virtual functions

[rajesh kalra]

do the virtual mechanism works when virtual functions are called in
constructors?

 

[Barry]

do the virtual mechanism works when virtual functions are called in
constructors?

Never do it!
http://www.artima.com/cppsource/nevercall.html

 

[Ian Collins]

do the virtual mechanism works when virtual functions are called in
constructors?

Yes, but take care if you do!

The function called is the one in the class under construction, or one
of its base classes (12.7.3). If a function is pure virtual, it can't
be called unless it has been overridden.

 

[Juha Nieminen]

Never do it!
http://www.artima.com/cppsource/nevercall.html

Do Java and C# call the derived implementations of virtual functions
even though the derived part has yet not been constructed (its
constructor has not been called yet)?

 

[Juha Nieminen]

Yes, but take care if you do!

Curiously, it's even possible to call base class functions *before*
the base class part of the object has been constructed at all, using a
small trick (which even more curiously is legal C++, although of course
extremely not recommended).

 

[Barry]

Do Java and C# call the derived implementations of virtual functions
even though the derived part has yet not been constructed (its
constructor has not been called yet)?

Yes, both

 

[James Kanze]

Do Java and C# call the derived implementations of virtual
functions even though the derived part has yet not been
constructed (its constructor has not been called yet)?

Don't know about C#, but Java does. It can easily be a source
of strange errors, too.

 

[ManicQin]

Curiously, it's even possible to call base class functions *before*
the base class part of the object has been constructed at all, using a
small trick (which even more curiously is legal C++, although of course
extremely not recommended).

Can you post the trick (or refer to it)?
Just for the fun of it.
Thanks