Function Pointers

Definition

A function pointer stores the address of a function with a compatible signature.

int add(int a, int b);
int (*ptr)(int,int) = &add;   // '&' optional; function name decays to pointer
int r = ptr(2,3);             // 5

Callbacks

void process(int* arr, int n, void (*op)(int)) {
  for (int i=0;i<n;++i) op(arr[i]);
}

Cautions

• Signature must match exactly.

• No state capture (unlike lambdas/functors).