Re: [ublas] ubals::matrix sharing storage with array

From: Michael Stevens (mail_at_[hidden])
Date: 2005-09-14 04:23:24

On Mittwoch 14 September 2005 09:06, Ott Toomet wrote:
> Dear Vardan and Michael,
>
> unfortunately shallow_array_adaptor does not work for me.  If I
> declare
>
> #define BOOST_UBLAS_SHALLOW_ARRAY_ADAPTOR
>
> it results compiler errors:
>
> g++ -c aakatse.c++ -O2 -Wall -Wno-unknown-pragmas  -I/usr/include
> In file included from /usr/include/boost/numeric/ublas/vector.hpp:23,
>                  from aakatse.c++:4:
> /usr/include/boost/numeric/ublas/storage.hpp:707: error: declaration of
> `class T' /usr/include/boost/numeric/ublas/storage.hpp:703: error:  shadows
> template parm `class T'
>
> even without any additonal code.
>
> Is it a problem with boost 1.32/gcc 3.4 or do I have to do someting in
> a different way?

It something that only recent(ish) 'gcc' complain about. This was the fix I 
just applied to 1.33. The change is fairly simple. The delaration round line 
707 need to change to
        template<class TT>
        struct leaker {
            typedef void result_type;
            typedef TT *argument_type;

            BOOST_UBLAS_INLINE
            result_type operator () (argument_type x) {}
        };

That is, the template parameter is renamed TT from T.

You can use array_adaptor but you need to bind it to an array after the 
container has been constructed thus:

double a[] = {-11, -12, -13, -14};
vector<double, array_adaptor<double> > v(4);
v.data ().resize (4, a);

Michael
-- 
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Michael Stevens Systems Engineering
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Navigation Systems, Estimation  and
                 Bayesian Filtering
    http://bayesclasses.sf.net
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