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Re: Object programming with data... [message #30912 is a reply to message #30856]

Wed, 22 May 2002 08:39

Jaco van Gorkom
Messages: 97
Registered: November 2000

Member

"Randall Skelton" <rhskelto@atm.ox.ac.uk> wrote in message
news:Pine.LNX.4.33.0205192219030.712-100000@moriarty.atm.ox. ac.uk...
> In response to some of my own questions I found a post from Ken Knighton
> in 1996 that demonstrates one way of emulating operator overloading using
> IDL functions... I'm open to other suggestions.

I have used CASE statements in the past, but also occasionally made use of
recursion, something like:

function Add, p1, p2, p3, p4, p5, p6
if n_elements(p3) eq 0 then $
return, p1+p2 $
else $
return, Add(p1+p2, p3, p4, p5, p6)
end

There is a variant which can be very quick (and sort of ugly) to add to the
start of an existing function:

function Add, p1, p2, p3, p4, p5, p6
; Add this statement for recursive parameter handling
if n_elements(p3) ne 0 then $
return, Add( Add(p1,p2), p3, p4, p5, p6)
; Original two-parameter function code follows:
return, p1+p2
end

Cheers,
Jaco

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[Message index]

		Re: Object programming with data... By: David Fanning on Sun, 19 May 2002 15:28
		Re: Object programming with data... By: David Fanning on Sun, 19 May 2002 15:20
		Re: Object programming with data... By: Randall Skelton on Sun, 19 May 2002 14:22
		Re: Object programming with data... By: Craig Markwardt on Sun, 19 May 2002 14:12
		Re: Object programming with data... By: Randall Skelton on Sun, 19 May 2002 13:12
		Re: Object programming with data... By: David Fanning on Sat, 18 May 2002 07:39
		Re: Object programming with data... By: merlecorp on Wed, 22 May 2002 14:52
		Re: Object programming with data... By: Jaco van Gorkom on Wed, 22 May 2002 08:39
		Re: Object programming with data... By: Pavel A. Romashkin on Thu, 23 May 2002 08:28

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