Convenience method, which frees all the memory used by a #GQueue, and calls the specified destroy function on every element's data.
free_func should not modify the queue (eg, by removing the freed element from it).
the function to be called to free each element's data
Convenience method, which frees all the memory used by a #GQueue, and calls the specified destroy function on every element's data.
free_func should not modify the queue (eg, by removing the freed element from it).