dolfin team mailing list archive

[Anders Logg <logg@xxxxxxxxx>]

I've thought about this some more and I think that it can make sense
to template over type, not in MeshDomains itself but in a new class
MeshMarkers. The class MeshMarkers will be similar to MeshFunction but
differs in that it stores markers for only a subset and the markers
are identified by cell number and local entity number. Then
MeshDomains can use MeshMarkers internally (for uint).

It does not make sense to template MeshDomains itself, as that should
be an integral part of the Mesh class and DOLFIN should interpret its
data during assembly and setting boundary conditions.

--
Anders


On Mon, Aug 29, 2011 at 01:42:50PM -0700, Garth N. Wells wrote:
>
>
> On 29/08/11 10:43, Anders Logg wrote:
> > On Mon, Aug 29, 2011 at 07:17:27AM -0700, Garth N. Wells wrote:
> >
> >> I had in mind that where you have 'uint subdomain' that this
should
> >> be templated so that any data can be attached.
> >
> > I thought of it but couldn't think of any good use for it
>
> Is that a good reason? ;)
>
> > so I decided
> > to go with 'uint'. Is there a compelling reason for it or can we add
> > it later if we should need it?
> >
>
> I don't think that it would be too difficult. I've used MeshFunctions
> with non-primitive data types, so I imagine that it could also be useful
> on subsets of entities.
>
> Garth
>
> >> Also, since objects could
> >> be attached to only a very small subset of mesh entities, is it
> >> necessary to create mesh functions? What about just a map/vector of tuples?
> >
> > The conversion to MeshFunctions is practical since it means we can
> > plug it directly into the assembler which relies on MeshFunctions for
> > checking the subdomain number of the current cell or facet. It might
> > be possible to do it the other way around, iterate over subdomains and
> > assemble on each, but that requires a rewrite of the assembler.
> >
> > For boundary conditions, the conversion is not necessary.
> >
> >> Garth
> >>
> >>
> >>
> >> On 29/08/11 06:27, noreply@xxxxxxxxxxxxx wrote:
> >>> ------------------------------------------------------------
> >>> revno: 6145
> >>> committer: Anders Logg <logg@xxxxxxxxx>
> >>> branch nick: work
> >>> timestamp: Mon 2011-08-29 15:25:38 +0200
> >>> message:
> >>>   Add missing files
> >>> added:
> >>>   dolfin/mesh/MeshDomains.cpp
> >>>   dolfin/mesh/MeshDomains.h
> >>>
> >>>
> >>
> >>
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