protected static extern IntPtr g_hash_table_new( UnmanagedHashFunc hashFunc, UnmanagedEqualFunc keyEqualFunc);
protected static extern IntPtr g_hash_table_new_full( UnmanagedHashFunc hashFunc, UnmanagedEqualFunc keyEqualFunc, UnmanagedDestroyNotify keyDestroyFunc, UnmanagedDestroyNotify valueDestroyFunc);