On Dec 15, 2004, at 12:47 PM, gast128 wrote:
Ok thank you. We use boost function also as a client defined callback. Because there is no operator==, it is very hard to unregister. So we came up with a solution probably comparable to the signals unregister solution.
Are you sure that the provided operator== doesn't work? The motivation for this formulation of operator== (other than the unimplementability of the general case) was that it solved Herb Sutter's "delegate" problem. For instance, you can write this: template<typename Signature> class delegate { typedef boost::function<Signature> callback_type; std::list<callback_type> callbacks; public: template<typename F> void register(const F& f) { callbacks.push_back(f); } template<typename F> void unregister(const F& f) { typename std::list<callback_type>::iterator pos = std::find(callbacks.begin(), callbacks.end(), f); if (pos != callbacks.end()) callbacks.erase(pos); } }; Doug