g_datalist_init ()

void
g_datalist_init (GData **datalist);

Resets the datalist to NULL. It does not free any memory or call any destroy functions.

g_datalist_id_set_data()

#define             g_datalist_id_set_data(dl, q, d)

Sets the data corresponding to the given GQuark id. Any previous data with the same key is removed, and its destroy function is called.

g_datalist_id_set_data_full ()

void
g_datalist_id_set_data_full (GData **datalist,
                             GQuark key_id,
                             gpointer data,
                             GDestroyNotify destroy_func);

Sets the data corresponding to the given GQuark id, and the function to be called when the element is removed from the datalist. Any previous data with the same key is removed, and its destroy function is called.

g_datalist_id_get_data ()

gpointer
g_datalist_id_get_data (GData **datalist,
                        GQuark key_id);

Retrieves the data element corresponding to key_id .

g_datalist_id_remove_data()

#define             g_datalist_id_remove_data(dl, q)

Removes an element, using its GQuark identifier.

g_datalist_id_remove_no_notify ()

gpointer
g_datalist_id_remove_no_notify (GData **datalist,
                                GQuark key_id);

Removes an element, without calling its destroy notification function.

GDuplicateFunc ()

gpointer
(*GDuplicateFunc) (gpointer data,
                   gpointer user_data);

The type of functions that are used to 'duplicate' an object. What this means depends on the context, it could just be incrementing the reference count, if data is a ref-counted object.

g_datalist_id_dup_data ()

gpointer
g_datalist_id_dup_data (GData **datalist,
                        GQuark key_id,
                        GDuplicateFunc dup_func,
                        gpointer user_data);

This is a variant of g_datalist_id_get_data() which returns a 'duplicate' of the value. dup_func defines the meaning of 'duplicate' in this context, it could e.g. take a reference on a ref-counted object.

If the key_id is not set in the datalist then dup_func will be called with a NULL argument.

Note that dup_func is called while the datalist is locked, so it is not allowed to read or modify the datalist.

This function can be useful to avoid races when multiple threads are using the same datalist and the same key.

Since 2.34

g_datalist_id_replace_data ()

gboolean
g_datalist_id_replace_data (GData **datalist,
                            GQuark key_id,
                            gpointer oldval,
                            gpointer newval,
                            GDestroyNotify destroy,
                            GDestroyNotify *old_destroy);

Compares the member that is associated with key_id in datalist to oldval , and if they are the same, replace oldval with newval .

This is like a typical atomic compare-and-exchange operation, for a member of datalist .

If the previous value was replaced then ownership of the old value (oldval ) is passed to the caller, including the registred destroy notify for it (passed out in old_destroy ). Its up to the caller to free this as he wishes, which may or may not include using old_destroy as sometimes replacement should not destroy the object in the normal way.

Since 2.34

g_datalist_set_data()

#define             g_datalist_set_data(dl, k, d)

Sets the data element corresponding to the given string identifier.

g_datalist_set_data_full()

#define             g_datalist_set_data_full(dl, k, d, f)

Sets the data element corresponding to the given string identifier, and the function to be called when the data element is removed.

g_datalist_get_data ()

gpointer
g_datalist_get_data (GData **datalist,
                     const gchar *key);

Gets a data element, using its string identifier. This is slower than g_datalist_id_get_data() because it compares strings.

g_datalist_remove_data()

#define             g_datalist_remove_data(dl, k)

Removes an element using its string identifier. The data element's destroy function is called if it has been set.

g_datalist_remove_no_notify()

#define             g_datalist_remove_no_notify(dl, k)

Removes an element, without calling its destroy notifier.

g_datalist_foreach ()

void
g_datalist_foreach (GData **datalist,
                    GDataForeachFunc func,
                    gpointer user_data);

Calls the given function for each data element of the datalist. The function is called with each data element's GQuark id and data, together with the given user_data parameter. Note that this function is NOT thread-safe. So unless datalist can be protected from any modifications during invocation of this function, it should not be called.

g_datalist_clear ()

void
g_datalist_clear (GData **datalist);

Frees all the data elements of the datalist. The data elements' destroy functions are called if they have been set.

g_datalist_set_flags ()

void
g_datalist_set_flags (GData **datalist,
                      guint flags);

Turns on flag values for a data list. This function is used to keep a small number of boolean flags in an object with a data list without using any additional space. It is not generally useful except in circumstances where space is very tight. (It is used in the base GObject type, for example.)

Since 2.8

g_datalist_unset_flags ()

void
g_datalist_unset_flags (GData **datalist,
                        guint flags);

Turns off flag values for a data list. See g_datalist_unset_flags()

Since 2.8

g_datalist_get_flags ()

guint
g_datalist_get_flags (GData **datalist);

Gets flags values packed in together with the datalist. See g_datalist_set_flags().

Since 2.8

GData

typedef struct _GData GData;

The GData struct is an opaque data structure to represent a Keyed Data List. It should only be accessed via the following functions.

G_DATALIST_FLAGS_MASK

#define G_DATALIST_FLAGS_MASK 0x3

A bitmask that restricts the possible flags passed to g_datalist_set_flags(). Passing a flags value where flags & ~G_DATALIST_FLAGS_MASK != 0 is an error.