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Re: How to add a new tag to N structures [message #70013 is a reply to message #70012]

Wed, 03 March 2010 10:44

penteado
Messages: 866
Registered: February 2018

Senior Member
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On Mar 3, 3:07 pm, wlandsman <wlands...@gmail.com> wrote:
> Well, I don't know how to avoid creating a new structure but you can
> use STRUCT_ASSIGN to copy fields from the old structure to the new
> one.
>
> IDL> str={a: 3l, b: 'v'}
> IDL> str_arr=REPLICATE(str,10)
>
> IDL> str1={a: 3l, b: 'w',c:0l}
> IDL> str1_arr= REplicate(str,10)
>
> IDL> struct_assign,temporary(str),str1
>
> where I changed the initialization values so one can verify that the
> "relaxed structure assignment" is working.

The only other way I see is to use a pointer array instead. Then you
can replace elements by whatever you want. But it is more likely to be
a worse solution, since it will not be possible to use fields as
arrays.

This reminds me of what I currently find most needed in create_struct:
an option to give it an array of field names, and an array of pointers
to the field contents. That way it would not be necessary to loop over
the fields, calling create_struct to add one field at a time, defining
a bunch of temporary structures that will never be used again. But
presumably this will not be necessary in IDL 8, since it will finally
have dictionaries.

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[Message index]

		Re: How to add a new tag to N structures By: natha on Thu, 04 March 2010 15:01
		Re: How to add a new tag to N structures By: R.Bauer on Thu, 04 March 2010 04:00
		Re: How to add a new tag to N structures By: David Fanning on Wed, 03 March 2010 11:44
		Re: How to add a new tag to N structures By: penteado on Wed, 03 March 2010 11:37
		Re: How to add a new tag to N structures By: David Fanning on Wed, 03 March 2010 11:02
		Re: How to add a new tag to N structures By: penteado on Wed, 03 March 2010 10:44
		Re: How to add a new tag to N structures By: wlandsman on Wed, 03 March 2010 10:07

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