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Re: Pre-processor-like Capability? [message #6416 is a reply to message #6405]

Thu, 13 June 1996 00:00

dave
Messages: 31
Registered: February 1994

Member

>>>> > "Bruce" == Bruce E Thomason <brucet@hsonline.net> writes:

Bruce> Does anyone know of a IDL/PV-Wave capability that is
Bruce> analogous to C's preprocessor?

Bruce> I am particularly interested in efficiently establishing
Bruce> symbolic references (in the coding process) to constant
Bruce> values for use across many routines (as #define does w/ the
Bruce> C pre-processor), but to have these values efficiently
Bruce> accessed at run-time.

I create small functions at the beginning of the source that return the
desired values:

FUNCTION magic_number
return 'boing'
END

PRO whatever, x, y, z
. . .
IF a NE magic_number THEN BEGIN
print, "Bad Magic"
return, 0
ENDIF
. . .
END

This is portable, can be included in one source file, and used in
another, and is almost as simple as a #define. It's a good idea to
use a FORWARD_FUNCTION declaration to declare all such functions at
the beginning of a procedure, in case the definition is in another
file.

Performace won't suffer unless your code is highly looped, in which
case you chould probably be linking in a C for FORTRAN module anyway.

Good luck,

David.
--
David Fenyes University of Texas Medical School
dave@msrad72.med.uth.tmc.edu Dept. of Radiology

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[Message index]

		Re: Pre-processor-like Capability? By: dave on Sat, 15 June 1996 00:00
		Re: Pre-processor-like Capability? By: dave on Thu, 13 June 1996 00:00
		Re: Pre-processor-like Capability? By: thompson on Tue, 11 June 1996 00:00

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