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IsA questions [message #90551]

Mon, 09 March 2015 17:03

Matthew Argall
Messages: 286
Registered: October 2011

Senior Member

Why are an invalid objects and pointers not scalars?

IDL> print, size(1)
0 2 1
IDL> print, size(ptr_new())
0 10 1
IDL> print, size(obj_new())
0 11 1
IDL> print, isa(1, /SCALAR)
1
IDL> print, isa(ptr_new(), /SCALAR)
0
IDL> print, isa(obj_new(), /SCALAR)
0

How is the /STRING keyword different from setting Typename to "String"?

IsA('theString', 'String')
IsA('theString', /STRING)

Finally, is this confusing to anyone else? Why not a /DECIMAL keyword instead?

a = 1.0d
PRINT, ISA(a, /FLOAT) ; 1
PRINT, ISA(a, 'Float') ; 0

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[Message index]

		IsA questions By: Matthew Argall on Mon, 09 March 2015 17:03
		Re: IsA questions By: Matthew Argall on Mon, 09 March 2015 17:42
		Re: IsA questions By: chris_torrence@NOSPAM on Tue, 17 March 2015 09:59
		Re: IsA questions By: Matthew Argall on Tue, 17 March 2015 12:16
		Re: IsA questions By: chris_torrence@NOSPAM on Tue, 17 March 2015 15:22

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