C to D: please help translate this weird macro

[Ki Rill]

On Wednesday, 20 September 2023 at 13:53:08 UTC, Ki Rill wrote:
> Here is the macro:
>
> ```C
> #define NK_CONTAINER_OF(ptr,type,member)\
>     (type*)((void*)((char*)(1 ? (ptr): &((type*)0)->member) - 
> NK_OFFSETOF(type, member)))
> ```
>
> I'm trying to translate the Nuklear GUI library to D 
> [here](https://github.com/rillki/nuklear-d/tree/nuklear-d-translation).

Here is how `NK_OFFSETOF` is defined:
```c
#define NK_OFFSETOF(st,m) ((nk_ptr)&(((st*)0)->m))
```