I think you can create a custom accessor, and use macros to avoid the Royal
Pain.
One question is, is the derived field expensive to compute? If not, your
custom accessor can just compute the output every time it’s called. But if
it’s expensive, you can use memoization. Both approaches have the be
Is there a way to define a struct so that it has a field whose value is
filled in (instead of passed to the constructor) with a value derived from
other fields? For example, could you define a struct foo with two explicit
fields, x and y, plus a field called z whose value is computed as (+ x y)
(current-library-collection-paths)
'(#
# #)
I suspect the above is incorrect because I think the 8.1 path should be to
dir: /pkgs rather than /collects. Like this:
#
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Now that I have learned of: config.rktd,
I think I'd rather use it, if it can be used to set
current-library-collection paths.
Should I just add to the config.rktd hash list:
(current-library-collection paths .
'(#
# #))
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To answer Mathew Flatt's question: "Do you expect 3" (paths) "because you
have an
environment variable set, or something like that? "
Answer: Yes. I can run a shell file that contains:
#! /bin/bash
export PLTCOLLECTS="/home/don/.plt-scheme/4.2.1/collects:"
Many of my programs are accessible from
Thanks for the answers!
On Thursday, 3 June 2021 at 17:26:57 UTC-4 shhyou wrote:
> In addition to the constructor, `foo` is also used for compile-time
> struct information. To avoid this, either supply #:name to designate a
> different identifier for compile-time struct type information, or
> dec
At Thu, 3 Jun 2021 20:26:59 -0700 (PDT), Don Green wrote:
> Using DrRacket in linux:
> When I run DrRacket from a terminal,
>
> (current-library-collection-paths) returns the expected paths, 3 of them.
>
> However, when I open one of my .ss files which is associated with drracket,
>
> the file o
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