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[13/25] mesos-site git commit: Updated the website built from mesos SHA: ed83065.

http://git-wip-us.apache.org/repos/asf/mesos-site/blob/32a8ab49/content/api/latest/c++/push__gauge_8hpp_source.html
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+<li class="navelem"><a class="el" href="dir_8cab8f464681f7cc51cee77e79a434cd.html">3rdparty</a></li><li class="navelem"><a class="el" href="dir_043a76de98701f9bddf61b5e98f305ff.html">libprocess</a></li><li class="navelem"><a class="el" href="dir_eac18f7a64f6f8afbd1493ef4e09abdb.html">include</a></li><li class="navelem"><a class="el" href="dir_1894286df79cf582d947dbc4268b06cf.html">process</a></li><li class="navelem"><a class="el" href="dir_0c2042cbda9076eebbde73e7b1892dff.html">metrics</a></li>  </ul>
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+<a href="push__gauge_8hpp.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;<span class="comment">// Licensed under the Apache License, Version 2.0 (the &quot;License&quot;);</span></div><div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160;<span class="comment">// you may not use this file except in compliance with the License.</span></div><div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;<span class="comment">// You may obtain a copy of the License at</span></div><div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;<span class="comment">//</span></div><div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160;<span class="comment">//     http://www.apache.org/licenses/LICENSE-2.0</span></div><div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;<span class="comment">/
 /</span></div><div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160;<span class="comment">// Unless required by applicable law or agreed to in writing, software</span></div><div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;<span class="comment">// distributed under the License is distributed on an &quot;AS IS&quot; BASIS,</span></div><div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160;<span class="comment">// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span></div><div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160;<span class="comment">// See the License for the specific language governing permissions and</span></div><div class="line"><a name="l00011"></a><span class="lineno">   11</span>&#160;<span class="comment">// limitations under the License</span></div><div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160;</div><div clas
 s="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;<span class="preprocessor">#ifndef __PROCESS_METRICS_PUSH_GAUGE_HPP__</span></div><div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160;<span class="preprocessor">#define __PROCESS_METRICS_PUSH_GAUGE_HPP__</span></div><div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160;</div><div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160;<span class="preprocessor">#include &lt;memory&gt;</span></div><div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160;<span class="preprocessor">#include &lt;string&gt;</span></div><div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160;</div><div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160;<span class="preprocessor">#include &lt;<a class="code" href="metric_8hpp.html">process/metrics/metric.hpp</a>&gt;</span></div><div class="line"><a name="l000
 20"></a><span class="lineno">   20</span>&#160;</div><div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;<span class="keyword">namespace </span><a class="code" href="namespaceprocess.html">process</a> {</div><div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;<span class="keyword">namespace </span><a class="code" href="namespaceprocess_1_1metrics_1_1internal.html#aaa37243f659788386a13de558eba70a7">metrics</a> {</div><div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;</div><div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;<span class="comment">// A Metric that represents an instantaneous measurement of a value</span></div><div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;<span class="comment">// (e.g. number of items in a queue).</span></div><div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;<span class="comment">//</span></
