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+ <title>Generating hash values directly — libmemcached 1.1.0 documentation</title>
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+ <ul class="current">
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+<li class="toctree-l4"><a class="reference internal" href="memcached_set_encoding_key.html">Set encryption key</a></li>
+<li class="toctree-l4 current"><a class="current reference internal" href="#">Generating hash values directly</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="../libhashkit/hashkit_value.html">Generate hash value</a></li>
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<div class="section" id="generating-hash-values-directly">
<h1>Generating hash values directly<a class="headerlink" href="#generating-hash-values-directly" title="Permalink to this headline">¶</a></h1>
-<p id="index-0">Hash a key value</p>
+<p>Hash a key value</p>
<div class="section" id="synopsis">
<h2>SYNOPSIS<a class="headerlink" href="#synopsis" title="Permalink to this headline">¶</a></h2>
-<p>#include <libmemcached/memcached.h></p>
-<dl class="type">
-<dt id="_CPPv416memcached_hash_t">
-<span id="_CPPv316memcached_hash_t"></span><span id="_CPPv216memcached_hash_t"></span><span id="memcached_hash_t"></span><em class="property">type </em><code class="sig-name descname">memcached_hash_t</code><a class="headerlink" href="#_CPPv416memcached_hash_t" title="Permalink to this definition">¶</a><br /></dt>
-<dd></dd></dl>
-
+<dl class="docutils">
+<dt>#include <libmemcached/memcached.h></dt>
+<dd>Compile and link with -lmemcachedutil -lmemcached</dd>
+</dl>
<dl class="function">
<dt id="_CPPv429memcached_generate_hash_valuePKc6size_t16memcached_hash_t">
-<span id="_CPPv329memcached_generate_hash_valuePKc6size_t16memcached_hash_t"></span><span id="_CPPv229memcached_generate_hash_valuePKc6size_t16memcached_hash_t"></span><span id="memcached_generate_hash_value__cCP.s.memcached_hash_t"></span>uint32_t <code class="sig-name descname">memcached_generate_hash_value</code><span class="sig-paren">(</span><em class="property">const</em> char *<em>key</em>, size_t <em>key_length</em>, <a class="reference internal" href="#_CPPv416memcached_hash_t" title="memcached_hash_t">memcached_hash_t</a> <em>hash_algorithm</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv429memcached_generate_hash_valuePKc6size_t16memcached_hash_t" title="Permalink to this definition">¶</a><br /></dt>
-<dd></dd></dl>
+<span id="_CPPv329memcached_generate_hash_valuePKc6size_t16memcached_hash_t"></span><span id="_CPPv229memcached_generate_hash_valuePKc6size_t16memcached_hash_t"></span><span id="memcached_generate_hash_value__cCP.s.memcached_hash_t"></span>uint32_t <code class="descname">memcached_generate_hash_value</code><span class="sig-paren">(</span><em class="property">const</em> char *<em>key</em>, size_t <em>key_length</em>, <a class="reference internal" href="#_CPPv416memcached_hash_t" title="memcached_hash_t">memcached_hash_t</a> <em>hash_algorithm</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv429memcached_generate_hash_valuePKc6size_t16memcached_hash_t" title="Permalink to this definition">¶</a><br /></dt>
+<dd><table class="docutils field-list" frame="void" rules="none">
+<col class="field-name" />
