https://stackoverflow.com/a/3685576 https://stackoverflow.com/a/3685576 There’s one approach. I wouldn’t personally recommend using macros outside of include g

https://stackoverflow.com/a/3685576 https://stackoverflow.com/a/3685576 There’s one approach. I wouldn’t personally recommend using macros outside of include guards and file inclusion. Still, if you need more functionality, the methods exist.