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downloads/boost_1_33_1/libs/mpl/doc/src/refmanual/BidirectionalSequence.rst
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Bidirectional Sequence
Description
A |Bidirectional Sequence| is a |Forward Sequence| whose iterators model |Bidirectional Iterator|.
Refinement of
Expression requirements
In addition to the requirements defined in |Forward Sequence|, for any |Bidirectional Sequence| s the following must be met:
| Expression | Type | Complexity |
|---|---|---|
| begin<s>::type | |Bidirectional Iterator| | Amortized constant time |
| end<s>::type | |Bidirectional Iterator| | Amortized constant time |
| back<s>::type | Any type | Amortized constant time |
Expression semantics
|Semantics disclaimer...| |Forward Sequence|.
| Expression | Semantics |
|---|---|
| back<s>::type | The last element in the sequence; see |back|. |
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