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  94 <li class="toctree-l3 current"><a class="current reference internal" href="#">Incrementing and Decrementing Values</a></li>
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 192
 193   <div class="section" id="incrementing-and-decrementing-values">
 194 <h1>Incrementing and Decrementing Values<a class="headerlink" href="#incrementing-and-decrementing-values" 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="simple">
 198 <dt>#include &lt;libmemcached/memcached.h&gt;</dt><dd><p>Compile and link with -lmemcached</p>
 199 </dd>
 200 </dl>
 201 <dl class="function">
 202 <dt id="_CPPv419memcached_incrementP12memcached_stPKc6size_t8uint32_tP8uint64_t">
 203 <span id="_CPPv319memcached_incrementP12memcached_stPKc6size_t8uint32_tP8uint64_t"></span><span id="_CPPv219memcached_incrementP12memcached_stPKc6size_t8uint32_tP8uint64_t"></span><span id="memcached_increment__memcached_stP.cCP.s.uint32_t.uint64_tP"></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_increment</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>, uint32_t <em>offset</em>, uint64_t *<em>value</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv419memcached_incrementP12memcached_stPKc6size_t8uint32_tP8uint64_t" title="Permalink to this definition">¶</a><br /></dt>
 204 <dd></dd></dl>
 205
 206 <dl class="function">
 207 <dt id="_CPPv419memcached_decrementP12memcached_stPKc6size_t8uint32_tP8uint64_t">
 208 <span id="_CPPv319memcached_decrementP12memcached_stPKc6size_t8uint32_tP8uint64_t"></span><span id="_CPPv219memcached_decrementP12memcached_stPKc6size_t8uint32_tP8uint64_t"></span><span id="memcached_decrement__memcached_stP.cCP.s.uint32_t.uint64_tP"></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_decrement</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>, uint32_t <em>offset</em>, uint64_t *<em>value</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv419memcached_decrementP12memcached_stPKc6size_t8uint32_tP8uint64_t" title="Permalink to this definition">¶</a><br /></dt>
 209 <dd></dd></dl>
 210
 211 <dl class="function">
 212 <dt id="_CPPv432memcached_increment_with_initialP12memcached_stPKc6size_t8uint64_t8uint64_t6time_tP8uint64_t">
 213 <span id="_CPPv332memcached_increment_with_initialP12memcached_stPKc6size_t8uint64_t8uint64_t6time_tP8uint64_t"></span><span id="_CPPv232memcached_increment_with_initialP12memcached_stPKc6size_t8uint64_t8uint64_t6time_tP8uint64_t"></span><span id="memcached_increment_with_initial__memcached_stP.cCP.s.uint64_t.uint64_t.time_t.uint64_tP"></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_increment_with_initial</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>, uint64_t <em>offset</em>, uint64_t <em>initial</em>, time_t <em>expiration</em>, uint64_t *<em>value</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv432memcached_increment_with_initialP12memcached_stPKc6size_t8uint64_t8uint64_t6time_tP8uint64_t" title="Permalink to this definition">¶</a><br /></dt>
 214 <dd></dd></dl>
 215
 216 <dl class="function">
 217 <dt id="_CPPv432memcached_decrement_with_initialP12memcached_stPKc6size_t8uint64_t8uint64_t6time_tP8uint64_t">
 218 <span id="_CPPv332memcached_decrement_with_initialP12memcached_stPKc6size_t8uint64_t8uint64_t6time_tP8uint64_t"></span><span id="_CPPv232memcached_decrement_with_initialP12memcached_stPKc6size_t8uint64_t8uint64_t6time_tP8uint64_t"></span><span id="memcached_decrement_with_initial__memcached_stP.cCP.s.uint64_t.uint64_t.time_t.uint64_tP"></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_decrement_with_initial</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>, uint64_t <em>offset</em>, uint64_t <em>initial</em>, time_t <em>expiration</em>, uint64_t *<em>value</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv432memcached_decrement_with_initialP12memcached_stPKc6size_t8uint64_t8uint64_t6time_tP8uint64_t" title="Permalink to this definition">¶</a><br /></dt>
