Added zip_iterator docs

[SVN r21988]
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Dave Abrahams committed 2004-01-27 04:12:54 +00:00
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The zip iterator provides the ability to parallel-iterate
over several controlled sequences simultaneously. A zip
iterator is constructed from a tuple of iterators. Moving
the zip iterator moves all the iterators in parallel.
Dereferencing the zip iterator returns a tuple that contains
the results of dereferencing the individual iterators.