invocation_hint: The invocation hint given as the last argument to - * g_closure_invoke(). - * @marshal_data: Additional data specified when registering the - * marshaller, see g_closure_set_marshal() and - * g_closure_set_meta_marshal() + * @closure: the #GClosure to which the marshaller belongs + * @return_value: ignored + * @n_param_values: 2 + * @param_values: a #GValue array holding the instance and the #gdouble parameter + * @invocation_hint: the invocation hint given as the last argument + * to g_closure_invoke() + * @marshal_data: additional data specified when registering the marshaller * - * A #GClosureMarshal function for use with signals with one - * double-precision floating point argument. + * A marshaller for a #GCClosure with a callback of type + * `void (*callback) (gpointer instance, gdouble arg1, gpointer user_data)`. */ @@ -1185,20 +1148,16 @@ /** * g_cclosure_marshal_VOID__ENUM: - * @closure: A #GClosure. - * @return_value: A #GValue to store the return value. May be %NULL - * if the callback of closure doesn't return a value. - * @n_param_values: The length of the @param_values array. - * @param_values: An array of #GValues holding the arguments - * on which to invoke the callback of closure. - * @invocation_hint: The invocation hint given as the last argument to - * g_closure_invoke(). - * @marshal_data: Additional data specified when registering the - * marshaller, see g_closure_set_marshal() and - * g_closure_set_meta_marshal() + * @closure: the #GClosure to which the marshaller belongs + * @return_value: ignored + * @n_param_values: 2 + * @param_values: a #GValue array holding the instance and the enumeration parameter + * @invocation_hint: the invocation hint given as the last argument + * to g_closure_invoke() + * @marshal_data: additional data specified when registering the marshaller * - * A #GClosureMarshal function for use with signals with a single - * argument with an enumerated type. + * A marshaller for a #GCClosure with a callback of type + * `void (*callback) (gpointer instance, gint arg1, gpointer user_data)` where the #gint parameter denotes an enumeration type.. */ @@ -1223,20 +1182,16 @@ /** * g_cclosure_marshal_VOID__FLAGS: - * @closure: A #GClosure. - * @return_value: A #GValue to store the return value. May be %NULL - * if the callback of closure doesn't return a value. - * @n_param_values: The length of the @param_values array. - * @param_values: An array of #GValues holding the arguments - * on which to invoke the callback of closure. - * @invocation_hint: The invocation hint given as the last argument to - * g_closure_invoke(). - * @marshal_data: Additional data specified when registering the - * marshaller, see g_closure_set_marshal() and - * g_closure_set_meta_marshal() + * @closure: the #GClosure to which the marshaller belongs + * @return_value: ignored + * @n_param_values: 2 + * @param_values: a #GValue array holding the instance and the flags parameter + * @invocation_hint: the invocation hint given as the last argument + * to g_closure_invoke() + * @marshal_data: additional data specified when registering the marshaller * - * A #GClosureMarshal function for use with signals with a single - * argument with a flags types. + * A marshaller for a #GCClosure with a callback of type + * `void (*callback) (gpointer instance, gint arg1, gpointer user_data)` where the #gint parameter denotes a flags type. */ @@ -1261,20 +1216,16 @@ /** * g_cclosure_marshal_VOID__FLOAT: - * @closure: A #GClosure. - * @return_value: A #GValue to store the return value. May be %NULL - * if the callback of closure doesn't return a value. - * @n_param_values: The length of the @param_values array. - * @param_values: An array of #GValues holding the arguments - * on which to invoke the callback of closure. - * @invocation_hint: The invocation hint given as the last argument to - * g_closure_invoke(). - * @marshal_data: Additional data specified when registering the - * marshaller, see g_closure_set_marshal() and - * g_closure_set_meta_marshal() + * @closure: the #GClosure to which the marshaller belongs + * @return_value: ignored + * @n_param_values: 2 + * @param_values: a #GValue array holding the instance and the #gfloat parameter + * @invocation_hint: the invocation hint given as the last argument + * to g_closure_invoke() + * @marshal_data: additional data specified when registering the marshaller * - * A #GClosureMarshal function for use with signals with one - * single-precision floating point argument. + * A marshaller for a #GCClosure with a callback of type + * `void (*callback) (gpointer instance, gfloat arg1, gpointer user_data)`. */ @@ -1299,20 +1250,16 @@ /** * g_cclosure_marshal_VOID__INT: - * @closure: A #GClosure. - * @return_value: A #GValue to store the return value. May be %NULL - * if the callback of closure doesn't return a value. - * @n_param_values: