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 189
 190   <div class="section" id="generating-hash-values-directly">
 191 <h1>Generating hash values directly<a class="headerlink" href="#generating-hash-values-directly" title="Permalink to this headline">¶</a></h1>
 192 <p>Hash a key value</p>
 193 <div class="section" id="synopsis">
 194 <h2>SYNOPSIS<a class="headerlink" href="#synopsis" title="Permalink to this headline">¶</a></h2>
 195 <dl class="docutils">
 196 <dt>#include &lt;libmemcached/memcached.h&gt;</dt>
 197 <dd>Compile and link with -lmemcachedutil -lmemcached</dd>
 198 </dl>
 199 <dl class="function">
 200 <dt id="_CPPv429memcached_generate_hash_valuePKc6size_t16memcached_hash_t">
 201 <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>
 202 <dd><table class="docutils field-list" frame="void" rules="none">
 203 <col class="field-name" />
 204 <col class="field-body" />
 205 <tbody valign="top">
 206 <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
 207 <li><strong>key</strong> -- the key to generate a hash of</li>
 208 <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>
 209 <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>
 210 </ul>
 211 </td>
 212 </tr>
 213 <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>
 214 </td>
 215 </tr>
 216 </tbody>
 217 </table>
 218 </dd></dl>
 219
 220 <dl class="function">
 221 <dt id="_CPPv423memcached_generate_hashP12memcached_stPKc6size_t">
 222 <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>
 223 <dd><table class="docutils field-list" frame="void" rules="none">
 224 <col class="field-name" />
 225 <col class="field-body" />
 226 <tbody valign="top">
 227 <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
 228 <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>
 229 <li><strong>key</strong> -- the key to generate a hash of</li>
 230 <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>
 231 </ul>
 232 </td>
 233 </tr>
 234 <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>
 235 </td>
 236 </tr>
 237 </tbody>
 238 </table>
 239 </dd></dl>
 240
 241 <dl class="type">
 242 <dt id="c.memcached_hash_t">
 243 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>
 244 <dd></dd></dl>
 245
 246 <dl class="enum">
 247 <dt id="_CPPv416memcached_hash_t">
 248 <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>
 249 <dd><dl class="enumerator">
 250 <dt id="_CPPv4N16memcached_hash_t22MEMCACHED_HASH_DEFAULTE">
 251 <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>
 252 <dd></dd></dl>
 253
 254 <dl class="enumerator">
 255 <dt id="_CPPv4N16memcached_hash_t18MEMCACHED_HASH_MD5E">
 256 <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>
 257 <dd></dd></dl>
 258
 259 <dl class="enumerator">
 260 <dt id="_CPPv4N16memcached_hash_t18MEMCACHED_HASH_CRCE">
 261 <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>
 262 <dd></dd></dl>
 263
 264 <dl class="enumerator">
 265 <dt id="_CPPv4N16memcached_hash_t22MEMCACHED_HASH_FNV1_64E">
 266 <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>
 267 <dd></dd></dl>
 268
 269 <dl class="enumerator">
 270 <dt id="_CPPv4N16memcached_hash_t23MEMCACHED_HASH_FNV1A_64E">
 271 <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>
 272 <dd></dd></dl>
 273
 274 <dl class="enumerator">
 275 <dt id="_CPPv4N16memcached_hash_t22MEMCACHED_HASH_FNV1_32E">
 276 <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>
 277 <dd></dd></dl>
 278
 279 <dl class="enumerator">
 280 <dt id="_CPPv4N16memcached_hash_t23MEMCACHED_HASH_FNV1A_32E">
 281 <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>
 282 <dd></dd></dl>
 283
 284 <dl class="enumerator">
 285 <dt id="_CPPv4N16memcached_hash_t20MEMCACHED_HASH_HSIEHE">
 286 <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>
 287 <dd></dd></dl>
 288
 289 <dl class="enumerator">
 290 <dt id="_CPPv4N16memcached_hash_t21MEMCACHED_HASH_MURMURE">
 291 <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>
 292 <dd></dd></dl>
 293
 294 <dl class="enumerator">
 295 <dt id="_CPPv4N16memcached_hash_t22MEMCACHED_HASH_JENKINSE">
 296 <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>
 297 <dd></dd></dl>
 298
 299 <dl class="enumerator">
 300 <dt id="_CPPv4N16memcached_hash_t22MEMCACHED_HASH_MURMUR3E">
 301 <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>
 302 <dd></dd></dl>
 303
 304 <dl class="enumerator">
 305 <dt id="_CPPv4N16memcached_hash_t21MEMCACHED_HASH_CUSTOME">
 306 <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>
 307 <dd></dd></dl>
 308
 309 </dd></dl>
 310
 311 </div>
 312 <div class="section" id="description">
 313 <h2>DESCRIPTION<a class="headerlink" href="#description" title="Permalink to this headline">¶</a></h2>
 314 <p><a class="reference internal" href="#_CPPv429memcached_generate_hash_valuePKc6size_t16memcached_hash_t" title="memcached_generate_hash_value"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">memcached_generate_hash_value()</span></code></a> allows you to hash a key using one of
 315 the hash functions defined in the library. This method is provided for
 316 the convenience of higher-level language bindings and is not necessary
 317 for normal memcache operations.</p>
 318 <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
 319 disabled by default. To enable tests for this hashing algorithm,
 320 configure and build libmemcached with the Hsieh hash enabled.</p>
 321 <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
 322 and produces the hash value that would have been generated based on the
 323 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>
 324 <p>As of version 0.36 all hash methods have been placed into the library
 325 libhashkit(3) which is linked with libmemcached(3). For more information please see its documentation.</p>
 326 </div>
 327 <div class="section" id="return-value">
 328 <h2>RETURN VALUE<a class="headerlink" href="#return-value" title="Permalink to this headline">¶</a></h2>
 329 <p>A 32-bit integer which is the result of hashing the given key.
 330 For 64-bit hash algorithms, only the least-significant 32 bits are
 331 returned.</p>
 332 </div>
 333 <div class="section" id="see-also">
 334 <h2>SEE ALSO<a class="headerlink" href="#see-also" title="Permalink to this headline">¶</a></h2>
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