[ublas] Default constructable vector/matrix_expression

From: Michael Stevens (mail_at_[hidden])
Date: 2005-06-29 16:58:25

Dear All,

Does anyone know why the vector/matrix_expression class requires Default 
Constructable?

As far as I can see:
        a) uBLAS expressions templates don't require this
        b) Default constructed instances cannot be used, and if they were would fail 
nastily as they don't reference anything
        c) They allow the user to accidentally use some syntax that produces code 
that fails when run.

Obviously a fix would require some changes throughout uBLAS code and 
documentation. So I thought I would ask to find out if anyone knows why this 
exists.

A change would make sense as I'm experimenting with an extra 
vector/matrix_container class from which all container models would be 
derived. This would help implement alias optimisations.

Michael
-- 
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Michael Stevens Systems Engineering
34128 Kassel, Germany
Phone/Fax: [phone]
Navigation Systems, Estimation  and
                 Bayesian Filtering
    http://bayesclasses.sf.net
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