 div><div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;<span class="comment">// A push-based gauge differs from a pull-based gauge in that the</span></div><div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;<span class="comment">// client is responsible for pushing the latest value into the gauge</span></div><div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;<span class="comment">// whenever it changes. This can be challenging in some cases as it</span></div><div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;<span class="comment">// requires the client to have a good handle on when the gauge value</span></div><div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;<span class="comment">// changes (rather than just computing the current value when asked).</span></div><div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;<span class="
 comment">//</span></div><div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;<span class="comment">// NOTE: It is highly recommended to use push-based gauges if</span></div><div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;<span class="comment">// possible as they provide significant performance benefits over</span></div><div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;<span class="comment">// pull-based gauges. Pull-based gauge suffer from delays getting</span></div><div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;<span class="comment">// processed on the event queue of a `Process`, as well as incur</span></div><div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;<span class="comment">// computation cost on the `Process` each time the metrics are</span></div><div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;<span class="
 comment">// collected. Push-based gauges, on the other hand, incur no cost</span></div><div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;<span class="comment">// to the owning `Process` when metrics are collected, and instead</span></div><div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;<span class="comment">// incur a trivial cost when the `Process` pushes new values in.</span></div><div class="line"><a name="l00041"></a><span class="lineno"><a class="line" href="classprocess_1_1metrics_1_1PushGauge.html">   41</a></span>&#160;<span class="keyword">class </span><a class="code" href="classprocess_1_1metrics_1_1PushGauge.html">PushGauge</a> : <span class="keyword">public</span> <a class="code" href="classprocess_1_1metrics_1_1Metric.html">Metric</a></div><div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;{</div><div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;<span class="k
 eyword">public</span>:</div><div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;  <span class="comment">// &#39;name&#39; is the unique name for the instance of Gauge being constructed.</span></div><div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;  <span class="comment">// It will be the key exposed in the JSON endpoint.</span></div><div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;  <span class="comment">//</span></div><div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;  <span class="comment">// &#39;f&#39; is the function that is called when the Metric value is requested.</span></div><div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;  <span class="comment">// The user of `Gauge` must ensure that `f` is safe to execute up until</span></div><div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;  <span class="comment">// the
  removal of the `Gauge` (via `process::metrics::remove(...)`) is</span></div><div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;  <span class="comment">// complete.</span></div><div class="line"><a name="l00051"></a><span class="lineno"><a class="line" href="classprocess_1_1metrics_1_1PushGauge.html#a85012e16d8cd9e51a15d7b7c3c3d578f">   51</a></span>&#160;  <span class="keyword">explicit</span> <a class="code" href="classprocess_1_1metrics_1_1PushGauge.html#a85012e16d8cd9e51a15d7b7c3c3d578f">PushGauge</a>(<span class="keyword">const</span> std::string&amp; <a class="code" href="classprocess_1_1metrics_1_1Metric.html#a5b8063ac3b08d202c2f1736661ba1950">name</a>)</div><div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;    : <a class="code" href="classprocess_1_1metrics_1_1Metric.html">Metric</a>(name, <a class="code" href="structNone.html">None</a>()), data(new Data()) {}</div><div class="line"><a name="l00053"></a><span class="line
