I'd like a combiner to return the slot iterator as a range. 1. What is the type of the iterator? (any exposed meta function to get this? I couldn't see in the docs) 2. Are the itertors valid after the combiner returns? 3. Is this already possible without a custom combiner? E.g. template<class T> struct MyRangeCombiner { typedef boost::iterator_range< some_meta<T>::type > result_type; template<class It> result_type operator()(It begin, It end) const { return boost::make_iterator_range(begin,end); } }; class ComboSlot { public: void method1(int i) {..} void method2(double d) {..} }; boost::signals2::signal< ComboSlot&() , MyRangeCombiner<ComboSlot> > sig; // in use for( ComboSlot& cs : sig() ) { cs.method1(3); cs.method2(3.14); } A broader picture is the following: More often than not I have a family of events (signals). The slots are connected in groups, such as the the ComboSlot above. One straightforward implementation is to maintain different signals for every method: ComboSlot cs; boost::signals2::signal< void(int) > sigMethod1; boost::signals2::signal< void(double) > sigMethod2; sigMethod1.connect( &ComboSlot::method1, _1 ); sigMethod2.connect( &ComboSlot::method2, _1 ); ... There is quite a bit of waste associated with above. Not only it requires more code, but also we know for sure that if method1 is connected, so will method2, and they will be connected to slots who calls the corresponding method on the same ComboSlot. One other alternative is to write a combiner which loops and calls the method within operator(). Returning a range would be a better alternative. Thanks Nick