| Re: bug? or how to distinguish between a Hash and an array of Hashes ? [message #83390 is a reply to message #83389] |
Mon, 04 March 2013 08:28   |
wlandsman
Messages: 743
Registered: June 2000
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Senior Member |
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The documentation for TYPENAME() explains that it is not exactly the same as SIZE(/TNAME)
"If Variable is a scalar object or a one-element object array, Result will be the object class name. If Variable is an object array with two or more elements, Result will be the IDL basic type name “OBJECT” [because each element of the object array could have a different class name]."
So with a scalar hash, TYPENAME() can return "HASH" but for an array it will return OBJREF (not "OBJECT" as the documentation wrongly says). --Wayne
On Monday, March 4, 2013 11:24:49 AM UTC-5, David Fanning wrote:
> David Fanning writes:
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>> wlandsman writes:
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>>> You could use the TYPENAME function to distinguish the two variables
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>>>
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>>> IDL> print,typename(a)
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>>> HASH
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>>> IDL> print,typename(c)
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>>> OBJREF
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>>>
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>>> although I'm not sure why SIZE(/TNAME) doesn't give the same results.
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>> Oh, dear! Really!?
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> I guess this is right, though, since there are no "type" codes for hash
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> or list. They are objects, I guess, not real data types.
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> Still, awfully confusing to explain to a new user not familiar with the
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> "IDL Way". ;-)
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> Cheers,
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> David
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> --
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> David Fanning, Ph.D.
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> Fanning Software Consulting, Inc.
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> Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
>
> Sepore ma de ni thue. ("Perhaps thou speakest truth.")
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