[Boost-users] undefined type on vs2008 but not vs2010

Hi, I'm new to C++, working on an old project using the vs2008 toolset. I need to add some networking and so I started with the docs tutorial "An asynchronous TCP daytime server". Boost 1.68 Error    C2027    use of undefined type 'boost::_bi::add_cref'    BoostAsio    d:\downloads\boost_1_68_0\boost\bind\bind.hpp    2323         namespace _bi {template< class Pm, int I > struct add_cref; ... template struct dm_result {     typedef typename add_cref< Pm, 1 >::type type;    <<< 2323 }; Do I need to provide more details? Thanks