C++ using this pointer in constructors

Question

In C++, during a class constructor, I started a new thread with this pointer as a parameter which will be used in the thread extensively (say, call

Answer 1

It can be potentially dangerous.

During construction of a base class any calls to virtual functions will not despatch to overrides in more derived classes that haven't yet been completely constructed; once the construction of the more derived classes change this changes.

If the thread that you kick-off calls a virtual function and it is indeterminate where this happens in relation to the completion of the construction of the class then you are likely to get unpredictable behaviour; perhaps a crash.

Without virtual functions, if the thread only uses methods and data of the parts of the class that have been constructed completely the behaviour is likely to be predictable.