C to D: please help translate this weird macro

[Ki Rill]

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).