Hello, this is my first post to the Boost Users List. First, I want to present my respect to all the boost lib developers. I have been using boost lib for about two years and it has improved the quality and robustness of my code to points I would have never imagined. Thank you very much. I'm posting this message because I get the following warning in the bind.hpp header from the current trunk with the vc++2008 compiler: c:\code\BoostSVN\boost/bind.hpp(1643) : warning C4180: qualifier applied to function type has no meaning; ignored c:\code\BoostSVN\boost/bind.hpp(1677) : see reference to class template instantiation 'boost::_bi::add_cref' being compiled with [ Pm=sl::math::vector4<float> (__cdecl sl::pipe_smasher::pipes::build_float4::* )(void), I=1 ] c:\code\sl\pipe_smasher\pipes/build.hpp(106) : see reference to class template instantiation 'boost::_bi::dm_result' being compiled with [ Pm=sl::math::vector4f (__cdecl sl::pipe_smasher::pipes::build_float4::* )(void), A1=sl::pipe_smasher::pipes::build_float4 * ] My code looks like this: class build_float4 : public pipe { public: build_float4() { m_pOutput = add_output<vector4f>("Output"); m_pInputX = add_input<float>("x"); m_pInputY = add_input<float>("y"); m_pInputZ = add_input<float>("z"); m_pInputW = add_input<float>("w"); m_pOutput->add_dependency(boost::bind(&build_float4::on_input_change, this), m_pInputX, m_pInputY, m_pInputZ, m_pInputW); } vector4f on_input_change() { return vector4f(**m_pInputX, **m_pInputY, **m_pInputZ, **m_pInputW); } private: output<vector4f>* m_pOutput; input<float>* m_pInputX; input<float>* m_pInputY; input<float>* m_pInputZ; input<float>* m_pInputW; }; Checking the bind.hpp I found the following: template< class M, class T > struct add_cref< M T::*, 1 > { typedef M const & type; }; Maybe I'm doing something wrong or it is just a typo in the bind.hpp? Thank you, Isaac Lascasas