On Wed, Apr 05, 2017 at 01:33:58AM +0200, Elizabeth Mattijsen wrote:
> > On 4 Apr 2017, at 11:31, Trey Ethan Harris <treyhar...@gmail.com> wrote:
> > 
> > I'm thinking of a Hash-like collection where I can add objects using a 
> > index-less append operation, but then have random access to the elements 
> > based on a key provided by the object. (For instance, imagine a 
> > ProcessTable, where I create the collection telling it to index by the .pid 
> > method, add each process to %table in serial without mentioning pid, and 
> > then look up the one referring to the interpreter with %table{$*PID}.)
> This is basically the approach that object hashes take internally.  So, feels 
> to me you just need object hashes?
>    https://docs.perl6.org/type/Hash#index-entry-object_hash
> Objects are internally keyed to the result of the .WHICH method on that 
> object.  If you create a class, one will be provided for you automatically.  
> But there’s nothing preventing you from making your own .WHICH method, as 
> long as the result is consistent for a given object and the same for all 
> objects you think should be considered identical, you should be fine.

I didn't know this but in OO land one would use a functorfactory
to produce hash functions or transformation functions on objects (some sort
of apply gain.)


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