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From git-site-r...@apache.org
Subject [07/26] mesos-site git commit: Updated the website built from mesos SHA: 3d2a1fd.
Date Wed, 23 May 2018 23:55:19 GMT
http://git-wip-us.apache.org/repos/asf/mesos-site/blob/805f4c5b/content/api/latest/c++/loop_8hpp_source.html
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diff --git a/content/api/latest/c++/loop_8hpp_source.html b/content/api/latest/c++/loop_8hpp_source.html
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@@ -53,31 +53,31 @@
 </div><!--header-->
 <div class="contents">
 <a href="loop_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 class="line
 "><a name="l00013"></a><span class="lineno">   13</span>&#160;<span class="preprocessor">#ifndef __PROCESS_LOOP_HPP__</span></div><div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160;<span class="preprocessor">#define __PROCESS_LOOP_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;mutex&gt;</span></div><div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160;</div><div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160;<span class="preprocessor">#include &lt;<a class="code" href="defer_8hpp.html">process/defer.hpp</a>&gt;</span></div><div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160;<span class="preprocessor">#include &lt;<a class="code" href="dispatch_8hpp.html">process/dispatch.hpp</a>&gt;</span></div><div class="line"
 ><a name="l00020"></a><span class="lineno">   20</span>&#160;<span class="preprocessor">#include &lt;<a class="code" href="future_8hpp.html">process/future.hpp</a>&gt;</span></div><div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;<span class="preprocessor">#include &lt;<a class="code" href="owned_8hpp.html">process/owned.hpp</a>&gt;</span></div><div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;<span class="preprocessor">#include &lt;<a class="code" href="3rdparty_2libprocess_2include_2process_2pid_8hpp.html">process/pid.hpp</a>&gt;</span></div><div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;<span class="preprocessor">#include &lt;<a class="code" href="libprocess_2include_2process_2process_8hpp.html">process/process.hpp</a>&gt;</span></div><div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;</div><div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;
 <span class="keyword">namespace </span><a class="code" href="namespaceprocess.html">process</a> {</div><div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;</div><div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;<span class="comment">// Provides an asynchronous &quot;loop&quot; abstraction. This abstraction is</span></div><div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;<span class="comment">// helpful for code that would have synchronously been written as a</span></div><div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;<span class="comment">// loop but asynchronously ends up being a recursive set of functions</span></div><div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;<span class="comment">// which depending on the compiler may result in a stack overflow</span></div><div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;<s
 pan class="comment">// (i.e., a compiler that can&#39;t do sufficient tail call optimization</span></div><div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;<span class="comment">// may add stack frames for each recursive call).</span></div><div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;<span class="comment">//</span></div><div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;<span class="comment">// The loop abstraction takes an optional PID `pid` and uses it as the</span></div><div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;<span class="comment">// execution context to run the loop. The implementation does a</span></div><div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;<span class="comment">// `defer` on this `pid` to &quot;pop&quot; the stack when it needs to</span></div><div class="line"><a name="l00037"></a><span class="lineno">   37</span>&
 #160;<span class="comment">// asynchronously recurse. This also lets callers synchronize</span></div><div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;<span class="comment">// execution with other code dispatching and deferring using `pid`. If</span></div><div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;<span class="comment">// `None` is passed for `pid` then no `defer` is done and the stack</span></div><div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;<span class="comment">// will still &quot;pop&quot; but be restarted from the execution context</span></div><div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;<span class="comment">// wherever the blocked future is completed. This is usually very safe</span></div><div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;<span class="comment">// when that blocked future will be completed by the IO thread, 
 but</span></div><div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;<span class="comment">// should not be used if it&#39;s completed by another process (because</span></div><div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;<span class="comment">// you&#39;ll block that process until the next time the loop blocks).</span></div><div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;<span class="comment">//</span></div><div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;<span class="comment">// The two functions passed to the loop represent the loop &quot;iterate&quot;</span></div><div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;<span class="comment">// step and the loop &quot;body&quot; step respectively. Each invocation of</span></div><div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;<span class="comment">// &quot;iterate&quo
 t; returns the next value and the &quot;body&quot; returns whether or</span></div><div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;<span class="comment">// not to continue looping (as well as any other processing necessary</span></div><div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;<span class="comment">// of course). You can think of this synchronously as:</span></div><div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;<span class="comment">//</span></div><div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;<span class="comment">//     bool condition = true;</span></div><div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;<span class="comment">//     do {</span></div><div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;<span class="comment">//       condition = body(iterate());</span></div><div class="line"><a name="l00055">
