C++ Polymorphism Question

Introduction

Write a program that defines a base class with a pure virtual member function.

Create a derived class that overrides a virtual function in the base class.

Create a polymorphic object of a derived class through a unique pointer to a base class.

Invoke the overridden member function through a unique pointer.

You can use the following code structure: 

#include <iostream> 

int main() 
{ 
    //your code here
} 



#include <iostream> 
#include <memory> 

class BaseClass 
{ 
public: 
    virtual void dowork() = 0; 
    virtual ~BaseClass() {} 
}; 

class DerivedClass : public BaseClass 
{ 
public: 
    void dowork() override 
    { 
        std::cout << "Do work from a DerivedClass." << '\n'; 
    } 
}; 

int main() 
{ 
    std::unique_ptr<BaseClass> p = std::make_unique<DerivedClass>(); 
    p->dowork(); 
} // p1 goes out of scope here

Here the override specifier explicitly states that the dowork() function in the derived class overrides the virtual function in the base class.

Here we used the unique pointer to create and automatically destroy the object and deallocate the memory one the pointer goes out of scope in the main() function.




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