77 lines
3.3 KiB
C++
77 lines
3.3 KiB
C++
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// fig10_17.cpp
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// Processing Employee derived-class objects with variable-name handles
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// then polymorphically using base-class pointers and references
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#include <fmt/format.h>
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#include <iostream>
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#include <vector>
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#include "Employee.h"
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#include "SalariedEmployee.h"
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#include "CommissionEmployee.h"
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void virtualViaPointer(const Employee* baseClassPtr); // prototype
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void virtualViaReference(const Employee& baseClassRef); // prototype
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int main() {
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// create derived-class objects
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SalariedEmployee salaried{"John Smith", 800.0};
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CommissionEmployee commission{"Sue Jones", 10000, .06};
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// output each Employee
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std::cout << "EMPLOYEES PROCESSED INDIVIDUALLY VIA VARIABLE NAMES\n"
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<< fmt::format("{}\n{}{:.2f}\n\n{}\n{}{:.2f}\n\n",
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salaried.toString(), "earned $", salaried.earnings(),
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commission.toString(), "earned $", commission.earnings());
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// create and initialize vector of base-class pointers
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std::vector<Employee*> employees{&salaried, &commission};
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std::cout << "EMPLOYEES PROCESSED POLYMORPHICALLY VIA"
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<< " DYNAMIC BINDING\n\n";
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// call virtualViaPointer to print each Employee
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// and earnings using dynamic binding
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std::cout << "VIRTUAL FUNCTION CALLS MADE VIA BASE-CLASS POINTERS\n";
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for (const Employee* employeePtr : employees) {
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virtualViaPointer(employeePtr);
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}
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// call virtualViaReference to print each Employee
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// and earnings using dynamic binding
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std::cout << "VIRTUAL FUNCTION CALLS MADE VIA BASE-CLASS REFERENCES\n";
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for (const Employee* employeePtr : employees) {
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virtualViaReference(*employeePtr); // note dereferenced pointer
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}
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}
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// call Employee virtual functions toString and earnings via a
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// base-class pointer using dynamic binding
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void virtualViaPointer(const Employee* baseClassPtr) {
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std::cout << fmt::format("{}\nearned ${:.2f}\n\n",
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baseClassPtr->toString(), baseClassPtr->earnings());
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}
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// call Employee virtual functions toString and earnings via a
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// base-class reference using dynamic binding
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void virtualViaReference(const Employee& baseClassRef) {
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std::cout << fmt::format("{}\nearned ${:.2f}\n\n",
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baseClassRef.toString(), baseClassRef.earnings());
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}
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/**************************************************************************
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* (C) Copyright 1992-2022 by Deitel & Associates, Inc. and *
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* Pearson Education, Inc. All Rights Reserved. *
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* *
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* DISCLAIMER: The authors and publisher of this book have used their *
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* best efforts in preparing the book. These efforts include the *
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* development, research, and testing of the theories and programs *
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* to determine their effectiveness. The authors and publisher make *
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* no warranty of any kind, expressed or implied, with regard to these *
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* programs or to the documentation contained in these books. The authors *
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* and publisher shall not be liable in any event for incidental or *
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* consequential damages in connection with, or arising out of, the *
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* furnishing, performance, or use of these programs. *
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**************************************************************************/
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