Re: [Boost-users] [signals] Painfully simple signals question

On Feb 6, 2005, at 10:13 AM, Tony Juricic wrote:

Shame be where it belongs, after rading documentation, implementation, examples and test code, I am unable to write what should be simple signals code:

--------------------------------------------- *.h

typedef boost::function Callback;

You should replace the Callback typedef with: typedef boost::signal::slot_type Callback; That'll make all of the object tracking stuff work properly.

boost::signal mySignal;

void Signal::Connect(Callback f) { // iterate over signal slots, if slot equals input f do nothing // otherwise connect f }

This operation is not possible with Signals: you can't get at the individual slots once they're connected. Essentially, Signals was designed with the idea that comparing function objects for equality when connecting/disconnecting is a bad idea, because it breaks down when the function objects you build are non-trivial (because it becomes hard to duplicate the function object when calling disconnect()). Doug