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Showing content from https://timsong-cpp.github.io/cppwp/n4140/bidirectional.iterators below:

[bidirectional.iterators]

A class or pointer type X satisfies the requirements of a bidirectional iterator if, in addition to satisfying the requirements for forward iterators, the following expressions are valid as shown in Table [tab:iterator.bidirectional.requirements].

Table

110

— Bidirectional iterator requirements (in addition to forward iterator)


Expression Return type Operational Assertion/note semantics pre-/post-condition -- r X& pre: there exists s such that r == ++s.
post: r is dereferenceable.
--(++r) == r.
-- r == -- s implies r == s.
&r == &-- r. r-- convertible to const X& { X tmp = r;
-- r;
return tmp; } *r-- reference

[ Note: Bidirectional iterators allow algorithms to move iterators backward as well as forward.  — end note ]

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