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  26 <div class="titlepage"><div><div><h3 class="title">
  27 <a name="the_boost_algorithm_library.CXX11.none_of"></a><a class="link" href="none_of.html" title="none_of">none_of</a>
  28 </h3></div></div></div>
  29 <p>
  30         The header file 'boost/algorithm/cxx11/none_of.hpp' contains four variants
  31         of a single algorithm, <code class="computeroutput"><span class="identifier">none_of</span></code>.
  32         The algorithm tests all the elements of a sequence and returns true if they
  33         none of them share a property.
  34       </p>
  35 <p>
  36         The routine <code class="computeroutput"><span class="identifier">none_of</span></code> takes
  37         a sequence and a predicate. It will return true if the predicate returns
  38         false when applied to every element in the sequence.
  39       </p>
  40 <p>
  41         The routine <code class="computeroutput"><span class="identifier">none_of_equal</span></code>
  42         takes a sequence and a value. It will return true if none of the elements
  43         in the sequence compare equal to the passed in value.
  44       </p>
  45 <p>
  46         Both routines come in two forms; the first one takes two iterators to define
  47         the range. The second form takes a single range parameter, and uses Boost.Range
  48         to traverse it.
  49       </p>
  50 <h5>
  51 <a name="the_boost_algorithm_library.CXX11.none_of.h0"></a>
  52         <span class="phrase"><a name="the_boost_algorithm_library.CXX11.none_of.interface"></a></span><a class="link" href="none_of.html#the_boost_algorithm_library.CXX11.none_of.interface">interface</a>
  53       </h5>
  54 <p>
  55         The function <code class="computeroutput"><span class="identifier">none_of</span></code> returns
  56         true if the predicate returns false for every item in the sequence. There
  57         are two versions; one takes two iterators, and the other takes a range.
  58       </p>
  59 <p>
  60 </p>
  61 <pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span> <span class="keyword">namespace</span> <span class="identifier">algorithm</span> <span class="special">{</span>
  62 <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">InputIterator</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Predicate</span><span class="special">&gt;</span>
  63         <span class="keyword">bool</span> <span class="identifier">none_of</span> <span class="special">(</span> <span class="identifier">InputIterator</span> <span class="identifier">first</span><span class="special">,</span> <span class="identifier">InputIterator</span> <span class="identifier">last</span><span class="special">,</span> <span class="identifier">Predicate</span> <span class="identifier">p</span> <span class="special">);</span>
  64 <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Range</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Predicate</span><span class="special">&gt;</span>
  65         <span class="keyword">bool</span> <span class="identifier">none_of</span> <span class="special">(</span> <span class="keyword">const</span> <span class="identifier">Range</span> <span class="special">&amp;</span><span class="identifier">r</span><span class="special">,</span> <span class="identifier">Predicate</span> <span class="identifier">p</span> <span class="special">);</span>
  66 <span class="special">}}</span>
  67 </pre>
  68 <p>
  69       </p>
  70 <p>
  71         The function <code class="computeroutput"><span class="identifier">none_of_equal</span></code>
  72         is similar to <code class="computeroutput"><span class="identifier">none_of</span></code>, but
  73         instead of taking a predicate to test the elements of the sequence, it takes
  74         a value to compare against.