+<col class="field-body" />
+<tbody valign="top">
+<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
+<li><strong>key</strong> -- the key to generate a hash of</li>
+<li><strong>key_length</strong> -- the length of the <a class="reference internal" href="#_CPPv429memcached_generate_hash_valuePKc6size_t16memcached_hash_t" title="memcached_generate_hash_value::key"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">key</span></code></a> without any terminating zero</li>
+<li><strong>hash_algorithm</strong> -- <a class="reference internal" href="#_CPPv416memcached_hash_t" title="memcached_hash_t"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_hash_t</span></code></a>, the algorithm to use</li>
+</ul>
+</td>
+</tr>
+<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last">a 32 bit hash value</p>
+</td>
+</tr>
+</tbody>
+</table>
+</dd></dl>
<dl class="function">
<dt id="_CPPv423memcached_generate_hashP12memcached_stPKc6size_t">
-<span id="_CPPv323memcached_generate_hashP12memcached_stPKc6size_t"></span><span id="_CPPv223memcached_generate_hashP12memcached_stPKc6size_t"></span><span id="memcached_generate_hash__memcached_stP.cCP.s"></span>uint32_t <code class="sig-name descname">memcached_generate_hash</code><span class="sig-paren">(</span><a class="reference internal" href="memcached_create.html#_CPPv412memcached_st" title="memcached_st">memcached_st</a> *<em>ptr</em>, <em class="property">const</em> char *<em>key</em>, size_t <em>key_length</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv423memcached_generate_hashP12memcached_stPKc6size_t" title="Permalink to this definition">¶</a><br /></dt>
-<dd></dd></dl>
+<span id="_CPPv323memcached_generate_hashP12memcached_stPKc6size_t"></span><span id="_CPPv223memcached_generate_hashP12memcached_stPKc6size_t"></span><span id="memcached_generate_hash__memcached_stP.cCP.s"></span>uint32_t <code class="descname">memcached_generate_hash</code><span class="sig-paren">(</span><a class="reference internal" href="memcached_create.html#_CPPv412memcached_st" title="memcached_st">memcached_st</a> *<em>ptr</em>, <em class="property">const</em> char *<em>key</em>, size_t <em>key_length</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv423memcached_generate_hashP12memcached_stPKc6size_t" title="Permalink to this definition">¶</a><br /></dt>
+<dd><table class="docutils field-list" frame="void" rules="none">
+<col class="field-name" />
+<col class="field-body" />
+<tbody valign="top">
+<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
+<li><strong>ptr</strong> -- pointer to an initialized <a class="reference internal" href="memcached_create.html#_CPPv412memcached_st" title="memcached_st"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_st</span></code></a> struct</li>
+<li><strong>key</strong> -- the key to generate a hash of</li>
+<li><strong>key_length</strong> -- the length of the <a class="reference internal" href="#_CPPv423memcached_generate_hashP12memcached_stPKc6size_t" title="memcached_generate_hash::key"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">key</span></code></a> without any terminating zero</li>
+</ul>
+</td>
+</tr>
+<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last">a 32 bit hash value</p>
+</td>
+</tr>
+</tbody>
+</table>
