[Dune] Question about dune-grid-howto/shapefunctions.hh

[Christian Engwer]

Hi,

the file mentioned in the first post is part of the grid-howto. The
reason that it is a singleton is, that the shape function is always
the same, no matter which element you are working on. Thus there is no
need to recreate it. A singleton makes sure that there is only one
instance of certain object and avoids expensive recreation of that
object.

Ciao
Christian

On Fri, Apr 08, 2011 at 04:21:04PM +0200, Carsten Gräser wrote:
> Hello,
> 
> Am 08.04.2011 15:33, schrieb Jayesh Badwaik:
> > Hi,
> > 
> > I am using the shapefunctions.hh file as the shapefunctions for my fem
> > program and i was wondering
> > why is the class written as a singleton class?
> > Any specific reason?
> there's no such file in the core modules. As far as I remember there was one
> in the dune-disc module. This module is deprecated and no longer maintained
> for at least one year. There is a core module dune-localfunctions containing
> shape functions now.
> 
> Best,
> Carsten
> 
> 
> 
> > 
> > Cheers and Regards,
> > Jayesh Vinay Badwaik
> > -----------------------------------------------------------------------------------------------------------
> > 
> > We are servants rather than masters in mathematics   --- Charles Hermite
> > 
> 
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