1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>unique</title> 5<link rel="stylesheet" href="../../../../../../../../doc/src/boostbook.css" type="text/css"> 6<meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> 7<link rel="home" href="../../../../index.html" title="Chapter 1. Range 2.0"> 8<link rel="up" href="../mutating.html" title="Mutating algorithms"> 9<link rel="prev" href="transform.html" title="transform"> 10<link rel="next" href="unique_copy.html" title="unique_copy"> 11</head> 12<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> 13<table cellpadding="2" width="100%"><tr> 14<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../../../../boost.png"></td> 15<td align="center"><a href="../../../../../../../../index.html">Home</a></td> 16<td align="center"><a href="../../../../../../../../libs/libraries.htm">Libraries</a></td> 17<td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> 18<td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> 19<td align="center"><a href="../../../../../../../../more/index.htm">More</a></td> 20</tr></table> 21<hr> 22<div class="spirit-nav"> 23<a accesskey="p" href="transform.html"><img src="../../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../mutating.html"><img src="../../../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="unique_copy.html"><img src="../../../../../../../../doc/src/images/next.png" alt="Next"></a> 24</div> 25<div class="section"> 26<div class="titlepage"><div><div><h5 class="title"> 27<a name="range.reference.algorithms.mutating.unique"></a><a class="link" href="unique.html" title="unique">unique</a> 28</h5></div></div></div> 29<h6> 30<a name="range.reference.algorithms.mutating.unique.h0"></a> 31 <span class="phrase"><a name="range.reference.algorithms.mutating.unique.prototype"></a></span><a class="link" href="unique.html#range.reference.algorithms.mutating.unique.prototype">Prototype</a> 32 </h6> 33<p> 34</p> 35<pre class="programlisting"><span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">ForwardRange</span><span class="special">></span> 36<span class="keyword">typename</span> <span class="identifier">range_return</span><span class="special"><</span><span class="identifier">ForwardRange</span><span class="special">,</span> <span class="identifier">return_begin_found</span><span class="special">>::</span><span class="identifier">type</span> 37<span class="identifier">unique</span><span class="special">(</span><span class="identifier">ForwardRange</span><span class="special">&</span> <span class="identifier">rng</span><span class="special">);</span> 38 39<span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">ForwardRange</span><span class="special">></span> 40<span class="keyword">typename</span> <span class="identifier">range_return</span><span class="special"><</span><span class="keyword">const</span> <span class="identifier">ForwardRange</span><span class="special">,</span> <span class="identifier">return_begin_found</span><span class="special">>::</span><span class="identifier">type</span> 41<span class="identifier">unique</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">ForwardRange</span><span class="special">&</span> <span class="identifier">rng</span><span class="special">);</span> 42 43<span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">ForwardRange</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">BinaryPredicate</span><span class="special">></span> 44<span class="keyword">typename</span> <span class="identifier">range_return</span><span class="special"><</span><span class="identifier">ForwardRange</span><span class="special">,</span> <span class="identifier">return_begin_found</span><span class="special">>::</span><span class="identifier">type</span> 45<span class="identifier">unique</span><span class="special">(</span><span class="identifier">ForwardRange</span><span class="special">&</span> <span class="identifier">rng</span><span class="special">,</span> <span class="identifier">BinaryPredicate</span> <span class="identifier">pred</span><span class="special">);</span> 46 47<span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">ForwardRange</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">BinaryPredicate</span><span class="special">></span> 48<span class="keyword">typename</span> <span class="identifier">range_return</span><span class="special"><</span><span class="keyword">const</span> <span class="identifier">ForwardRange</span><span class="special">,</span> <span class="identifier">return_begin_found</span><span class="special">>::</span><span class="identifier">type</span> 49<span class="identifier">unique</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">ForwardRange</span><span