darrenvhart wrote:

--- In Boost-Users@yahoogroups.com, "Peter Dimov" wrote:

...

You can use apply<> from instead of 'call':

bind(apply<bool>(), bind(&widget::sig, &widget_a)) (); // should call widget_a->sig

Thank you for the reply.

I have changed the line to use apply<bool>() and included the header file, but it won't compile complaining about noncopyable members of the signal of the widget. Any ideas what that is all about ?

Please change every 'F f' to 'F & f' in boost/bind/apply.hpp; this will take care of the problem. I've already updated the CVS version. The problem is that a signal is noncopyable and cannot be passed by value.