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 193   <div class="section" id="determine-if-a-keys-exists">
 194 <h1>Determine if a keys exists<a class="headerlink" href="#determine-if-a-keys-exists" title="Permalink to this headline">¶</a></h1>
 195 <div class="section" id="synopsis">
 196 <h2>SYNOPSIS<a class="headerlink" href="#synopsis" title="Permalink to this headline">¶</a></h2>
 197 <dl class="docutils">
 198 <dt>#include &lt;libmemcached/memcached.h&gt;</dt>
 199 <dd>Compile and link with -lmemcached</dd>
 200 </dl>
 201 <dl class="function">
 202 <dt id="_CPPv415memcached_existP12memcached_stPcP6size_t">
 203 <span id="_CPPv315memcached_existP12memcached_stPcP6size_t"></span><span id="_CPPv215memcached_existP12memcached_stPcP6size_t"></span><span id="memcached_exist__memcached_stP.cP.sP"></span><a class="reference internal" href="memcached_return_t.html#_CPPv418memcached_return_t" title="memcached_return_t">memcached_return_t</a> <code class="descname">memcached_exist</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>, char *<em>key</em>, size_t *<em>key_length</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv415memcached_existP12memcached_stPcP6size_t" title="Permalink to this definition">¶</a><br /></dt>
 204 <dd></dd></dl>
 205
 206 <dl class="function">
 207 <dt id="_CPPv422memcached_exist_by_keyP12memcached_stPcP6size_tPcP6size_t">
 208 <span id="_CPPv322memcached_exist_by_keyP12memcached_stPcP6size_tPcP6size_t"></span><span id="_CPPv222memcached_exist_by_keyP12memcached_stPcP6size_tPcP6size_t"></span><span id="memcached_exist_by_key__memcached_stP.cP.sP.cP.sP"></span><a class="reference internal" href="memcached_return_t.html#_CPPv418memcached_return_t" title="memcached_return_t">memcached_return_t</a> <code class="descname">memcached_exist_by_key</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>, char *<em>group_key</em>, size_t *<em>group_key_length</em>, char *<em>key</em>, size_t *<em>key_length</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv422memcached_exist_by_keyP12memcached_stPcP6size_tPcP6size_t" title="Permalink to this definition">¶</a><br /></dt>
 209 <dd><table class="docutils field-list" frame="void" rules="none">
 210 <col class="field-name" />
 211 <col class="field-body" />
 212 <tbody valign="top">
 213 <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
 214 <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>
 215 <li><strong>group_key</strong> -- the key namespace</li>
 216 <li><strong>group_key_length</strong> -- length of the <a class="reference internal" href="#_CPPv422memcached_exist_by_keyP12memcached_stPcP6size_tPcP6size_t" title="memcached_exist_by_key::group_key"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">group_key</span></code></a> without any terminating zero</li>
 217 <li><strong>key</strong> -- the key to check</li>
 218 <li><strong>key_length</strong> -- length of the <a class="reference internal" href="#_CPPv422memcached_exist_by_keyP12memcached_stPcP6size_tPcP6size_t" title="memcached_exist_by_key::key"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">key</span></code></a> without any terminating zero</li>
 219 </ul>
 220 </td>
 221 </tr>
 222 <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last"><a class="reference internal" href="memcached_return_t.html#_CPPv418memcached_return_t" title="memcached_return_t"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_return_t</span></code></a> indicating success</p>
 223 </td>
 224 </tr>
 225 </tbody>
 226 </table>
 227 </dd></dl>
 228
 229 <div class="versionadded">
 230 <p><span class="versionmodified">New in version 0.53.</span></p>
 231 </div>
 232 </div>
 233 <div class="section" id="description">
 234 <h2>DESCRIPTION<a class="headerlink" href="#description" title="Permalink to this headline">¶</a></h2>
 235 <p><a class="reference internal" href="#_CPPv415memcached_existP12memcached_stPcP6size_t" title="memcached_exist"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">memcached_exist()</span></code></a> can be used to check if a key exists.</p>
 236 </div>
 237 <div class="section" id="return-value">
 238 <h2>RETURN VALUE<a class="headerlink" href="#return-value" title="Permalink to this headline">¶</a></h2>
 239 <dl class="docutils">
 240 <dt><a class="reference internal" href="memcached_return_t.html#_CPPv4N18memcached_return_t17MEMCACHED_SUCCESSE" title="MEMCACHED_SUCCESS"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">MEMCACHED_SUCCESS</span></code></a></dt>
 241 <dd>The key exists.</dd>
 242 <dt><a class="reference internal" href="memcached_return_t.html#_CPPv4N18memcached_return_t18MEMCACHED_NOTFOUNDE" title="MEMCACHED_NOTFOUND"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">MEMCACHED_NOTFOUND</span></code></a></dt>
 243 <dd>The key was not found.</dd>
 244 </dl>
 245 </div>
 246 <div class="section" id="see-also">
 247 <h2>SEE ALSO<a class="headerlink" href="#see-also" title="Permalink to this headline">¶</a></h2>
 248 <ul class="simple">
 249 <li><em class="manpage"><a class="manpage reference external" href="https://linux.die.net/man/1/memcached">memcached(1)</a></em></li>
 250 <li><a class="reference internal" href="../libmemcached.html"><span class="doc">C/C++ Client Library for memcached</span></a></li>
 251 <li><a class="reference internal" href="memcached_strerror.html"><span class="doc">Converting Error Codes to Messages</span></a></li>
 252 </ul>
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