This file is indexed.

/usr/include/geos/indexChain.h is in libgeos++-dev 3.4.2-4ubuntu1.

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

The actual contents of the file can be viewed below.

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/**********************************************************************
 *
 * GEOS - Geometry Engine Open Source
 * http://geos.osgeo.org
 *
 * Copyright (C) 2001-2002 Vivid Solutions Inc.
 *
 * This is free software; you can redistribute and/or modify it under
 * the terms of the GNU Lesser General Public Licence as published
 * by the Free Software Foundation. 
 * See the COPYING file for more information.
 *
 **********************************************************************/

#ifndef GEOS_INDEXCHAIN_H
#define GEOS_INDEXCHAIN_H

namespace geos {
namespace index { // geos.index

/// Contains classes that implement Monotone Chains
namespace chain { // geos.index.chain

} // namespace geos.index.chain
} // namespace geos.index
} // namespace geos

#include <geos/index/chain/MonotoneChain.h>
//#include <geos/index/chain/MonotoneChainBuilder.h>
#include <geos/index/chain/MonotoneChainOverlapAction.h>
#include <geos/index/chain/MonotoneChainSelectAction.h>

#endif