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Message: [QUOTE="Andrey Tarasevich, post: 2565919"] They are not called "default" functions. They are called "implicitly declared/implicitly defined" functions. The term "default" in this context means something completely different from what you think it means (see other replies). And the term "implemented" is also unclear. They are not "implemented". They are "declared" and, if necessary, "defined" implicitly by the compiler. For a class 'A' defined as above, the compiler will implicitly _declare_ default constructor 'A::A()', copy constructor 'A::A(const A&)', copy assignment operator 'A& A::operator=(const A&)' and destructor 'A::~A()'. The compiler will implicitly _define_ the aforementioned functions only if they are used in the program. They are not used in your program. More precisely, I don't see any program at all, therefore there's no way to say whether they will be defined or not. No. See above. [/QUOTE]