Inheritance

[Murali]

Hi
I have 2 questions.
1) How do i make a class so that no other classes can't be derive from
my class?
2) Do i declare the constructor as private? Can any one explain when
exactly it is useful?

Thanks & Regards
Murali

 

[dasjotre]

Hi
I have 2 questions.
1) How do i make a class so that no other classes can't be derive from
my class?
2) Do i declare the constructor as private? Can any one explain when
exactly it is useful?

check FAQ
http://www.parashift.com/c++-faq-lite/strange-inheritance.html#faq-23.11

I personally prefer

class A // DON'T DERIVE FROM THIS !
...

 

[Rolf Magnus]

check FAQ
http://www.parashift.com/c++-faq-lite/strange-inheritance.html#faq-23.11

I personally prefer

class A // DON'T DERIVE FROM THIS !
..

I prefer letting the user of the class decide whether he finds it useful to
derive from it.

 

[osmium]

I prefer letting the user of the class decide whether he finds it useful
to
derive from it.

Which is exactly what was proposed in the message you're responding to.
Furthermore, it seems like good choice to me.

 

[James Kanze]

I prefer letting the user of the class decide whether he finds it useful to
derive from it.

Which is, of course, very poor engineering. You can't write
robust code if you don't know what it will be used for. If the
requirement specifications state that the class will be used as
a base class, you write it considerably differently than if they
don't.