I found a very good explanation here:
http://blog.think-async.com/2010/04/bind-illustrated.html
On Tue, Dec 20, 2011 at 12:07 AM, Igor R
It is specified in http://www.boost.org/doc/libs/1_47_0/doc/html/boost_asio/reference/AcceptHan... that a handler for `async_accept()` must satisfy the following function signature:
void accept_handler( const boost::system::error_code& ec) { ... }
However, in the `Daytime.3` example, using boost::bind, the handler can be specified as much parameter as desired, as long as it does not exceed the limit of `boost::bind` (which is 9 arguments at maximum): <...> Why is that possible? I thought even with `boost::bind`, the exact function signature still has to be matched.
It is possible, because bind creates a functor that exposes operator() having the number of arguments that matches the expectations of the completion handler caller. _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users