C to D: please help translate this weird macro

[Ki Rill]

On Wednesday, 20 September 2023 at 17:14:41 UTC, Dejan Lekic 
wrote:
> [...]
>
> NK_CONTAINER_OF should probably be translated to:
>
> `cast(T*)((cast(void*)ptr - __traits(getMember, T, 
> member).offsetof))`
>
> PS. I did not invent this. My original idea was far worse than 
> this. - It was suggested on IRC by a much cleverer D programmer 
> than myself - Herringway at IRC

Thanks! I translated it to this originally after looking at the 
links you've provided:
```D
auto nk_container_of(P, T)(P ptr, T type, size_t member_offsetof)
{
     return cast(T*)(cast(void*)(cast(char*)(1 ? (ptr) : ptr - 
member_offsetof)));
}
```

> `cast(T*)((cast(void*)ptr - __traits(getMember, T, 
> member).offsetof))`

Now, how should I wrap it like a macro? Template mixin? I'm not 
that familiar with D meta programming... I shall skim through the 
`D templates tutorial` for hints.