Description

Datasets associate groups of data elements with particular memory locations. These are useful if you need to associate data with a structure returned from an external library. Since you cannot modify the structure, you use its location in memory as the key into a dataset, where you can associate any number of data elements with it.

There are two forms of most of the dataset functions. The first form uses strings to identify the data elements associated with a location. The second form uses GQuark identifiers, which are created with a call to g_quark_from_string() or g_quark_from_static_string(). The second form is quicker, since it does not require looking up the string in the hash table of GQuark identifiers.

There is no function to create a dataset. It is automatically created as soon as you add elements to it.

To add data elements to a dataset use g_dataset_id_set_data(), g_dataset_id_set_data_full(), g_dataset_set_data() and g_dataset_set_data_full().

To get data elements from a dataset use g_dataset_id_get_data() and g_dataset_get_data().

To iterate over all data elements in a dataset use g_dataset_foreach().

To remove data elements from a dataset use g_dataset_id_remove_data() and g_dataset_remove_data().

To destroy a dataset, use g_dataset_destroy().

Details

#define     g_dataset_id_set_data(l, k, d)

void        g_dataset_id_set_data_full      (gconstpointer dataset_location,
                                             GQuark key_id,
                                             gpointer data,
                                             GDestroyNotify destroy_func);

void        (*GDestroyNotify)               (gpointer data);

gpointer    g_dataset_id_get_data           (gconstpointer dataset_location,
                                             GQuark key_id);

#define     g_dataset_id_remove_data(l, k)

gpointer    g_dataset_id_remove_no_notify   (gconstpointer dataset_location,
                                             GQuark key_id);

#define     g_dataset_set_data(l, k, d)

#define     g_dataset_set_data_full(l, k, d, f)

#define     g_dataset_get_data(l, k)

#define     g_dataset_remove_data(l, k)

#define     g_dataset_remove_no_notify(l, k)

void        g_dataset_foreach               (gconstpointer dataset_location,
                                             GDataForeachFunc func,
                                             gpointer user_data);

void        (*GDataForeachFunc)             (GQuark key_id,
                                             gpointer data,
                                             gpointer user_data);

void        g_dataset_destroy               (gconstpointer dataset_location);