Python and generic programming

[Jive]

I take it the ampersand is a neologism in 2.4?

Jive

jdadson at yahoo dott com

"Ian Bicking" <ianb at colorstudy.com> wrote in message
news:mailman.6643.1100939117.5135.python-list at python.org...
> Jive Dadson wrote:
> > If you have, for example, several data-types for matrices, how do you
> > write code that will automatically find the right routine for quickly
> > multiplying a vector by a diagonal matrix represented as a vector, and
> > automatically call the right code for multiplying by a sparse matrix
> > represented by some sparse coding, etc?
>
> I haven't been following this thread, but Phillip Eby's recent
> implementation of generic functions should be mentioned if it hasn't
> been already:
>
> http://dirtsimple.org/2004/11/generic-functions-have-landed.html
>
> It might look something like this:
>
> @dispatch.on('m1', 'm2')
> def matrix_mul(m1, m2):
>      "Multiply two matrices"
>
> @matrix_mul.when(VectorMatrix, SparseMatrix)
> def matrix_mul_sparse(m1, m2):
>      "Special implementation"
>
>
> -- 
> Ian Bicking  /  ianb at colorstudy.com  / http://blog.ianbicking.org