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Re: Procedures with variable/dynamic argument list?? [message #73089 is a reply to message #73084]

Fri, 22 October 2010 06:56

Kenneth P. Bowman
Messages: 585
Registered: May 2000

Senior Member

In article
<d5d024b5-fb3e-438e-9277-c4dc032c35e2@n24g2000prj.googlegroups.com>,
SonicKenking <ywangd@gmail.com> wrote:

> Is it possible in IDL to code a procedure using variable/dynamic
> argument list?? i.e. the number of arguments is arbitrary and the
> procedure is able to accept them all with some argument array?
>
> Similar to the "va_list" in C or "*args" in Python.
>
> The Print command in IDL is a good example too for accepting arbitrary
> number of arguments and print them all. Unfortunately, the Print
> command is not written in IDL, hence no sneak peek of the source code
> ~~

IDL procedures and functions are flexible about how many
arguments you provide, as long as you don't pass too many.

You do have to provide at least as many dummy arguments
in the procedure definition as you intend to use. That is

PRO VAR_ARGS, a1, a2, a3, a4

can be called as

VAR_ARGS, x, y

It is up to the procedure to know what to do in that
case. (See the N_PARAMS function.)

As far as I know, there is no direct mechanism for
handling an arbitrary number of arguments other than
making a list in the procedure/function definition.

Ken

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[Message index]

		Re: Procedures with variable/dynamic argument list?? By: Michael Galloy on Mon, 25 October 2010 06:51
		Re: Procedures with variable/dynamic argument list?? By: SonicKenking on Mon, 25 October 2010 00:32
		Re: Procedures with variable/dynamic argument list?? By: pgrigis on Fri, 22 October 2010 08:50
		Re: Procedures with variable/dynamic argument list?? By: chris_torrence@NOSPAM on Fri, 22 October 2010 08:14
		Re: Procedures with variable/dynamic argument list?? By: pgrigis on Fri, 22 October 2010 07:26
		Re: Procedures with variable/dynamic argument list?? By: Kenneth P. Bowman on Fri, 22 October 2010 06:56
		Re: Procedures with variable/dynamic argument list?? By: SonicKenking on Fri, 22 October 2010 02:04
		Re: Procedures with variable/dynamic argument list?? By: Gray on Fri, 22 October 2010 01:57

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