C++, create a pthread for a function with a return type?

Question

Say I have the following function:

bool foo (int a); // This method declaration can not be changed.

How do I create a pthread for this? And how

Answer 1

A bool is functionally equivalent to an int. false is (usually) 0, and true is anything else. Thus

void *foo(void *a){
  int *a_int = (int *)a;
  //do things
  bool *x = new bool;
  *x = answer; 
  pthread_exit(x);
}

Then in your main you would get the returned result by casting it back to a bool.

bool *x; 
pthread_join(thread,(void *)x);
//Answer is *x