The length of the @param_values array. - * @param_values: An array of #GValues holding the arguments - * on which to invoke the callback of closure. - * @invocation_hint: The invocation hint given as the last argument to - * g_closure_invoke(). - * @marshal_data: Additional data specified when registering the - * marshaller, see g_closure_set_marshal() and - * g_closure_set_meta_marshal() + * @closure: the #GClosure to which the marshaller belongs + * @return_value: ignored + * @n_param_values: 2 + * @param_values: a #GValue array holding the instance and the #gint parameter + * @invocation_hint: the invocation hint given as the last argument + * to g_closure_invoke() + * @marshal_data: additional data specified when registering the marshaller * - * A #GClosureMarshal function for use with signals with a single - * integer argument. + * A marshaller for a #GCClosure with a callback of type + * `void (*callback) (gpointer instance, gint arg1, gpointer user_data)`. */ @@ -1337,20 +1284,16 @@ /** * g_cclosure_marshal_VOID__LONG: - * @closure: A #GClosure. - * @return_value: A #GValue to store the return value. May be %NULL - * if the callback of closure doesn't return a value. - * @n_param_values: The length of the @param_values array. - * @param_values: An array of #GValues holding the arguments - * on which to invoke the callback of closure. - * @invocation_hint: The invocation hint given as the last argument to - * g_closure_invoke(). - * @marshal_data: Additional data specified when registering the - * marshaller, see g_closure_set_marshal() and - * g_closure_set_meta_marshal() + * @closure: the #GClosure to which the marshaller belongs + * @return_value: ignored + * @n_param_values: 2 + * @param_values: a #GValue array holding the instance and the #glong parameter + * @invocation_hint: the invocation hint given as the last argument + * to g_closure_invoke() + * @marshal_data: additional data specified when registering the marshaller * - * A #GClosureMarshal function for use with signals with with a single - * long integer argument. + * A marshaller for a #GCClosure with a callback of type + * `void (*callback) (gpointer instance, glong arg1, gpointer user_data)`. */ @@ -1375,20 +1318,16 @@ /** * g_cclosure_marshal_VOID__OBJECT: - * @closure: A #GClosure. - * @return_value: A #GValue to store the return value. May be %NULL - * if the callback of closure doesn't return a value. - * @n_param_values: The length of the @param_values array. - * @param_values: An array of #GValues holding the arguments - * on which to invoke the callback of closure. - * @invocation_hint: The invocation hint given as the last argument to - * g_closure_invoke(). - * @marshal_data: Additional data specified when registering the - * marshaller, see g_closure_set_marshal() and - * g_closure_set_meta_marshal() + * @closure: the #GClosure to which the marshaller belongs + * @return_value: ignored + * @n_param_values: 2 + * @param_values: a #GValue array holding the instance and the #GObject* parameter + * @invocation_hint: the invocation hint given as the last argument + * to g_closure_invoke() + * @marshal_data: additional data specified when registering the marshaller * - * A #GClosureMarshal function for use with signals with a single - * #GObject argument. + * A marshaller for a #GCClosure with a callback of type + * `void (*callback) (gpointer instance, GObject *arg1, gpointer user_data)`. */ @@ -1413,20 +1352,16 @@ /** * g_cclosure_marshal_VOID__PARAM: - * @closure: A #GClosure. - * @return_value: A #GValue to store the return value. May be %NULL - * if the callback of closure doesn't return a value. - * @n_param_values: The length of the @param_values array. - * @param_values: An array of #GValues holding the arguments - * on which to invoke the callback of closure. - * @invocation_hint: The invocation hint given as the last argument to - * g_closure_invoke(). - * @marshal_data: Additional data specified when registering the - * marshaller, see g_closure_set_marshal() and - * g_closure_set_meta_marshal() + * @closure: the #GClosure to which the marshaller belongs + * @return_value: ignored + * @n_param_values: 2 + * @param_values: a #GValue array holding the instance and the #GParamSpec* parameter + * @invocation_hint: the invocation hint given as the last argument + * to g_closure_invoke() + * @marshal_data: additional data specified when registering the marshaller * - * A #GClosureMarshal function for use with signals with a single - * argument of type #GParamSpec. + * A marshaller for a #GCClosure with a callback of type + * `void (*callback) (gpointer instance, GParamSpec *arg1, gpointer user_data)`. */ @@ -1451,24 +1386,16 @@ /** * g_cclosure_marshal_VOID__POINTER: - * @closure: A #GClosure. - * @return_value: A #GValue to store the return value. May be %NULL - * if the callback of closure doesn't