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 193   <div class="section" id="update-expiration-on-a-key">
 194 <h1>Update expiration on a key<a class="headerlink" href="#update-expiration-on-a-key" 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_touchP12memcached_stPKc6size_t6time_t">
 203 <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>
 204 <dd><table class="docutils field-list" frame="void" rules="none">
 205 <col class="field-name" />
 206 <col class="field-body" />
 207 <tbody valign="top">
 208 <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
 209 <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>
 210 <li><strong>key</strong> -- the key to touch</li>
 211 <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>
 212 <li><strong>expiration</strong> -- new expiration as a unix timestamp or as relative expiration time in seconds</li>
 213 </ul>
 214 </td>
 215 </tr>
 216 <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>
 217 </td>
 218 </tr>
 219 </tbody>
 220 </table>
 221 </dd></dl>
 222
 223 <dl class="function">
 224 <dt id="_CPPv422memcached_touch_by_keyP12memcached_stPKc6size_tPKc6size_t6time_t">
 225 <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>
 226 <dd><table class="docutils field-list" frame="void" rules="none">
 227 <col class="field-name" />
 228 <col class="field-body" />
 229 <tbody valign="top">
 230 <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
 231 <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>
 232 <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>
 233 <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>
 234 <li><strong>key</strong> -- the key to touch</li>
 235 <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>
 236 <li><strong>expiration</strong> -- new expiration as a unix timestamp or as relative expiration time in seconds</li>
 237 </ul>
 238 </td>
 239 </tr>
 240 <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>
 241 </td>
 242 </tr>
 243 </tbody>
 244 </table>
 245 </dd></dl>
 246
 247 </div>
 248 <div class="section" id="description">
 249 <h2>DESCRIPTION<a class="headerlink" href="#description" title="Permalink to this headline">¶</a></h2>
 250 <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.
 251 <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
 252 to find the given value.</p>
 253 </div>
 254 <div class="section" id="return-value">
 255 <h2>RETURN VALUE<a class="headerlink" href="#return-value" title="Permalink to this headline">¶</a></h2>
 256 <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.
 257 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>.
 258 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
 259 string.</p>
 260 </div>
 261 <div class="section" id="see-also">
 262 <h2>SEE ALSO<a class="headerlink" href="#see-also" title="Permalink to this headline">¶</a></h2>
 263 <ul class="simple">
 264 <li><em class="manpage"><a class="manpage reference external" href="https://linux.die.net/man/1/memcached">memcached(1)</a></em></li>
 265 <li><a class="reference internal" href="../libmemcached.html"><span class="doc">C/C++ Client Library for memcached</span></a></li>
 266 <li><a class="reference internal" href="memcached_strerror.html"><span class="doc">Converting Error Codes to Messages</span></a></li>
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