Question

Currently I am working on a merge sort project in my class and am stuck on how to access and utilize the last parameter of this function header:

void Mergesort(ItemType* item, size_t nelem, int **(*fcmp) (const ItemType& e1, const ItemType& e2))**

Knowing that the result of the comparison will be -1, 0, or 1 but since the parameter itself doesn’t have a name, I don’t know how to explicitly call the pointer of the function.

Thanks in advance for any help.

Answer 1

It’s a pointer to a function, so you can call it like a regular function. For example:

fcmp(item[0], item[1]);