Is there any need to create virtual constructor for a class in C++?

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Hi,
Is it possible to create 'Virtual Constructor' programetically in C++.
I don't think so.
If you have any concrete idea on this then please share it.Thanks

Posted 29-May-11 9:55am

pjhelp

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Solution 2

There is no virtual constructor in C++, But why you need it.

If you look what the virtual distructor do, then you find that Actually there is no need (meaning) of virtual constructor.

Posted 29-May-11 17:32pm

Ashish Tyagi 40

Updated 6-Jun-11 18:01pm

v2

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Sergey Alexandrovich Kryukov 7-Jun-11 0:32am

Lie. However, I understand it's not intentional but based on lack of understanding OOP in wider scope then C++, created much later then fully-fledged variants of OOP.
--SA

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Sergey Alexandrovich Kryukov · Accepted Answer · 2011-05-29T10:34:00

There is a concept of virtual constructor in some languages where is it extremely useful. One example is Delphi Pascal, see http://en.wikipedia.org/wiki/Embarcadero_Delphi[^].

In C++ virtual constructors are not allowed and such techniques are not applicable. The closest possible concept is factory, especially abstract factory. Please see http://en.wikipedia.org/wiki/Factory_method_pattern[^], http://en.wikipedia.org/wiki/Abstract_factory_pattern[^].

Specifically to C++, please see ++:
http://sourcemaking.com/design_patterns/factory_method/cpp/1[^],
http://sourcemaking.com/design_patterns/abstract_factory/cpp/1[^],
http://sourcemaking.com/design_patterns/abstract_factory[^],
http://login2win.blogspot.com/2008/05/c-factory-pattern.html[^].

That was about classical factory approaches.
This CodeProject article shows a different generic approach:
Generic Class Factory[^].

—SA