cppdraft_translate/cppdraft/container/rev/reqmts.md

[container.rev.reqmts]

23 Containers library [containers]

23.2 Requirements [container.requirements]

23.2.2 General containers [container.requirements.general]

23.2.2.3 Reversible container requirements [container.rev.reqmts]

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A type X meets the reversible container requirements ifX 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

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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()

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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()

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Result: reverse_iterator;const_reverse_iterator for constant a.

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Returns: reverse_iterator(begin())

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Complexity: Constant.

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a.crbegin()

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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.