Passing shared delegates

[Maxim Fomin]

On Wednesday, 16 January 2013 at 20:05:40 UTC, Martin Drasar 
wrote:
> Okay, I have hit another thing when dealing with shared 
> delegates.
>
> If I uncomment that line I get this error:
>
>> Error: function main.B.execute (void delegate(B b) shared c) 
>> is not callable using argument types (void delegate(B b) 
>> shared) shared
>
> This error probably appears because typeof b is B and typeof _b 
> is
> shared(B). My question is - why? Is it a bug or does the shared 
> delegate
> made it shared and it is ok? And what to do with it? I can cast 
> away
> shared of _b, but is it a correct and clean way?
>
> Thanks for your input.
>
> Martin

Yes, it happens so (shared function made it a member). Casting 
away shared is UB but it can be done if your are sure.
Consider rewriting the code and eliminating unnecessary shareds 
and please stop attaching "> " to each line of code.

To workaround add another method:

void callback(B b)
{
	_b.execute(&callback);
}