factory methods.

[Aman]

why should factory methods be virtual in C++ ?
what would be the impact if they were not ?

 

[Gianni Mariani]

why should factory methods be virtual in C++ ?
what would be the impact if they were not ?

Why do you think you need a factory ?

Factories are usually used when you want to separate the implementation
from the interface.

Can you fill in the dots from there ?

 

[jeffc]

why should factory methods be virtual in C++ ?

So the correct subclass of object is created.

what would be the impact if they were not ?

The correct subclass of object might not be created.

 

[Chris Theis]

why should factory methods be virtual in C++ ?

Because a factory should be able to create different types of objects.
Probably you should think about the reason of using a factory once again.

what would be the impact if they were not ?

You'd have some more worries in your life....

Chris

 

[jeffc]

Because a factory should be able to create different types of objects.
Probably you should think about the reason of using a factory once again.

You'd have some more worries in your life....

I'm starting to think this was a homework question, verbatim.

 

[Jason Spashett]

Why do you think you need a factory ?

Factories are usually used when you want to separate the implementation
from the interface.

Can you fill in the dots from there ?

No, what about static factory methods? They can't be virtual.

 

[Aman Angrish]

heh heh,
no it's not a homework question !! (i'm lucky i don't get homework ).
just read this statement in Gamma (design patterns ) ,wanted to know
why.
Thanks for your inputs.
regards,
Aman.

 

[Gianni Mariani]

No, what about static factory methods? They can't be virtual.

What part of the fill-in-the-dots are you missing ?