Operator ## (Preprocessor Concatenate)
Preprocessor operator to concatenate strings
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:
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.
Examples:
#define Concat(t,n) t##n
Print concat (12,34)
Dim Concat (hello,world) As Integer
Concat (hello,world)=99
Print helloworld
Print concat (12,34)
Dim Concat (hello,world) As Integer
Concat (hello,world)=99
Print helloworld
Output:
1234 99
- Before fbc 1.08.0, '##_' did not allow to escape line continuation character '_'.
Differences from QB:
- New to FreeBASIC
See also:
Back to Preprocessor Operators
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