// fig09_18.cpp
// public member function that
// returns a reference to private data.
#include <iostream>
#include <fmt/format.h>
#include "Time.h" // include definition of class Time

int main() {
   Time t{}; // create Time object

   // initialize hourRef with the reference returned by badSetHour
   int& hourRef{t.badSetHour(20)}; // 20 is a valid hour 

   std::cout << fmt::format(
      "Valid hour before modification: {}\n", hourRef);
   hourRef = 30; // use hourRef to set invalid value in Time object t
   std::cout << fmt::format(
      "Invalid hour after modification: {}\n\n", t.getHour());

   // Dangerous: Function call that returns a reference can be 
   // used as an lvalue! POOR PROGRAMMING PRACTICE!!!!!!!!
   t.badSetHour(12) = 74; // assign another invalid value to hour

   std::cout << "After using t.badSetHour(12) as an lvalue, "
      << fmt::format("hour is: {}\n", t.getHour());
}

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