Returned View

What this C++ language-knowledge question tests

This is a hard C++ question that probes deep understanding of reference semantics, object lifetime, and how views interact with underlying data. It's the kind of problem that separates candidates who have merely used C++ from those who understand its memory and binding model in detail.

Questions like this typically require you to trace through code execution carefully, accounting for when temporaries are created and destroyed, which objects are views versus copies, and what happens when a view outlives the object it refers to. The answer hinges on understanding the rules governing reference binding and the scope of temporary objects in C++.

• Reference binding rules and temporary lifetime extension
• Dangling references and undefined behaviour
• Return value semantics and copy elision
• View types and their relationship to underlying containers