We prefer index style. In the past I believe we could not measure a difference
in performance.
One benefit of the index style is that it is more terse, and often easier to
read than the iterator style, which requires repeating the type name twice to
declare the start and end value of the vector.
Another benefit of the index style is that it behaves predictably if elements
are added to the vector while iterating it. The pointer style can easily end up
accessing freed memory.
A benefit of the pointer style is that it could theoretically be faster because
there is no need to refetch the vector base address.
-- Darin
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