| .. Sequences/Concepts//Bidirectional Sequence |20 |
| |
| Bidirectional Sequence |
| ====================== |
| |
| Description |
| ----------- |
| |
| A |Bidirectional Sequence| is a |Forward Sequence| whose iterators model |
| |Bidirectional Iterator|. |
| |
| Refinement of |
| ------------- |
| |
| |Forward Sequence| |
| |
| |
| 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|. | |
| +---------------------------+-----------------------------------------------------------------------+ |
| |
| |
| Models |
| ------ |
| |
| * |vector| |
| * |range_c| |
| |
| |
| See also |
| -------- |
| |
| |Sequences|, |Forward Sequence|, |Random Access Sequence|, |Bidirectional Iterator|, |begin| / |end|, |back| |
| |
| |
| .. copyright:: Copyright © 2001-2009 Aleksey Gurtovoy and David Abrahams |
| Distributed under the Boost Software License, Version 1.0. (See accompanying |
| file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
