[Dune] MCMGMapper

[Carsten Graeser]

Dear Dune,
currently the MCMGMapper gets the Layout class template as template parameter
and uses a static instance of this class to determine if a GeometryType should be
counted by the mapper. This is done by using a nonstatic method of this instance
Is there any (e.g. performance-) reason why the Layout instance is static ?

Otherwise it would be nice to use a nonstatic member instead. Then one could
add contructors to the mapper taking a Layout instance which is copied. The
current constructor would just use the default constructor of the Layout class.

While this would not brake existing code (except for the ugly case it relies on the
use of single static member) it provides the possibility to use mappers for
different codims having the same type. Thus one could use an array containing
a mapper for each codim.

Please find the implementation of this proposal attached. If there are no objections
it would be nice if someone could commit it.

Best regards
Carsten


-- 
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Carsten Gräser           | phone: +49-30 / 838-75349
Freie Universität Berlin | fax  : +49-30 / 838-54977
Institut für Mathematik  | email: graeser at math.fu-berlin.de
Arnimallee 6             |
14195 Berlin, Germany    | URL  : http://page.mi.fu-berlin.de/graeser
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