IIFE

Understanding immediately invocable lambdas in C++

This easy question tests your grasp of C++ lambda syntax and the practical reasons for using immediately invocable function expressions (IIFEs) in real code. It's a language-knowledge checkpoint that appears in coding interviews at firms that care about idiomatic modern C++.

When you see a lambda defined and called in the same expression, there's usually a deliberate design reason: scoping, const-correctness, or controlling initialization semantics. Understanding when and why to reach for this pattern—rather than just how to write it—shows you think intentionally about code structure.

• Lambda syntax and capture modes
• Variable scope and lifetime management
• Const-correctness and initialization patterns
• Code readability and intent signalling