[Dune] [#651] Declaration of hasHierarchicIndexSet for GeometryGrid (Attachment added)

[Dune]

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User who did this - Oliver Sander (sander) 

Attached to Project - Dune
Summary - Declaration of hasHierarchicIndexSet for GeometryGrid
Task Type - Bug Report
Category - Grid
Status - New
Assigned To - 
Operating System - Unspecified / All
Severity - Medium
Priority - Normal
Reported Version - SVN
Due in Version - Undecided
Due Date - Undecided
Details - While playing around with GeometryGrid I found out that code will only compile if I declare

namespace Dune
{

  namespace Capabilities
  {

    template< class Grid >
    struct hasHierarchicIndexSet
    {
      static const bool v = false;
    };

    template< class Grid >
    struct hasHierarchicIndexSet< const Grid >
    {
      static const bool v = hasHierarchicIndexSet< Grid >::v;
    };

  }

}

early enough. In fact, this piece of code can also be found in the GeometryGrid unit test.  If it is left out, the compiler objects:

/export/local-1/daten/users/sander/dune/dune-grid/dune/grid/geometrygrid/grid.hh: In instantiation of ‘Dune::GeometryGrid<Dune::SGrid<2, 2, double>, DeformationFunction>’:
dune_semilagrangian.cc:74:   instantiated from here
/export/local-1/daten/users/sander/dune/dune-grid/dune/grid/geometrygrid/grid.hh:280: error: incomplete type ‘Dune::Capabilities::hasHierarchicIndexSet<Dune::SGrid<2, 2, double> >’ used in nested name specifier


Is this a bug or a feature?  If it is a feature, could this please be documented somewhere?  I would never have guessed the magic code snippet if I hadn't found in the unit test.

A full test case is attached.


One or more files have been attached.

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http://www.dune-project.org/flyspray/index.php?do=details&task_id=651

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