Information about the 'magic' field in object.Object class

[kinke]

On Thursday, 16 January 2020 at 15:28:06 UTC, realhet wrote:
> Update:
> - All of the child classes needed to be marked with extern(C++)
> - static class members are not supported, only __gshared static.
> - passing a delegate to a constructor of this class expects a 
> (extern(C++) delegate) too.
> - Internal compiler error: string[string] can not be mapped to 
> C++
>
> So extern(C++) is not good in the current case.

The 3 latter points can be trivially worked around via extern(D):

extern(C++) class C
{
     extern(D):
     static int tlsGlobal;
     this(void delegate()) {}
     void foo(string[string] aa) {}
}

void main()
{
     C.tlsGlobal = 123;
     auto c = new C(() {});
     c.foo(null);
}

> I will not do any synchronization, but I think the GC will 
> crash upon releasing these objects.

Very likely.