Fb Arg Listexpand

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Fb_Arg_Listexpand

Intrinsic define (macro) performed by the compiler.

Syntax

__FB_ARG_LISTEXPAND__( macroname, macroargcount, args... )

Parameters

• macroname
• macroargcount
• args...

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

Differences from QB

• New to FreeBASIC

See also

• __FB_ARG_RIGHTOF__
• __FB_ARG_LEFTOF__
• __FB_ARG_COUNT__
• __FB_ARG_EXTRACT__

Examples

#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

'/

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Category: Intrinsic Defines
Kind: keyword

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Reproduced from the FreeBASIC Wiki Manual under the GNU Free Documentation License 1.3 — with no Invariant Sections, no Front-Cover Texts and no Back-Cover Texts. Copyright © the FreeBASIC project and wiki contributors. See License.