/usr/include/boost/tr1/tr1/bitset is in libboost1.54-dev 1.54.0-4ubuntu3.
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 23 24 25 26 | //  (C) Copyright John Maddock 2005.
//  Use, modification and distribution are subject to 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)
//
//  This file exists to prevent std lib headers from accidentally
//  including a TR1 extention header; we must suppress this otherwise
//  we can end up with cyclic dependencies with some std lib implementations.
//
#ifndef BOOST_TR1_bitset_INCLUDED
#  define BOOST_TR1_bitset_INCLUDED
#  ifndef BOOST_TR1_NO_RECURSION
#     define BOOST_TR1_NO_RECURSION
#     define BOOST_TR1_NO_bitset_RECURSION
#  endif
#  include <boost/tr1/detail/config_all.hpp>
#  if defined(BOOST_HAS_INCLUDE_NEXT) && !defined(BOOST_TR1_DISABLE_INCLUDE_NEXT)
#     include_next <bitset>
#  else
#     include BOOST_TR1_STD_HEADER(bitset)
#  endif
#  ifdef BOOST_TR1_NO_bitset_RECURSION
#     undef BOOST_TR1_NO_bitset_RECURSION
#     undef BOOST_TR1_NO_RECURSION
#  endif
#endif
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