| Re: Storing !NULL in struct [message #83609 is a reply to message #83531] |
Mon, 18 March 2013 02:00   |
tom.grydeland
Messages: 51
Registered: September 2012
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On Friday, March 15, 2013 8:40:56 PM UTC, Chris Torrence wrote:
> Hi all,
> Not to stir the pot some more [...]
Not at all, it is good to hear the rationale behind decisions such as this one.
> The deal-killer was that IDL structures are supposed to map directly to C structures. [...]
I'll buy that.
> As Mike suggests, perhaps HASH is the way to go.
Either of HASH or LIST would be perfectly fine, if I were able to even assign to already-known fields of structs stored inside them:
IDL> h = hash('f', {t:0})
IDL> help, h
H HASH <ID=198 NELEMENTS=1>
IDL> print, h['f'].t
0
IDL> h['f'].t = 1
% Attempt to store into an expression: Structure reference.
% Execution halted at: $MAIN$
IDL> c = list({t:0})
IDL> print, c[0].t
0
IDL> c[0].t = 1
% Attempt to store into an expression: Structure reference.
% Execution halted at: $MAIN$
It's not that I cannot imagine a way of working around this, but it seems to defeat the purpose of providing high-level data structures.
> Chris
--T
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