60 lines
2.5 KiB
C++
60 lines
2.5 KiB
C++
// fig20_06.cpp
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// Demonstrating downcasting and runtime type information (RTTI).
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#include <fmt/format.h>
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#include <iostream>
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#include <typeinfo>
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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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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", 10000.0, .06};
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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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// polymorphically process each element in vector employees
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for (Employee* employeePtr : employees) {
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std::cout << fmt::format("{}\n", employeePtr->toString());
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// determine whether employeePtr points to a SalariedEmployee;
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// if not, dynamic_cast returns nullptr which evaluates to false
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if (auto ptr{dynamic_cast<SalariedEmployee*>(employeePtr)}) {
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double oldBaseSalary = ptr->getSalary();
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std::cout << fmt::format("old salary: ${:.2f}\n", oldBaseSalary);
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ptr->setSalary(1.10 * oldBaseSalary);
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std::cout << fmt::format(
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"new salary with 10% increase is: ${:.2f}\n",
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ptr->getSalary());
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}
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std::cout << fmt::format("earned ${:.2f}\n\n",
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employeePtr->earnings());
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}
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// display each object’s type
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for (const Employee* employeePtr : employees) {
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std::cout << fmt::format("{}\n", typeid(*employeePtr).name());
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}
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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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