 </a><span class="lineno">   55</span>&#160;<span class="comment">//     } while (condition);</span></div><div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;<span class="comment">//</span></div><div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;<span class="comment">// Asynchronously using recursion this might look like:</span></div><div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;<span class="comment">//</span></div><div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;<span class="comment">//     Future&lt;Nothing&gt; loop()</span></div><div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;<span class="comment">//     {</span></div><div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;<span class="comment">//       return iterate()</span></div><div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;<span cla
 ss="comment">//         .then([](T t) {</span></div><div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;<span class="comment">//            return body(t)</span></div><div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;<span class="comment">//             .then([](bool condition) {</span></div><div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;<span class="comment">//               if (condition) {</span></div><div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;<span class="comment">//                 return loop();</span></div><div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;<span class="comment">//               } else {</span></div><div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;<span class="comment">//                 return Nothing();</span></div><div class="line"><a name="l00069"></a><span class="lineno">   69</span
 >&#160;<span class="comment">//               }</span></div><div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;<span class="comment">//             });</span></div><div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;<span class="comment">//         });</span></div><div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;<span class="comment">//     }</span></div><div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;<span class="comment">//</span></div><div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;<span class="comment">// And asynchronously using `pid` as the execution context:</span></div><div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160;<span class="comment">//</span></div><div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;<span class="comment">//     Future&lt;Nothing&gt; loop()</span></div><div cla
 ss="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;<span class="comment">//     {</span></div><div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160;<span class="comment">//       return iterate()</span></div><div class="line"><a name="l00079"></a><span class="lineno">   79</span>&#160;<span class="comment">//         .then(defer(pid, [](T t) {</span></div><div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;<span class="comment">//            return body(t)</span></div><div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;<span class="comment">//             .then(defer(pid, [](bool condition) {</span></div><div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;<span class="comment">//               if (condition) {</span></div><div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;<span class="comment">//                 return loop();</span></di
 v><div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;<span class="comment">//               } else {</span></div><div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;<span class="comment">//                 return Nothing();</span></div><div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;<span class="comment">//               }</span></div><div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;<span class="comment">//             }));</span></div><div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160;<span class="comment">//         }));</span></div><div class="line"><a name="l00089"></a><span class="lineno">   89</span>&#160;<span class="comment">//     }</span></div><div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160;<span class="comment">//</span></div><div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;<sp
 an class="comment">// And now what this looks like using `loop`:</span></div><div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;<span class="comment">//</span></div><div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160;<span class="comment">//     loop(pid,</span></div><div class="line"><a name="l00094"></a><span class="lineno">   94</span>&#160;<span class="comment">//          []() {</span></div><div class="line"><a name="l00095"></a><span class="lineno">   95</span>&#160;<span class="comment">//            return iterate();</span></div><div class="line"><a name="l00096"></a><span class="lineno">   96</span>&#160;<span class="comment">//          },</span></div><div class="line"><a name="l00097"></a><span class="lineno">   97</span>&#160;<span class="comment">//          [](T t) {</span></div><div class="line"><a name="l00098"></a><span class="lineno">   98</span>&#160;<span class="comment">//            return body(t);</span></di
 v><div class="line"><a name="l00099"></a><span class="lineno">   99</span>&#160;<span class="comment">//          });</span></div><div class="line"><a name="l00100"></a><span class="lineno">  100</span>&#160;<span class="comment">//</span></div><div class="line"><a name="l00101"></a><span class="lineno">  101</span>&#160;<span class="comment">// One difference between the `loop` version of the &quot;body&quot; versus the</span></div><div class="line"><a name="l00102"></a><span class="lineno">  102</span>&#160;<span class="comment">// other non-loop examples above is the return value is not `bool` or</span></div><div class="line"><a name="l00103"></a><span class="lineno">  103</span>&#160;<span class="comment">// `Future&lt;bool&gt;` but rather `ControlFlow&lt;V&gt;` or</span></div><div class="line"><a name="l00104"></a><span class="lineno">  104</span>&#160;<span class="comment">// `Future&lt;ControlFlow&lt;V&gt;&gt;`. This enables you to return values out of</span></div><div class=
