Enumerated type creation
[1/3] from: princepawn:lycos at: 5-Sep-2000 7:39
I want to constrain the input values for a string field to be either the words "cancel"
or "nocancel".
REBOL has excellent support for forcing a function argument to be date!, time!, string!,
but I want to increase the restrictions for a particular field and have it throw an error
on spurious input.
Must I homebrew something or did I overlook the built-in support for this?
---
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[2/3] from: rebol:keithdevens at: 5-Sep-2000 10:57
This sounds like a job for Design by Contract. :)
As far as I know the only thing you can do in rebol is check for those
inputs and throw an error if the argument doesn't match one of them.
Keith
P.S. I wonder if Carl's ever looked at Eiffel and such for ideas for Rebol.
I know he's dealt with a lot of languages, but I'm interested to find out if
he's ever had any dealings with Eiffel and Design by Contract stuff...
Sather has it also, although I haven't looked at it too much at all.
----- Original Message -----
From: <[princepawn--lycos--com]>
To: <[list--rebol--com]>
Cc: <[feedback--rebol--com]>
Sent: Tuesday, September 05, 2000 10:39 AM
Subject: [REBOL] Enumerated type creation
> I want to constrain the input values for a string field to be either the
words "cancel" or "nocancel".
> REBOL has excellent support for forcing a function argument to be date!,
time!, string!, but I want to increase the restrictions for a particular
field and have it throw an error on spurious input.
[3/3] from: al:bri:xtra at: 6-Sep-2000 17:00
> I want to constrain the input values for a string field to be either the
words "cancel" or "nocancel".
> REBOL has excellent support for forcing a function argument to be date!,
time!, string!, but I want to increase the restrictions for a particular
field and have it throw an error on spurious input.
> Must I homebrew something or did I overlook the built-in support for this?
Change your design. Use two Radio buttons in Rebol/View.
Andrew Martin
ICQ: 26227169
http://members.xoom.com/AndrewMartin/