Polymorphism

polymorphism.cpp

#include <iostream>
#include <regex>

using namespace std;

class AbstractEmployee
{
    // Returns true if got promotion
    virtual bool RequestPromotion() = 0;
    virtual void Work() = 0;
};

class Employee : AbstractEmployee
{
private:
    string Company;
    int Age;

protected:
    string Name;

public:
    // constructor
    Employee(string name, string company, int age)
    {
        Name = name;
        Company = company;
        Age = age;
    }

    // Setters and getters
    void setName(string value)
    {

        if (value.length() > 50)
        {
            return;
        }

        auto nameMatch = regex("^[a-zA-Z]+$");
        if (!regex_match(value, nameMatch))
        {
            return;
        }

        Name = value;
    }

    string getName()
    {
        return Name;
    }

    void setCompany(string company)
    {
        Company = company;
    }

    string getCompany()
    {
        return Company;
    }

    void setAge(int value)
    {
        if (value < 0)
        {
            return;
        }
        Age = value;
    }

    int getAge()
    {
        return Age;
    }

    void Introduce()
    {
        cout << Name << ", age " << Age << ", works at " << Company << ".\n";
    }

    bool RequestPromotion()
    {
        if (Age < 30)
        {
            cout << Name << " did not get promoted.\n";
            return false;
        }
        else
        {
            cout << Name << " got promoted.\n";
            return true;
        }
    }

    void Work() {
        cout << Name << " is working.\n";
    }
};

// Developer = child class, subclass
// Employee = parent class, super class
class Developer : public Employee
{
    string FavoriteLanguage;

public:
    Developer(string name, string company, int age, string favoriteLanguage)
        : Employee(name, company, age)
    {
        FavoriteLanguage = favoriteLanguage;
    }

    string getFavoriteLanguage()
    {
        return FavoriteLanguage;
    }

    void fixBug()
    {
        // Jonathan fixed a bug using Dart.
        cout << Name << " fixed a bug using " << FavoriteLanguage << ".\n";
    }

    void Introduce()
    {
        cout << Name << "'s favorite language is " << FavoriteLanguage << ".\n";
    }

    void Work() {
        fixBug();
    }
};

// Teacher
class Teacher : public Employee {
    string Subject;
public:
    Teacher(string name, string company, int age, string subject)
        : Employee(name, company, age)
    {
        Subject = subject;
    }

    void prepareLesson() {
        cout << Name << " is preparing a " << Subject << " lesson.\n";
    }

    void Work() {
        prepareLesson();
    }
};

int main()
{
    Employee bob = Employee("Bob", "Starbucks", 18);
    Employee mary = Employee("Mary", "Facebook", 30);
    Employee me = Developer("Jonathan", "SEU", 44, "Dart");
    Employee susan = Teacher("Susan", "Super High School", 51, "math");
    
    bob.Work();
    mary.Work();
    me.Work();
    susan.Work();
}