/usr/include/dune/common/unused.hh is in libdune-common-dev 2.4.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// vi: set et ts=4 sw=2 sts=2:
#ifndef DUNE_COMMON_UNUSED_HH
#define DUNE_COMMON_UNUSED_HH
/** \file
* \brief Definition of the DUNE_UNUSED macro for the case that config.h
* is not available
*/
#ifndef HAS_ATTRIBUTE_UNUSED
#define DUNE_UNUSED
#else
#define DUNE_UNUSED __attribute__((unused))
#endif
/// A macro to mark intentional unused function parameters with.
#define DUNE_UNUSED_PARAMETER(parm) static_cast<void>(parm)
#endif
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