compile with visual studio

[ghiboz]

hi all!
i'm trying to compile vdrift with visual studio....
a strange error appears here:

the error is here:

Code:

    template <typename T> void _get(const PTree & p, T & value) const
    {
        std::stringstream s(p._value);
        s >> value;
    }

especially in the s >> value; when (seems looking the error) when I try to get a btVector3..

the error is this:

Error 1 error C2678: binary '>>' : no operator found which takes a left-hand operand of type 'std:tringstream' (or there is no acceptable conversion) cfg\ptree.h 230

thanks in advance for all!