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CHAPTER 6 USING GLIB
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The key comparison function is defined by the following GEqualFunc prototype. These functions should return TRUE if a and b are equal and FALSE if they are not. GLib already provides three functions: g_direct_equal(), g_int_equal(), and g_str_equal(), which act as comparison functions for gpointer, gint, and string type keys. gboolean (*GEqualFunc) (gconstpointer a, gconstpointer b); In addition to g_hash_table_new(), GLib provides g_hash_table_new_full(), which allows you to supply destroy callback functions for keys and values when they are removed from the hash table. There are two ways to insert a new key-value pair into a hash table. The first is by calling g_hash_table_insert(). If the key already exists within the table, value will replace its current value. You can also call g_hash_table_replace(), which provides the same functionality. However, if the key already exists within the table, both the key and value objects will be replaced. void g_hash_table_insert (GHashTable *hash_table, gpointer key, gpointer value); Removing a key-value pair from a hash table is done with g_hash_table_remove(). If you supplied destroy functions for the key and value, they will be called at this time. Otherwise, you will have to make sure to destroy any dynamically allocated data yourself. This function will return TRUE if the key was successfully removed. You can also remove every key-value pair from a hash table with g_hash_table_remove_all(). gboolean g_hash_table_remove (GHashTable *hash_table, gconstpointer key); As previously stated, one advantage of hash tables is that looking up a value occurs in constant time, regardless of the number of elements in the hash table. You can search for a value corresponding to the key given to g_hash_table_lookup(). The associated value will be returned, or NULL will be returned if the key could not be found. gpointer g_hash_table_lookup (GHashTable *hash_table, gconstpointer key); Additionally, you can call g_hash_table_lookup_extended(). This function returns TRUE if the key was found within the GHashTable. It will then set the original key and the value, which are two additional parameters sent to the function. When you are finished with the hash table, it should be freed with g_hash_table_destroy(). If you supplied destroy functions for the keys and values, they will be called on every object at this time. void g_hash_table_destroy (GHashTable *hash_table);
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CHAPTER 6 USING GLIB
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One thing that makes this function unique is that, in addition to destroying all keys and values, it decrements its reference count by one. It is possible to increase and decrease the reference count of a hash table with g_hash_table_ref() and g_hash_table_unref() respectively. So, the hash table may still exist as an object if the reference count did not reach zero.
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A quark is a two-way association between a 32-bit integer and a string. This means that you can access the string by using the integer and vice versa. Quarks are calculated at runtime and are available globally throughout the application. You can set a new quark at any point in your program, and it will be available in any other aspect of the application. Internally, quarks are implemented as a hash table and an array of strings. The quark itself is a 32-bit integer that is used as the index of the array, which is used to look up the associated string. The string is used to find the quark in the hash table. This means that all strings and integers must be unique. typedef guint32 GQuark; To get the GQuark of the given string, use g_quark_from_string(). If the string is not already associated with a GQuark, using a copy of the string will create one. If you are sure that the string will always exist, you can use g_quark_from_string_static(), which will use the string itself instead of a copy. GQuark g_quark_from_string (const gchar *string); To test whether a string already has an associated quark, you can use g_quark_try_string(). This function accepts a string and returns the associated GQuark. If the string has not been added, it will return 0. If a string already exists within the global table, you can retrieve it from the quark with g_quark_to_string(). If the quark does not already exist, then this function will return NULL. const gchar* g_quark_to_string (GQuark quark);
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