| Resolving Built-ins and FORWARD_FUNCTION [message #37362] |
Mon, 08 December 2003 16:43 |
JD Smith
Messages: 850
Registered: December 1999
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Senior Member |
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Sent to RSI:
============================================================ ===============
Using FORWARD_FUNCTION creates an unresolved stub in the routine list,
even for built-in routines. E.g., in the NasaLib WRITEFITS you find :
FORWARD_FUNCTION FILE_SEARCH ;For pre-V5.5 compatibility
This causes problems for RESOLVE_ALL, which dutifully attempts to
compile the listed built-in:
IDL> .run 'writefits'
% Compiled module: WRITEFITS.
IDL> print,routine_info(/FUNCTIONS,/UNRESOLVED)
FILE_SEARCH HEADFITS SXPAR
IDL> resolve_all
% Compiled module: RESOLVE_ALL.
% Compiled module: CHECK_FITS.
% Compiled module: MKHDR.
% Compiled module: SXADDPAR.
% Compiled module: SXDELPAR.
% Attempt to call undefined procedure/function: 'FILE_SEARCH'.
% Error occurred at: RESOLVE_ALL_BODY 280
/usr/local/rsi/idl_6.0/lib/resolve_all.pro
% RESOLVE_ALL 332
/usr/local/rsi/idl_6.0/lib/resolve_all.pro
% $MAIN$
% Execution halted at: $MAIN$
IDL could either check for built-in's being used in FORWARD_FUNCTION, or
RESOLVE_ROUTINE could do the same, or FORWARD_FUNCTION functions could
be removed from the list once they are encountered in the file. Since
you can't override a built-in command (like FILE_SEARCH) with any amount
of !PATH fiddling, it makes sense not to put built-ins on the unresolved
list via FORWARD_FUNCTION.
============================================================ ===============
Also, does anyone know what a SAV file run in the IDLVM does with a
statement like:
source=routine_info('MyPro',/SOURCE)
I use these types of constructs to locate data bundled with my source
distribution, and I want it to work with the IDLVM too. Since the VM
technically doesn't do any compiling of files, I presume it might not
do any path searching for file source either, in which case I'd have
to come up with something different.
Thanks,
JD
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