__FB_ARG_EXTRACT__

Intrinsic define (macro) performed by the compiler.

Syntax
	__FB_ARG_EXTRACT__( index, args... )

Parameters
	index
		zero-based offset from the first argument (zero or positive integer 
		value)
	args...
		argument list

Description
	Returns the argument from the argument list (args...) corresponding to 
	the index value (index).

	If the requested index value refers to an argument that does not exist 
	in the supplied argument list (index value too large), nothing is 
	returned.

Example
	#print __FB_ARG_EXTRACT__( 1, 7, 89.78, "Postman" )

	/' Compiler output:
	89.78
	'/
	   

	'   In this example, the '__FB_EVAL__' is absolutely mandatory in this 'print_last' macro,
	'   because the numeric expression '__FB_ARG_COUNT__( args ) - 1' must be fully evaluated
	'   before being used as the index argument of '__FB_ARG_EXTRACT__'

	#macro print_last( args... )
	   #define last_arg_num __FB_EVAL__( __FB_ARG_COUNT__( args ) - 1 )
	   #print __FB_ARG_EXTRACT__( last_arg_num, args )
	#endmacro

	print_last( 7, 89.78, "Postman" )

	/' Compiler output:
	Postman
	'/
	   

Version
	* Since fbc 1.08.0

Differences from QB
	* New to FreeBASIC

See also
	* KeyPgDdfbargleftof__FB_ARG_LEFTOF__
	* KeyPgDdfbargrightof__FB_ARG_RIGHTOF__
	* KeyPgDdfbargcount__FB_ARG_COUNT__
	* KeyPgDdfbarglistexpand__Fb_Arg_Listexpand__

