Why does Option not extend the Iterable trait directly?
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by oxbow_lakes
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Published on 2010-04-09T11:53:38Z
Indexed on
2010/04/11
7:13 UTC
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Option is implicitly convertible to an Iterable - but why does it not just just implement Iterable directly:
def iterator = new Iterator[A] {
var end = !isDefined
def next() = {
val n = if (end) throw new NoSuchElementException() else get
end = true
n
}
def hasNext = !end
}
EDIT: In fact it's even weider than that because in 2.8 Option does declare an iterator method:
def iterator: Iterator[A] =
if (isEmpty) Iterator.empty else Iterator.single(this.get)
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