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Re: IDL8.4 hard crash [message #90303 is a reply to message #90302]

Wed, 18 February 2015 14:18

chris_torrence@NOSPAM is currently offline

chris_torrence@NOSPAM
Messages: 528
Registered: March 2007

Senior Member

On Wednesday, February 18, 2015 at 2:47:30 PM UTC-7, JDS wrote:
>>
>> The crash is fixed in IDL 8.4.1. Thanks for reporting it!
>> -Chris
>
> Thanks.
>
>> p.s. I can't quite wrap my head around how the auto-instantiation would work. More examples?
>
> If you are constructing some nested HASH structure, now you must say:
>
> a=hash()
> a['key']=hash()
> a['key','sub1']=hash()
> a['key','sub1','sub2']=hash()
> a['key','sub1','sub2','value']=1.0
>
> This might more typically occur inside a loop pulling keys and values from various locations. This is also by the way why I was using a=hash() & c=(a['b']=hash()) -- to make this sort of construction slightly less painful.
>
> Auto-instantiation means that any hash key which references an undefined value *on assignment* will cause that value to be initialized as a HASH object instead of just saying "key does not exist" and aborting. If that were in place, the above would simply be:
>
> a=hash()
> a['key','sub1','sub2','value']=1.0
>
> This comes up quite a bit when attempting to populate deeply nested HASH structures. You end up with code sprinkled with lots of useless tests like:
>
> if ~a[key1].hasKey(key2) then a[key1,key2]=hash()
>
> With auto-instantiation, these statements would be implicit. It also would make Perl programmers happy ;).
>
> Thanks again,
>
> JD

Okay, I like that. I was able to hack it in with 3 lines of code.

IDL> a = hash()
IDL> a['a1','b1','c1','d1','e1','f1','g1','h1'] = 5
IDL> a
{
"a1": {
"b1": {
"c1": {
"d1": {
"e1": {
"f1": {
"g1": {
"h1": 5
}
}
}
}
}
}
}
}

Hmmm. Not sure how I can get the code to you...

-Chris

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[Message index]

		IDL8.4 hard crash By: JDS on Wed, 18 February 2015 12:37
		Re: IDL8.4 hard crash By: bill.dman on Wed, 18 February 2015 12:55
		Re: IDL8.4 hard crash By: chris_torrence@NOSPAM on Wed, 18 February 2015 13:18
		Re: IDL8.4 hard crash By: JDS on Wed, 18 February 2015 13:47
		Re: IDL8.4 hard crash By: chris_torrence@NOSPAM on Wed, 18 February 2015 14:18
		Re: IDL8.4 hard crash By: Fabzi on Thu, 19 February 2015 00:22
		Re: IDL8.4 hard crash By: chris_torrence@NOSPAM on Thu, 19 February 2015 06:40
		Re: IDL8.4 hard crash By: Fabzi on Thu, 19 February 2015 07:19
		Hash auto-instantiation (was IDL8.4 hard crash) By: chris_torrence@NOSPAM on Thu, 19 February 2015 10:28
		Re: IDL8.4 hard crash By: Fabzi on Wed, 18 February 2015 14:21

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