return error result only from Iterator.next() #48
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This was referenced Jan 8, 2019
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@danburkert This improves on the approach in #45, based on feedback from a colleague of mine. Instead of using a trait object, which would introduce dynamic dispatch, it uses an enum to represent the two kinds of iterator, returning the Iter::Err variant from the
Cursor.iter*()methods if they fail.Thus it enables the
Cursor.iter*()methods to become infallible while avoiding dynamic dispatch.