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 192
 193   <div class="section" id="working-with-result-sets">
 194 <h1>Working with result sets<a class="headerlink" href="#working-with-result-sets" 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 <p>#include &lt;libmemcached/memcached_pool.h&gt;</p>
 198 <dl class="cpp type">
 199 <dt id="_CPPv419memcached_result_st">
 200 <span id="_CPPv319memcached_result_st"></span><span id="_CPPv219memcached_result_st"></span><span id="memcached_result_st"></span><em class="property">type </em><code class="sig-name descname">memcached_result_st</code><a class="headerlink" href="#_CPPv419memcached_result_st" title="Permalink to this definition">¶</a><br /></dt>
 201 <dd></dd></dl>
 202
 203 <dl class="cpp function">
 204 <dt id="_CPPv423memcached_result_createP12memcached_stP19memcached_result_st">
 205 <span id="_CPPv323memcached_result_createP12memcached_stP19memcached_result_st"></span><span id="_CPPv223memcached_result_createP12memcached_stP19memcached_result_st"></span><span id="memcached_result_create__memcached_stP.memcached_result_stP"></span><a class="reference internal" href="#_CPPv419memcached_result_st" title="memcached_result_st">memcached_result_st</a> *<code class="sig-name descname">memcached_result_create</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>, <a class="reference internal" href="#_CPPv419memcached_result_st" title="memcached_result_st">memcached_result_st</a> *<em>result</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv423memcached_result_createP12memcached_stP19memcached_result_st" title="Permalink to this definition">¶</a><br /></dt>
 206 <dd></dd></dl>
 207
 208 <dl class="cpp function">
 209 <dt id="_CPPv421memcached_result_freeP19memcached_result_st">
 210 <span id="_CPPv321memcached_result_freeP19memcached_result_st"></span><span id="_CPPv221memcached_result_freeP19memcached_result_st"></span><span id="memcached_result_free__memcached_result_stP"></span>void <code class="sig-name descname">memcached_result_free</code><span class="sig-paren">(</span><a class="reference internal" href="#_CPPv419memcached_result_st" title="memcached_result_st">memcached_result_st</a> *<em>result</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv421memcached_result_freeP19memcached_result_st" title="Permalink to this definition">¶</a><br /></dt>
 211 <dd></dd></dl>
 212
 213 <dl class="cpp function">
 214 <dt id="_CPPv426memcached_result_key_valueP19memcached_result_st">
 215 <span id="_CPPv326memcached_result_key_valueP19memcached_result_st"></span><span id="_CPPv226memcached_result_key_valueP19memcached_result_st"></span><span id="memcached_result_key_value__memcached_result_stP"></span><em class="property">const</em> char *<code class="sig-name descname">memcached_result_key_value</code><span class="sig-paren">(</span><a class="reference internal" href="#_CPPv419memcached_result_st" title="memcached_result_st">memcached_result_st</a> *<em>result</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv426memcached_result_key_valueP19memcached_result_st" title="Permalink to this definition">¶</a><br /></dt>
 216 <dd></dd></dl>
 217
 218 <dl class="cpp function">
 219 <dt id="_CPPv427memcached_result_key_lengthPK19memcached_result_st">
 220 <span id="_CPPv327memcached_result_key_lengthPK19memcached_result_st"></span><span id="_CPPv227memcached_result_key_lengthPK19memcached_result_st"></span><span id="memcached_result_key_length__memcached_result_stCP"></span>size_t <code class="sig-name descname">memcached_result_key_length</code><span class="sig-paren">(</span><em class="property">const</em> <a class="reference internal" href="#_CPPv419memcached_result_st" title="memcached_result_st">memcached_result_st</a> *<em>result</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv427memcached_result_key_lengthPK19memcached_result_st" title="Permalink to this definition">¶</a><br /></dt>
 221 <dd></dd></dl>
 222
 223 <dl class="cpp function">
 224 <dt id="_CPPv422memcached_result_valueP19memcached_result_st">
