Hi, in C# you can do some thing like this.

public interface IDataErrorInfo
{
    // INDEXER	
    string this[string columnName] { get; }
  }
}

how to translate this into D2 ?
thanks in advance, bjoern

On Tue, 29 Jun 2010 09:21:34 -0400, BLS <windevguy@hotmail.de> wrote:

> Hi, in C# you can do some thing like this.
>
> public interface IDataErrorInfo
> {
>      // INDEXER	
>      string this[string columnName] { get; }
>    }
> }
>
> how to translate this into D2 ?
> thanks in advance, bjoern

string opIndex(string columnName);

On 29/06/2010 15:27, Steven Schveighoffer wrote:
> string opIndex(string columnName);

yeah this is what I did, too..
However defined as ;

interface I1 {
  string opIndex(string columnName);
}

is a no go. So can we say operator overloading within interfaces is not allowed in D2 ?

thanks again Steve.. try to learn the interface/property stuff.

BLS <windevguy@hotmail.de> wrote:

> On 29/06/2010 15:27, Steven Schveighoffer wrote:
>> string opIndex(string columnName);
>
> yeah this is what I did, too..
> However defined as ;
>
> interface I1 {
>    string opIndex(string columnName);
> }
>
> is a no go.

Hm. That should have worked.

> So can we say operator overloading within interfaces is not allowed in D2 ?

The new operator overloading scheme has problems with
interfaces. A damned shame if you ask me.

That said, opIndex does not use templates, and should thus
work no problem.


-- 
Simen

> interface I1 {
>    string opIndex(string columnName);
> }
>
> is a no go. So can we say operator overloading within interfaces is not allowed in D2 ?

It should work.
Only opBinary etc doesn't work yet cause there are problems with template functions in interfaces.

On 29/06/2010 15:35, BLS wrote:
> On 29/06/2010 15:27, Steven Schveighoffer wrote:
>> string opIndex(string columnName);
>
> yeah this is what I did, too..
> However defined as ;
>
> interface I1 {
> string opIndex(string columnName);
> }
>
> is a no go. So can we say operator overloading within interfaces is not
> allowed in D2 ?
>
> thanks again Steve.. try to learn the interface/property stuff.

Jeez, my mistake.. forget to create the implementation. sorry!

On Tue, 29 Jun 2010 09:55:50 -0400, BLS <windevguy@hotmail.de> wrote:

> On 29/06/2010 15:35, BLS wrote:
>> On 29/06/2010 15:27, Steven Schveighoffer wrote:
>>> string opIndex(string columnName);
>>
>> yeah this is what I did, too..
>> However defined as ;
>>
>> interface I1 {
>> string opIndex(string columnName);
>> }
>>
>> is a no go. So can we say operator overloading within interfaces is not
>> allowed in D2 ?
>>
>> thanks again Steve.. try to learn the interface/property stuff.
>
> Jeez, my mistake.. forget to create the implementation. sorry!

LOL!   :)

As others have said, templates do not yet work in interfaces, and there is another subtle problem: templates in interfaces are not virtual so they cannot enjoy covariance.  This is a problem for dcollections which uses operators in interfaces.

The only solution right now is to reimplement the template in the derived classes.

Not a fun situation...

-Steve