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<Pm,I>'    BoostAsio    d:\downloads\boost_1_68_0\boost\bind\bind.hpp    2323        

namespace _bi
{

template<class Pm, class A1> struct dm_result
{
    typedef typename add_cref< Pm, 1 >::type type;    <<< 2323
};