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<title>Function hash_range</title>
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<h2><span class="refentrytitle">Function hash_range</span></h2>
<p>boost::hash_range &#8212; 
            Calculate the combined hash value of the elements of an iterator
            range.
        </p>
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<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis">
<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);
<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>
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<a name="id1220222"></a><h2>Description</h2>
<p><b xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision"><span class="term">Effects</span></b>:

    For the two argument overload:
<pre class="programlisting">
size_t seed = 0;

for(; first != last; ++first)
{
    <a href="hash_combine.html" title="Function template hash_combine">hash_combine</a>(seed, *first);
}

return seed;
</pre>For the three arguments overload:
<pre class="programlisting">
for(; first != last; ++first)
{
    <a href="hash_combine.html" title="Function template hash_combine">hash_combine</a>(seed, *first);
}
</pre><p></p><br><b xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision"><span class="term">Notes</span></b>:

    <code class="computeroutput">hash_range</code> is sensitive to the order of the elements
            so it wouldn't be appropriate to use this with an unordered
            container.
          <p>This is an extension to TR1</p><br><b xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision"><span class="term">Throws</span></b>:

    
          Only throws if <code class="computeroutput"><a href="id1042434.html" title="Function hash_value">hash_value</a>(std::iterator_traits&lt;It&gt;::value_type)</code>
          throws. <code class="computeroutput">hash_range(std::size_t&amp;, It, It)</code> has basic exception safety as long as
          <code class="computeroutput"><a href="id1042434.html" title="Function hash_value">hash_value</a>(std::iterator_traits&lt;It&gt;::value_type)</code>
          has basic exception safety.
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