new int[]

[ag0aep6g]

On 01/10/2018 11:35 PM, Luís Marques wrote:
> Due to compatibility with some C code, I basically need to do this:
> 
>      struct Wrapper
>      {
>          int[] x;
>      }
> 
>      void main()
>      {
>          void* ctxptr = new Wrapper([1, 2, 3]);
>          auto context = cast(Wrapper*) ctxptr;
>          writeln(context.x);
>      }
> 
> How can I do that without the wrapper? `new int[]` isn't supported, even 
> though that's exactly what I want.

If I understand correctly, the goal is to have the `int[]` itself on the 
GC heap. You can make an `int[][]` with one element, and then take the 
address of that element:

----
void main()
{
     int[]* x = &[[1, 2, 3]][0];
     int[]* x2 = [[1, 2, 3]].ptr; /* same */
}
----