 219 <dd></dd></dl>
 220
 221 <dl class="function">
 222 <dt id="_CPPv426memcached_increment_by_keyP12memcached_stPKc6size_tPKc6size_t8uint32_tP8uint64_t">
 223 <span id="_CPPv326memcached_increment_by_keyP12memcached_stPKc6size_tPKc6size_t8uint32_tP8uint64_t"></span><span id="_CPPv226memcached_increment_by_keyP12memcached_stPKc6size_tPKc6size_t8uint32_tP8uint64_t"></span><span id="memcached_increment_by_key__memcached_stP.cCP.s.cCP.s.uint32_t.uint64_tP"></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_increment_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>, uint32_t <em>offset</em>, uint64_t *<em>value</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv426memcached_increment_by_keyP12memcached_stPKc6size_tPKc6size_t8uint32_tP8uint64_t" title="Permalink to this definition">¶</a><br /></dt>
 224 <dd></dd></dl>
 225
 226 <dl class="function">
 227 <dt id="_CPPv426memcached_decrement_by_keyP12memcached_stPKc6size_tPKc6size_t8uint32_tP8uint64_t">
 228 <span id="_CPPv326memcached_decrement_by_keyP12memcached_stPKc6size_tPKc6size_t8uint32_tP8uint64_t"></span><span id="_CPPv226memcached_decrement_by_keyP12memcached_stPKc6size_tPKc6size_t8uint32_tP8uint64_t"></span><span id="memcached_decrement_by_key__memcached_stP.cCP.s.cCP.s.uint32_t.uint64_tP"></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_decrement_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>, uint32_t <em>offset</em>, uint64_t *<em>value</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv426memcached_decrement_by_keyP12memcached_stPKc6size_tPKc6size_t8uint32_tP8uint64_t" title="Permalink to this definition">¶</a><br /></dt>
 229 <dd></dd></dl>
 230
 231 <dl class="function">
 232 <dt id="_CPPv439memcached_increment_with_initial_by_keyP12memcached_stPKc6size_tPKc6size_t8uint64_t8uint64_t6time_tP8uint64_t">
 233 <span id="_CPPv339memcached_increment_with_initial_by_keyP12memcached_stPKc6size_tPKc6size_t8uint64_t8uint64_t6time_tP8uint64_t"></span><span id="_CPPv239memcached_increment_with_initial_by_keyP12memcached_stPKc6size_tPKc6size_t8uint64_t8uint64_t6time_tP8uint64_t"></span><span id="memcached_increment_with_initial_by_key__memcached_stP.cCP.s.cCP.s.uint64_t.uint64_t.time_t.uint64_tP"></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_increment_with_initial_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>, uint64_t <em>offset</em>, uint64_t <em>initial</em>, time_t <em>expiration</em>, uint64_t *<em>value</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv439memcached_increment_with_initial_by_keyP12memcached_stPKc6size_tPKc6size_t8uint64_t8uint64_t6time_tP8uint64_t" title="Permalink to this definition">¶</a><br /></dt>
 234 <dd></dd></dl>
 235
 236 <dl class="function">
 237 <dt id="_CPPv439memcached_decrement_with_initial_by_keyP12memcached_stPKc6size_tPKc6size_t8uint64_t8uint64_t6time_tP8uint64_t">
 238 <span id="_CPPv339memcached_decrement_with_initial_by_keyP12memcached_stPKc6size_tPKc6size_t8uint64_t8uint64_t6time_tP8uint64_t"></span><span id="_CPPv239memcached_decrement_with_initial_by_keyP12memcached_stPKc6size_tPKc6size_t8uint64_t8uint64_t6time_tP8uint64_t"></span><span id="memcached_decrement_with_initial_by_key__memcached_stP.cCP.s.cCP.s.uint64_t.uint64_t.time_t.uint64_tP"></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_decrement_with_initial_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>, uint64_t <em>offset</em>, uint64_t <em>initial</em>, time_t <em>expiration</em>, uint64_t *<em>value</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv439memcached_decrement_with_initial_by_keyP12memcached_stPKc6size_tPKc6size_t8uint64_t8uint64_t6time_tP8uint64_t" title="Permalink to this definition">¶</a><br /></dt>