 225 <span id="_CPPv322memcached_result_valueP19memcached_result_st"></span><span id="_CPPv222memcached_result_valueP19memcached_result_st"></span><span id="memcached_result_value__memcached_result_stP"></span><em class="property">const</em> char *<code class="sig-name descname">memcached_result_value</code><span class="sig-paren">(</span><a class="reference internal" href="#_CPPv419memcached_result_st" title="memcached_result_st">memcached_result_st</a> *<em>ptr</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv422memcached_result_valueP19memcached_result_st" title="Permalink to this definition">¶</a><br /></dt>
 226 <dd></dd></dl>
 227
 228 <dl class="cpp function">
 229 <dt id="_CPPv427memcached_result_take_valueP19memcached_result_st">
 230 <span id="_CPPv327memcached_result_take_valueP19memcached_result_st"></span><span id="_CPPv227memcached_result_take_valueP19memcached_result_st"></span><span id="memcached_result_take_value__memcached_result_stP"></span>char *<code class="sig-name descname">memcached_result_take_value</code><span class="sig-paren">(</span><a class="reference internal" href="#_CPPv419memcached_result_st" title="memcached_result_st">memcached_result_st</a> *<em>ptr</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv427memcached_result_take_valueP19memcached_result_st" title="Permalink to this definition">¶</a><br /></dt>
 231 <dd></dd></dl>
 232
 233 <dl class="cpp function">
 234 <dt id="_CPPv423memcached_result_lengthPK19memcached_result_st">
 235 <span id="_CPPv323memcached_result_lengthPK19memcached_result_st"></span><span id="_CPPv223memcached_result_lengthPK19memcached_result_st"></span><span id="memcached_result_length__memcached_result_stCP"></span>size_t <code class="sig-name descname">memcached_result_length</code><span class="sig-paren">(</span><em class="property">const</em> <a class="reference internal" href="#_CPPv419memcached_result_st" title="memcached_result_st">memcached_result_st</a> *<em>ptr</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv423memcached_result_lengthPK19memcached_result_st" title="Permalink to this definition">¶</a><br /></dt>
 236 <dd></dd></dl>
 237
 238 <dl class="cpp function">
 239 <dt id="_CPPv422memcached_result_flagsPK19memcached_result_st">
 240 <span id="_CPPv322memcached_result_flagsPK19memcached_result_st"></span><span id="_CPPv222memcached_result_flagsPK19memcached_result_st"></span><span id="memcached_result_flags__memcached_result_stCP"></span>uint32_t <code class="sig-name descname">memcached_result_flags</code><span class="sig-paren">(</span><em class="property">const</em> <a class="reference internal" href="#_CPPv419memcached_result_st" title="memcached_result_st">memcached_result_st</a> *<em>result</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv422memcached_result_flagsPK19memcached_result_st" title="Permalink to this definition">¶</a><br /></dt>
 241 <dd></dd></dl>
 242
 243 <dl class="cpp function">
 244 <dt id="_CPPv420memcached_result_casPK19memcached_result_st">
 245 <span id="_CPPv320memcached_result_casPK19memcached_result_st"></span><span id="_CPPv220memcached_result_casPK19memcached_result_st"></span><span id="memcached_result_cas__memcached_result_stCP"></span>uint64_t <code class="sig-name descname">memcached_result_cas</code><span class="sig-paren">(</span><em class="property">const</em> <a class="reference internal" href="#_CPPv419memcached_result_st" title="memcached_result_st">memcached_result_st</a> *<em>result</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv420memcached_result_casPK19memcached_result_st" title="Permalink to this definition">¶</a><br /></dt>
 246 <dd></dd></dl>
 247
 248 <dl class="cpp function">
 249 <dt id="_CPPv426memcached_result_set_valueP19memcached_result_stPKc6size_t">
 250 <span id="_CPPv326memcached_result_set_valueP19memcached_result_stPKc6size_t"></span><span id="_CPPv226memcached_result_set_valueP19memcached_result_stPKc6size_t"></span><span id="memcached_result_set_value__memcached_result_stP.cCP.s"></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_result_set_value</code><span class="sig-paren">(</span><a class="reference internal" href="#_CPPv419memcached_result_st" title="memcached_result_st">memcached_result_st</a> *<em>ptr</em>, <em class="property">const</em> char *<em>value</em>, size_t <em>length</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv426memcached_result_set_valueP19memcached_result_stPKc6size_t" title="Permalink to this definition">¶</a><br /></dt>
