Re: UBLAS: advice on argument types please

From: speedsnaii speedsnaii_at_[hidden])
Date: 2003-02-25 11:41:41

Hi Joerg,

thank you. I think I am starting to learn (steep slope ;-).

> 
> I'd tend to use
> 
> template<class E>
> void foo (vector_expression<E> &arg);
> 
> or
> 
> template<class E>
> void foo (const vector_expression<E> &arg);
> 

Can I see this as specifying the base classes of my argument types?

> > Should I use iterators for whattype? 
> 
> Unsure about that.
> 

I tried to do it, but there seem to be some problems with VC60 
(distance_type instead of difference_type, iterator_traits don't work 
because of unsopported partial specialization, ...)

> 
> > (Which container should I use in this case?)
> 
> No need to copy yet.
> 

Ok, these arguments are expressions. But now I ran into the following:

=============================================================
template<class E>
struct func {
    func(const matrix_expression<E>& arg) : e(arg) {}    
    typename E::value_type operator() ()
    { return e[e.size1()-1]; };
private:
    //const matrix_expression<E>& e;   // error-> size1 not a member 
of matrix_expression 
    const matrix_reference<E> e; // doesn't work either...
};

int main(int argc, char* argv[])
{
matrix<double> v (3,3);
    func<matrix<double> > f(v);
    
    f();

    return 0;
}
=============================================================

I think I do not yet understand of how to use the matrix_reference, 
do I?

Using matrix_const_reference instead gives me an error that I have no 
glue what is going on:
error C2143: syntax error : missing ';' before '<'

regards,
roland