5.10. inline Functions

To avoid the overhead associated with a function call (i.e., creation of a stack frame containing copies of arguments or addresses of reference parameters and the return address), C++ permits you to declare functions to be inline. Such a declaration is a request to the compiler that it replace each call to the function with the fully expanded code of the function. For example:

inline int max(int a, int b){
  return a > b ? a : b ;
}

int main(){
   int temp = max(3,5);
    etc....
}