 no">   53</span>&#160;</div><div class="line"><a name="l00054"></a><span class="lineno"><a class="line" href="classprocess_1_1metrics_1_1PushGauge.html#ae02fde2c3fee24885a07f87474bed2b9">   54</a></span>&#160;  <span class="keyword">virtual</span> <a class="code" href="classprocess_1_1metrics_1_1PushGauge.html#ae02fde2c3fee24885a07f87474bed2b9">~PushGauge</a>() {}</div><div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;</div><div class="line"><a name="l00056"></a><span class="lineno"><a class="line" href="classprocess_1_1metrics_1_1PushGauge.html#acab89252b2bb25d398ee9a7e460d6f3d">   56</a></span>&#160;  <span class="keyword">virtual</span> <a class="code" href="classprocess_1_1Future.html">Future&lt;double&gt;</a> <a class="code" href="classprocess_1_1metrics_1_1PushGauge.html#acab89252b2bb25d398ee9a7e460d6f3d">value</a>()<span class="keyword"> const</span></div><div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;<span class="key
 word">  </span>{</div><div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;    <span class="keywordflow">return</span> <span class="keyword">static_cast&lt;</span><span class="keywordtype">double</span><span class="keyword">&gt;</span>(data-&gt;value.load());</div><div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;  }</div><div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;</div><div class="line"><a name="l00061"></a><span class="lineno"><a class="line" href="classprocess_1_1metrics_1_1PushGauge.html#a543889ca6646b519431a4e87f555c4dd">   61</a></span>&#160;  <a class="code" href="classprocess_1_1metrics_1_1PushGauge.html">PushGauge</a>&amp; <a class="code" href="classprocess_1_1metrics_1_1PushGauge.html#a543889ca6646b519431a4e87f555c4dd">operator=</a>(int64_t v)</div><div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;  {</div><div class="line"><a name="l00063"></a><span class="l
 ineno">   63</span>&#160;    data-&gt;value.store(v);</div><div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;    <a class="code" href="classprocess_1_1metrics_1_1Metric.html#a062843ad9a1376532c176370a09e29d2">push</a>(v);</div><div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;    <span class="keywordflow">return</span> *<span class="keyword">this</span>;</div><div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;  }</div><div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;</div><div class="line"><a name="l00068"></a><span class="lineno"><a class="line" href="classprocess_1_1metrics_1_1PushGauge.html#a3188a09f62bff838f846181738ce1ed4">   68</a></span>&#160;  <a class="code" href="classprocess_1_1metrics_1_1PushGauge.html">PushGauge</a>&amp; <a class="code" href="classprocess_1_1metrics_1_1PushGauge.html#a3188a09f62bff838f846181738ce1ed4">operator++</a>() { <span class="keywordflo
 w">return</span> *<span class="keyword">this</span> += 1; }</div><div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;</div><div class="line"><a name="l00070"></a><span class="lineno"><a class="line" href="classprocess_1_1metrics_1_1PushGauge.html#a4b9e9b5a2d3b20c760e59649368f29a2">   70</a></span>&#160;  <a class="code" href="classprocess_1_1metrics_1_1PushGauge.html">PushGauge</a>&amp; <a class="code" href="classprocess_1_1metrics_1_1PushGauge.html#a4b9e9b5a2d3b20c760e59649368f29a2">operator+=</a>(int64_t v)</div><div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;  {</div><div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;    int64_t prev = data-&gt;value.fetch_add(v);</div><div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;    <a class="code" href="classprocess_1_1metrics_1_1Metric.html#a062843ad9a1376532c176370a09e29d2">push</a>(static_cast&lt;double&gt;(prev + v));</div><di
