class TRootIOCtor

TRootIOCtor

Helper class used to mark a constructor to be used by ROOT instead
of the default constructor.
If rootcint sees in a class declaration of the class MyClass:
MyClass(TRootIOCtor*);
This constructor will be used instead of the default constructor.

Also the pragma:
#pragma link C++ ioctortype MyMarker;
can be used to tell rootcint that a constuctor taking a MyMarker*
should be used whenever available.