// fig10_25.cpp
// Processing Employee derived-class objects with variable-name handles 
// then polymorphically using base-class pointers and references
#include <fmt/format.h>
#include <iostream>
#include <vector>
#include "Employee.h"
#include "SalariedEmployee.h" 
#include "CommissionEmployee.h"  

void virtualViaPointer(const Employee* baseClassPtr); // prototype
void virtualViaReference(const Employee& baseClassRef); // prototype

int main() {
   // create derived-class objects                        
   SalariedEmployee salaried{"John Smith", 800.0};
   CommissionEmployee commission{"Sue Jones", 10000, .06};

   // output each Employee
   std::cout << "EMPLOYEES PROCESSED INDIVIDUALLY VIA VARIABLE NAMES\n"
      << fmt::format("{}\n{}{:.2f}\n\n{}\n{}{:.2f}\n\n",
            salaried.toString(), "earned $", salaried.earnings(),
            commission.toString(), "earned $", commission.earnings());

   // create and initialize vector of base-class pointers        
   std::vector<Employee*> employees{&salaried, &commission};

   std::cout << "EMPLOYEES PROCESSED POLYMORPHICALLY VIA"
      << " DYNAMIC BINDING\n\n";

   // call virtualViaPointer to print each Employee
   // and earnings using dynamic binding
   std::cout << "VIRTUAL FUNCTION CALLS MADE VIA BASE-CLASS POINTERS\n";

   for (const Employee* employeePtr : employees) {
      virtualViaPointer(employeePtr);
   }

   // call virtualViaReference to print each Employee
   // and earnings using dynamic binding
   std::cout << "VIRTUAL FUNCTION CALLS MADE VIA BASE-CLASS REFERENCES\n";

   for (const Employee* employeePtr : employees) {
      virtualViaReference(*employeePtr); // note dereferenced pointer
   }
}

// call Employee virtual functions toString and earnings via a   
// base-class pointer using dynamic binding                   
void virtualViaPointer(const Employee* baseClassPtr) {
   std::cout << fmt::format("{}\nearned ${:.2f}\n\n",
      baseClassPtr->toString(), baseClassPtr->earnings());
}

// call Employee virtual functions toString and earnings via a  
// base-class reference using dynamic binding                
void virtualViaReference(const Employee& baseClassRef) {
   std::cout << fmt::format("{}\nearned ${:.2f}\n\n",
      baseClassRef.toString(), baseClassRef.earnings());
}


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