• Salih Dincer (37/37) Sep 27 2021 ```d
• Dukc (4/7) Sep 27 2021 I don't think D will automatically use a common interface as a

Salih Dincer <salihdb hotmail.com> writes:

```d
interface ICon
{
   string Str();
}

class Foo : ICon
{
   string Str() {
     return "Foo";
   }
}

class Bar : ICon
{
   string Str() {
     return "Bar";
   }
}

import std.stdio;

void main()
{
   auto foo = new Foo();
   ICon bar = new Bar();
   /* replace ICon with auto,
    * please...*/
   auto test =
   [
     foo, bar
   ];
   foreach(t; test)
   {
     t.Str.writeln;
   }
}
```

It is thrown an error* because of type object.Object[].

(*) DIsampleFoo.d(34): Error: no property `Str` for type 
`object.Object`

Dukc <ajieskola gmail.com> writes:

On Monday, 27 September 2021 at 19:36:04 UTC, Salih Dincer wrote:
 It is thrown an error* because of type object.Object[].

 (*) DIsampleFoo.d(34): Error: no property `Str` for type 
 `object.Object`

I don't think D will automatically use a common interface as a 
base type. Either change `auto test` to `ICon[] test` or make 
`ICon` an abstract class, and I think it'll work.