Concatenation operator
Concatenates two parameters of a preprocessor macro.
Syntax
token1 ## token2- token1 is a parameter of the macro or a simple token.
- token2 is a parameter of the macro or a simple token.
Usage
The double-hash operator ## can be used to merge two tokens while expanding a
macro and create a single token.
All tokens can not be merged. Usually these tokens are identifiers, or numbers.
The concatenation result produces an identifier.
Source: File
A
&define COMMAND(NAME) #NAME, NAME ## _command
COMMAND(quit) Result:
& 1 "A"
"quit", quit_command