class Object with Dependency Injection

[Salih Dincer]

On Sunday, 18 June 2023 at 16:58:15 UTC, Ali Çehreli wrote:
> The problem is with the deduced type of 'services'. I don't 
> know the mechanism behind it but the common type of 'truck' and 
> 'ship' are deduced to be Object. Apparently, their interfaces 
> don't take part in that decision. I don't know why.

This is very interesting because it looks like a bug.  Why is 
there no problem in an abstracted object, but things get confused 
in the interface (ITransport)?

On Sunday, 18 June 2023 at 16:58:15 UTC, Ali Çehreli wrote:
> One solution is to help the compiler by casting them to your 
> desired interface:

In fact, there is no need to cast:

```d
interface ITransport
{
   string deliver();
}

//...

void main()
{
   auto truck = new Truck;
   ITransport ship = new Ship;

/* or
   ITransport truck = new Truck;
   auto ship = new Ship;

// or

   ITransport truck = new Truck;
   ITransport ship = new Ship;//*/
}
```

SDB at 78