/usr/include/boost/pending/lowest_bit.hpp is in libboost1.46-dev 1.46.1-7ubuntu3.
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 27 28 29 30 31 32 33 34 35 36 37 38 39 | // -----------------------------------------------------------
// lowest_bit.hpp
//
// Position of the lowest bit 'on'
//
// Copyright (c) 2003-2004, 2008 Gennaro Prota
//
// 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 BOOST_LOWEST_BIT_HPP_GP_20030301
#define BOOST_LOWEST_BIT_HPP_GP_20030301
#include <assert.h>
#include "boost/pending/integer_log2.hpp"
namespace boost {
template <typename T>
int lowest_bit(T x) {
assert(x >= 1); // PRE
// clear all bits on except the rightmost one,
// then calculate the logarithm base 2
//
return boost::integer_log2<T>( x - ( x & (x-1) ) );
}
}
#endif // include guard
|