[Dune] [#1004] Make VTKFunctionPtr a const-pointer

[Dune]

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

User who did this - Elias Pipping (pipping) 

Attached to Project - Dune
Summary - Make VTKFunctionPtr a const-pointer
Task Type - Feature Request
Category - File
Status - Unconfirmed
Assigned To - 
Operating System - Unspecified / All
Severity - Low
Priority - Normal
Reported Version - SVN (pre2.2)
Due in Version - Undecided
Due Date - Undecided
Details - The class VTKWriter from dune/grid/io/file/vtk/vtkwriter.hh
exposes a function

  void addVertexData (const VTKFunctionPtr & p)

where VTKFunctionPtr is defined as

    typedef shared_ptr< VTKFunction > VTKFunctionPtr;

This requires the VTKFunction that the VTKFunctionPtr points to to be writable, apparently for no reason. Replacing the typedef with

    typedef shared_ptr< VTKFunction const > VTKFunctionPtr;

would allow pointers to constant functions to be passed.

More information can be found at the following URL:
http://www.dune-project.org/flyspray/index.php?do=details&task_id=1004

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