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Re: Chapter 17, Section 4
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Posted: Jan 29, 2008 6:34 PM
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> I dont understand this code:
>
> def append[U >: T](x: Y) =
> new Queue(leading, x :: trailing)
>
> What is the meaning of Y? Shouldn it be U instead?
Yes it should be U.
Similarly, in Figure 17.1
def append[T](x: t)
should be
def append[T](x: T)
Also, when I tried to compile Figure 17.1, I needed to change
class Queue[+T](leading: List[T], trailing: List[T])
to
class Queue[T](val leading: List[T], val trailing: List[T])
I'm not up to chapter 17 in my reading yet, so I'll leave it at that for now.
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