Making a copy of a managed vector

Understanding copy semantics and move semantics in C++

This is a hard C++ language-knowledge question that tests your grasp of how managed containers handle copying and resource ownership. It requires you to trace through the lifetime of objects and predict what a program outputs based on the rules of copy construction, move semantics, and object destruction.

To solve this, you need to understand when the compiler invokes copy constructors versus move constructors, how temporary objects are handled, and what state a container is in after various operations. The question rewards careful reading of the code flow and precise mental execution of constructor and destructor calls. Interviewers use this type of question to verify that you can reason about modern C++ resource semantics without relying on guesswork.

• Copy constructor and copy assignment semantics
• Move constructor and move assignment semantics
• Temporary object lifetime and elision
• Container state after operations like copy, move, and reassignment