  75       </p>
  76 <p>
  77 </p>
  78 <pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span> <span class="keyword">namespace</span> <span class="identifier">algorithm</span> <span class="special">{</span>
  79 <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">InputIterator</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">V</span><span class="special">&gt;</span>
  80         <span class="keyword">bool</span> <span class="identifier">none_of_equal</span> <span class="special">(</span> <span class="identifier">InputIterator</span> <span class="identifier">first</span><span class="special">,</span> <span class="identifier">InputIterator</span> <span class="identifier">last</span><span class="special">,</span> <span class="identifier">V</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="identifier">val</span> <span class="special">);</span>
  81 <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Range</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">V</span><span class="special">&gt;</span>
  82         <span class="keyword">bool</span> <span class="identifier">none_of_equal</span> <span class="special">(</span> <span class="keyword">const</span> <span class="identifier">Range</span> <span class="special">&amp;</span><span class="identifier">r</span><span class="special">,</span> <span class="identifier">V</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="identifier">val</span> <span class="special">);</span>
  83 <span class="special">}}</span>
  84 </pre>
  85 <p>
  86       </p>
  87 <h5>
  88 <a name="the_boost_algorithm_library.CXX11.none_of.h1"></a>
  89         <span class="phrase"><a name="the_boost_algorithm_library.CXX11.none_of.examples"></a></span><a class="link" href="none_of.html#the_boost_algorithm_library.CXX11.none_of.examples">Examples</a>
  90       </h5>
  91 <p>
  92         Given the container <code class="computeroutput"><span class="identifier">c</span></code> containing
  93         <code class="computeroutput"><span class="special">{</span> <span class="number">0</span><span class="special">,</span> <span class="number">1</span><span class="special">,</span>
  94         <span class="number">2</span><span class="special">,</span> <span class="number">3</span><span class="special">,</span> <span class="number">14</span><span class="special">,</span> <span class="number">15</span> <span class="special">}</span></code>,
  95         then
  96 </p>
  97 <pre class="programlisting"><span class="keyword">bool</span> <span class="identifier">isOdd</span> <span class="special">(</span> <span class="keyword">int</span> <span class="identifier">i</span> <span class="special">)</span> <span class="special">{</span> <span class="keyword">return</span> <span class="identifier">i</span> <span class="special">%</span> <span class="number">2</span> <span class="special">==</span> <span class="number">1</span><span class="special">;</span> <span class="special">}</span>
  98 <span class="keyword">bool</span> <span class="identifier">lessThan10</span> <span class="special">(</span> <span class="keyword">int</span> <span class="identifier">i</span> <span class="special">)</span> <span class="special">{</span> <span class="keyword">return</span> <span class="identifier">i</span> <span class="special">&lt;</span> <span class="number">10</span><span class="special">;</span> <span class="special">}</span>
  99
 100 <span class="keyword">using</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">algorithm</span><span class="special">;</span>
 101
 102 <span class="identifier">none_of</span> <span class="special">(</span> <span class="identifier">c</span><span class="special">,</span> <span class="identifier">isOdd</span> <span class="special">)</span> <span class="special">--&gt;</span> <span class="keyword">false</span>
 103 <span class="identifier">none_of</span> <span class="special">(</span> <span class="identifier">c</span><span class="special">.</span><span class="identifier">begin</span> <span class="special">(),</span> <span class="identifier">c</span><span class="special">.</span><span class="identifier">end</span> <span class="special">(),</span> <span class="identifier">lessThan10</span> <span class="special">)</span> <span class="special">--&gt;</span> <span class="keyword">false</span>
 104 <span class="identifier">none_of</span> <span class="special">(</span> <span class="identifier">c</span><span class="special">.</span><span class="identifier">begin</span> <span class="special">()</span> <span class="special">+</span> <span class="number">4</span><span class="special">,</span> <span class="identifier">c</span><span class="special">.</span><span class="identifier">end</span> <span class="special">(),</span> <span class="identifier">lessThan10</span> <span class="special">)</span> <span class="special">--&gt;</span> <span class="keyword">true</span>
 105 <span class="identifier">none_of</span> <span class="special">(</span> <span class="identifier">c</span><span class="special">.</span><span class="identifier">end</span> <span class="special">(),</span> <span class="identifier">c</span><span class="special">.</span><span class="identifier">end</span> <span class="special">(),</span> <span class="identifier">isOdd</span> <span class="special">)</span> <span class="special">--&gt;</span> <span class="keyword">true</span>  <span class="comment">// empty range</span>
 106 <span class="identifier">none_of_equal</span> <span class="special">(</span> <span class="identifier">c</span><span class="special">,</span> <span class="number">3</span> <span class="special">)</span> <span class="special">--&gt;</span> <span class="keyword">false</span>
 107 <span class="identifier">none_of_equal</span> <span class="special">(</span> <span class="identifier">c</span><span class="special">.</span><span class="identifier">begin</span> <span class="special">(),</span> <span class="identifier">c</span><span class="special">.</span><span class="identifier">begin</span> <span class="special">()</span> <span class="special">+</span> <span class="number">3</span><span class="special">,</span> <span class="number">3</span> <span class="special">)</span> <span class="special">--&gt;</span> <span class="keyword">true</span>
 108 <span class="identifier">none_of_equal</span> <span class="special">(</span> <span class="identifier">c</span><span class="special">.</span><span class="identifier">begin</span> <span class="special">(),</span> <span class="identifier">c</span><span class="special">.</span><span class="identifier">begin</span> <span class="special">(),</span> <span class="number">99</span> <span class="special">)</span> <span class="special">--&gt;</span> <span class="keyword">true</span>  <span class="comment">// empty range</span>
 109 </pre>
 110 <p>
 111       </p>
 112 <h5>
 113 <a name="the_boost_algorithm_library.CXX11.none_of.h2"></a>
 114         <span class="phrase"><a name="the_boost_algorithm_library.CXX11.none_of.iterator_requirements"></a></span><a class="link" href="none_of.html#the_boost_algorithm_library.CXX11.none_of.iterator_requirements">Iterator
 115         Requirements</a>
 116       </h5>
 117 <p>
 118         <code class="computeroutput"><span class="identifier">none_of</span></code> and <code class="computeroutput"><span class="identifier">none_of_equal</span></code> work on all iterators except
 119         output iterators.