+</dd></dl>
<dl class="type">
-<dt id="_CPPv422MEMCACHED_HASH_DEFAULT">
-<span id="_CPPv322MEMCACHED_HASH_DEFAULT"></span><span id="_CPPv222MEMCACHED_HASH_DEFAULT"></span><span id="MEMCACHED_HASH_DEFAULT"></span><em class="property">type </em><code class="sig-name descname">MEMCACHED_HASH_DEFAULT</code><a class="headerlink" href="#_CPPv422MEMCACHED_HASH_DEFAULT" title="Permalink to this definition">¶</a><br /></dt>
+<dt id="c.memcached_hash_t">
+enum <a class="reference internal" href="#c.memcached_hash_t" title="memcached_hash_t">memcached_hash_t</a> <code class="descname">memcached_hash_t</code><a class="headerlink" href="#c.memcached_hash_t" title="Permalink to this definition">¶</a></dt>
<dd></dd></dl>
-<dl class="type">
-<dt id="_CPPv418MEMCACHED_HASH_MD5">
-<span id="_CPPv318MEMCACHED_HASH_MD5"></span><span id="_CPPv218MEMCACHED_HASH_MD5"></span><span id="MEMCACHED_HASH_MD5"></span><em class="property">type </em><code class="sig-name descname">MEMCACHED_HASH_MD5</code><a class="headerlink" href="#_CPPv418MEMCACHED_HASH_MD5" title="Permalink to this definition">¶</a><br /></dt>
+<dl class="enum">
+<dt id="_CPPv416memcached_hash_t">
+<span id="_CPPv316memcached_hash_t"></span><span id="_CPPv216memcached_hash_t"></span><em class="property">enum </em><code class="descname">memcached_hash_t</code><a class="headerlink" href="#_CPPv416memcached_hash_t" title="Permalink to this definition">¶</a><br /></dt>
+<dd><dl class="enumerator">
+<dt id="_CPPv4N16memcached_hash_t22MEMCACHED_HASH_DEFAULTE">
+<span id="_CPPv3N16memcached_hash_t22MEMCACHED_HASH_DEFAULTE"></span><span id="_CPPv2N16memcached_hash_t22MEMCACHED_HASH_DEFAULTE"></span><em class="property">enumerator </em><code class="descname">MEMCACHED_HASH_DEFAULT</code><a class="headerlink" href="#_CPPv4N16memcached_hash_t22MEMCACHED_HASH_DEFAULTE" title="Permalink to this definition">¶</a><br /></dt>
<dd></dd></dl>
-<dl class="type">
-<dt id="_CPPv418MEMCACHED_HASH_CRC">
-<span id="_CPPv318MEMCACHED_HASH_CRC"></span><span id="_CPPv218MEMCACHED_HASH_CRC"></span><span id="MEMCACHED_HASH_CRC"></span><em class="property">type </em><code class="sig-name descname">MEMCACHED_HASH_CRC</code><a class="headerlink" href="#_CPPv418MEMCACHED_HASH_CRC" title="Permalink to this definition">¶</a><br /></dt>
+<dl class="enumerator">
+<dt id="_CPPv4N16memcached_hash_t18MEMCACHED_HASH_MD5E">
+<span id="_CPPv3N16memcached_hash_t18MEMCACHED_HASH_MD5E"></span><span id="_CPPv2N16memcached_hash_t18MEMCACHED_HASH_MD5E"></span><em class="property">enumerator </em><code class="descname">MEMCACHED_HASH_MD5</code><a class="headerlink" href="#_CPPv4N16memcached_hash_t18MEMCACHED_HASH_MD5E" title="Permalink to this definition">¶</a><br /></dt>
<dd></dd></dl>
-<dl class="type">
-<dt id="_CPPv422MEMCACHED_HASH_FNV1_64">
-<span id="_CPPv322MEMCACHED_HASH_FNV1_64"></span><span id="_CPPv222MEMCACHED_HASH_FNV1_64"></span><span id="MEMCACHED_HASH_FNV1_64"></span><em class="property">type </em><code class="sig-name descname">MEMCACHED_HASH_FNV1_64</code><a class="headerlink" href="#_CPPv422MEMCACHED_HASH_FNV1_64" title="Permalink to this definition">¶</a><br /></dt>
+<dl class="enumerator">
+<dt id="_CPPv4N16memcached_hash_t18MEMCACHED_HASH_CRCE">
