From Jason Turner

[container.rev.reqmts]

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+ #### Reversible container requirements <a id="container.rev.reqmts">[[container.rev.reqmts]]</a>
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+
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+ A type `X` meets the *reversible container* requirements if `X` meets
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+ the container requirements, the iterator type of `X` belongs to the
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+ bidirectional or random access iterator categories
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+ [[iterator.requirements]], and the following types and expressions are
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+ well-formed and have the specified semantics.
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+
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+ ``` cpp
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+ typename X::reverse_iterator
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+ ```
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+
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+ *Result:* The type `reverse_iterator<X::iterator>`, an iterator type
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+ whose value type is `T`.
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+
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+ ``` cpp
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+ typename X::const_reverse_iterator
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+ ```
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+
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+ *Result:* The type `reverse_iterator<X::const_iterator>`, a constant
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+ iterator type whose value type is `T`.
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+
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+ ``` cpp
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+ a.rbegin()
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+ ```
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+
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+ *Result:* `reverse_iterator`; `const_reverse_iterator` for constant `a`.
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+
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+ *Returns:* `reverse_iterator(end())`
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+
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+ *Complexity:* Constant.
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+
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+ ``` cpp
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+ a.rend()
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+ ```
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+
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+ *Result:* `reverse_iterator`; `const_reverse_iterator` for constant `a`.
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+
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+ *Returns:* `reverse_iterator(begin())`
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+
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+ *Complexity:* Constant.
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+
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+ ``` cpp
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+ a.crbegin()
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+ ```
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+
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+ *Result:* `const_reverse_iterator`.
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+
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+ *Returns:* `const_cast<X const&>(a).rbegin()`
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+
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+ *Complexity:* Constant.
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+
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+ ``` cpp
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+ a.crend()
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+ ```
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+
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+ *Result:* `const_reverse_iterator`.
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+
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+ *Returns:* `const_cast<X const&>(a).rend()`
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+
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+ *Complexity:* Constant.
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+