#ifndef

A #ifndef command (like #if and #ifdef) can be used to conditionally include lines of text, this can be any other type of line or command except #elseif or #endif.

#if commands can be nested to any level and there need not be any lines between a #if command and a #endif or #elseif command.

Note that this command only checks on a single variable, for more complex requirements you will need to use a #if command along with calls to the Defined() routine. For performance reasons it is recommended that you use #ifdef and #ifndef commands where possible.

Syntax

[WhiteSpace]#ifndef  MacroName

The "MacroName" specifies the name of a macro that should NOT exist for the test to evaluate to true.

Example

#define Fred FredsValue
#ifndef Fred
    ...
#endif

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PPWIZARD Manual

Saturday May 28 2022 at 2:55pm