+<span id="_CPPv3N16memcached_hash_t18MEMCACHED_HASH_CRCE"></span><span id="_CPPv2N16memcached_hash_t18MEMCACHED_HASH_CRCE"></span><em class="property">enumerator </em><code class="descname">MEMCACHED_HASH_CRC</code><a class="headerlink" href="#_CPPv4N16memcached_hash_t18MEMCACHED_HASH_CRCE" title="Permalink to this definition">¶</a><br /></dt>
<dd></dd></dl>
-<dl class="type">
-<dt id="_CPPv423MEMCACHED_HASH_FNV1A_64">
-<span id="_CPPv323MEMCACHED_HASH_FNV1A_64"></span><span id="_CPPv223MEMCACHED_HASH_FNV1A_64"></span><span id="MEMCACHED_HASH_FNV1A_64"></span><em class="property">type </em><code class="sig-name descname">MEMCACHED_HASH_FNV1A_64</code><a class="headerlink" href="#_CPPv423MEMCACHED_HASH_FNV1A_64" title="Permalink to this definition">¶</a><br /></dt>
+<dl class="enumerator">
+<dt id="_CPPv4N16memcached_hash_t22MEMCACHED_HASH_FNV1_64E">
+<span id="_CPPv3N16memcached_hash_t22MEMCACHED_HASH_FNV1_64E"></span><span id="_CPPv2N16memcached_hash_t22MEMCACHED_HASH_FNV1_64E"></span><em class="property">enumerator </em><code class="descname">MEMCACHED_HASH_FNV1_64</code><a class="headerlink" href="#_CPPv4N16memcached_hash_t22MEMCACHED_HASH_FNV1_64E" title="Permalink to this definition">¶</a><br /></dt>
<dd></dd></dl>
-<dl class="type">
-<dt id="_CPPv422MEMCACHED_HASH_FNV1_32">
-<span id="_CPPv322MEMCACHED_HASH_FNV1_32"></span><span id="_CPPv222MEMCACHED_HASH_FNV1_32"></span><span id="MEMCACHED_HASH_FNV1_32"></span><em class="property">type </em><code class="sig-name descname">MEMCACHED_HASH_FNV1_32</code><a class="headerlink" href="#_CPPv422MEMCACHED_HASH_FNV1_32" title="Permalink to this definition">¶</a><br /></dt>
+<dl class="enumerator">
+<dt id="_CPPv4N16memcached_hash_t23MEMCACHED_HASH_FNV1A_64E">
+<span id="_CPPv3N16memcached_hash_t23MEMCACHED_HASH_FNV1A_64E"></span><span id="_CPPv2N16memcached_hash_t23MEMCACHED_HASH_FNV1A_64E"></span><em class="property">enumerator </em><code class="descname">MEMCACHED_HASH_FNV1A_64</code><a class="headerlink" href="#_CPPv4N16memcached_hash_t23MEMCACHED_HASH_FNV1A_64E" title="Permalink to this definition">¶</a><br /></dt>
<dd></dd></dl>
-<dl class="type">
-<dt id="_CPPv423MEMCACHED_HASH_FNV1A_32">
-<span id="_CPPv323MEMCACHED_HASH_FNV1A_32"></span><span id="_CPPv223MEMCACHED_HASH_FNV1A_32"></span><span id="MEMCACHED_HASH_FNV1A_32"></span><em class="property">type </em><code class="sig-name descname">MEMCACHED_HASH_FNV1A_32</code><a class="headerlink" href="#_CPPv423MEMCACHED_HASH_FNV1A_32" title="Permalink to this definition">¶</a><br /></dt>
+<dl class="enumerator">
+<dt id="_CPPv4N16memcached_hash_t22MEMCACHED_HASH_FNV1_32E">
+<span id="_CPPv3N16memcached_hash_t22MEMCACHED_HASH_FNV1_32E"></span><span id="_CPPv2N16memcached_hash_t22MEMCACHED_HASH_FNV1_32E"></span><em class="property">enumerator </em><code class="descname">MEMCACHED_HASH_FNV1_32</code><a class="headerlink" href="#_CPPv4N16memcached_hash_t22MEMCACHED_HASH_FNV1_32E" title="Permalink to this definition">¶</a><br /></dt>
<dd></dd></dl>
-<dl class="type">
-<dt id="_CPPv422MEMCACHED_HASH_JENKINS">
-<span id="_CPPv322MEMCACHED_HASH_JENKINS"></span><span id="_CPPv222MEMCACHED_HASH_JENKINS"></span><span id="MEMCACHED_HASH_JENKINS"></span><em class="property">type </em><code class="sig-name descname">MEMCACHED_HASH_JENKINS</code><a class="headerlink" href="#_CPPv422MEMCACHED_HASH_JENKINS" title="Permalink to this definition">¶</a><br /></dt>
