CPP Design Patterns & Architecture 2

Question 1

Which pattern ensures a class has only one instance and provides a global access point?

Accepted Answer

Singleton

Answer

The Singleton pattern restricts instantiation of a class to one object and provides a static method to access it.

Question 2

In the Composite pattern, what role does the 'Leaf' class play?

Accepted Answer

It is a primitive object with no children

Answer

A Leaf represents a basic element with no children, implementing the component interface directly.

Question 3

Which design pattern converts the interface of a class into another interface that clients expect?

Accepted Answer

Adapter

Answer

The Adapter pattern wraps an existing class to make its interface compatible with another interface.

Question 4

What problem does the Chain of Responsibility pattern solve?

Accepted Answer

Passing a request along a chain of handlers without knowing which will handle it

Answer

Chain of Responsibility lets handlers decide whether to process a request or pass it to the next handler in the chain.

Question 5

In C++, the 'std::function' combined with lambdas is most closely associated with which pattern?

Accepted Answer

Strategy

Answer

The Strategy pattern defines a family of algorithms that can be swapped at runtime, matching how std::function holds interchangeable callables.

(CPP) C++ Programming Professional Certificate Practice Test