| keywords and passing values [message #54872] |
Mon, 16 July 2007 09:49 |
Ingo von Borstel
Messages: 54
Registered: September 2006
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Member |
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Hi there,
I probably have - again - an issue with parameters and calling by
reference and value. But I don't see where I miss something as the same
works in other places:
I have a set of routines (actually object routines) that take a
parameter "valid". What I do is along these lines (added line numbers
for reference):
1 myobj::setdata, var
2 valid = 1
3 objnum = self->getdata_index(var,valid=valid,_extra=extra)
4 IF NOT valid THEN PRINT, "creating new data!"
5 END
7 FUNCTION myobj::getdata_index, var, valid=valid, $ (some other keywords)
8 valid = 1
9 (check for several things and return the search result, if successful)
10 valid = 0
11 RETURN, -1
12 END
If I now call the print routine with a variable value that will fail,
print itself never gets reported that its subroutine, getdata_index
returned valid=0, though I checked in line 11 that valid=0
IDL> myobj->print, 'not existent'
IDL>
Funnily, if I trace the programme and stop in line 4, call
IDL> valid = 1 & print, getdata_index(var,valid=valid) & print, valid
-1 0
IDL>
I get the results I want (valid=0).
I'm a bit puzzled right now and don't see where something is missing.
Best regards & thanks for any advice,
Ingo
--
Ingo von Borstel <newsgroups@planetmaker.de>
Public Key: http://www.planetmaker.de/ingo.asc
If you need an urgent reply, replace newsgroups by vgap.
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