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| 23 | <a accesskey="p" href="boost/hash.html"><img src="images/prev.png" alt="Prev"></a><a accesskey="u" href="hash/reference_.html#id2350414"><img src="images/up.png" alt="Up"></a><a accesskey="h" href="index.html"><img src="images/home.png" alt="Home"></a><a accesskey="n" href="hash_range.html"><img src="images/next.png" alt="Next"></a> |
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| 26 | <a name="hash_combine"></a><div class="titlepage"></div> |
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| 27 | <div class="refnamediv"> |
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| 28 | <h2><span class="refentrytitle">Function template hash_combine</span></h2> |
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| 29 | <p>boost::hash_combine — |
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| 30 | Called repeatedly to incrementally create a hash value from |
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| 31 | several variables. |
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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> T> <span class="type"><span class="bold"><strong>void</strong></span></span> hash_combine(size_t & seed, T <span class="bold"><strong>const</strong></span> & v);</pre></div> |
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| 37 | <div class="refsect1" lang="en"> |
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| 38 | <a name="id2704716"></a><h2>Description</h2> |
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| 39 | <p><b xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision"><span class="term">Effects</span></b>: |
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| 40 | |
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| 41 | <pre class="programlisting">seed ^= <a href="id2510242.html" title="Function hash_value">hash_value</a>(v) + 0x9e3779b9 + (seed << 6) + (seed >> 2);</pre><br><b xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision"><span class="term">Notes</span></b>: |
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| 42 | |
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| 43 | <a href="id2510242.html" title="Function hash_value">hash_value</a> is called without |
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| 44 | qualification, so that overloads can be found via ADL.<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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| 45 | |
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| 46 | |
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| 47 | Only throws if <a href="id2510242.html" title="Function hash_value">hash_value</a>(T) throws. |
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| 48 | Strong exception safety, as long as <a href="id2510242.html" title="Function hash_value">hash_value</a>(T) |
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| 49 | also has strong exception safety. |
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| 50 | </p> |
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| 55 | <td align="right"><small>Copyright © 2005 Daniel James</small></td> |
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