__Fb_Arg_Listexpand__keyword

Intrinsic define (macro) performed by the compiler.

Syntax

__FB_ARG_LISTEXPAND__( macroname, macroargcount, args... )

Parameters

Name		Description
`macroname`		name of the macro used for extension calls
`macroargcount`		number of parameters for the 'macroname' macro expand the parameter list 'args...' according to the 'macroargcount' value: - 'macroargcount > 0' : pass 'macroargcount' parameters each time - 'macroargcount = 0' : pass all parameters - 'macroargcount < 0' : for each parameter passed, the previous 'macroargcount' parameters are automatically removed on the next pass
`args...`		argument list

Description

Expands to one or more 'macroname( .... )' depending on the value of macroargcount and number of arguments in the args... list.

Returns empty string on invalid index, rather than compile error.

Remarks

Version

Since fbc 1.20.0

Differences from QB

New to FreeBASIC

Example

#macro m( arg... )

    #print "   "##arg

#endmacro



#print "macroargcount>0 (=1):"

__FB_ARG_LISTEXPAND__( m, 1, Hello1, Hello2, Hello3, Hello4)

#print " "

#print "macroargcount=0 (=0):"

__FB_ARG_LISTEXPAND__( m, 0, Hello1, Hello2, Hello3, Hello4)

#print " "

#print "macroargcount<0 (=-1):"

__FB_ARG_LISTEXPAND__( m, -1, Hello1, Hello2, Hello3, Hello4)





/' Compiler output:

macroargcount>0 (=1):

   Hello1

   Hello2

   Hello3

   Hello4

 

macroargcount=0 (=0):

   Hello1, Hello2, Hello3, Hello4

 

macroargcount<0 (=-1):

   Hello1, Hello2, Hello3, Hello4

   Hello2, Hello3, Hello4

   Hello3, Hello4

   Hello4

'/

Reference

Documented in KeyPgDdfbarglistexpand.html