Specifies the type of a comparison function used to compare two
values. The function should return a negative integer if the first
value comes before the second, 0 if they are equal, or a positive
integer if the first value comes after the second.
aliasGCompareDataFunc = intfunction(void* a, void* b, void* userData)
Specifies the type of a comparison function used to compare two values. The function should return a negative integer if the first value comes before the second, 0 if they are equal, or a positive integer if the first value comes after the second.