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Why can’t a volatile object call a non-volatile member function?
In case of const, it makes sense that calling a non-const member function violates the constness of the the object and hence it is prohibited. But why in the case of volatile?
It’s just the same for volatile. Volatile means every access to an object is a visible side effect and cannot be eliminated. If you called a nonvolatile method on a volatile object, you would violate this property (because the nonvolatile method would treat the object just as a normal object). Therefore, it is impossible.