[Dune] Problem with compiling grid.globalIdSet()

[Aleksejs Fomins]

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Dear Dune,

I am still having problems with compiling my curvgrid.globalIdSet() method

When I look at YaspGrid, the method YaspGrid.globalIdSet() returns
Dune::IdSet<...>
but what is actually returned is
YaspGlobalIdSet<const YaspGrid> : public Dune::IdSet<...>

and that seems to work. Now, when I try to do something similar, I get
the error

error: invalid initialization of reference of type ‘const GlobalIdSet&
{aka const Dune::IdSet<const Dune::CurvilinearGrid<3, 3, double>,
Dune::CurvGrid::CurvIdSet<Dune::CurvilinearGrid<3, 3, double> >,
Dune::CurvilinearGridStorage<double, 3>::IdType>&}’ from expression of
type ‘const IdSetImpl {aka const Dune::CurvGrid::CurvIdSet<const
Dune::CurvilinearGrid<3, 3, double> >}’

const GlobalIdSet &globalIdSet () const  { return globalIdSet_; }


Any hints will be appreciated.

Cheers,
Aleksejs
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