return a value. - * @n_param_values: The length of the @param_values array. - * @param_values: An array of #GValues holding the arguments - * on which to invoke the callback of closure. - * @invocation_hint: The invocation hint given as the last argument to - * g_closure_invoke(). - * @marshal_data: Additional data specified when registering the - * marshaller, see g_closure_set_marshal() and - * g_closure_set_meta_marshal() - * - * A #GClosureMarshal function for use with signals with a single raw - * pointer argument type. + * @closure: the #GClosure to which the marshaller belongs + * @return_value: ignored + * @n_param_values: 2 + * @param_values: a #GValue array holding the instance and the #gpointer parameter + * @invocation_hint: the invocation hint given as the last argument + * to g_closure_invoke() + * @marshal_data: additional data specified when registering the marshaller * - * If it is possible, it is better to use one of the more specific - * functions such as g_cclosure_marshal_VOID__OBJECT() or - * g_cclosure_marshal_VOID__OBJECT(). + * A marshaller for a #GCClosure with a callback of type + * `void (*callback) (gpointer instance, gpointer arg1, gpointer user_data)`. */ @@ -1493,20 +1420,16 @@ /** * g_cclosure_marshal_VOID__STRING: - * @closure: A #GClosure. - * @return_value: A #GValue to store the return value. May be %NULL - * if the callback of closure doesn't return a value. - * @n_param_values: The length of the @param_values array. - * @param_values: An array of #GValues holding the arguments - * on which to invoke the callback of closure. - * @invocation_hint: The invocation hint given as the last argument to - * g_closure_invoke(). - * @marshal_data: Additional data specified when registering the - * marshaller, see g_closure_set_marshal() and - * g_closure_set_meta_marshal() + * @closure: the #GClosure to which the marshaller belongs + * @return_value: ignored + * @n_param_values: 2 + * @param_values: a #GValue array holding the instance and the #gchar* parameter + * @invocation_hint: the invocation hint given as the last argument + * to g_closure_invoke() + * @marshal_data: additional data specified when registering the marshaller * - * A #GClosureMarshal function for use with signals with a single string - * argument. + * A marshaller for a #GCClosure with a callback of type + * `void (*callback) (gpointer instance, const gchar *arg1, gpointer user_data)`. */ @@ -1531,20 +1454,16 @@ /** * g_cclosure_marshal_VOID__UCHAR: - * @closure: A #GClosure. - * @return_value: A #GValue to store the return value. May be %NULL - * if the callback of closure doesn't return a value. - * @n_param_values: The length of the @param_values array. - * @param_values: An array of #GValues holding the arguments - * on which to invoke the callback of closure. - * @invocation_hint: The invocation hint given as the last argument to - * g_closure_invoke(). - * @marshal_data: Additional data specified when registering the - * marshaller, see g_closure_set_marshal() and - * g_closure_set_meta_marshal() + * @closure: the #GClosure to which the marshaller belongs + * @return_value: ignored + * @n_param_values: 2 + * @param_values: a #GValue array holding the instance and the #guchar parameter + * @invocation_hint: the invocation hint given as the last argument + * to g_closure_invoke() + * @marshal_data: additional data specified when registering the marshaller * - * A #GClosureMarshal function for use with signals with a single - * unsigned character argument. + * A marshaller for a #GCClosure with a callback of type + * `void (*callback) (gpointer instance, guchar arg1, gpointer user_data)`. */ @@ -1569,39 +1488,31 @@ /** * g_cclosure_marshal_VOID__UINT: - * @closure: A #GClosure. - * @return_value: A #GValue to store the return value. May be %NULL - * if the callback of closure doesn't return a value. - * @n_param_values: The length of the @param_values array. - * @param_values: An array of #GValues holding the arguments - * on which to invoke the callback of closure. - * @invocation_hint: The invocation hint given as the last argument to - * g_closure_invoke(). - * @marshal_data: Additional data specified when registering the - * marshaller, see g_closure_set_marshal() and - * g_closure_set_meta_marshal() + * @closure: the #GClosure to which the marshaller belongs + * @return_value: ignored + * @n_param_values: 2 + * @param_values: a #GValue array holding the instance and the #guint parameter + * @invocation_hint: the invocation hint given as the last argument + * to g_closure_invoke() + * @marshal_data: additional data specified when registering the marshaller * - * A #GClosureMarshal function for use with signals with with a single - * unsigned integer argument. + * A marshaller for a #GCClosure with a callback of type + * `void (*callback) (gpointer instance, guint arg1, gpointer