[racket-dev] Optional equality predicate for assoc and member

From: Matthias Felleisen (matthias at ccs.neu.edu)
Date: Fri Apr 22 16:32:33 EDT 2011

This is way overdue. Thanks. 

[I have used memf and assf from unstable and something else for my project.]

On Apr 22, 2011, at 4:26 PM, Vincent St-Amour wrote:

> Currently, unlike remove and remove-duplicates, assoc and member
> cannot use a user-provided equality check. I have a patch that fixes
> that by adding an optional argument to these two functions.
> With this patch, assoc and member are implemented in Racket. They are
> currently implemented in C. I haven't measured the performance impact
> of the change, but I can do it if someone believes it's necessary.
> Is anyone opposed to this change?
> Vincent
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