59 lines
2.0 KiB
ReStructuredText
59 lines
2.0 KiB
ReStructuredText
.. Sequences/Concepts//Bidirectional Sequence |20
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Bidirectional Sequence
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======================
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Description
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-----------
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A |Bidirectional Sequence| is a |Forward Sequence| whose iterators model
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|Bidirectional Iterator|.
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Refinement of
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-------------
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|Forward Sequence|
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Expression requirements
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-----------------------
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In addition to the requirements defined in |Forward Sequence|,
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for any |Bidirectional Sequence| ``s`` the following must be met:
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+---------------------------+-----------------------------------+---------------------------+
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| Expression | Type | Complexity |
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+===========================+===================================+===========================+
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| ``begin<s>::type`` | |Bidirectional Iterator| | Amortized constant time |
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+---------------------------+-----------------------------------+---------------------------+
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| ``end<s>::type`` | |Bidirectional Iterator| | Amortized constant time |
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+---------------------------+-----------------------------------+---------------------------+
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| ``back<s>::type`` | Any type | Amortized constant time |
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+---------------------------+-----------------------------------+---------------------------+
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Expression semantics
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--------------------
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|Semantics disclaimer...| |Forward Sequence|.
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+---------------------------+-----------------------------------------------------------------------+
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| Expression | Semantics |
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+===========================+=======================================================================+
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| ``back<s>::type`` | The last element in the sequence; see |back|. |
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+---------------------------+-----------------------------------------------------------------------+
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Models
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------
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* |vector|
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* |range_c|
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See also
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--------
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|Sequences|, |Forward Sequence|, |Random Access Sequence|, |Bidirectional Iterator|, |begin| / |end|, |back|
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