Re: [Boost-users] bind/function: composition

Johan Torp wrote:

I often tend to have interfaces which take a boost::function<void()> that is to be called when an event occurs. Quite often I need make two separate function calls as response to one event. In these cases I usually solve the problem using the following technique:

void foo(); void bar();

void call_two(const boost::function<void ()>& one, const boost::function<void ()>& two) { one(); two(); }

boost::function<void ()> on_event = boost::bind(&call_two, boost::bind(&foo), boost::bind(&bar));

Why not just use Boost Signals to have a single signal just call your two different slots of foo and bar ? It seems you are unnecessarily trying to re-invent a wheel which has already been re-invented by the signals library.