[Dune] Dune::IdSet

[Andreas Dedner]

If an entity is available both on proecessor i and j then that entity will
have the same global id but different local ids.

Guo Hua wrote:
> Hi everyone
>
> I feel confused when reading the explanations of these two functions
> in the class Dune::Grid< dim, dimworld, ct, GridFamily >.
>
> const Codim< 0 >::GlobalIdSet & globalIdSet () const
>  	return const reference to the grids global id set
>
> const Codim< 0 >::LocalIdSet & localIdSet () const
>  	return const reference to the grids local id set 
>
> Would you mind to make it more clear? Especially the differences of two.
> Thanks a lot!
>
> Cheers,
> Hua
>
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