/usr/include/odb/details/unused.hxx is in libodb-dev 2.4.0-1+b1.
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 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | // file : odb/details/unused.hxx
// copyright : Copyright (c) 2009-2015 Code Synthesis Tools CC
// license : GNU GPL v2; see accompanying LICENSE file
#ifndef ODB_UNUSED_DETAILS_HXX
#define ODB_UNUSED_DETAILS_HXX
#include <odb/pre.hxx>
// VC++ doesn't like the (void)x expression if x is a reference to
// an incomplete type. On the other hand, GCC warns that (void*)&x
// doesn't have any effect.
//
#ifdef _MSC_VER
# define ODB_POTENTIALLY_UNUSED(x) (void*)&x
#else
# define ODB_POTENTIALLY_UNUSED(x) (void)x
#endif
#include <odb/post.hxx>
#endif // ODB_UNUSED_DETAILS_HXX
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