std.signal woes :/

[Damian]

On Saturday, 23 February 2013 at 23:39:19 UTC, cal wrote:
> On Saturday, 23 February 2013 at 17:01:48 UTC, Damian wrote:
>> Ok signals work fine, until I use them in a descendant class.
>>
>> Snippet:
>> -----------------
>> import std.signals;
>>
>> class ClassA
>> {
>> 	public mixin Signal!(int) addNumber1;
>> }
>>
>> class ClassB : ClassA
>> {
>> 	public mixin Signal!(int) addNumber2;
>> }
>>
>> Error:
>> \dmd2\src\phobos\std\signals.d(0,0): Error: function 
>> main.ClassB.Signal!(int).emit cannot override final function 
>> main.ClassA.Signal!(int).emit (moooo)
>>
>>
>> Is this expected behavior or a bug in my code?
>
> I think this is a known issue. Here is a workaround I've used:
>
>
> import std.signals;
>
> struct MySignal(T)
> {
>     mixin Signal!T _signal;
>     alias _signal this;
> }
>
> class ClassA
> {
>     MySignal!int addNumber1;
> }
>
> class ClassB : ClassA
> {
>     MySignal!int addNumber2;
> }
>
> void main()
> {
>     auto a = new ClassA;
>     auto b = new ClassB;
>     a.addNumber1.emit(1);
>     b.addNumber1.emit(1);
>     b.addNumber2.emit(1);
> }

That solution is ok for 1 argument but for many arguments it wont 
suffice.

This is issue 5028.