1<?xml version="1.0" encoding="utf-8" ?> 2<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 3<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> 4<head> 5<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 6<meta name="generator" content="Docutils 0.7: http://docutils.sourceforge.net/" /> 7<title>The MPL Reference Manual: Front Extensible Sequence</title> 8<link rel="stylesheet" href="../style.css" type="text/css" /> 9</head> 10<body class="docframe refmanual"> 11<table class="header"><tr class="header"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./extensible-sequence.html" class="navigation-link">Prev</a> <a href="./back-extensible-sequence.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./extensible-sequence.html" class="navigation-link">Back</a> <a href="./back-extensible-sequence.html" class="navigation-link">Along</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./concepts.html" class="navigation-link">Up</a> <a href="../refmanual.html" class="navigation-link">Home</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./refmanual_toc.html" class="navigation-link">Full TOC</a></span></td> 12<td class="header-group page-location"><a href="../refmanual.html" class="navigation-link">Front Page</a> / <a href="./sequences.html" class="navigation-link">Sequences</a> / <a href="./concepts.html" class="navigation-link">Concepts</a> / <a href="./front-extensible-sequence.html" class="navigation-link">Front Extensible Sequence</a></td> 13</tr></table><div class="header-separator"></div> 14<div class="section" id="front-extensible-sequence"> 15<h1><a class="toc-backref" href="./concepts.html#id1399">Front Extensible Sequence</a></h1> 16<div class="section" id="id17"> 17<h3><a class="subsection-title" href="#description" name="description">Description</a></h3> 18<p>A <a class="reference internal" href="./front-extensible-sequence.html">Front Extensible Sequence</a> is an <a class="reference internal" href="./extensible-sequence.html">Extensible Sequence</a> that supports amortized constant 19time insertion and removal operations at the beginning.</p> 20</div> 21<div class="section" id="id18"> 22<h3><a class="subsection-title" href="#refinement-of" name="refinement-of">Refinement of</a></h3> 23<p><a class="reference internal" href="./extensible-sequence.html">Extensible Sequence</a></p> 24</div> 25<div class="section" id="id19"> 26<h3><a class="subsection-title" href="#expression-requirements" name="expression-requirements">Expression requirements</a></h3> 27<p>In addition to the requirements defined in <a class="reference internal" href="./extensible-sequence.html">Extensible Sequence</a>, 28for any <a class="reference internal" href="./back-extensible-sequence.html">Back Extensible Sequence</a> <tt class="literal"><span class="pre">s</span></tt> the following must be met:</p> 29<table border="1" class="docutils table"> 30<colgroup> 31<col width="35%" /> 32<col width="35%" /> 33<col width="30%" /> 34</colgroup> 35<thead valign="bottom"> 36<tr><th class="head">Expression</th> 37<th class="head">Type</th> 38<th class="head">Complexity</th> 39</tr> 40</thead> 41<tbody valign="top"> 42<tr><td><tt class="literal"><span class="pre"><a href="./push-front.html" class="identifier">push_front</a><s,x>::type</span></tt></td> 43<td><a class="reference internal" href="./front-extensible-sequence.html">Front Extensible Sequence</a></td> 44<td>Amortized constant time</td> 45</tr> 46<tr><td><tt class="literal"><span class="pre"><a href="./pop-front.html" class="identifier">pop_front</a><s>::type</span></tt></td> 47<td><a class="reference internal" href="./front-extensible-sequence.html">Front Extensible Sequence</a></td> 48<td>Amortized constant time</td> 49</tr> 50<tr><td><tt class="literal"><span class="pre"><a href="./front.html" class="identifier">front</a><s>::type</span></tt></td> 51<td>Any type</td> 52<td>Amortized constant time</td> 53</tr> 54</tbody> 55</table> 56</div> 57<div class="section" id="id20"> 58<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3> 59<p>The semantics of an expression are defined only 60where they differ from, or are not defined in <a class="reference internal" href="./extensible-sequence.html">Extensible Sequence</a>.</p> 61<table border="1" class="docutils table"> 62<colgroup> 63<col width="34%" /> 64<col width="66%" /> 65</colgroup> 66<thead valign="bottom"> 67<tr><th class="head">Expression</th> 68<th class="head">Semantics</th> 69</tr> 70</thead> 71<tbody valign="top"> 72<tr><td><tt class="literal"><span class="pre"><a href="./push-front.html" class="identifier">push_front</a><s,x>::type</span></tt></td> 73<td>Equivalent to <tt class="literal"><span class="pre"><a href="./insert.html" class="identifier">insert</a><s,<a href="./begin.html" class="identifier">begin</a><s>::type,x>::type</span></tt>; 74see <a class="reference internal" href="./push-front.html">push_front</a>.</td> 75</tr> 76<tr><td><tt class="literal"><span class="pre"><a href="./pop-front.html" class="identifier">pop_front</a><v>::type</span></tt></td> 77<td>Equivalent to <tt class="literal"><span class="pre"><a href="./erase.html" class="identifier">erase</a><s,<a href="./begin.html" class="identifier">begin</a><s>::type>::type</span></tt>; 78see <a class="reference internal" href="./pop-front.html">pop_front</a>.</td> 79</tr> 80<tr><td><tt class="literal"><span class="pre"><a href="./front.html" class="identifier">front</a><s>::type</span></tt></td> 81<td>The first element in the sequence; see <a class="reference internal" href="./front.html">front</a>.</td> 82</tr> 83</tbody> 84</table> 85</div> 86<div class="section" id="id21"> 87<h3><a class="subsection-title" href="#models" name="models">Models</a></h3> 88<ul class="simple"> 89<li><a class="reference internal" href="./vector.html">vector</a></li> 90<li><a class="reference internal" href="./list.html">list</a></li> 91</ul> 92</div> 93<div class="section" id="id22"> 94<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3> 95<p><a class="reference internal" href="./sequences.html">Sequences</a>, <a class="reference internal" href="./extensible-sequence.html">Extensible Sequence</a>, <a class="reference internal" href="./back-extensible-sequence.html">Back Extensible Sequence</a>, <a class="reference internal" href="./push-front.html">push_front</a>, <a class="reference internal" href="./pop-front.html">pop_front</a>, <a class="reference internal" href="./front.html">front</a></p> 96<!-- Sequences/Concepts//Back Extensible Sequence |60 --> 97</div> 98</div> 99 100<div class="footer-separator"></div> 101<table class="footer"><tr class="footer"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./extensible-sequence.html" class="navigation-link">Prev</a> <a href="./back-extensible-sequence.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./extensible-sequence.html" class="navigation-link">Back</a> <a href="./back-extensible-sequence.html" class="navigation-link">Along</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./concepts.html" class="navigation-link">Up</a> <a href="../refmanual.html" class="navigation-link">Home</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./refmanual_toc.html" class="navigation-link">Full TOC</a></span></td> 102<td><div class="copyright-footer"><div class="copyright">Copyright © 2001-2009 Aleksey Gurtovoy and David Abrahams</div> 103Distributed under the Boost Software License, Version 1.0. (See accompanying 104file LICENSE_1_0.txt or copy at <a class="reference external" href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)</div></td></tr></table></body> 105</html> 106