 251 <dd></dd></dl>
 252
 253 <dl class="cpp function">
 254 <dt id="_CPPv426memcached_result_set_flagsP19memcached_result_st8uint32_t">
 255 <span id="_CPPv326memcached_result_set_flagsP19memcached_result_st8uint32_t"></span><span id="_CPPv226memcached_result_set_flagsP19memcached_result_st8uint32_t"></span><span id="memcached_result_set_flags__memcached_result_stP.uint32_t"></span>void <code class="sig-name descname">memcached_result_set_flags</code><span class="sig-paren">(</span><a class="reference internal" href="#_CPPv419memcached_result_st" title="memcached_result_st">memcached_result_st</a> *<em>ptr</em>, uint32_t <em>flags</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv426memcached_result_set_flagsP19memcached_result_st8uint32_t" title="Permalink to this definition">¶</a><br /></dt>
 256 <dd></dd></dl>
 257
 258 <dl class="cpp function">
 259 <dt id="_CPPv431memcached_result_set_expirationP19memcached_result_st6time_t">
 260 <span id="_CPPv331memcached_result_set_expirationP19memcached_result_st6time_t"></span><span id="_CPPv231memcached_result_set_expirationP19memcached_result_st6time_t"></span><span id="memcached_result_set_expiration__memcached_result_stP.time_t"></span>void <code class="sig-name descname">memcached_result_set_expiration</code><span class="sig-paren">(</span><a class="reference internal" href="#_CPPv419memcached_result_st" title="memcached_result_st">memcached_result_st</a> *<em>ptr</em>, time_t<span class="sig-paren">)</span><a class="headerlink" href="#_CPPv431memcached_result_set_expirationP19memcached_result_st6time_t" title="Permalink to this definition">¶</a><br /></dt>
 261 <dd></dd></dl>
 262
 263 <p>Compile and link with -lmemcachedutil -lmemcached</p>
 264 </div>
 265 <div class="section" id="description">
 266 <h2>DESCRIPTION<a class="headerlink" href="#description" title="Permalink to this headline">¶</a></h2>
 267 <p>libmemcached(3) can optionally return a <a class="reference internal" href="#_CPPv419memcached_result_st" title="memcached_result_st"><code class="xref cpp cpp-type docutils literal notranslate"><span class="pre">memcached_result_st</span></code></a> which
 268 acts as a result object. The result objects have added benefits over the
 269 character pointer returns, in that they are forward compatible with new
 270 return items that future memcached servers may implement (the best current
 271 example of this is the CAS return item). The structures can also be reused,
 272 which will save on calls to malloc(3). It is suggested that you use result
 273 objects over char * return functions.</p>
 274 <p>The structure of <a class="reference internal" href="#_CPPv419memcached_result_st" title="memcached_result_st"><code class="xref cpp cpp-type docutils literal notranslate"><span class="pre">memcached_result_st</span></code></a> has been encapsulated, you should
 275 not write code to directly access members of the structure.</p>
 276 <p><a class="reference internal" href="#_CPPv423memcached_result_createP12memcached_stP19memcached_result_st" title="memcached_result_create"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">memcached_result_create()</span></code></a> will either allocate memory for a
 277 <a class="reference internal" href="#_CPPv419memcached_result_st" title="memcached_result_st"><code class="xref cpp cpp-type docutils literal notranslate"><span class="pre">memcached_result_st</span></code></a> or will initialize a structure passed to it.</p>
 278 <p><a class="reference internal" href="#_CPPv421memcached_result_freeP19memcached_result_st" title="memcached_result_free"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">memcached_result_free()</span></code></a> will deallocate any memory attached to the
 279 structure. If the structure was also allocated, it will deallocate it.</p>
