Hi, i'm stucked and google does not lead me to the right pages :-( The follwing code example does not compile on gcc 4.1.1 an boost 1.33.1 . It works on msvc.net 7.1. ---code starts here #include #include #include <iostream> struct Printer { void operator()(int iValue) { std::cout << iValue << "\n"; } }; int main(int /* argc */, char* /* argv[] */) { typedef boost::signal tSignal; tSignal stSignal; Printer stPrinter; stSignal.connect(stPrinter); typedef std::vector<int> tConInts; tConInts cInts; cInts.push_back(1); cInts.push_back(2); cInts.push_back(3); for_each(cInts.begin(), cInts.end(), boost::bind(&tSignal::operator(), boost::ref(stSignal), _1)); return 0; } ---code ends here ---gcc output starts here main.cpp: In function 'int main(int, char*)': main.cpp:37: error: call of overloaded 'bind(<unresolved overloaded function type>, const boost::reference_wrapper > >, boost::arg<1>&)' is ambiguous /usr/local/gcc-4.1.1/boost-1.33.1/boost/bind/bind_mf_cc.hpp:43: note: candidates are: boost::_bi::bind_t, typename boost::_bi::list_av_2::type> boost::bind(R (T::*)(B1), A1, A2) [with R = boost::last_value<void>::unusable, T = boost::signal1 >, B1 = int, A1 = boost::reference_wrapper > >, A2 = boost::arg<1>] /usr/local/gcc-4.1.1/boost-1.33.1/boost/bind/bind_mf_cc.hpp:54: note: boost::_bi::bind_t, typename boost::_bi::list_av_2::type> boost::bind(R (T::*)(B1)const, A1, A2) [with R = boost::last_value<void>::unusable, T = boost::signal1 >, B1 = int, A1 = boost::reference_wrapper > >, A2 = boost::arg<1>] make: *** [main.o] Error 1 ---gcc output ends here I think something with static_cast is the solultion, but i don't know how? Any hints? Thanks in advance, Lars