IFDEF

Purpose

Compiler directives to allow inclusion or exclusion of source code based on a compile-time constant

Syntax

#IFDEF <constant>

[<statements1>]

[#ELSE]

[<statements2>]

#ENDIF

See Also

COMPILE, DEFINE, DO, DO CASE, IF, SET COMPILE, SET DEVELOPMENT

Description

The #IFDEF compiler directive can be used to allow inclusion or exclusion of source code based on the existence of a compile-time constant. The constant, <constant>, is defined using the #DEFINE directive. At compile time, the compiler checks if the <constant> is defined. If it is defined, the <statements1> that follow are included in the compiled program file. If the <constant> is not defined, the <statements1> are excluded. If the <constant> is not defined and there is a #ELSE directive specified, the <statements2> following the #ELSE directive are included in the compiled program file.

This directive can only be used in compiled programs.