What is std::move and when should you use it?

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**std::move** — casts an lvalue to an rvalue reference, enabling move semantics. ```cpp #include #include std::string createString() { std::string s = "hello"; return std::move(s); // Move out of s } // Perfect forwarding with std::move void process(std::string&& s) { // Use rvalue reference } std::string a = "test"; process(std::move(a)); // a is now in moved-from state ``` **Key rules:** - Use std::move when transferring ownership. - After std::move, the original object is in a valid but unspecified state. - Do not use std::move for return values (NRVO handles this). - std::move itself does not move anything — it only casts.

C++: What is std::move and when should you use it?