Syntax

macro( { expression { , expression }... } )

Notes

macro	the name of the macro to use, [ A..Z | a..z | _ ]{ A..Z | a..z | _ | 0..9 }...
expression	an expression to evaluate.

iPP predefines the following macros for use with the #if directive:

defined( )	returns whether the specified identifier or macro exists.
exist( )	returns whether the specified file exists.

New macros can be defined using the #define directive.

Example

#if !(defined(OS) || defined(VERSION))
    #error release not setup properly
#endif