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4<title>Function hash_range</title>
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26<a name="boost.hash_range"></a><div class="titlepage"></div>
27<div class="refnamediv">
28<h2><span class="refentrytitle">Function hash_range</span></h2>
29<p>boost::hash_range &#8212; 
30            Calculate the combined hash value of the elements of an iterator
31            range.
32        </p>
33</div>
34<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
35<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis">
36<span class="bold"><strong>template</strong></span>&lt;<span class="bold"><strong>typename</strong></span> It&gt; <span class="type">std::size_t</span> hash_range(It first, It last);
37<span class="bold"><strong>template</strong></span>&lt;<span class="bold"><strong>typename</strong></span> It&gt; <span class="type"><span class="bold"><strong>void</strong></span></span> hash_range(std::size_t&amp; seed, It first, It last);</pre></div>
38<div class="refsect1" lang="en">
39<a name="id1241765"></a><h2>Description</h2>
40<div class="variablelist"><table border="0">
41<col align="left" valign="top">
42<tbody>
43<tr>
44<td>
45<span class="term">Effects:</span></td>
46<td>
47<p>For the two argument overload:
48</p>
49<pre class="programlisting">
50size_t seed = 0;
51
52for(; first != last; ++first)
53{
54    <a href="hash_combine.html" title="Function template hash_combine">hash_combine</a>(seed, *first);
55}
56
57return seed;
58</pre>
59<p>
60          </p>For the three arguments overload:
61<pre class="programlisting">
62for(; first != last; ++first)
63{
64    <a href="hash_combine.html" title="Function template hash_combine">hash_combine</a>(seed, *first);
65}
66</pre>
67<p>
68          </p>
69</td>
70</tr>
71<tr>
72<td>
73<span class="term">Notes:</span></td>
74<td>
75<p>
76            <code class="computeroutput">hash_range</code> is sensitive to the order of the elements
77            so it wouldn't be appropriate to use this with an unordered
78            container.
79          </p>
80<p>This is an extension to TR1</p>
81</td>
82</tr>
83<tr>
84<td>
85<span class="term">Throws:</span></td>
86<td><p>
87          Only throws if <code class="computeroutput"><a href="hash_value.html" title="Function hash_value">hash_value</a>(std::iterator_traits&lt;It&gt;::value_type)</code>
88          throws. <code class="computeroutput">hash_range(std::size_t&amp;, It, It)</code> has basic exception safety as long as
89          <code class="computeroutput"><a href="hash_value.html" title="Function hash_value">hash_value</a>(std::iterator_traits&lt;It&gt;::value_type)</code>
90          has basic exception safety.
91        </p></td>
92</tr>
93</tbody>
94</table></div>
95</div>
96</div>
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98<td align="left"></td>
99<td align="right"><small>Copyright © 2005, 2006 Daniel James</small></td>
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