class="special">&</span> <span class="identifier">rng</span><span class="special">,</span> <span class="identifier">BinaryPredicate</span> <span class="identifier">pred</span><span class="special">);</span> 50 51<span class="keyword">template</span><span class="special"><</span><span class="identifier">range_return_value</span> <span class="identifier">re</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">ForwardRange</span><span class="special">></span> 52<span class="keyword">typename</span> <span class="identifier">range_return</span><span class="special"><</span><span class="identifier">ForwardRange</span><span class="special">,</span> <span class="identifier">re</span><span class="special">>::</span><span class="identifier">type</span> 53<span class="identifier">unique</span><span class="special">(</span><span class="identifier">ForwardRange</span><span class="special">&</span> <span class="identifier">rng</span><span class="special">);</span> 54 55<span class="keyword">template</span><span class="special"><</span><span class="identifier">range_return_value</span> <span class="identifier">re</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">ForwardRange</span><span class="special">></span> 56<span class="keyword">typename</span> <span class="identifier">range_return</span><span class="special"><</span><span class="keyword">const</span> <span class="identifier">ForwardRange</span><span class="special">,</span> <span class="identifier">re</span><span class="special">>::</span><span class="identifier">type</span> 57<span class="identifier">unique</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">ForwardRange</span><span class="special">&</span> <span class="identifier">rng</span><span class="special">);</span> 58 59<span class="keyword">template</span><span class="special"><</span><span class="identifier">range_return_value</span> <span class="identifier">re</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">ForwardRange</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">BinaryPredicate</span><span class="special">></span> 60<span class="keyword">typename</span> <span class="identifier">range_return</span><span class="special"><</span><span class="identifier">ForwardRange</span><span class="special">,</span> <span class="identifier">re</span><span class="special">>::</span><span class="identifier">type</span> 61<span class="identifier">unique</span><span class="special">(</span><span class="identifier">ForwardRange</span><span class="special">&</span> <span class="identifier">rng</span><span class="special">,</span> <span class="identifier">BinaryPredicate</span> <span class="identifier">pred</span><span class="special">);</span> 62 63<span class="keyword">template</span><span class="special"><</span><span class="identifier">range_return_value</span> <span class="identifier">re</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">ForwardRange</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">BinaryPredicate</span><span class="special">></span> 64<span class="keyword">typename</span> <span class="identifier">range_return</span><span class="special"><</span><span class="keyword">const</span> <span class="identifier">ForwardRange</span><span class="special">,</span> <span class="identifier">re</span><span class="special">>::</span><span class="identifier">type</span> 65<span class="identifier">unique</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">ForwardRange</span><span class="special">&</span> <span class="identifier">rng</span><span class="special">,</span> <span class="identifier">BinaryPredicate</span> <span class="identifier">pred</span><span class="special">);</span> 66</pre> 67<p> 68 </p> 69<h6> 70<a name="range.reference.algorithms.mutating.unique.h1"></a> 71 <span class="phrase"><a name="range.reference.algorithms.mutating.unique.description"></a></span><a class="link" href="unique.html#range.reference.algorithms.mutating.unique.description">Description</a> 72 </h6> 73<p> 74 <code class="computeroutput"><span class="identifier">unique</span></code> removes all but 75 the first element of each sequence of duplicate encountered in <code class="computeroutput"><span class="identifier">rng</span></code>. 76 </p> 77<p> 78 Elements in the range <code class="computeroutput"><span class="special">[</span><span class="identifier">new_last</span><span class="special">,</span> 79 <span class="identifier">end</span><span class="special">(</span><span class="identifier">rng</span><span class="special">))</span></code> 80 are dereferenceable but undefined. 