The boilerplate expression templates have already been implemented for scalars, vectors and matrices. The original idea was to include the various matrix types and supply algorithms for the algebra that did not rely on LAPACK since Fortran layout or adaptation of it has not been implemented. At some point collaboration would probably have been necessary, either that or integration of a suitable library written in C++. Other commitments however have slowed progress and your observation about the work involved is well received. At the moment I'm not sure of the best way forward for the development of this part of the library. As far as the multi-dimensional arrays are concerned expression templates have not been implemented the rudiments were put in place for anyone to roll their own. In general though that will not be necessary since the intention was for them to be useful as is. Regards Brian On 6/18/11, Joel falcou <joel.falcou@gmail.com> wrote:
Some hints :
- using proto should simplifying the boilerplate of expression templates and give you flexible semantic over different type of containers.
- I strongly recommend to *not* rewrite linear algebra algorithm but to rely on matching patterns around them to feed them to the proper BLAS/LAPACK implmeentation calls.
Matrix/vector is non trivial amount of work (see our talk at boost'con 2010) and you'll have to consider a lot of side stuff if you want it to have decent performances.
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