How are base class constructors called in c++ [duplicate]

Answer 1

You do not need to call the base constructor in a derived one. This is done automatically - always. If you want to call a constructor explicitly you may do so at any time by specifying the class namespace and constructor (which should be the same) like this:

PointerToObject->ClassName::ClassName(Parameters);

(But this is considederd a "NoNo!" - bad style, because it should not be neccessary in case of good design)