GNU's GTK+ relies very heavily on signals and callbacks and I'm sure other libraries (especially GUI toolkits) could use this kind of communication, so wouldn't it be sensible to put it in the language? I've gone through the spec some and didn't see anything like that.

They don't need to be built into the language; it's really easy to wrap a set of delegates to achieve the same end result.

Joshua Booth wrote:
> GNU's GTK+ relies very heavily on signals and callbacks and I'm sure other libraries (especially GUI toolkits) could use this kind of communication, so wouldn't it be sensible to put it in the language? I've gone through the spec some and didn't see anything like that.
>