BidirectionalIterator is a
ForwardIterator that can be moved in both directions (i.e. incremented and decremented).
b, iterators of type
reference,the type denoted by
The following expressions must be valid and have their specified effects.
| || ||Preconditions:
| || convertible to ||
| || |
mutable BidirectionalIterator is a
BidirectionalIterator that additionally satisfies the
The begin iterator is not decrementable and the behavior is undefined if
--container.begin() is evaluated.
A bidirectional iterator does not have to be dereferenceable to be decrementable (in particular, the end iterator is not dereferenceable but is decrementable).
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