Implement PeekingNext for PeekingTakeWhile.
#644
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This change implements `PeekingNext` for `PeekingTakeWhile` by composing its predicate with the predicate given to `PeekingNext::peeking_next`. This allows subsequent (and chained) calls to functions that require `PeekingNext` following `Itertools::peeking_take_while`.
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This PR implements
PeekingNextforPeekingTakeWhileby composing its predicate with the predicate given toPeekingNext::peeking_next. This allowsItertools::peeking_take_whileto be chained and for subsequent calls, including those across function boundaries, to function as expected while restoring items in the originating iterator.See also #643, which implements
PeekingNextfor mutable references. In combination, these changes allow code to generically accept types implementingPeekingNextwhereItertools::peeking_take_whilecan be used by the caller to prepare an iterator and subsequently by a function where restoring items in the originating iterator is important (i.e., the function cannot simply useIterator::peekableetc., becauseIterator::nextwould unconditionally be called on the originating iterator).