Just the basics

What this C++ variant fundamentals question tests

This is an easy practice question that checks your understanding of std::variant and how it behaves when holding different types. It's the kind of language-knowledge question that appears in C++ technical screens, particularly at firms where precision around type systems matters.

To answer correctly, you need to understand how a variant stores and reports its active type, what operations are safe on a variant at runtime, and how to reason through code that constructs or modifies a variant's state. The question rewards careful reading of the actual code path being executed.

• Variant construction and type activation
• Runtime type queries and index tracking
• Value semantics and copy/move behaviour