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 210
 211   <div class="section" id="working-with-result-sets">
 212 <h1>Working with result sets<a class="headerlink" href="#working-with-result-sets" title="Permalink to this headline">¶</a></h1>
 213 <div class="section" id="synopsis">
 214 <h2>SYNOPSIS<a class="headerlink" href="#synopsis" title="Permalink to this headline">¶</a></h2>
 215 <p>#include &lt;libmemcached/memcached_pool.h&gt;</p>
 216 <dl class="type">
 217 <dt id="_CPPv419memcached_result_st">
 218 <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>
 219 <dd></dd></dl>
 220
 221 <dl class="function">
 222 <dt id="_CPPv423memcached_result_createP12memcached_stP19memcached_result_st">
 223 <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>
 224 <dd></dd></dl>
 225
 226 <dl class="function">
 227 <dt id="_CPPv421memcached_result_freeP19memcached_result_st">
 228 <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>
 229 <dd></dd></dl>
 230
 231 <dl class="function">
 232 <dt id="_CPPv426memcached_result_key_valueP19memcached_result_st">
 233 <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>
 234 <dd></dd></dl>
 235
 236 <dl class="function">
 237 <dt id="_CPPv427memcached_result_key_lengthPK19memcached_result_st">
 238 <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>
 239 <dd></dd></dl>
 240
 241 <dl class="function">
 242 <dt id="_CPPv422memcached_result_valueP19memcached_result_st">
 243 <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>
 244 <dd></dd></dl>
 245
 246 <dl class="function">
 247 <dt id="_CPPv427memcached_result_take_valueP19memcached_result_st">
 248 <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>
 249 <dd></dd></dl>
 250
 251 <dl class="function">
 252 <dt id="_CPPv423memcached_result_lengthPK19memcached_result_st">
 253 <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>
 254 <dd></dd></dl>
 255
 256 <dl class="function">
 257 <dt id="_CPPv422memcached_result_flagsPK19memcached_result_st">
 258 <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>
 259 <dd></dd></dl>
 260
 261 <dl class="function">
 262 <dt id="_CPPv420memcached_result_casPK19memcached_result_st">
 263 <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>
 264 <dd></dd></dl>
 265
 266 <dl class="function">
 267 <dt id="_CPPv426memcached_result_set_valueP19memcached_result_stPKc6size_t">
 268 <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>
 269 <dd></dd></dl>
 270
 271 <dl class="function">
 272 <dt id="_CPPv426memcached_result_set_flagsP19memcached_result_st8uint32_t">
 273 <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>
 274 <dd></dd></dl>
 275
 276 <dl class="function">
 277 <dt id="_CPPv431memcached_result_set_expirationP19memcached_result_st6time_t">
 278 <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>
 279 <dd></dd></dl>
 280
 281 <p>Compile and link with -lmemcachedutil -lmemcached</p>
 282 </div>
 283 <div class="section" id="description">
 284 <h2>DESCRIPTION<a class="headerlink" href="#description" title="Permalink to this headline">¶</a></h2>
 285 <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
 286 acts as a result object. The result objects have added benefits over the
 287 character pointer returns, in that they are forward compatible with new
 288 return items that future memcached servers may implement (the best current
 289 example of this is the CAS return item). The structures can also be reused,
 290 which will save on calls to malloc(3). It is suggested that you use result
 291 objects over char * return functions.</p>
 292 <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
 293 not write code to directly access members of the structure.</p>
 294 <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
 295 <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>
 296 <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
 297 structure. If the structure was also allocated, it will deallocate it.</p>
 298 <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
 299 current result object.</p>
 300 <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
 301 the current result object.</p>
 302 <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
 303 current result object.</p>
 304 <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
 305 associated with the current result object. You must call free() to release this
 306 value, unless you have made use of a custom allocator. Use of a custom
 307 allocator requires that you create your own custom free() to release it.</p>
 308 <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
 309 the current result object.</p>
 310 <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
 311 current result object.</p>
 312 <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
 313 current result object. This value will only be available if the server
 314 tests it.</p>
 315 <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
 316 the result to this value. This function is used for trigger responses.</p>
 317 <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
 318 value for the flags field.</p>
 319 <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
 320 a new value for the expiration field (this is only used by read through
 321 triggers).</p>
 322 <p>You may wish to avoid using memcached_result_create(3) with a
 323 stack based allocation. The most common issues related to ABI safety involve
 324 heap allocated structures.</p>
 325 </div>
 326 <div class="section" id="return">
 327 <h2>RETURN<a class="headerlink" href="#return" title="Permalink to this headline">¶</a></h2>
 328 <p>Varies, see particular functions. All structures must have
 329 <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
 330 to do this will result in leaked memory.</p>
 331 </div>
 332 <div class="section" id="see-also">
 333 <h2>SEE ALSO<a class="headerlink" href="#see-also" title="Permalink to this headline">¶</a></h2>
 334 </div>
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