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| 26 | <a name="hash_range"></a><div class="titlepage"></div> |
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| 27 | <div class="refnamediv"> |
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| 28 | <h2><span class="refentrytitle">Function hash_range</span></h2> |
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| 29 | <p>boost::hash_range — |
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| 30 | Calculate the combined hash value of the elements of an iterator |
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| 31 | range. |
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| 32 | </p> |
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| 33 | </div> |
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| 34 | <h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2> |
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| 35 | <div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"> |
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| 36 | <span class="bold"><strong>template</strong></span><<span class="bold"><strong>typename</strong></span> It> <span class="type">std::size_t</span> hash_range(It first, It last); |
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| 37 | <span class="bold"><strong>template</strong></span><<span class="bold"><strong>typename</strong></span> It> <span class="type"><span class="bold"><strong>void</strong></span></span> hash_range(std::size_t& seed, It first, It last);</pre></div> |
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| 38 | <div class="refsect1" lang="en"> |
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| 39 | <a name="id2704839"></a><h2>Description</h2> |
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| 40 | <p><b xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision"><span class="term">Effects</span></b>: |
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| 41 | |
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| 42 | For the two argument overload: |
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| 43 | <pre class="programlisting"> |
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| 44 | size_t seed = 0; |
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| 45 | |
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| 46 | for(; first != last; ++first) |
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| 47 | { |
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| 48 | <a href="hash_combine.html" title="Function template hash_combine">hash_combine</a>(seed, *first); |
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| 49 | } |
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| 50 | |
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| 51 | return seed; |
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| 52 | </pre>For the three arguments overload: |
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| 53 | <pre class="programlisting"> |
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| 54 | for(; first != last; ++first) |
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| 55 | { |
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| 56 | <a href="hash_combine.html" title="Function template hash_combine">hash_combine</a>(seed, *first); |
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| 57 | } |
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| 58 | </pre><p></p><br><b xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision"><span class="term">Notes</span></b>: |
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| 59 | |
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| 60 | <code class="computeroutput">hash_range</code> is sensitive to the order of the elements |
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| 61 | so it wouldn't be appropriate to use this with an unordered |
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| 62 | container. |
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| 63 | <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>: |
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| 64 | |
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| 65 | |
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| 66 | Only throws if <code class="computeroutput"><a href="id2510242.html" title="Function hash_value">hash_value</a>(std::iterator_traits<It>::value_type)</code> |
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| 67 | throws. <code class="computeroutput">hash_range(std::size_t&, It, It)</code> has basic exception safety as long as |
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| 68 | <code class="computeroutput"><a href="id2510242.html" title="Function hash_value">hash_value</a>(std::iterator_traits<It>::value_type)</code> |
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| 69 | has basic exception safety. |
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| 70 | </p> |
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| 74 | <td align="left"></td> |
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| 75 | <td align="right"><small>Copyright © 2005 Daniel James</small></td> |
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