Are move constructors produced automatically?

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A move constructor for a class X is implicitly declared as defaulted exactly when

  • X does not have a user-declared copy constructor,
  • X does not have a user-declared copy assignment operator,
  • X does not have a user-declared move assignment operator,
  • X does not have a user-declared destructor, and
  • the move constructor would not be implicitly defined as deleted.

So for example, if your class has a class type data member that does not have a move constructor, your class will not get a move constructor even if it doesn’t have any copy/move constructor declared, because the implicitly declared move constructor would be defined as deleted (because of that data member).

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