Hi All,
I was having fun with sequece-generate* and wrote this
program as an example of its use.
(let-values ([(first next) (sequence-generate* '(a b c))])
(let loop ([first first] [next next])
(when first
(display first) (newline)
(call-with-values next loop
The (let loo
On Oct 23, 2011, at 5:39 PM, Sam Tobin-Hochstadt wrote:
> Yes, I have planned to do this for a while. Probably the form it will
> take will be a macro that always produces a type error when checked,
> rather than a new type. Then macros could use this form to ensure
> exhaustiveness.
Great! Look
On Sun, Oct 23, 2011 at 11:03 AM, Eric Tanter wrote:
> So this seems the good way to go.
>
> However, of course, this does not work if the return type is compatible with
> Void:
>
> (: f ((U String Integer) -> Any))
> (define (f x)
> (cond
> [(string? x) (string=? x "hi")]
> [(exact-nonneg
On Oct 23, 2011, at 12:39 PM, Vincent St-Amour wrote:
> Using `Any' as a return type is something I only do as a quick and
> dirty solution. I assume that if you care enough to want case
> exhaustiveness checking, you probably care enough to nail down your
> return types precisely.
Ok for Any. But
It might be best to create your own subclass of panel% that expects to
have two children (a canvas% for drawing the background and an
editor-canvas% for the text% object) that centers the editor-canvas%
over the canvas%.
Robby
On Sun, Oct 23, 2011 at 10:17 AM, Erich Rast wrote:
> Hi,
>
> I've go
At Sun, 23 Oct 2011 12:03:23 -0300,
Eric Tanter wrote:
> However, of course, this does not work if the return type is compatible with
> Void:
>
> (: f ((U String Integer) -> Any))
> (define (f x)
> (cond
> [(string? x) (string=? x "hi")]
> [(exact-nonnegative-integer? x) (= x 7)]))
>
>
Hi,
I've got a bit of a strange requirement. What I need: a text% with
corresponding editor canvas centered on the screen filled with a
background color or image. Various tools and "overlays" might show up on
the background around the editor.
Method 1: Make a frame% fullscreen and put vertical a
So this seems the good way to go.
However, of course, this does not work if the return type is compatible with
Void:
(: f ((U String Integer) -> Any))
(define (f x)
(cond
[(string? x) (string=? x "hi")]
[(exact-nonnegative-integer? x) (= x 7)]))
typechecks.
I wonder if there a trick
Thanks Sam, that clears things up!
-- Éric
On Oct 22, 2011, at 6:25 PM, Sam Tobin-Hochstadt wrote:
> On Sat, Oct 22, 2011 at 2:20 PM, Eric Tanter wrote:
>> On Oct 21, 2011, at 1:55 PM, Sam Tobin-Hochstadt wrote:
>>> On Fri, Oct 21, 2011 at 12:44 PM, Eric Tanter wrote:
In that sense, un
As an aside, useful HTML templates don't have to be in HTML syntax;
Racket programmers can do this:
#lang racket/base
(require (planet neil/html-template:1:0))
(define (write-fastest-in-the-west-page-html thing)
(html-template
(html (head (title "Fastest " (% thing) " in the West!")
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