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Showing content from https://timsong-cpp.github.io/cppwp/n4659/bidirectional.iterators below:

[bidirectional.iterators]

27 Iterators library [iterators] 27.2 Iterator requirements [iterator.requirements] 27.2.6 Bidirectional iterators [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 98.

Table

98

— Bidirectional iterator requirements (in addition to forward iterator)


Expression Return type Operational Assertion/note semantics pre-/post-condition --r X& Requires: there exists s such that r == ++s.
Postconditions: 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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