Pointers to Functions
There are cases where there is a function call in a command but there is no prior knowledge which function is to be called
Example: void *v1, *v2; if (compare(v1,v2) == 0) { … v1, v2 may point to integers or strings or other types. An appropriate compare function should be called, according to the type of the objects pointed to by v1, v2.
Solution: enum {INT, STR} int (*compare)(void*, void*); /*pointer to function*/ ... switch(type){ case INT: compare = &num_compare; break; case STR: compare = &strcmp; break; } if ((*compare)(v1,v2) == 0) { /*or “compare(v1,v2)” */