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Re: Defining Integer Field in a Structure [message #27726 is a reply to message #27695]

Thu, 01 November 2001 15:36

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

JD Smith <jdsmith@astro.cornell.edu> writes:

> Brian Bell wrote:
>>
>> Is there a way to define a field within a structure whose type is
>> integer? In my case, I want the field to be any integer from 0 to 4.
>> I know you can assign an actual integer to the field, but I don't want
>> to do this because I want the field value to change within certain
>> procedures and to return that value to the procedures calling it. I
>> would appreciate any help you might be able to offer.
>>
>
> This is illegal:
>
> IDL> a={0:"this", 1:"is",2:"a",3:"funny",4:"test"}
>
> so the short answer is no. However, if you just want 4 numbered
> "slots", try an array:
>
> IDL> a={vals:['this','is','a','funny','test']}
> IDL> print,a.vals[1]
> is
>
> if you'd like the types of each slot to be different, try at a pointer
> array. If you'd like the number of "slots" to be variable, try a
> pointer to a pointer array.

Following up on this diversion, it was in fact possible in IDL 5.2 and
earlier to make structures whose tag names were not valid IDL variable
names. For example, this statement was perfectly valid and executable:

x = create_struct('1',"this",'2',"is",'3',"funny",'4',"test ")

and it made exactly the structure you were expecting. However, I'm
not sure it would be useful, and more importantly these types of
antics are now forbidden by the IDL runtime.

Craig

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Craig B. Markwardt, Ph.D. EMAIL: craigmnet@cow.physics.wisc.edu
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[Message index]

		Re: Defining Integer Field in a Structure By: Logan Lindquist on Fri, 02 November 2001 12:06
		Re: Defining Integer Field in a Structure By: Craig Markwardt on Thu, 01 November 2001 15:36
		Re: Defining Integer Field in a Structure By: David Fanning on Thu, 01 November 2001 14:58
		Re: Defining Integer Field in a Structure By: Pavel A. Romashkin on Thu, 01 November 2001 14:27
		Re: Defining Integer Field in a Structure By: David Fanning on Thu, 01 November 2001 14:05
		Re: Defining Integer Field in a Structure By: John-David T. Smith on Thu, 01 November 2001 13:24
		Re: Defining Integer Field in a Structure By: Harvey Rarback on Tue, 06 November 2001 17:02

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