This file is indexed.

/usr/include/polymake/hash_set is in libpolymake-dev-common 3.2r2-3.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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/* Copyright (c) 1997-2018
   Ewgenij Gawrilow, Michael Joswig (Technische Universitaet Berlin, Germany)
   http://www.polymake.org

   This program is free software; you can redistribute it and/or modify it
   under the terms of the GNU General Public License as published by the
   Free Software Foundation; either version 2, or (at your option) any
   later version: http://www.gnu.org/licenses/gpl.txt.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
--------------------------------------------------------------------------------
*/

#ifndef POLYMAKE_CORE_WRAPPERS_hash_set_
#define POLYMAKE_CORE_WRAPPERS_hash_set_

#include "polymake/next/hash_set"
#include "polymake/client.h"

namespace polymake { namespace perl_bindings {
///==== Automatically generated contents follow.    Please do not delete this line. ====
   template <typename T, typename T0>
   RecognizeType4perl("Polymake::common::HashSet", (T0), hash_set<T0>)

///==== Automatically generated contents end here.  Please do not delete this line. ====
} }

#endif // POLYMAKE_CORE_WRAPPERS_hash_set_

// Local Variables:
// mode:C++
// c-basic-offset:3
// indent-tabs-mode:nil
// End: