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Re: help with structure [message #70294 is a reply to message #70293]

Wed, 31 March 2010 14:49

penteado
Messages: 866
Registered: February 2018

Senior Member
Administrator

On Mar 31, 6:40 pm, David Fanning <n...@dfanning.com> wrote:
> Sumit writes:
>> I want to create a structure with 2 fields. The fields need to be of
>> variable length. I need to have 'n' such structures,where 'n' is
>> scalar number. To address the issue of variable length field, I create
>> pointers for each field( pointing to variable temp for initialization)
>> as shown below:
>> mystruct={l1:ptr_new(temp), l2:ptr_new(temp)}
>> I don't know how to create copies of this structure. Replicate
>> doesn't work as I guess it creates shallow copy.
>
> What do you mean it "doesn't work"?
>
> IDL> mystruct={l1:ptr_new(temp), l2:ptr_new(temp)}
> IDL> a= replicate(mystruct, 100)
> IDL> help, a
> A STRUCT = -> <Anonymous> Array[100]
> IDL> a[50].l2 = Ptr_New(findgen(11))

I suppose he means that by doing that, after the replicate(), all
elements of a point to the same two heap variables. There is no way
around it, he needs to loop on the elements to set the pointer on each
one to point to something new.

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[Message index]

		Re: help with structure By: penteado on Wed, 31 March 2010 18:50
		Re: help with structure By: David Fanning on Wed, 31 March 2010 16:13
		Re: help with structure By: penteado on Wed, 31 March 2010 15:47
		Re: help with structure By: David Fanning on Wed, 31 March 2010 15:42
		Re: help with structure By: David Fanning on Wed, 31 March 2010 15:37
		Re: help with structure By: Gray on Wed, 31 March 2010 15:12
		Re: help with structure By: penteado on Wed, 31 March 2010 14:49
		Re: help with structure By: David Fanning on Wed, 31 March 2010 14:40

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