/usr/include/dune/grid/common/topologyfactory.hh is in libdune-grid-dev 2.2.1-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | #warning #include <dune/grid/common/topologyfactory.hh> is deprecated.
#warning Use #include <dune/geometry/topologyfactory.hh> instead. You
#warning may need the new Dune-Geometry core module.
#include <dune/geometry/topologyfactory.hh>
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