The X Macro using D

[Patrick Schluter via Digitalmars-d]

On Thursday, 20 July 2017 at 21:17:45 UTC, Walter Bright wrote:
> Some time ago, I wrote about the X Macro in C:
>
>   https://digitalmars.com/articles/b51.html
>
> I used it from time to time in C code. It's one of the things I 
> actually like about the C preprocessor. But in translating the 
> aged C code to D it was time to make X work in D. Here's the C 
> code, followed by the D translation.
>
In C there's no point in the X macro anymore since C99.
Designated initializer allow to do it properly[1] now.

     enum COLORS { red, blue, green, max };
     char *cstring[max] = {[red]="red", [blue]="blue", 
[green]="green" };  /* C99 */

It works also with array indexes[2].

     int a[3] = { [2]=1, [0]=3, [1]=2 };  /* C99 designated 
initializer */
     int a[3] = { [2]=1, [0]=3, 2 };      /* C99 designated 
initializer */

C++ hasn't yet integrated.


[1]: https://dlang.org/ctod.html#arrayenum
[2]: https://dlang.org/ctod.html#arrayinit2