Seems I can't "unforget" erroneously forgotten files, so will have to forget them and then re-add them
// Boost.Range library
//
// Copyright Thorsten Ottosen 2003-2006. Use, modification and
// distribution is 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)
//
// For more information, see http://www.boost.org/libs/range/
//
#ifndef BOOST_RANGE_DISTANCE_HPP
#define BOOST_RANGE_DISTANCE_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif
#include <boost/range/begin.hpp>
#include <boost/range/end.hpp>
#include <boost/range/difference_type.hpp>
namespace boost
{
template< class T >
inline BOOST_DEDUCED_TYPENAME range_difference<T>::type
distance( const T& r )
{
return std::distance( boost::begin( r ), boost::end( r ) );
}
} // namespace 'boost'
#endif