[pdal] PointView::dims()

[Kramer, Oscar]

I see the following inline definition in PointView.hpp:

    Dimension::IdList dims() const   { return m_pointTable.layout()->dims(); }

While in PointLayout, the dims list is returned as a const reference:

   const Dimension::IdList&  dims() const;

Is that intentional? I modified PointView.hpp in my workspace to mirror the underlying call's return type (namely, const IdList&) and PDAL compiled OK.
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