Moving between pool-managed vectors

What this C++ vector memory-management question tests

This is a medium-difficulty C++ language-knowledge question that probes your understanding of how standard-library containers manage memory and what happens when objects are moved between allocators or storage pools. It rewards careful attention to constructor semantics and lifetime rules.

To solve problems like this, you need to trace the execution path carefully, distinguishing between shallow moves, deep copies, and allocator propagation. The question exercises your ability to reason about object state across operations—a skill that matters when debugging subtle memory issues or optimizing hot code paths in low-latency systems.

• Move semantics and move constructors
• Allocator traits and propagation
• Vector reallocation and iterator validity
• Object initialization and destruction order