[swift-users] Can't implement generic subscript in protocol

[Joanna Carter via swift-users]

Greetings

Now we've got generic subscripts, I thought I'd play…

protocol DataProvider
{
  subscript<itemType>(index: Int) -> itemType { get }
}

class Test : DataProvider // error : Type 'Test' does not conform to protocol 
'DataProvider'
{
  subscript(index: Int) -> String
  {
    return "Fred"
  }
}

Simple questions:

1. why does this not compile?
2. should it?
3. is there a workaround without declaring an associated type in the protocol?

Joanna

--
Joanna Carter
Carter Consulting

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