Object creation and destruction flow in C++ - Cheat Sheet & Quick Revision

Recall & Review

beginner

What happens first when an object is created in C++?

The constructor of the object is called to initialize it.

beginner

What is the role of a destructor in C++?

A destructor is called automatically when an object goes out of scope or is deleted to clean up resources.

intermediate

In what order are constructors called when creating an object with inheritance?

Base class constructors are called first, then derived class constructors.

intermediate

In what order are destructors called when an object with inheritance is destroyed?

Derived class destructors are called first, then base class destructors.

intermediate

What happens if you forget to define a destructor for a class that manages dynamic memory?

Memory leaks can occur because the allocated memory is not freed properly.

Which function is called automatically when an object is created?

A Constructor

B Destructor

C Copy constructor

D Assignment operator

The constructor initializes the object when it is created.

When is a destructor called?

A When an object is created

B When a class is defined

C When an object goes out of scope or is deleted

D When a function is called

Destructors clean up resources when an object is destroyed.

In inheritance, which constructor is called first?

A Derived class constructor

B Base class constructor

C Destructor

D Copy constructor

Base class constructors run before derived class constructors.

What is the order of destructor calls in inheritance?

A Base class destructor then derived class destructor

B Only derived class destructor

C Only base class destructor

D Derived class destructor then base class destructor

Derived class destructors run before base class destructors.

What problem can occur if a destructor is missing for a class managing dynamic memory?

A Memory leak

B Syntax error

C Faster execution

D No problem

Without a destructor freeing memory, leaks happen.

Explain the flow of object creation and destruction in C++ including inheritance.

Think about the order constructors and destructors run in inheritance.

Why is it important to define a destructor in classes that allocate dynamic memory?

Consider what happens if memory is not freed.