iterator</a>, which can be used to implement 6 bit integer =&gt; base64 code.

<h3>Dataflow Iterators</h3>
Unfortunately, not all iterators which inherit from Iterator Adaptors are guarenteed
to meet the composability goals stated above.  To accomplish this purpose, they have
to be written with some additional considerations in mind.

We define a Dataflow Iterator as an class inherited from <code style="white-space: normal">iterator_adaptor</code> which
fulfills as a small set of additional requirements.

<