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Wrong about keyword param as output var. [message #4262]

Thu, 18 May 1995 00:00

Russ Welti
Messages: 27
Registered: October 1994

Junior Member

Before any sharp-eyed persons correct me for my misstatement
about setting output variables which were passed as keyword
parameters, I thought I would correct myself.

I noticed that simply setting a keyword parameter to a new
value accomplishes the setting of the corresponding passed
in variable's value for the calling routine, regardless of
whether it was defined when the setting routine was called.

So, in:

pro whelp, txt, title=title, lines=lines, exit_text=texit, $
wid=b0, group_leader=grp, help=hlp ; by R.Sterner

the keyword param 'b0' is given a window id in the routine and
is returned to me, where I had not already defined my receiving
variable.

I think it was due to my habit of making local copies:

if n_elements(b0) GT 0 then $
local_b0 = b0 $
else $
local_b0 = <local_default_b0>

that I missed this.
/
Russ Welti /-\
rwelti@u.washington.edu \-/

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Wrong about keyword param as output var.

By: Russ Welti on Thu, 18 May 1995 00:00

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