C++'s this() equivalent?

[zjh]

```d
import core.stdc.stdio;

struct A{
     static int e=40;
     struct B{
         int m;
         this(int i){
             printf("%i",e);m=i;
         }
         ~this(){
             e=m;
             printf("%i",e);
         }
     }
     void f(){
         B b=e;e=6;
     }
     void g(){
         printf("%i",e);
     }
}

extern(C)void main(){
     A a;
     a.f();
     a.g();
}
```
I want `B` to become the following version similar to 'C++'. What 
should I do?
```cpp
struct B{
     int m;
     B(){
         printf("%i",e);m=e;
     }
     ~B(){
         e=m;
         printf("%i",e);
     }
}

```
Thank you.