Creating a wrapper function with int parameter, for a function using an enum parameter

Question

When a function f uses an enum as argument, what's the simplest way to call f with an int instead?

• (1) This:

  enum State {low=5, high=10};
  
  void f(State t) {
  }
  
  void g(int t) {
      f(t);
  }
  
  int main() {
    g(5);
  }
  

  triggers the error invalid conversion from 'int' to 'State' [-fpermissive].

• (2) Is it safe to do a simple cast in this case?

  void g(int t) {
      f((State) t);
  }
  

  or is there a better way?

• (3) The only "correct" solution I found to have a function g with an int parameter is:

  void g(int t) {
      switch (t) {
          case 5: f(low); break;
          case 10: f(high); break;
      }
  }
  

Which of these solutions are correct?

I've already read converting from int to enum and using enum says invalid conversion from 'int' to 'type', but I'm looking for a simpler solution without complexity like static_cast<periods>(atoi(min_prd.c_str())), and I want to compare the different possible solutions, thus it is not a duplicate. Also, my question is not covered by What is the difference between static_cast<> and C style casting?.