| Re: Storing !NULL in struct [message #83608 is a reply to message #83531] |
Mon, 18 March 2013 02:27   |
lecacheux.alain
Messages: 325
Registered: January 2008
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Senior Member |
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Le lundi 18 mars 2013 10:00:58 UTC+1, Tom Grydeland a écrit :
> On Friday, March 15, 2013 8:40:56 PM UTC, Chris Torrence wrote:
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>> Hi all,
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>> Not to stir the pot some more [...]
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> Not at all, it is good to hear the rationale behind decisions such as this one.
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>> The deal-killer was that IDL structures are supposed to map directly to C structures. [...]
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> I'll buy that.
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>> As Mike suggests, perhaps HASH is the way to go.
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> 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:
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> IDL> h = hash('f', {t:0})
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> IDL> help, h
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> H HASH <ID=198 NELEMENTS=1>
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> IDL> print, h['f'].t
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> 0
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> IDL> h['f'].t = 1
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> % Attempt to store into an expression: Structure reference.
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> % Execution halted at: $MAIN$
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> IDL> c = list({t:0})
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> IDL> print, c[0].t
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> 0
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> IDL> c[0].t = 1
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> % Attempt to store into an expression: Structure reference.
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> % Execution halted at: $MAIN$
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> 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.
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>> Chris
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> --T
IDL> h = hash('f', {t:0})
IDL> help, h
H HASH <ID=1 NELEMENTS=1>
IDL> print, h['f'].t
0
IDL> h['f'] = {t:1}
IDL> print, h['f'].t
1
alx.
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