[Dune] [#818] Topological embedding and indices of subentities are missing

[Dune]

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A new Flyspray task has been opened.  Details are below. 

User who did this - Carsten Gräser (Carsten) 

Attached to Project - Dune
Summary - Topological embedding and indices of subentities are missing
Task Type - Feature Request
Category - Grid
Status - New
Assigned To - 
Operating System - Unspecified / All
Severity - Low
Priority - Normal
Reported Version - SVN (pre2.1)
Due in Version - Undecided
Due Date - Undecided
Details - Currently there is no information on the embedding of subentities available. If you e.g. have an element e you can not get the local index of the i-th vertex of some e.subEntity<c>(j) within e. Furthermore you can not even obtain the index/id of this vertex.

This fact makes the subEntity method of Entity<0> and the iterators and geometries of codim 0<c<dim entities almost useless.

As a first step I propose to add the subIndex/subId method also for codim c>0 entities. Then one could construct the embedding at least by comparing indices/ids.

Furthermore it would be nice to provide the embedding directly similar to the subEntity method of the reference elements.

More information can be found at the following URL:
http://www.dune-project.org/flyspray/index.php?do=details&task_id=818

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