Re: [glas] Concept C++ [was Re: back to business}
From: Karl Meerbergen (karl.meerbergen_at_[hidden])
Date: 2006-11-23 02:39:02
One question that is on my mind for a while now is the following one:
the mathematical definition of e.g. magma is clear. When do two types
belong to the same magma? E.g. int + double is an operation between
different types but they belong to double. Is there a mechanism in your
concepts that takes care of this?
Another examples is vector<double> v, w ;
The expression v+w returns e.g.
add_vector< vector<double>, vector<double> >,
which is only evaluated at assignment, e.g. x=v+w.
Do you deal with this returntype in your concepts? I think this would be
On Wed, 2006-11-22 at 10:38 -0500, Peter Gottschling wrote:
> Well, I used ConceptGCC many times and it works quite well now. The
> fundamental concepts on the GLAS list, like ring and group, are
> implemented with concepts now and compiled with ConceptGCC. I published
> the results as technical report:
> There is amongst others an example to compute the power function with
> regard to an arbitrary binary function. There are different algorithms
> for magma, semi-group, monoid and groups. The concept compiler
> dispatches to the most appropriate.
> In another paper still pending I did performance experiments and it
> showed that the performance is the same as with gcc without concepts.
> There were occasionally some minor problems with ConceptGCC but Doug
> fixed most of them in the meantime. That said, the compiler is not in
> perfect production mode yet but it is already extremely useful for
> working with concepts.
> On 22.11.2006, at 08:52, Ian McCulloch wrote:
> > On Wed, 22 Nov 2006, Karl Meerbergen wrote:
> >> I think we should consider this. Is concept-gcc stable now?
> > I think it is, although last time I checked there were some issues with
> > compile times that ought to go away in the final version. Aside from
> > spending a few hours reading the proposal, I have never used concept
> > gcc.
> > Maybe someone else on this list has? My impression was though, it
> > would
> > be the killer feature for linear algebra libs.
> > Cheers,
> > Ian
> >> On Wed, 2006-11-22 at 14:36 +0100, Ian McCulloch wrote:
> >>> Hi Karl, Toon,
> >>> Have you considered using Concept-GCC ?
> >>> http://www.generic-programming.org/languages/conceptcpp/
> >>> Ian
> >>> _______________________________________________
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> >> --
> >> Karl Meerbergen
> >> Katholieke Universiteit Leuven
> >> Department of Computer Science
> >> E-mail: karl.meerbergen_at_[hidden]
> >> URL : http://www.cs.kuleuven.be/cwis/research/nalag/
> >> Phone : +32 16 327700 (secretary)
> >> Fax : +32 16 327996
> >> _______________________________________________
> >> glas mailing list
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> Peter Gottschling, Ph.D.
> Research Associate
> Open Systems Laboratory
> Indiana University
> 135 Lindley Hall
> Bloomington, IN 47405
> Tel.: +1-812-855-3608 Fax: +1-812-856-0853
> glas mailing list
-- Karl Meerbergen Katholieke Universiteit Leuven Department of Computer Science E-mail: karl.meerbergen_at_[hidden] URL : http://www.cs.kuleuven.be/cwis/research/nalag/ Phone : +32 16 327700 (secretary) Fax : +32 16 327996