Checking out Andy Friesen's example, http://andy.tadan.us/d/listener.d.
Mainly only did a bit renaming.

Features:

* Using the "struct in template" trick, signal templates with different number of template parameters can share the same name.

* Template mixins are used to paste generic functionality in each template defining signals for a different number of parameters.

* Signals can be connected to any member function or nested function, which then function as slots, by means of delegates.

* Connections are unmanaged. You can break a connection, but you have to know the exact signal and exact delegate.

* You can not find the object to which the "slot" belongs.



Compile:

	dmd -c test.d
	dmd -c signal.d
	dmd -Lsignal.o test.d

Run:
	./test