Re: Default implementations in inherited interfaces

[Lodovico Giaretta via Digitalmars-d-learn]

On Thursday, 21 July 2016 at 09:41:27 UTC, Saurabh Das wrote:
I have an interface A which declares a certain function. A 
second interface B inherits from A and wishes to provide a 
default implementation for that function. How can I achieve 
this? I'm facing an error when I try this:

interface A
{
    int func(int);
}

interface B : A
{
    final int func(int)
    {
        return 0;
    }
}

class C : B
{
}

rdmd it.d:
it.d(14): Error: class it.C interface function 'int func(int)' 
is not implemented

Thanks,
Saurabh

Interesting.
This is worth a bugzilla issue, IMHO. In fact, if you try the 
other way (i.e.: you provide an implementation of func in class 
C), you get the opposite error, that you are overriding a final 
function (B.func).