/usr/include/stxxl/bits/unused.h is in libstxxl-dev 1.3.1-1.
This file is owned by root:root, with mode 0o644.
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* include/stxxl/bits/unused.h
*
* Part of the STXXL. See http://stxxl.sourceforge.net
*
* Copyright (C) 2007 Andreas Beckmann <beckmann@cs.uni-frankfurt.de>
* Copyright (C) 2009 Johannes Singler <singler@ira.uka.de>
*
* Distributed under the Boost Software License, Version 1.0.
* (See accompanying file LICENSE_1_0.txt or copy at
* http://www.boost.org/LICENSE_1_0.txt)
**************************************************************************/
#ifndef STXXL_UNUSED_HEADER
#define STXXL_UNUSED_HEADER
#include <stxxl/bits/namespace.h>
__STXXL_BEGIN_NAMESPACE
template <typename U>
inline void STXXL_UNUSED(const U &)
{ }
__STXXL_END_NAMESPACE
#endif // !STXXL_UNUSED_HEADER
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