Calls the given function for each of the key/value pairs in qlist. The function is passed the key and value of each pair, and the given user_data parameter. qlist may not be modified while iterating over it.
the function to call for each key/value pair
Calls the given function for each of the key/value pairs in qlist. The function is passed the key and value of each pair, and the given user_data parameter. qlist may not be modified while iterating over it.