Operator ## (Preprocessor Concatenate)operator

Preprocessor operator to concatenate strings

Operatorsoperatordocumented

Syntax

text##text

Description

This operator creates a new token by concatenating the texts at both sides of it. This text can be recognized by other macros and further expanded. One use, is to create a macro that expands to different macro names, variable names, and function names depending on the arguments received.

Note:

In macro/define's use '##_' to escape line continuation character '_' to allow multiple lines of macro expanded code to be combined into a single statement.

Remarks

Version

Before fbc 1.08.0, '##_' did not allow to escape line continuation character '_'.

Differences from QB

New to FreeBASIC

Example

#define Concat(t,n) t##n



Print concat (12,34)



Dim Concat (hello,world) As Integer

Concat (hello,world)=99

Print helloworld

Output:

1234
99

Reference

Documented in KeyPgOpPpConcat.html