May I suggest a simple solution?
extension SequenceType {
/// Returns one element from the beginning of the sequence, or
`nil` if the sequence is empty.
/// If `self` is a single-pass sequence, this may consume the
element.
func one() -> Generator.Element? {
var generator = generate()
return generator.next()
}
}
This should probably be a method in the protocol, and CollectionType should
have an override which calls `first`.
The BufferedSequence stuff suggested elsewhere is probably useful too, and
should be considered in addition to this, but I think this would cover the most
common case.
--
Brent Royal-Gordon
Architechies
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