Re: Dynamic polymorphism vs. Static polymorphism

From:

Alan Johnson <alanwj@no.spam.stanford.edu>

Newsgroups:

comp.lang.c++

Date:

Tue, 30 May 2006 11:22:38 -0700

Message-ID:

<e5i2hf$jug$1@news.Stanford.EDU>

Krivenok Dmitry wrote:

Hello all!

Perhaps the most important feature of dynamic polymorphism is
ability to handle heterogeneous collections of objects.
("C++ Templates: The Complete Guide" by David Vandevoorde
and Nicolai M. Josuttis. Chapter 14.)

How to implement analogue of this technique via static polymorphism?
Perhaps there is special design pattern for this purpose...

Thanks!

What is the goal you are trying to accomplish?

If I had to guess, you are either trying to create some sort of compile
time container, or a run time container that supports heterogenous
types. In the former case, some variation on the type lists may be what
you want (see <url: http://www.ddj.com/dept/cpp/184403813>). In the
latter case, well, that isn't something that compile time polymorphism
can do for you. If the types you want to store have the same interface,
then use run time polymorphism. That is why it exists. If they don't,
then some form of discriminated union may do what you want.

--
Alan Johnson