A Destructive Relationship

Test your C++ programming skills by solving the given puzzle about destructors and virtual functions.

We'll cover the following

Puzzle code

Carefully read the code given below:

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#include <iostream>
#include <memory>
struct Widget
{
    virtual void draw() { std::cout << "Widget draw\n"; }
    virtual ~Widget() { std::cout << "Widget destructor\n"; }
};
struct Button : public Widget
{
    void draw() override { std::cout << "Button draw\n"; }
    ~Button() override { std::cout << "Button destructor\n"; }
};
int main()
{
    std::unique_ptr<Widget> widget = std::make_unique<Button>();
    widget->draw();
}

Your task: Guess the output

Try to guess the output of the above code. Attempt the following quiz to assess your understanding.

Q

What is the expected output of the above code?

A)
Widget draw
Button draw
Button destructor
Widget destructor
B)
Button draw
Button destructor
Widget destructor
C)
Widget draw
Button destructor
Widget destructor
D)
Button draw
Button destructor

Let’s discuss this code and output together in the next lesson.

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