 239 <dd></dd></dl>
 240
 241 </div>
 242 <div class="section" id="description">
 243 <h2>DESCRIPTION<a class="headerlink" href="#description" title="Permalink to this headline">¶</a></h2>
 244 <p><em class="manpage"><a class="manpage reference external" href="http://man7.org/linux/man-pages/man1/memcached.1.html">memcached(1)</a></em> servers have the ability to increment and decrement keys
 245 (overflow and underflow are not detected). This gives you the ability to use
 246 memcached to generate shared sequences of values.</p>
 247 <p><a class="reference internal" href="#_CPPv419memcached_incrementP12memcached_stPKc6size_t8uint32_tP8uint64_t" title="memcached_increment"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_increment()</span></code></a> takes a <code class="docutils literal notranslate"><span class="pre">key</span></code> and <code class="docutils literal notranslate"><span class="pre">key_length</span></code> and increments the
 248 value by the <code class="docutils literal notranslate"><span class="pre">offset</span></code> passed to it. The value is then returned via the
 249 uint32_t <code class="docutils literal notranslate"><span class="pre">value</span></code> pointer you pass to it.</p>
 250 <p><a class="reference internal" href="#_CPPv419memcached_decrementP12memcached_stPKc6size_t8uint32_tP8uint64_t" title="memcached_decrement"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_decrement()</span></code></a> takes a <code class="docutils literal notranslate"><span class="pre">key</span></code> and <code class="docutils literal notranslate"><span class="pre">key_length</span></code> and decrements the
 251 value by the <code class="docutils literal notranslate"><span class="pre">offset</span></code> passed to it. The value is then returned via the
 252 uint32_t <code class="docutils literal notranslate"><span class="pre">value</span></code> pointer you pass to it.</p>
 253 <p><a class="reference internal" href="#_CPPv432memcached_increment_with_initialP12memcached_stPKc6size_t8uint64_t8uint64_t6time_tP8uint64_t" title="memcached_increment_with_initial"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_increment_with_initial()</span></code></a> takes a <code class="docutils literal notranslate"><span class="pre">key</span></code> and <code class="docutils literal notranslate"><span class="pre">key_length</span></code> and
 254 increments the value by the <code class="docutils literal notranslate"><span class="pre">offset</span></code> passed to it. If the object specified by
 255 <code class="docutils literal notranslate"><span class="pre">key</span></code> does not exist, one of two things may happen: If the <code class="docutils literal notranslate"><span class="pre">expiration</span></code>
 256 value is <a class="reference internal" href="constants.html#c.MEMCACHED_EXPIRATION_NOT_ADD" title="MEMCACHED_EXPIRATION_NOT_ADD"><code class="xref c c-macro docutils literal notranslate"><span class="pre">MEMCACHED_EXPIRATION_NOT_ADD</span></code></a>, the operation will fail. For
 257 all other <code class="docutils literal notranslate"><span class="pre">expiration</span></code> values, the operation will succeed by seeding the value
 258 for that key with a initial value to expire with the provided expiration time.