 280 <p><a class="reference internal" href="#_CPPv426memcached_result_key_valueP19memcached_result_st" title="memcached_result_key_value"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">memcached_result_key_value()</span></code></a> returns the key value associated with the
 281 current result object.</p>
 282 <p><a class="reference internal" href="#_CPPv427memcached_result_key_lengthPK19memcached_result_st" title="memcached_result_key_length"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">memcached_result_key_length()</span></code></a> returns the key length associated with
 283 the current result object.</p>
 284 <p><a class="reference internal" href="#_CPPv422memcached_result_valueP19memcached_result_st" title="memcached_result_value"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">memcached_result_value()</span></code></a> returns the result value associated with the
 285 current result object.</p>
 286 <p><a class="reference internal" href="#_CPPv427memcached_result_take_valueP19memcached_result_st" title="memcached_result_take_value"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">memcached_result_take_value()</span></code></a> returns and hands over the result value
 287 associated with the current result object. You must call free() to release this
 288 value, unless you have made use of a custom allocator. Use of a custom
 289 allocator requires that you create your own custom free() to release it.</p>
 290 <p><a class="reference internal" href="#_CPPv423memcached_result_lengthPK19memcached_result_st" title="memcached_result_length"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">memcached_result_length()</span></code></a> returns the result length associated with
 291 the current result object.</p>
 292 <p><a class="reference internal" href="#_CPPv422memcached_result_flagsPK19memcached_result_st" title="memcached_result_flags"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">memcached_result_flags()</span></code></a> returns the flags associated with the
 293 current result object.</p>
 294 <p><a class="reference internal" href="#_CPPv420memcached_result_casPK19memcached_result_st" title="memcached_result_cas"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">memcached_result_cas()</span></code></a> returns the cas associated with the
 295 current result object. This value will only be available if the server
 296 tests it.</p>
 297 <p><a class="reference internal" href="#_CPPv426memcached_result_set_valueP19memcached_result_stPKc6size_t" title="memcached_result_set_value"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">memcached_result_set_value()</span></code></a> takes a byte array and a size and sets
 298 the result to this value. This function is used for trigger responses.</p>
 299 <p><a class="reference internal" href="#_CPPv426memcached_result_set_flagsP19memcached_result_st8uint32_t" title="memcached_result_set_flags"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">memcached_result_set_flags()</span></code></a> takes a result structure and stores a new
 300 value for the flags field.</p>
 301 <p><a class="reference internal" href="#_CPPv431memcached_result_set_expirationP19memcached_result_st6time_t" title="memcached_result_set_expiration"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">memcached_result_set_expiration()</span></code></a> takes a result structure and stores
 302 a new value for the expiration field (this is only used by read through
 303 triggers).</p>
 304 <p>You may wish to avoid using memcached_result_create(3) with a
 305 stack based allocation. The most common issues related to ABI safety involve
 306 heap allocated structures.</p>
 307 </div>
 308 <div class="section" id="return-value">
 309 <h2>RETURN VALUE<a class="headerlink" href="#return-value" title="Permalink to this headline">¶</a></h2>
 310 <p>Varies, see particular functions. All structures must have
 311 <a class="reference internal" href="#_CPPv421memcached_result_freeP19memcached_result_st" title="memcached_result_free"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">memcached_result_free()</span></code></a> called on them for cleanup purposes. Failure
 312 to do this will result in leaked memory.</p>
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