how to initialise const variables

[cym13 via Digitalmars-d-learn]

On Friday, 26 February 2016 at 02:32:44 UTC, Nicholas Wilson 
wrote:
> struct A
> {
>      const (void *) p;
> }
>
> struct B
> {
>     A    a;
>     this(void * _p)
>     {
>         a.p = _p;
>     }
> }
>
> I cannot change the definition of A
> how do I initialise b.a.p?

As you did:

     void main() {
         int i = 42;
         B b = B(&i);
         int* p = cast(int*)b.a.p;
         assert(*p == 42);
     }