std.signals2 proposal

[eskimo]

On Tue, 2012-11-06 at 14:13 +0100, Jacob Carlborg wrote:
> > obj.signal.connect(() { /* my very funny delegate. */ })
> > which would compile with the standard implementation but would fail
> > badly at runtime.
> 
> And why would it be bad to pass a delegate literal like this?
> 
> 

Because the connect method in std.signal interprets the context pointer
of the delegate to be an Object. If it is not, your program crashes. To
quote the author of _d_toObject (which is used in the original
std.signal):


/******************************************
 * Given a pointer:
 *      If it is an Object, return that Object.
 *      If it is an interface, return the Object implementing the
interface.
 *      If it is null, return null.
 *      Else, undefined crash
 */
Object _d_toObject(void* p);

Also check out the bugs section in the html documentation:
http://dlang.org/phobos/std_signals.html