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 185   <div class="section" id="update-expiration-on-a-key">
 186 <h1>Update expiration on a key<a class="headerlink" href="#update-expiration-on-a-key" title="Permalink to this headline">¶</a></h1>
 187 <div class="section" id="synopsis">
 188 <h2>SYNOPSIS<a class="headerlink" href="#synopsis" title="Permalink to this headline">¶</a></h2>
 189 <dl class="docutils">
 190 <dt>#include &lt;libmemcached/memcached.h&gt;</dt>
 191 <dd>Compile and link with -lmemcached</dd>
 192 </dl>
 193 <dl class="function">
 194 <dt id="_CPPv415memcached_touchP12memcached_stPKc6size_t6time_t">
 195 <span id="_CPPv315memcached_touchP12memcached_stPKc6size_t6time_t"></span><span id="_CPPv215memcached_touchP12memcached_stPKc6size_t6time_t"></span><span id="memcached_touch__memcached_stP.cCP.s.time_t"></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_touch</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>, time_t <em>expiration</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv415memcached_touchP12memcached_stPKc6size_t6time_t" title="Permalink to this definition">¶</a><br /></dt>
 196 <dd><table class="docutils field-list" frame="void" rules="none">
 197 <col class="field-name" />
 198 <col class="field-body" />
 199 <tbody valign="top">
 200 <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
 201 <li><strong>ptr</strong> -- pointer to 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>
 202 <li><strong>key</strong> -- the key to touch</li>
 203 <li><strong>key_length</strong> -- the length of <a class="reference internal" href="#_CPPv415memcached_touchP12memcached_stPKc6size_t6time_t" title="memcached_touch::key"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">key</span></code></a> without any terminating zero</li>
 204 <li><strong>expiration</strong> -- new expiration as a unix timestamp or as relative expiration time in seconds</li>
 205 </ul>
 206 </td>
 207 </tr>
 208 <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>
 209 </td>
 210 </tr>
 211 </tbody>
 212 </table>
 213 </dd></dl>
 214
 215 <dl class="function">
 216 <dt id="_CPPv422memcached_touch_by_keyP12memcached_stPKc6size_tPKc6size_t6time_t">
 217 <span id="_CPPv322memcached_touch_by_keyP12memcached_stPKc6size_tPKc6size_t6time_t"></span><span id="_CPPv222memcached_touch_by_keyP12memcached_stPKc6size_tPKc6size_t6time_t"></span><span id="memcached_touch_by_key__memcached_stP.cCP.s.cCP.s.time_t"></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_touch_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>, <em class="property">const</em> char *<em>group_key</em>, size_t <em>group_key_length</em>, <em class="property">const</em> char *<em>key</em>, size_t <em>key_length</em>, time_t <em>expiration</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv422memcached_touch_by_keyP12memcached_stPKc6size_tPKc6size_t6time_t" title="Permalink to this definition">¶</a><br /></dt>
 218 <dd><table class="docutils field-list" frame="void" rules="none">
 219 <col class="field-name" />
 220 <col class="field-body" />
 221 <tbody valign="top">
 222 <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
 223 <li><strong>ptr</strong> -- pointer to 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>
 224 <li><strong>group_key</strong> -- the <a class="reference internal" href="#_CPPv422memcached_touch_by_keyP12memcached_stPKc6size_tPKc6size_t6time_t" title="memcached_touch_by_key::key"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">key</span></code></a> namespace</li>
 225 <li><strong>group_key_length</strong> -- the length of <a class="reference internal" href="#_CPPv422memcached_touch_by_keyP12memcached_stPKc6size_tPKc6size_t6time_t" title="memcached_touch_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>
 226 <li><strong>key</strong> -- the key to touch</li>
 227 <li><strong>key_length</strong> -- the length of <a class="reference internal" href="#_CPPv422memcached_touch_by_keyP12memcached_stPKc6size_tPKc6size_t6time_t" title="memcached_touch_by_key::key"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">key</span></code></a> without any terminating zero</li>
 228 <li><strong>expiration</strong> -- new expiration as a unix timestamp or as relative expiration time in seconds</li>
 229 </ul>
 230 </td>
 231 </tr>
 232 <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>
 233 </td>
 234 </tr>
 235 </tbody>
 236 </table>
 237 </dd></dl>
 238
 239 </div>
 240 <div class="section" id="description">
 241 <h2>DESCRIPTION<a class="headerlink" href="#description" title="Permalink to this headline">¶</a></h2>
 242 <p><a class="reference internal" href="#_CPPv415memcached_touchP12memcached_stPKc6size_t6time_t" title="memcached_touch"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">memcached_touch()</span></code></a> is used to update the expiration time on an existing key.
 243 <a class="reference internal" href="#_CPPv422memcached_touch_by_keyP12memcached_stPKc6size_tPKc6size_t6time_t" title="memcached_touch_by_key"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">memcached_touch_by_key()</span></code></a> works the same, but it takes a master key
 244 to find the given value.</p>
 245 </div>
 246 <div class="section" id="return-value">
 247 <h2>RETURN VALUE<a class="headerlink" href="#return-value" title="Permalink to this headline">¶</a></h2>
 248 <p>A value of type <a class="reference internal" href="memcached_return_t.html#_CPPv418memcached_return_t" title="memcached_return_t"><code class="xref cpp cpp-type docutils literal notranslate"><span class="pre">memcached_return_t</span></code></a> is returned.
 249 On success that value will be <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>.
 250 Use <a class="reference internal" href="memcached_strerror.html#_CPPv418memcached_strerrorP12memcached_st18memcached_return_t" title="memcached_strerror"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">memcached_strerror()</span></code></a> to translate this value to a printable
 251 string.</p>
 252 </div>
 253 <div class="section" id="see-also">
 254 <h2>SEE ALSO<a class="headerlink" href="#see-also" title="Permalink to this headline">¶</a></h2>
 255 <ul class="simple">
 256 <li><em class="manpage"><a class="manpage reference external" href="https://linux.die.net/man/1/memcached">memcached(1)</a></em></li>
 257 <li><a class="reference internal" href="../libmemcached.html"><span class="doc">C/C++ Client Library for memcached</span></a></li>
 258 <li><a class="reference internal" href="memcached_strerror.html"><span class="doc">Converting Error Codes to Messages</span></a></li>
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