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Re: determining if a structure has a given tag [message #66937 is a reply to message #66918]

Wed, 17 June 2009 05:09

R.Bauer
Messages: 1424
Registered: November 1998

Senior Member

Jeremy Bailin schrieb:
> I'm sure there is a simple answer to this, but I can't find it.
>
> Does someone know of a programmatic way to determine if a given tag is
> defined in a structure, without resorting to TAG_NAMES (which seems
> downright ugly). I can do something like
>
> if n_elements(variable) eq 0
>
> to determine if a variable has been defined, but to figure out if a
> structure tag is defined I need to grab a list of all tags?? I guess I
> want something that's functionally equivalent to:
>
> if total(tag_names(struct) eq strupcase(tag)) gt 0
>
> but which doesn't make me shudder. The closest discussion I can find
> on this is here:
> http://groups.google.com/group/comp.lang.idl-pvwave/browse_t hread/thread/2f2c38c0e9f0ee63/97dd066b2cc7af82?lnk=gst&q =structure+tag+defined#97dd066b2cc7af82
> ...but most of that focuses on the peculiarities of dealing with
> _EXTRA, not the more generic case.
>
> -Jeremy.

Result=is_tag(structure,tagname)

http://www.fz-juelich.de/icg/icg-1/idl_icglib/idl_source/idl _html/dbase/is_tag_dbase.pro.html

cheers
Reimar

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[Message index]

		Re: determining if a structure has a given tag By: Jeremy Bailin on Wed, 17 June 2009 17:12
		Re: determining if a structure has a given tag By: R.Bauer on Wed, 17 June 2009 05:09
		Re: determining if a structure has a given tag By: mankoff on Wed, 17 June 2009 03:00
		Re: determining if a structure has a given tag By: dosfun on Tue, 16 June 2009 22:51

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