15 Library introduction [library]

15.4 Method of description (Informative) [description]

15.4.2 Other conventions [conventions] Functions within classes [functions.within.classes]

For the sake of exposition, [language.support] through [thread] and [depr] do not describe copy/move constructors, assignment operators, or (non-virtual) destructors with the same apparent semantics as those that can be generated by default ([class.copy.ctor], [class.copy.assign], [class.dtor]).
It is unspecified whether the implementation provides explicit definitions for such member function signatures, or for virtual destructors that can be generated by default.