24 Containers library [containers]

24.2 Requirements [container.requirements]

24.2.2 General containers [container.requirements.general]

24.2.2.3 Reversible container requirements [container.rev.reqmts]

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A type X meets the reversible container requirements if X meets the container requirements, the iterator type of X belongs to the bidirectional or random access iterator categories ([iterator.requirements]), and the following types and expressions are well-formed and have the specified semantics.
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typename X::reverse_iterator
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Result: The type reverse_iterator<X​::​iterator>, an iterator type whose value type is T.
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typename X::const_reverse_iterator
3
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Result: The type reverse_iterator<X​::​const_iterator>, a constant iterator type whose value type is T.
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a.rbegin()
4
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Result: reverse_iterator; const_reverse_iterator for constant a.
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Returns: reverse_iterator(end())
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Complexity: Constant.
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a.rend()
7
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Result: reverse_iterator; const_reverse_iterator for constant a.
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Returns: reverse_iterator(begin())
9
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Complexity: Constant.
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a.crbegin()
10
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Result: const_reverse_iterator.
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Returns: const_cast<X const&>(a).rbegin()
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Complexity: Constant.
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a.crend()
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Result: const_reverse_iterator.
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Returns: const_cast<X const&>(a).rend()
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Complexity: Constant.