 v class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;    <span class="keywordflow">return</span> *<span class="keyword">this</span>;</div><div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160;  }</div><div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;</div><div class="line"><a name="l00077"></a><span class="lineno"><a class="line" href="classprocess_1_1metrics_1_1PushGauge.html#a200bf66d24f92fdb90063ae921979ef7">   77</a></span>&#160;  <a class="code" href="classprocess_1_1metrics_1_1PushGauge.html">PushGauge</a>&amp; <a class="code" href="classprocess_1_1metrics_1_1PushGauge.html#a200bf66d24f92fdb90063ae921979ef7">operator--</a>() { <span class="keywordflow">return</span> *<span class="keyword">this</span> -= 1; }</div><div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160;</div><div class="line"><a name="l00079"></a><span class="lineno"><a class="line" href="classprocess_1_1metrics_1_1
 PushGauge.html#a0c90ae1bca61c2cef3049fbfe5eb5fa7">   79</a></span>&#160;  <a class="code" href="classprocess_1_1metrics_1_1PushGauge.html">PushGauge</a>&amp; <a class="code" href="classprocess_1_1metrics_1_1PushGauge.html#a0c90ae1bca61c2cef3049fbfe5eb5fa7">operator-=</a>(int64_t v)</div><div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;  {</div><div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;    int64_t prev = data-&gt;value.fetch_sub(v);</div><div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;    <a class="code" href="classprocess_1_1metrics_1_1Metric.html#a062843ad9a1376532c176370a09e29d2">push</a>(static_cast&lt;double&gt;(prev - v));</div><div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;    <span class="keywordflow">return</span> *<span class="keyword">this</span>;</div><div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;  }</div><div class=
 "line"><a name="l00085"></a><span class="lineno">   85</span>&#160;</div><div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;<span class="keyword">private</span>:</div><div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;  <span class="keyword">struct </span>Data</div><div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160;  {</div><div class="line"><a name="l00089"></a><span class="lineno">   89</span>&#160;    <span class="keyword">explicit</span> Data() : <a class="code" href="classprocess_1_1metrics_1_1PushGauge.html#acab89252b2bb25d398ee9a7e460d6f3d">value</a>(0) {}</div><div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160;</div><div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;    std::atomic&lt;int64_t&gt; <a class="code" href="classprocess_1_1metrics_1_1PushGauge.html#acab89252b2bb25d398ee9a7e460d6f3d">value</a>;</div><div class="line"><a name="l00092
 "></a><span class="lineno">   92</span>&#160;  };</div><div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160;</div><div class="line"><a name="l00094"></a><span class="lineno">   94</span>&#160;  std::shared_ptr&lt;Data&gt; data;</div><div class="line"><a name="l00095"></a><span class="lineno">   95</span>&#160;};</div><div class="line"><a name="l00096"></a><span class="lineno">   96</span>&#160;</div><div class="line"><a name="l00097"></a><span class="lineno">   97</span>&#160;} <span class="comment">// namespace metrics {</span></div><div class="line"><a name="l00098"></a><span class="lineno">   98</span>&#160;} <span class="comment">// namespace process {</span></div><div class="line"><a name="l00099"></a><span class="lineno">   99</span>&#160;</div><div class="line"><a name="l00100"></a><span class="lineno">  100</span>&#160;<span class="preprocessor">#endif // __PROCESS_METRICS_PUSH_GAUGE_HPP__</span></div><div class="ttc" id="classprocess_1_1metrics_1_1P
 ushGauge_html_a543889ca6646b519431a4e87f555c4dd"><div class="ttname"><a href="classprocess_1_1metrics_1_1PushGauge.html#a543889ca6646b519431a4e87f555c4dd">process::metrics::PushGauge::operator=</a></div><div class="ttdeci">PushGauge &amp; operator=(int64_t v)</div><div class="ttdef"><b>Definition:</b> push_gauge.hpp:61</div></div>
+<div class="ttc" id="classprocess_1_1metrics_1_1PushGauge_html_a200bf66d24f92fdb90063ae921979ef7"><div class="ttname"><a href="classprocess_1_1metrics_1_1PushGauge.html#a200bf66d24f92fdb90063ae921979ef7">process::metrics::PushGauge::operator--</a></div><div class="ttdeci">PushGauge &amp; operator--()</div><div class="ttdef"><b>Definition:</b> push_gauge.hpp:77</div></div>
+<div class="ttc" id="metric_8hpp_html"><div class="ttname"><a href="metric_8hpp.html">metric.hpp</a></div></div>
