#undef

Preprocessor directive to undefine a macro

Syntax
	#undef symbol

Description
	Undefines a symbol previously defined with KeyPgPpdefine#define.

	Can be used to ensure that a macro or symbol has a limited lifespan and 
	does not conflict with a similar macro definition that may be defined 
	later in the source code.

	(Note: #undef should not be used to undefine variable or function names 
	used in the current function scope.  The names are needed internally by 
	the compiler and removing them can cause strange and unexpected 
	results.)

Example
	#define ADD2(a_, b_)  ((a_) + (b_))
	Print ADD2(1, 2)
	' Macro no longer needed so get rid of it ...
	#undef ADD2

Differences from QB
	* New to Freebasic

See also
	* KeyPgPpdefine#define
	* KeyPgPpmacro#macro
	* KeyPgPpif#if
	* KeyPgPpelse#else 
	* KeyPgPpelseif#elseif 
	* KeyPgPpelseifdef#elseifdef 
	* KeyPgPpelseifndef#elseifndef 
	* KeyPgPpendif#endif 
	* KeyPgPpifdef#ifdef
	* KeyPgPpifndef#ifndef
	* KeyPgDefineddefined

