CyberSoft CVDL Tutorial

by Rick Perry
16 September 2001

17. VDL Macro Examples

$define pf1 $pets AND $food $define pets "dog" OR "cat" $define food "fish" OR "pie" $define pf2 ($pets) AND ($food) :v1, $pf1 AND "ate" # :v2, "ate" AND $pf2 # Note that pf1 resolves to: "dog" OR "cat" AND "fish" OR "pie" which is the same as: "dog" OR ("cat" AND "fish") OR "pie" but pf2 resolves to: ("dog" OR "cat") AND ("fish" OR "pie")

As with C/C++ #define macros, parentheses may be used in the VDL macro definition or invocation to ensure that the intended result is obtained.

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