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This article explains C++ move semantics, covering the concepts of lvalues and rvalues, the syntax and rules of rvalue references, how std::move converts lvalues to rvalues, and demonstrates practical applications such as custom class move constructors, STL container optimizations, and return value optimization.
The article explains C++11 move semantics, showing how std::move forces rvalue treatment and how std::forward preserves value categories for perfect forwarding, illustrating copy vs. move constructors, custom move implementations, and the performance benefits of eliminating unnecessary copies.
Move semantics in C++11 let objects transfer ownership of resources via rvalue references and std::move, eliminating costly copies, improving performance, requiring explicit move constructors and assignment operators—preferably marked noexcept—to keep source objects valid, enable container optimizations, and work with NRVO when copying would otherwise occur.