C++23 enables implicit move for rvalue reference returns without std::move

C++23 closes a long-standing gap in the language's move semantics by making implicit moves work for rvalue reference returns. Previously, functions returning an rvalue reference parameter required explicit std::move to avoid copies, creating inconsistency with other return-value optimizations. The new rule means code like `return val;` in a function taking `Apple&& val` will now perform a move rather than a copy, matching the behavior developers intuitively expect.

The change primarily affects two scenarios: functions returning an rvalue reference parameter directly, and functions returning an rvalue reference type. In both cases, the compiler now generates move operations automatically. This eliminates the need for manual std::move in these contexts, reducing boilerplate while maintaining performance. The improvement is particularly noticeable in generic code where type traits might otherwise force explicit moves.

While this is a welcome simplification, it doesn't eliminate all cases where std::move remains necessary. The change only applies to rvalue reference returns - other scenarios like conditional returns or returning members still require explicit moves. Engineers should note that this is a C++23 feature, meaning adoption depends on compiler support and project migration timelines. The change also doesn't affect NRVO, which remains non-guaranteed in many cases.

The practical impact is twofold: first, it reduces cognitive load by making move semantics more consistent across different return patterns. Second, it prevents subtle performance bugs where developers might forget std::move in these specific cases. However, teams will need to update their style guides and static analysis rules to account for the new implicit behavior, particularly in codebases that previously enforced explicit std::move in all return contexts.