[plt-dev] Release Announcement for v4.2.4

From: Robby Findler (robby at eecs.northwestern.edu)
Date: Thu Jan 28 15:38:23 EST 2010

scheme/class probably gets quotes (or drop all the others :).


On Thu, Jan 28, 2010 at 2:36 PM, Eli Barzilay <eli at barzilay.org> wrote:
> Unless someone objects soon, this is the final version.
> ----------------------------------------------------------------------
> * The `scheme/flonum' and `scheme/fixnum' libraries provide flonum-
>  and fixnum-specific operations.  In the case of flonum-specific
>  operations, the JIT compiler can recognize combinations of
>  operations (including local bindings) and improve performance by
>  "unboxing" intermediate results.
> * The `scheme/unsafe/ops' library provides arithmetic and other
>  operations that are implemented without dynamic checks.  Avoiding
>  checks can sometimes improve performance, but at the expense of
>  safety.
> * `2htdp/universe': We have severed the connection between universe
>  and an image library and made a few other, minor changes.  Most
>  programs will now have to change to require the `htdp/image'
>  library explicitly.  For the full details, see the new Porting
>  World Programs section of the documentation:
>    http://docs.plt-scheme.org/teachpack/2htdphtdp-port.html
> * The `2htdp/image' library continues to grow.  In this release, it
>  is supported by `2htdp/universe', equality changed to be based on
>  how the images are drawn, cropping and curves were added, and
>  support for more kinds of pens were added.
> * `htdp/world': The old world teachpack remains deprecated.  HtDP/2e
>  exclusively uses the new 2htdp/universe library.  For backwards
>  compatibility, the world teachpack will remain in the distribution
>  until the coming summer.
> * The scheme/class library now provides `this%', which refers to the
>  class of the current object (i.e. `this').
> * `scheme/generator' has convenient functions for infinite
>  generators, and for converting a generator to a sequence for
>  iteration.
> * PLT Scheme's add-on directory can be customized by the
>  $PLTADDONDIR environment variable or `--addon'/`-A' command-line
>  flags.  This controls where downloaded Planet packages and their
>  compiled Scribble documentation are installed.
> * Additional extensions include: saving `errno' in foreign calls,
>  much improved `sort' speed, normalized results from
>  `procedure-arity', and more.
> ----------------------------------------------------------------------
> --
>          ((lambda (x) (x x)) (lambda (x) (x x)))          Eli Barzilay:
>                    http://barzilay.org/                   Maze is Life!
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