+<dl class="enumerator">
+<dt id="_CPPv4N16memcached_hash_t23MEMCACHED_HASH_FNV1A_32E">
+<span id="_CPPv3N16memcached_hash_t23MEMCACHED_HASH_FNV1A_32E"></span><span id="_CPPv2N16memcached_hash_t23MEMCACHED_HASH_FNV1A_32E"></span><em class="property">enumerator </em><code class="descname">MEMCACHED_HASH_FNV1A_32</code><a class="headerlink" href="#_CPPv4N16memcached_hash_t23MEMCACHED_HASH_FNV1A_32E" title="Permalink to this definition">¶</a><br /></dt>
<dd></dd></dl>
-<dl class="type">
-<dt id="_CPPv421MEMCACHED_HASH_MURMUR">
-<span id="_CPPv321MEMCACHED_HASH_MURMUR"></span><span id="_CPPv221MEMCACHED_HASH_MURMUR"></span><span id="MEMCACHED_HASH_MURMUR"></span><em class="property">type </em><code class="sig-name descname">MEMCACHED_HASH_MURMUR</code><a class="headerlink" href="#_CPPv421MEMCACHED_HASH_MURMUR" title="Permalink to this definition">¶</a><br /></dt>
+<dl class="enumerator">
+<dt id="_CPPv4N16memcached_hash_t20MEMCACHED_HASH_HSIEHE">
+<span id="_CPPv3N16memcached_hash_t20MEMCACHED_HASH_HSIEHE"></span><span id="_CPPv2N16memcached_hash_t20MEMCACHED_HASH_HSIEHE"></span><em class="property">enumerator </em><code class="descname">MEMCACHED_HASH_HSIEH</code><a class="headerlink" href="#_CPPv4N16memcached_hash_t20MEMCACHED_HASH_HSIEHE" title="Permalink to this definition">¶</a><br /></dt>
<dd></dd></dl>
-<dl class="type">
-<dt id="_CPPv420MEMCACHED_HASH_HSIEH">
-<span id="_CPPv320MEMCACHED_HASH_HSIEH"></span><span id="_CPPv220MEMCACHED_HASH_HSIEH"></span><span id="MEMCACHED_HASH_HSIEH"></span><em class="property">type </em><code class="sig-name descname">MEMCACHED_HASH_HSIEH</code><a class="headerlink" href="#_CPPv420MEMCACHED_HASH_HSIEH" title="Permalink to this definition">¶</a><br /></dt>
+<dl class="enumerator">
+<dt id="_CPPv4N16memcached_hash_t21MEMCACHED_HASH_MURMURE">
+<span id="_CPPv3N16memcached_hash_t21MEMCACHED_HASH_MURMURE"></span><span id="_CPPv2N16memcached_hash_t21MEMCACHED_HASH_MURMURE"></span><em class="property">enumerator </em><code class="descname">MEMCACHED_HASH_MURMUR</code><a class="headerlink" href="#_CPPv4N16memcached_hash_t21MEMCACHED_HASH_MURMURE" title="Permalink to this definition">¶</a><br /></dt>
<dd></dd></dl>
-<dl class="type">
-<dt id="_CPPv422MEMCACHED_HASH_MURMUR3">
-<span id="_CPPv322MEMCACHED_HASH_MURMUR3"></span><span id="_CPPv222MEMCACHED_HASH_MURMUR3"></span><span id="MEMCACHED_HASH_MURMUR3"></span><em class="property">type </em><code class="sig-name descname">MEMCACHED_HASH_MURMUR3</code><a class="headerlink" href="#_CPPv422MEMCACHED_HASH_MURMUR3" title="Permalink to this definition">¶</a><br /></dt>
+<dl class="enumerator">
+<dt id="_CPPv4N16memcached_hash_t22MEMCACHED_HASH_JENKINSE">
+<span id="_CPPv3N16memcached_hash_t22MEMCACHED_HASH_JENKINSE"></span><span id="_CPPv2N16memcached_hash_t22MEMCACHED_HASH_JENKINSE"></span><em class="property">enumerator </em><code class="descname">MEMCACHED_HASH_JENKINS</code><a class="headerlink" href="#_CPPv4N16memcached_hash_t22MEMCACHED_HASH_JENKINSE" title="Permalink to this definition">¶</a><br /></dt>
<dd></dd></dl>
-<p>Compile and link with -lmemcachedutil -lmemcached</p>
+<dl class="enumerator">
+<dt id="_CPPv4N16memcached_hash_t22MEMCACHED_HASH_MURMUR3E">