user_data)`. */ /** * g_cclosure_marshal_VOID__UINT_POINTER: - * @closure: A #GClosure. - * @return_value: A #GValue to store the return value. May be %NULL - * if the callback of closure doesn't return a value. - * @n_param_values: The length of the @param_values array. - * @param_values: An array of #GValues holding the arguments - * on which to invoke the callback of closure. - * @invocation_hint: The invocation hint given as the last argument to - * g_closure_invoke(). - * @marshal_data: Additional data specified when registering the - * marshaller, see g_closure_set_marshal() and - * g_closure_set_meta_marshal() + * @closure: the #GClosure to which the marshaller belongs + * @return_value: ignored + * @n_param_values: 3 + * @param_values: a #GValue array holding instance, arg1 and arg2 + * @invocation_hint: the invocation hint given as the last argument + * to g_closure_invoke() + * @marshal_data: additional data specified when registering the marshaller * - * A #GClosureMarshal function for use with signals with a unsigned int - * and a pointer as arguments. + * A marshaller for a #GCClosure with a callback of type + * `void (*callback) (gpointer instance, guint arg1, gpointer arg2, gpointer user_data)`. */ @@ -1645,20 +1556,16 @@ /** * g_cclosure_marshal_VOID__ULONG: - * @closure: A #GClosure. - * @return_value: A #GValue to store the return value. May be %NULL - * if the callback of closure doesn't return a value. - * @n_param_values: The length of the @param_values array. - * @param_values: An array of #GValues holding the arguments - * on which to invoke the callback of closure. - * @invocation_hint: The invocation hint given as the last argument to - * g_closure_invoke(). - * @marshal_data: Additional data specified when registering the - * marshaller, see g_closure_set_marshal() and - * g_closure_set_meta_marshal() + * @closure: the #GClosure to which the marshaller belongs + * @return_value: ignored + * @n_param_values: 2 + * @param_values: a #GValue array holding the instance and the #gulong parameter + * @invocation_hint: the invocation hint given as the last argument + * to g_closure_invoke() + * @marshal_data: additional data specified when registering the marshaller * - * A #GClosureMarshal function for use with signals with a single - * unsigned long integer argument. + * A marshaller for a #GCClosure with a callback of type + * `void (*callback) (gpointer instance, gulong arg1, gpointer user_data)`. */ @@ -1683,20 +1590,18 @@ /** * g_cclosure_marshal_VOID__VARIANT: - * @closure: A #GClosure. - * @return_value: A #GValue to store the return value. May be %NULL - * if the callback of closure doesn't return a value. - * @n_param_values: The length of the @param_values array. - * @param_values: An array of #GValues holding the arguments - * on which to invoke the callback of closure. - * @invocation_hint: The invocation hint given as the last argument to - * g_closure_invoke(). - * @marshal_data: Additional data specified when registering the - * marshaller, see g_closure_set_marshal() and - * g_closure_set_meta_marshal() + * @closure: the #GClosure to which the marshaller belongs + * @return_value: ignored + * @n_param_values: 2 + * @param_values: a #GValue array holding the instance and the #GVariant* parameter + * @invocation_hint: the invocation hint given as the last argument + * to g_closure_invoke() + * @marshal_data: additional data specified when registering the marshaller * - * A #GClosureMarshal function for use with signals with a single - * #GVariant argument. + * A marshaller for a #GCClosure with a callback of type + * `void (*callback) (gpointer instance, GVariant *arg1, gpointer user_data)`. + * + * Since: 2.26 */ @@ -1721,19 +1626,16 @@ /** * g_cclosure_marshal_VOID__VOID: - * @closure: A #GClosure. - * @return_value: A #GValue to store the return value. May be %NULL - * if the callback of closure doesn't return a value. - * @n_param_values: The length of the @param_values array. - * @param_values: An array of #GValues holding the arguments - * on which to invoke the callback of closure. - * @invocation_hint: The invocation hint given as the last argument to - * g_closure_invoke(). - * @marshal_data: Additional data specified when registering the - * marshaller, see g_closure_set_marshal() and - * g_closure_set_meta_marshal() + * @closure: the #GClosure to which the marshaller belongs + * @return_value: ignored + * @n_param_values: 1 + * @param_values: a #GValue array holding only the instance + * @invocation_hint: the invocation hint given as the last argument + * to g_closure_invoke() + * @marshal_data: additional data specified when registering the marshaller * - * A #GClosureMarshal function for use with signals with no arguments. + * A marshaller for a #GCClosure with a callback of type + * `void (*callback) (gpointer instance, gpointer user_data)`. */ |