storing the hash multiplier instead of the hash value

[Robert Jacques]

On Mon, 22 Mar 2010 19:00:57 -0300, Andrei Alexandrescu  
<SeeWebsiteForEmail at erdani.org> wrote:
[snip]
> And the last idea before I forget (just talked to Walter about it) is  
> that the GC could and should offer functions:
>
> GC.preCollect(void delegate());
> GC.postCollect(void delegate());
>
> That way we can effectively implement weak pointers.

Pre and post collect should be an array of delegates. Otherwise only one  
person's weak pointer library would work.