class A { static B b; } class B {}

doing b = new B() does NOT work.

Nor could I create a this() {} at module level

On 30.01.2016 22:52, Enjoys Math wrote:
>
> class A { static B b; } class B {}
>
> doing b = new B() does NOT work.
>
> Nor could I create a this() {} at module level

It works when you make b const/immutable:

class A {static immutable B b = new B;} class B {}

If you want/need b to be mutable, you can use a static constructor (`static this`), either in the class or the module:

class A {static B b; static this() {b = new B;}} class B {}
class A {static B b;} static this() {A.b = new B;} class B {}

You could also set it in `main` or another function that runs before b is used, of course.

On Saturday, 30 January 2016 at 21:52:20 UTC, Enjoys Math wrote:
>
> class A { static B b; } class B {}
>
> doing b = new B() does NOT work.
>
> Nor could I create a this() {} at module level

More info:

B : A

so I can't do

class A {
  this () {
    if (b is null) {
        b = new B();
    }
}
}

Since it OVERFLOWS THE STACK!!

On Sat, 30 Jan 2016 22:02:10 +0000, Enjoys Math wrote:

> On Saturday, 30 January 2016 at 21:52:20 UTC, Enjoys Math wrote:
>>
>> class A { static B b; } class B {}
>>
>> doing b = new B() does NOT work.
>>
>> Nor could I create a this() {} at module level
> 
> More info:
> 
> B : A
> 
> so I can't do
> 
> class A {
>    this () {
>      if (b is null) {
>          b = new B();
>      }
> }
> }

You should use a static constructor:

class A {
  static B b;
  static this() { b = new B(); }
}