+<div class="ttc" id="classprocess_1_1metrics_1_1PushGauge_html_a3188a09f62bff838f846181738ce1ed4"><div class="ttname"><a href="classprocess_1_1metrics_1_1PushGauge.html#a3188a09f62bff838f846181738ce1ed4">process::metrics::PushGauge::operator++</a></div><div class="ttdeci">PushGauge &amp; operator++()</div><div class="ttdef"><b>Definition:</b> push_gauge.hpp:68</div></div>
+<div class="ttc" id="classprocess_1_1metrics_1_1Metric_html"><div class="ttname"><a href="classprocess_1_1metrics_1_1Metric.html">process::metrics::Metric</a></div><div class="ttdef"><b>Definition:</b> metric.hpp:33</div></div>
+<div class="ttc" id="classprocess_1_1metrics_1_1PushGauge_html_acab89252b2bb25d398ee9a7e460d6f3d"><div class="ttname"><a href="classprocess_1_1metrics_1_1PushGauge.html#acab89252b2bb25d398ee9a7e460d6f3d">process::metrics::PushGauge::value</a></div><div class="ttdeci">virtual Future&lt; double &gt; value() const </div><div class="ttdef"><b>Definition:</b> push_gauge.hpp:56</div></div>
+<div class="ttc" id="classprocess_1_1metrics_1_1PushGauge_html_a4b9e9b5a2d3b20c760e59649368f29a2"><div class="ttname"><a href="classprocess_1_1metrics_1_1PushGauge.html#a4b9e9b5a2d3b20c760e59649368f29a2">process::metrics::PushGauge::operator+=</a></div><div class="ttdeci">PushGauge &amp; operator+=(int64_t v)</div><div class="ttdef"><b>Definition:</b> push_gauge.hpp:70</div></div>
+<div class="ttc" id="classprocess_1_1metrics_1_1PushGauge_html_ae02fde2c3fee24885a07f87474bed2b9"><div class="ttname"><a href="classprocess_1_1metrics_1_1PushGauge.html#ae02fde2c3fee24885a07f87474bed2b9">process::metrics::PushGauge::~PushGauge</a></div><div class="ttdeci">virtual ~PushGauge()</div><div class="ttdef"><b>Definition:</b> push_gauge.hpp:54</div></div>
+<div class="ttc" id="structNone_html"><div class="ttname"><a href="structNone.html">None</a></div><div class="ttdef"><b>Definition:</b> none.hpp:27</div></div>
+<div class="ttc" id="classprocess_1_1metrics_1_1PushGauge_html_a0c90ae1bca61c2cef3049fbfe5eb5fa7"><div class="ttname"><a href="classprocess_1_1metrics_1_1PushGauge.html#a0c90ae1bca61c2cef3049fbfe5eb5fa7">process::metrics::PushGauge::operator-=</a></div><div class="ttdeci">PushGauge &amp; operator-=(int64_t v)</div><div class="ttdef"><b>Definition:</b> push_gauge.hpp:79</div></div>
+<div class="ttc" id="classprocess_1_1metrics_1_1Metric_html_a5b8063ac3b08d202c2f1736661ba1950"><div class="ttname"><a href="classprocess_1_1metrics_1_1Metric.html#a5b8063ac3b08d202c2f1736661ba1950">process::metrics::Metric::name</a></div><div class="ttdeci">const std::string &amp; name() const </div><div class="ttdef"><b>Definition:</b> metric.hpp:39</div></div>
+<div class="ttc" id="namespaceprocess_html"><div class="ttname"><a href="namespaceprocess.html">process</a></div><div class="ttdef"><b>Definition:</b> executor.hpp:47</div></div>
+<div class="ttc" id="classprocess_1_1metrics_1_1PushGauge_html_a85012e16d8cd9e51a15d7b7c3c3d578f"><div class="ttname"><a href="classprocess_1_1metrics_1_1PushGauge.html#a85012e16d8cd9e51a15d7b7c3c3d578f">process::metrics::PushGauge::PushGauge</a></div><div class="ttdeci">PushGauge(const std::string &amp;name)</div><div class="ttdef"><b>Definition:</b> push_gauge.hpp:51</div></div>
+<div class="ttc" id="classprocess_1_1metrics_1_1Metric_html_a062843ad9a1376532c176370a09e29d2"><div class="ttname"><a href="classprocess_1_1metrics_1_1Metric.html#a062843ad9a1376532c176370a09e29d2">process::metrics::Metric::push</a></div><div class="ttdeci">void push(double value)</div><div class="ttdef"><b>Definition:</b> metric.hpp:63</div></div>
+<div class="ttc" id="classprocess_1_1metrics_1_1PushGauge_html"><div class="ttname"><a href="classprocess_1_1metrics_1_1PushGauge.html">process::metrics::PushGauge</a></div><div class="ttdef"><b>Definition:</b> push_gauge.hpp:41</div></div>
+<div class="ttc" id="namespaceprocess_1_1metrics_1_1internal_html_aaa37243f659788386a13de558eba70a7"><div class="ttname"><a href="namespaceprocess_1_1metrics_1_1internal.html#aaa37243f659788386a13de558eba70a7">process::metrics::internal::metrics</a></div><div class="ttdeci">PID&lt; MetricsProcess &gt; metrics</div></div>
+<div class="ttc" id="classprocess_1_1Future_html"><div class="ttname"><a href="classprocess_1_1Future.html">process::Future</a></div><div class="ttdef"><b>Definition:</b> future.hpp:57</div></div>
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