Function Pointer

In my Apple interview, I was shown this syntax in C++ and was a little rusty with that.

https://stackoverflow.com/questions/2298242/callback-functions-in-c

// Define callback signature.
typedef void (*DoneCallback) (int reason, char *explanation);
 
// A method that takes a callback as argument.
void doSomeWorkWithCallback(DoneCallback done)
{
    ...
    if (done) {
       done(1, "Finished");
    }   
}
 
//////
 
// A callback
void myCallback(int reason, char *explanation)
{
    printf("Callback called with reason %d: %s", reason, explanation);
}
 
/////
 
// Put them together
doSomeWortkWithCallback(myCallback);

• https://stackoverflow.com/questions/5645375/how-do-i-make-a-function-asynchronous-in-c