+<span id="_CPPv3N16memcached_hash_t22MEMCACHED_HASH_MURMUR3E"></span><span id="_CPPv2N16memcached_hash_t22MEMCACHED_HASH_MURMUR3E"></span><em class="property">enumerator </em><code class="descname">MEMCACHED_HASH_MURMUR3</code><a class="headerlink" href="#_CPPv4N16memcached_hash_t22MEMCACHED_HASH_MURMUR3E" title="Permalink to this definition">¶</a><br /></dt>
+<dd></dd></dl>
+
+<dl class="enumerator">
+<dt id="_CPPv4N16memcached_hash_t21MEMCACHED_HASH_CUSTOME">
+<span id="_CPPv3N16memcached_hash_t21MEMCACHED_HASH_CUSTOME"></span><span id="_CPPv2N16memcached_hash_t21MEMCACHED_HASH_CUSTOME"></span><em class="property">enumerator </em><code class="descname">MEMCACHED_HASH_CUSTOM</code><a class="headerlink" href="#_CPPv4N16memcached_hash_t21MEMCACHED_HASH_CUSTOME" title="Permalink to this definition">¶</a><br /></dt>
+<dd></dd></dl>
+
+</dd></dl>
+
</div>
<div class="section" id="description">
<h2>DESCRIPTION<a class="headerlink" href="#description" title="Permalink to this headline">¶</a></h2>
the hash functions defined in the library. This method is provided for
the convenience of higher-level language bindings and is not necessary
for normal memcache operations.</p>
-<p>The allowed hash algorithm constants are listed in the manpage for
-<a class="reference internal" href="memcached_behavior.html#_CPPv422memcached_behavior_setP12memcached_st20memcached_behavior_t8uint64_t" title="memcached_behavior_set"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">memcached_behavior_set()</span></code></a>.</p>
+<p>Support for <a class="reference internal" href="#_CPPv4N16memcached_hash_t20MEMCACHED_HASH_HSIEHE" title="MEMCACHED_HASH_HSIEH"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">MEMCACHED_HASH_HSIEH</span></code></a> is a compile time option that is
+disabled by default. To enable tests for this hashing algorithm,
+configure and build libmemcached with the Hsieh hash enabled.</p>
<p><a class="reference internal" href="#_CPPv423memcached_generate_hashP12memcached_stPKc6size_t" title="memcached_generate_hash"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">memcached_generate_hash()</span></code></a> takes a <a class="reference internal" href="memcached_create.html#_CPPv412memcached_st" title="memcached_st"><code class="xref cpp cpp-type docutils literal notranslate"><span class="pre">memcached_st</span></code></a> structure
and produces the hash value that would have been generated based on the
defaults of <a class="reference internal" href="memcached_create.html#_CPPv412memcached_st" title="memcached_st"><code class="xref cpp cpp-type docutils literal notranslate"><span class="pre">memcached_st</span></code></a>.</p>
<p>As of version 0.36 all hash methods have been placed into the library
libhashkit(3) which is linked with libmemcached(3). For more information please see its documentation.</p>
</div>
-<div class="section" id="return">
-<h2>RETURN<a class="headerlink" href="#return" title="Permalink to this headline">¶</a></h2>
+<div class="section" id="return-value">
+<h2>RETURN VALUE<a class="headerlink" href="#return-value" title="Permalink to this headline">¶</a></h2>
<p>A 32-bit integer which is the result of hashing the given key.
For 64-bit hash algorithms, only the least-significant 32 bits are
returned.</p>
projects / m6w6 / libmemcached / blobdiff