 259 The <code class="docutils literal notranslate"><span class="pre">flags</span></code> will be set to zero. The value is then returned via the uint32_t
 260 <code class="docutils literal notranslate"><span class="pre">value</span></code> pointer you pass to it. <code class="docutils literal notranslate"><span class="pre">memcached_increment_with_initial</span></code> is only
 261 available when using the binary protocol.</p>
 262 <p><a class="reference internal" href="#_CPPv432memcached_decrement_with_initialP12memcached_stPKc6size_t8uint64_t8uint64_t6time_tP8uint64_t" title="memcached_decrement_with_initial"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_decrement_with_initial()</span></code></a> takes a <code class="docutils literal notranslate"><span class="pre">key</span></code> and <code class="docutils literal notranslate"><span class="pre">key_length</span></code> and
 263 decrements the value by the <code class="docutils literal notranslate"><span class="pre">offset</span></code> passed to it. If the object specified by
 264 <code class="docutils literal notranslate"><span class="pre">key</span></code> does not exist, one of two things may happen: If the <code class="docutils literal notranslate"><span class="pre">expiration</span></code>
 265 value is <a class="reference internal" href="constants.html#c.MEMCACHED_EXPIRATION_NOT_ADD" title="MEMCACHED_EXPIRATION_NOT_ADD"><code class="xref c c-macro docutils literal notranslate"><span class="pre">MEMCACHED_EXPIRATION_NOT_ADD</span></code></a>, the operation will fail. For
 266 all other <code class="docutils literal notranslate"><span class="pre">expiration</span></code> values, the operation will succeed by seeding the value
 267 for that key with a initial value to expire with the provided expiration time.
 268 The <code class="docutils literal notranslate"><span class="pre">flags</span></code> will be set to zero. The value is then returned via the uint32_t
 269 <code class="docutils literal notranslate"><span class="pre">value</span></code> pointer you pass to it. <a class="reference internal" href="#_CPPv432memcached_decrement_with_initialP12memcached_stPKc6size_t8uint64_t8uint64_t6time_tP8uint64_t" title="memcached_decrement_with_initial"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_decrement_with_initial()</span></code></a> is only
 270 available when using the binary protocol.</p>
 271 <p><a class="reference internal" href="#_CPPv426memcached_increment_by_keyP12memcached_stPKc6size_tPKc6size_t8uint32_tP8uint64_t" title="memcached_increment_by_key"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_increment_by_key()</span></code></a>, <a class="reference internal" href="#_CPPv426memcached_decrement_by_keyP12memcached_stPKc6size_tPKc6size_t8uint32_tP8uint64_t" title="memcached_decrement_by_key"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_decrement_by_key()</span></code></a>,
 272 <a class="reference internal" href="#_CPPv439memcached_increment_with_initial_by_keyP12memcached_stPKc6size_tPKc6size_t8uint64_t8uint64_t6time_tP8uint64_t" title="memcached_increment_with_initial_by_key"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_increment_with_initial_by_key()</span></code></a>, and
 273 <a class="reference internal" href="#_CPPv439memcached_decrement_with_initial_by_keyP12memcached_stPKc6size_tPKc6size_t8uint64_t8uint64_t6time_tP8uint64_t" title="memcached_decrement_with_initial_by_key"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_decrement_with_initial_by_key()</span></code></a> are master key equivalents of the
 274 above.</p>
 275 </div>
 276 <div class="section" id="return-value">
 277 <h2>RETURN VALUE<a class="headerlink" href="#return-value" title="Permalink to this headline">¶</a></h2>
 278 <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-any docutils literal notranslate"><span class="pre">memcached_return_t</span></code></a>  is returned.
 279 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>.
 280 Use <a class="reference internal" href="memcached_strerror.html#_CPPv418memcached_strerrorP12memcached_st18memcached_return_t" title="memcached_strerror"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_strerror()</span></code></a> to translate this value to a printable string.</p>
 281 </div>
 282 <div class="section" id="see-also">
 283 <h2>SEE ALSO<a class="headerlink" href="#see-also" title="Permalink to this headline">¶</a></h2>
 284 <ul class="simple">
 285 <li><p><em class="manpage"><a class="manpage reference external" href="http://man7.org/linux/man-pages/man1/memcached.1.html">memcached(1)</a></em></p></li>
 286 <li><p><a class="reference internal" href="../libmemcached.html"><span class="doc">C/C++ Client Library for memcached</span></a></p></li>
 287 <li><p><a class="reference internal" href="memcached_strerror.html"><span class="doc">Converting Error Codes to Messages</span></a></p></li>
 288 </ul>
 289 </div>
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