
Ublas : 
From: Gunter Winkler (guwi17_at_[hidden])
Date: 20051019 02:46:55
On Tuesday 18 October 2005 22:51, Shawn D. Pautz wrote:
> Does the Matrix concept require a find2 member function? My locally
> defined matrix class does not work with lu_factorize (with pivots)
> unless I provide that function. Alternatively, do some of the ublas
> algorithms have stronger requirements on the matrix classes than defined
> by the Matrix concept?
Some matrix proxies (row and matrix_vector_range) use find2 to obtain
iterators pointing to begin and end of the data. To be more precise: nearly
all (const_)iterators use find to compute pointers to the data.
I don't think find2 should be part of the matrix concept, because it is only
used internally. But if you create your own matrix class  you have to
provide this helper function.
mfg
GuWi