FB_JOIN

• Source: https://www.freebasic.net/wiki/wikka.php?wakka=KeyPgDdfbjoin
• Last revised: 2021-10-11

---

Intrinsic define (macro) performed by the compiler.

Syntax

` FB_JOIN( arg1, arg2 )

`

Parameters

arg1, arg2

left (1) and right (2) arguments to join

Description

Joins two token arguments together as one, similar to token pasting operator (##) but more powerfull (will resolve arguments before joining).

Examples

start GeSHi

#macro m ( arg1, arg2 )
    #print arg1##arg2
    #print __FB_JOIN__( arg1, arg2 )
#endmacro

m(Free, BASIC)

/' Compiler output:
FreeBASIC
FreeBASIC
'/

end GeSHi

start GeSHi

#define PREFIX p
#define SUFFIX _T

'' this won't work - arguments not expanded
#define   makename1( x )  PREFIX##x##SUFFIX

'' this will work - can do this in older versions of fbc too
#define join( a, b ) a##b
#define makename2( x ) join( PREFIX, join( x, SUFFIX ) )

'' built in __FB_JOIN__() -- works pretty much like join() above
#define   makename3( x )  __FB_JOIN__( PREFIX, __FB_JOIN__( x, SUFFIX ) )

#macro dump( arg )
    #print #arg
#endmacro

dump( makename1(text) )
dump( makename2(text) )
dump( makename3(text) )

/' Compiler output:
PREFIXtextSUFFIX
ptext_T
ptext_T
'/

end GeSHi

Version

• Since fbc 1.08.0

Differences from QB

• New to FreeBASIC

See also

• Operator ## (Preprocessor Concatenate)

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