81 </p> 82<p> 83 Equality is determined by the predicate if one is supplied, or by <code class="computeroutput"><span class="keyword">operator</span><span class="special">==()</span></code> 84 for <code class="computeroutput"><span class="identifier">ForwardRange</span></code>'s value 85 type. 86 </p> 87<h6> 88<a name="range.reference.algorithms.mutating.unique.h2"></a> 89 <span class="phrase"><a name="range.reference.algorithms.mutating.unique.definition"></a></span><a class="link" href="unique.html#range.reference.algorithms.mutating.unique.definition">Definition</a> 90 </h6> 91<p> 92 Defined in the header file <code class="computeroutput"><span class="identifier">boost</span><span class="special">/</span><span class="identifier">range</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">unique</span><span class="special">.</span><span class="identifier">hpp</span></code> 93 </p> 94<h6> 95<a name="range.reference.algorithms.mutating.unique.h3"></a> 96 <span class="phrase"><a name="range.reference.algorithms.mutating.unique.requirements"></a></span><a class="link" href="unique.html#range.reference.algorithms.mutating.unique.requirements">Requirements</a> 97 </h6> 98<p> 99 <span class="bold"><strong>For the non-predicate versions of unique:</strong></span> 100 </p> 101<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> 102<li class="listitem"> 103 <code class="computeroutput"><span class="identifier">ForwardRange</span></code> is a 104 model of the <a class="link" href="../../../concepts/forward_range.html" title="Forward Range">Forward 105 Range</a> Concept. 106 </li> 107<li class="listitem"> 108 <code class="computeroutput"><span class="identifier">ForwardRange</span></code> is mutable. 109 </li> 110<li class="listitem"> 111 <code class="computeroutput"><span class="identifier">ForwardRange</span></code>'s value 112 type is a model of the <code class="computeroutput"><span class="identifier">EqualityComparableConcept</span></code>. 113 </li> 114</ul></div> 115<p> 116 <span class="bold"><strong>For the predicate versions of unique:</strong></span> 117 </p> 118<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> 119<li class="listitem"> 120 <code class="computeroutput"><span class="identifier">ForwardRange</span></code> is a 121 model of the <a class="link" href="../../../concepts/forward_range.html" title="Forward Range">Forward 122 Range</a> Concept. 123 </li> 124<li class="listitem"> 125 <code class="computeroutput"><span class="identifier">ForwardRange</span></code> is mutable. 126 </li> 127<li class="listitem"> 128 <code class="computeroutput"><span class="identifier">BinaryPredicate</span></code> is 129 a model of the <code class="computeroutput"><span class="identifier">BinaryPredicateConcept</span></code>. 130 </li> 131<li class="listitem"> 132 <code class="computeroutput"><span class="identifier">ForwardRange</span></code>'s value 133 type is convertible to <code class="computeroutput"><span class="identifier">BinaryPredicate</span></code>'s 134 first argument type and to <code class="computeroutput"><span class="identifier">BinaryPredicate</span></code>'s 135 second argument type. 136 </li> 137</ul></div> 138<h6> 139<a name="range.reference.algorithms.mutating.unique.h4"></a> 140 <span class="phrase"><a name="range.reference.algorithms.mutating.unique.complexity"></a></span><a class="link" href="unique.html#range.reference.algorithms.mutating.unique.complexity">Complexity</a> 141 </h6> 142<p> 143 Linear. <code class="computeroutput"><span class="identifier">O</span><span class="special">(</span><span class="identifier">N</span><span class="special">)</span></code> 144 where <code class="computeroutput"><span class="identifier">N</span></code> is <code class="computeroutput"><span class="identifier">distance</span><span class="special">(</span><span class="identifier">rng</span><span class="special">)</span></code>. 145 Exactly <code class="computeroutput"><span class="identifier">distance</span><span class="special">(</span><span class="identifier">rng</span><span class="special">)</span></code> 146 comparisons are performed. 147 </p> 148</div> 149<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 150<td align="left"></td> 151<td align="right"><div class="copyright-footer">Copyright © 2003-2010 Thorsten Ottosen, 152 Neil Groves<p> 153 Distributed under the Boost Software License, Version 1.0. (See accompanying 154 file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>) 155 </p> 156</div></td> 157</tr></table> 158<hr> 159<div class="spirit-nav"> 160<a accesskey="p" href="transform.html"><img src="../../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../mutating.html"><img src="../../../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="unique_copy.html"><img src="../../../../../../../../doc/src/images/next.png" alt="Next"></a> 161</div> 162</body> 163</html> 164
