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 193   <div class="section" id="memcached-touch-memcached-touch-by-key">
 194 <h1>memcached_touch, memcached_touch_by_key<a class="headerlink" href="#memcached-touch-memcached-touch-by-key" title="Permalink to this headline">¶</a></h1>
 195 <div class="section" id="synopsis">
 196 <span id="index-0"></span><h2>SYNOPSIS<a class="headerlink" href="#synopsis" title="Permalink to this headline">¶</a></h2>
 197 <p>#include &lt;libmemcached/memcached.h&gt;</p>
 198 <dl class="cpp function">
 199 <dt id="_CPPv415memcached_touchP12memcached_stPKc6size_t6time_t">
 200 <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="sig-name 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>
 201 <dd></dd></dl>
 202
 203 <dl class="cpp function">
 204 <dt id="_CPPv422memcached_touch_by_keyP12memcached_stPKc6size_tPKc6size_t6time_t">
 205 <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="sig-name 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>
 206 <dd></dd></dl>
 207
 208 <p>Compile and link with -lmemcached</p>
 209 </div>
 210 <div class="section" id="description">
 211 <h2>DESCRIPTION<a class="headerlink" href="#description" title="Permalink to this headline">¶</a></h2>
 212 <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.
 213 <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
 214 to find the given value.</p>
 215 </div>
 216 <div class="section" id="return-value">
 217 <h2>RETURN VALUE<a class="headerlink" href="#return-value" title="Permalink to this headline">¶</a></h2>
 218 <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
 219 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>.
 220 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
 221 string.</p>
 222 </div>
 223 <div class="section" id="see-also">
 224 <h2>SEE ALSO<a class="headerlink" href="#see-also" title="Permalink to this headline">¶</a></h2>
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