[petsc-dev] MatMatMult double dispatch

[Jed Brown]

On Fri, Oct 28, 2011 at 15:14, Dmitry Karpeev <karpeev at mcs.anl.gov> wrote:

> I think it would, in fact, be useful to consider the triple-dispatch
> problem: if in A*B = C we are reusing C,
> its type might dictate a different implementation.  This can be sort of
> hacked with the double-dispatched routine
> internally examining the type of C, and dispatching again, if necessary.
>

Any sufficiently complicated C or Fortran program contains an ad hoc,
informally-specified, bug-ridden, slow implementation of half of Common
Lisp. -- Greenspun's Tenth Rule
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