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Re: Is this a bug? [message #13049 is a reply to message #12978]

Fri, 02 October 1998 00:00

J.D. Smith
Messages: 214
Registered: August 1996

Senior Member

Stein Vidar Hagfors Haugan wrote:
> Whenever you put brackets around anything *but* a simple variable,
> IDL makes a temporary variable (a "right hand value" - rvalue) out
> of it, and *then* decides how to do stuff outside the
> brackets. This is *why* putting brackets around e.g., function
> calls will allow you to do this: print,(size(a))[0].
>

As a side note, it is this same behavior which allows you to perform
another useful trick, often overlooked:

b=(a=val)

This will assign val to b and a in one shot. Furthermore,

d=(c=(b=(a=val)))

will work just as well.

See, rvalues aren't all bad.

JD

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J.D. Smith |*| WORK: (607) 255-5842
Cornell University Dept. of Astronomy |*| (607) 255-6263
304 Space Sciences Bldg. |*| FAX: (607) 255-5875
Ithaca, NY 14853 |*|

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[Message index]

		Is this a bug? By: David Foster on Wed, 30 September 1998 00:00
		Re: Is this a bug? By: J.D. Smith on Fri, 02 October 1998 00:00
		Re: Is this a bug? By: J.D. Smith on Fri, 02 October 1998 00:00
		Re: Is this a bug? By: menakkis on Fri, 02 October 1998 00:00
		Re: Is this a bug? By: steinhh on Thu, 01 October 1998 00:00
		Re: Is this a bug? By: rmlongfield on Thu, 01 October 1998 00:00
		Re: Is this a bug? By: menakkis on Thu, 01 October 1998 00:00

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