[OT] #define

[biocyberman via Digitalmars-d-learn]

On Monday, 22 May 2017 at 13:11:15 UTC, Andrew Edwards wrote:
> Sorry if this is a stupid question but it eludes me. In the 
> following, what is THING? What is SOME_THING?
>
>     #ifndef THING
>     #define THING
>     #endif
>
>     #ifndef SOME_THING
>     #define SOME_THING THING *
>     #endif
>
> Is this equivalent to:
>
>     alias thing = void;
>     alias someThing = thing*;
>
> Thanks,
> Andrew

Hi Andrew
This is why need to learn more about C and C++ when I want to 
port them to D. You can get a bit of reading about C preprocessor 
here: 
https://www.tutorialspoint.com/cprogramming/c_preprocessors.htm

Regarding your question: I've been porting some C code with 
macros, they can be translated into D as aliases, functions, 
structs, templates, mixins etc. So maybe an excerpt from the real 
code would be more straight forward.