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Possible Duplicate: How can moved objects be used? What constitutes a valid state for a “moved from” object in C++11? When implementing move semantics in C++11, should the moved-from object be left in a safe state, or can it be just left in a "junk" state? e.g. What is the preferred option to implement move constructor in the following example of a C++11 wrapper to a raw FILE* resource? // C++11 wrapper to raw FILE* class File { FILE* m_fp; public: // Option #1 File(File&& other) : m_fp(other.m_fp) { // "other" left in a "junk" state } // Option #2 File(File&& other) : m_fp(other.m_fp) { // Avoid dangling reference in "other" other.m_fp = nullptr; } ... };
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