dolfin team mailing list archive

["Garth N. Wells" <gnw20@xxxxxxxxx>]

Anders Logg wrote:
> On Tue, Feb 10, 2009 at 09:52:20AM +0000, Garth N. Wells wrote:
> > I know that we discussed const and mesh iterators a while ago, but can 
> > someone remind me why I can't do
> >
> >    void myfunction(const Cell& cell) const
> >    {
> >        for (VertexIterator vertex(cell); !vert.end(); ++vert)
> >        {
> > 	 . . . .
> >        }
> >    }
> >
> > but have to do
> >
> >    void myfunction(const Cell& cell) const
> >    {
> >        for (VertexIterator vertex(const_cast<Cell&>(cell)); !vert.end(); 
> >
> >             ++vert)
> >        {
> > 	 . . . .
> >        }
> >    }
> >
> > instead?
>
> You shouldn't have to. The class VertexIterator takes a const Cell
> argument:
>
>   VertexIterator(const MeshEntity& entity) : MeshEntityIterator(entity, 0) {}
>
> This is at the bottom of Vertex.h.
>
> Push it to sandbox/misc and I'll look at it.

Oops, I was compiling against an old version of DOLFIN in which the 
iterators are not const.

Garth


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