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A stream is a stateful object that effectively combines a sequence and an iteration state for that sequence. Unlike iterating through a sequence, iterating through a stream changes the stream.
The following method requirements constitute the stream protocol:
defprotocol stream end?(x is stream) is boolean next(x is stream) ; returns next element advance(x is stream)Their behavior is very similar to the methods of the same names of the sequence protocol. There is no start-iteration method, as this happens automatically when a stream is created. The advance method does not return anything in particular.
There is a pseudo-constructor method stream that takes a sequence and returns a stream that iterates through that sequence.
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