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Re: Pass by value and performance [message #46703 is a reply to message #46700]

Wed, 14 December 2005 09:28

Kenneth P. Bowman
Messages: 585
Registered: May 2000

Senior Member

Perhaps someone can clarify this for me.

I was doing this

data = {values : FLTARR(...), $
other : other stuff ...}

Then pass "data" to a procedure and do this

result = INTERPOLATE(data.values, x, y, z)

In this case data.values is passed by reference. (p. 92 of Building IDL
Applications)

If I were to use pointers, I could do something like this instead

data = {values : PTR_NEW(FLTARR(...)), $
other : other stuff ...}

Pass "data" to a procedure and do this

result = INTERPOLATE(*data.values, x, y, z)

Is *data.values passed by reference or by value? And how does one tell?

Ken

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[Message index]

		Re: Pass by value and performance By: JD Smith on Wed, 14 December 2005 11:04
		Re: Pass by value and performance By: David Fanning on Wed, 14 December 2005 09:54
		Re: Pass by value and performance By: Kenneth P. Bowman on Wed, 14 December 2005 09:28
		Re: Pass by value and performance By: David Fanning on Wed, 14 December 2005 09:08
		Re: Pass by value and performance By: Paul Van Delst[1] on Wed, 14 December 2005 09:02
		Re: Pass by value and performance By: David Fanning on Wed, 14 December 2005 07:53
		Re: Pass by value and performance By: Kenneth P. Bowman on Wed, 14 December 2005 07:09
		Re: Pass by value and performance By: peter.albert@gmx.de on Tue, 13 December 2005 23:38
		Re: Pass by value and performance By: Antonio Santiago on Wed, 14 December 2005 22:56

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