Calls the given function for each data element which is associated
with the given location. Note that this function is NOT thread-safe.
So unless @datalist can be protected from any modifications during
invocation of this function, it should not be called.
Calls the given function for each data element which is associated with the given location. Note that this function is NOT thread-safe. So unless @datalist can be protected from any modifications during invocation of this function, it should not be called.