| .. Sequences/Concepts//Front Extensible Sequence |50 |
| |
| Front Extensible Sequence |
| ========================= |
| |
| Description |
| ----------- |
| |
| A |Front Extensible Sequence| is an |Extensible Sequence| that supports amortized constant |
| time insertion and removal operations at the beginning. |
| |
| Refinement of |
| ------------- |
| |
| |Extensible Sequence| |
| |
| |
| Expression requirements |
| ----------------------- |
| |
| In addition to the requirements defined in |Extensible Sequence|, |
| for any |Back Extensible Sequence| ``s`` the following must be met: |
| |
| +-------------------------------+-------------------------------+---------------------------+ |
| | Expression | Type | Complexity | |
| +===============================+===============================+===========================+ |
| | ``push_front<s,x>::type`` | |Front Extensible Sequence| | Amortized constant time | |
| +-------------------------------+-------------------------------+---------------------------+ |
| | ``pop_front<s>::type`` | |Front Extensible Sequence| | Amortized constant time | |
| +-------------------------------+-------------------------------+---------------------------+ |
| | ``front<s>::type`` | Any type | Amortized constant time | |
| +-------------------------------+-------------------------------+---------------------------+ |
| |
| |
| Expression semantics |
| -------------------- |
| |
| |Semantics disclaimer...| |Extensible Sequence|. |
| |
| +-------------------------------+-----------------------------------------------------------+ |
| | Expression | Semantics | |
| +===============================+===========================================================+ |
| | ``push_front<s,x>::type`` | Equivalent to ``insert<s,begin<s>::type,x>::type``; | |
| | | see |push_front|. | |
| +-------------------------------+-----------------------------------------------------------+ |
| | ``pop_front<v>::type`` | Equivalent to ``erase<s,begin<s>::type>::type``; | |
| | | see |pop_front|. | |
| +-------------------------------+-----------------------------------------------------------+ |
| | ``front<s>::type`` | The first element in the sequence; see |front|. | |
| +-------------------------------+-----------------------------------------------------------+ |
| |
| |
| Models |
| ------ |
| |
| * |vector| |
| * |list| |
| |
| |
| See also |
| -------- |
| |
| |Sequences|, |Extensible Sequence|, |Back Extensible Sequence|, |push_front|, |pop_front|, |front| |
| |
| |
| .. 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) |
