Hello, I'm working on a little project which use the template variadic technology. I use them with boost::bind and boost::function and found a very annoying bug. Because I have a lot of files very long and (sorry :-( ) uncommented. I made a simple but explicit example like this one : ---------------------------------------------- #include #include #include <iostream> // A classic class... class A { public: // ... with a constructor A(int a) : a(a) { } // ... an operator void operator()() { std::cout << (void*)this << "::" << __func__ << "(): " << a << std::endl; } // ... and a member int a; }; // A stupid function... void call_a(A &a) { // ... which do something usefull // please not that this function NEEDs a reference a(); } // A template variadic function... template boost::function0<void> call_something(classes... c) { // ... here we are: return boost::bind(call_a,boost::ref(c...)); } // Ok, this one, I think you know it more than I do int main(void) { // Let's create some objets A a1(1); A a2(2); // Call them to print the memory // position (see A::operator()()) a1(); a2(); // Create a boost::function0<void> and call it call_something<A>(boost::ref(a1))(); // Again call_something<A>(boost::ref(a2))(); return 0; } ---------------------------------------------- After compilation, I get this output (watch the memory addresses): 0xbfc8f994::operator()(): 1 0xbfc8f990::operator()(): 2 0xbfc8f984::operator()(): 1 0xbfc8f984::operator()(): 2 I really don't know what happened (even if I can imagine). But references are just lost and this is not good. So, here is my question: How can I make this working ? May I precise that this example only use one argument but my project actually use at most five so the boost::ref() call like in the call_something function is impossible (and does not work anyway). Before someone ask me if I can use pointer instead, I answer: Yes I can, but it will take a lot of time and if I can avoid this, I will. Thank you for reading, for your patience and for your answers ;-) Regards, Yannick POTIN