After some fixes, mostly to contracts and documentation, I've pushed the new generics and set features to the master branch.
Carl Eastlund On Tue, Jul 23, 2013 at 11:37 AM, Carl Eastlund <c...@ccs.neu.edu> wrote: > My work on adding gen:set, and related changes to define-generics and > gen:dict, is ready for review and (hopefully) to push to the master > branch. The branch moved in the process of cleaning things up, it's now at: > > https://github.com/carl-eastlund/racket/tree/generics-from-scratch > > (The "from scratch" just refers to the process of rebuilding the git > history, I didn't go out of my way to rewrite anything in the code base > from scratch, although in some places a lot of code did move around.) > > What's new in the branch: > > - Generics now support a few new options > - #:fallbacks specifies fallback method implementations for instances > with no implementation > - #:fast-defaults specifies instances on a "fast path", useful for > built-in types > - #:defined-predicate gives a more intuitive and efficient interface > than #:defined-table > - #:derive-property allows generics to piggy-back on existing struct > properties > > - Sets are now a generic datatype through gen:set > - lists are now sets > - the built-in set types are now documented as "hash sets" > - there are mutable and weak hash sets > - you can define new set types quickly with define-custom-set-types > - most set operations are now methods with fallbacks > - sets now support -copy and -clear operations, plus mutating [!] > versions of operations > > - Dictionaries have a few changes > - new macro define-custom-hash-types [*] > - most dict operations are now methods with fallbacks > - dicts now support -copy, -clear, -clear!, and -empty? operations > > I've run some benchmarks and performance of the various generic operations > are comparable to the current HEAD, so there should be no major performance > changes with this patch. > > [*] I've added define-custom-hash-types and define-custom-set-types rather > than just adding make-custom-set akin to make-custom-hash because > make-custom-hash is hard to use. The documented behavior -- that any > custom hash is equal to any other created with the same bindings and > predicates / hash functions -- was never true and can be expensive or at > least tricky to implement. It seemed more sensible to just remove the > erroneous documentation on make-custom-hash, and add the definition form to > create constructors for new, explicitly-compatible dict and set types. > Both definition forms bind predicates and constructors for new (set or > dict) types with immutable, mutable, and weak variants that inter-operate. > > If there are no serious issues brought up in the next day or two, I'll > push it to the development branch, since our current release process isn't > following HEAD. > > Carl Eastlund >
_________________________ Racket Developers list: http://lists.racket-lang.org/dev