 120       </p>
 121 <h5>
 122 <a name="the_boost_algorithm_library.CXX11.none_of.h3"></a>
 123         <span class="phrase"><a name="the_boost_algorithm_library.CXX11.none_of.complexity"></a></span><a class="link" href="none_of.html#the_boost_algorithm_library.CXX11.none_of.complexity">Complexity</a>
 124       </h5>
 125 <p>
 126         All of the variants of <code class="computeroutput"><span class="identifier">none_of</span></code>
 127         and <code class="computeroutput"><span class="identifier">none_of_equal</span></code> run in
 128         <span class="emphasis"><em>O(N)</em></span> (linear) time; that is, they compare against each
 129         element in the list once. If any of the comparisons succeed, the algorithm
 130         will terminate immediately, without examining the remaining members of the
 131         sequence.
 132       </p>
 133 <h5>
 134 <a name="the_boost_algorithm_library.CXX11.none_of.h4"></a>
 135         <span class="phrase"><a name="the_boost_algorithm_library.CXX11.none_of.exception_safety"></a></span><a class="link" href="none_of.html#the_boost_algorithm_library.CXX11.none_of.exception_safety">Exception
 136         Safety</a>
 137       </h5>
 138 <p>
 139         All of the variants of <code class="computeroutput"><span class="identifier">none_of</span></code>
 140         and <code class="computeroutput"><span class="identifier">none_of_equal</span></code> take their
 141         parameters by value or const reference, and do not depend upon any global
 142         state. Therefore, all the routines in this file provide the strong exception
 143         guarantee.
 144       </p>
 145 <h5>
 146 <a name="the_boost_algorithm_library.CXX11.none_of.h5"></a>
 147         <span class="phrase"><a name="the_boost_algorithm_library.CXX11.none_of.notes"></a></span><a class="link" href="none_of.html#the_boost_algorithm_library.CXX11.none_of.notes">Notes</a>
 148       </h5>
 149 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
 150 <li class="listitem">
 151             The routine <code class="computeroutput"><span class="identifier">none_of</span></code> is
 152             also available as part of the C++11 standard.
 153           </li>
 154 <li class="listitem">
 155             <code class="computeroutput"><span class="identifier">none_of</span></code> and <code class="computeroutput"><span class="identifier">none_of_equal</span></code> both return true for
 156             empty ranges, no matter what is passed to test against.
 157           </li>
 158 <li class="listitem">
 159             The second parameter to <code class="computeroutput"><span class="identifier">none_of_value</span></code>
 160             is a template parameter, rather than deduced from the first parameter
 161             (<code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">iterator_traits</span><span class="special">&lt;</span><span class="identifier">InputIterator</span><span class="special">&gt;::</span><span class="identifier">value_type</span></code>) because that allows more
 162             flexibility for callers, and takes advantage of built-in comparisons
 163             for the type that is pointed to by the iterator. The function is defined
 164             to return true if, for all elements in the sequence, the expression
 165             <code class="computeroutput"><span class="special">*</span><span class="identifier">iter</span>
 166             <span class="special">==</span> <span class="identifier">val</span></code>
 167             evaluates to false (where <code class="computeroutput"><span class="identifier">iter</span></code>
 168             is an iterator to each element in the sequence)
 169           </li>
 170 </ul></div>
 171 </div>
 172 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 173 <td align="left"></td>
 174 <td align="right"><div class="copyright-footer">Copyright &#169; 2010-2012 Marshall Clow<p>
 175         Distributed under the Boost Software License, Version 1.0. (See accompanying
 176         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>)
 177       </p>
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