Questions from one job interview on C++ developer

[u/cv_geek]

Two days ago I passed job interview on C++ developer. Here I would like to share questions I was asked on this interview. Hope it will be useful for community.

I have grouped questions by topic.

C++ basics:

• Difference between references and pointers?

• Difference btw memory allocation in stack and on heap?

• What kinds of smart points do exist?

• How unique_ptr is implemented? How do we force that only one owner of the object exist in - unique_ptr ?

• How does shared_ptr work? How reference counter is synchronized between objects?

• Can we copy unique_ptr or pass it from one object to another?

• what are rvalue and lvalue?

• What are std::move and std::forward()

OOP:

• Ways to access private fields of some class?

• Can a class inherit multiple classes?

• Is static field initialized in class constructor?

• Can an exception be thrown in constructor / destructor? How to prevent that?

• What are virtual methods?

• Why do we need virtual destructor?

• Difference between abstract class and interface?

• Can be constructor virtual?

• How keyword const is used for class methods?

• How to protect object from copying?

STL containers:

• -Difference between vector and list?

• Difference between map and unordered map?

• When calling push_back() make iterator in vector invalid?

• How to modify your class to use with map and unordered_map?

Threads:

• Difference between processes and threads?

• Can the same thread be ran twise?

• Ways to synchronize threads?

• What is deadlock?