 "line"><a name="l00105"></a><span class="lineno">  105</span>&#160;<span class="comment">// the loop via a `Break(...)`, for example:</span></div><div class="line"><a name="l00106"></a><span class="lineno">  106</span>&#160;<span class="comment">//</span></div><div class="line"><a name="l00107"></a><span class="lineno">  107</span>&#160;<span class="comment">//     loop(pid,</span></div><div class="line"><a name="l00108"></a><span class="lineno">  108</span>&#160;<span class="comment">//          []() {</span></div><div class="line"><a name="l00109"></a><span class="lineno">  109</span>&#160;<span class="comment">//            return iterate();</span></div><div class="line"><a name="l00110"></a><span class="lineno">  110</span>&#160;<span class="comment">//          },</span></div><div class="line"><a name="l00111"></a><span class="lineno">  111</span>&#160;<span class="comment">//          [](T t) {</span></div><div class="line"><a name="l00112"></a><span class="lineno">  112</span
 >&#160;<span class="comment">//            if (finished(t)) {</span></div><div class="line"><a name="l00113"></a><span class="lineno">  113</span>&#160;<span class="comment">//              return Break(SomeValue());</span></div><div class="line"><a name="l00114"></a><span class="lineno">  114</span>&#160;<span class="comment">//            }</span></div><div class="line"><a name="l00115"></a><span class="lineno">  115</span>&#160;<span class="comment">//            return Continue();</span></div><div class="line"><a name="l00116"></a><span class="lineno">  116</span>&#160;<span class="comment">//          });</span></div><div class="line"><a name="l00117"></a><span class="lineno">  117</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> Iterate,</div><div class="line"><a name="l00118"></a><span class="lineno">  118</span>&#160;          <span class="keyword">typename</span> Body,</div><div class="line"><a name="l00119"></a><span class="lineno
 ">  119</span>&#160;          <span class="keyword">typename</span> T = <span class="keyword">typename</span> <a class="code" href="structprocess_1_1internal_1_1unwrap.html#a42055ebfe5f79c5139c8811f9866cce9">internal::unwrap&lt;typename result_of&lt;Iterate()&gt;::type</a>&gt;<a class="code" href="namespacemesos_1_1internal_1_1fs.html#a2343e2642db514496ba8380776487fba">::type</a>, <span class="comment">// NOLINT(whitespace/line_length)</span></div><div class="line"><a name="l00120"></a><span class="lineno">  120</span>&#160;          <span class="keyword">typename</span> CF = <span class="keyword">typename</span> <a class="code" href="structprocess_1_1internal_1_1unwrap.html#a42055ebfe5f79c5139c8811f9866cce9">internal::unwrap&lt;typename result_of&lt;Body(T)&gt;::type</a>&gt;<a class="code" href="namespacemesos_1_1internal_1_1fs.html#a2343e2642db514496ba8380776487fba">::type</a>, <span class="comment">// NOLINT(whitespace/line_length)</span></div><div class="line"><a name="l00121"><
 /a><span class="lineno">  121</span>&#160;          <span class="keyword">typename</span> V = <span class="keyword">typename</span> CF::ValueType&gt;</div><div class="line"><a name="l00122"></a><span class="lineno">  122</span>&#160;Future&lt;V&gt; <a class="code" href="namespaceprocess.html#a59c192ee8ea5abbbee1642957f47c92a">loop</a>(<span class="keyword">const</span> <a class="code" href="classOption.html">Option&lt;UPID&gt;</a>&amp; pid, Iterate&amp;&amp; iterate, Body&amp;&amp; body);</div><div class="line"><a name="l00123"></a><span class="lineno">  123</span>&#160;</div><div class="line"><a name="l00124"></a><span class="lineno">  124</span>&#160;</div><div class="line"><a name="l00125"></a><span class="lineno">  125</span>&#160;<span class="comment">// A helper for `loop` which creates a Process for us to provide an</span></div><div class="line"><a name="l00126"></a><span class="lineno">  126</span>&#160;<span class="comment">// execution context for running the loop.</span><
 /div><div class="line"><a name="l00127"></a><span class="lineno">  127</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> Iterate,</div><div class="line"><a name="l00128"></a><span class="lineno">  128</span>&#160;          <span class="keyword">typename</span> Body,</div><div class="line"><a name="l00129"></a><span class="lineno">  129</span>&#160;          <span class="keyword">typename</span> T = <span class="keyword">typename</span> <a class="code" href="structprocess_1_1internal_1_1unwrap.html#a42055ebfe5f79c5139c8811f9866cce9">internal::unwrap&lt;typename result_of&lt;Iterate()&gt;::type</a>&gt;<a class="code" href="namespacemesos_1_1internal_1_1fs.html#a2343e2642db514496ba8380776487fba">::type</a>, <span class="comment">// NOLINT(whitespace/line_length)</span></div><div class="line"><a name="l00130"></a><span class="lineno">  130</span>&#160;          <span class="keyword">typename</span> CF = <span class="keyword">typename</span> <a c
 lass="code" href="structprocess_1_1internal_1_1unwrap.html#a42055ebfe5f79c5139c8811f9866cce9">internal::unwrap&lt;typename result_of&lt;Body(T)&gt;::type</a>&gt;<a class="code" href="namespacemesos_1_1internal_1_1fs.html#a2343e2642db514496ba8380776487fba">::type</a>, <span class="comment">// NOLINT(whitespace/line_length)</span></div><div class="line"><a name="l00131"></a><span class="lineno">  131</span>&#160;          <span class="keyword">typename</span> V = <span class="keyword">typename</span> CF::ValueType&gt;</div><div class="line"><a name="l00132"></a><span class="lineno"><a class="line" href="namespaceprocess.html#af4f4d3422eed6d82ea5af4a1a6e839a4">  132</a></span>&#160;<a class="code" href="classprocess_1_1Future.html">Future&lt;V&gt;</a> <a class="code" href="namespaceprocess.html#a59c192ee8ea5abbbee1642957f47c92a">loop</a>(Iterate&amp;&amp; iterate, Body&amp;&amp; body)</div><div class="line"><a name="l00133"></a><span class="lineno">  133</span>&#160;{</div><div class="
 line"><a name="l00134"></a><span class="lineno">  134</span>&#160;  <span class="comment">// Have libprocess own and free the new `ProcessBase`.</span></div><div class="line"><a name="l00135"></a><span class="lineno">  135</span>&#160;  <a class="code" href="structprocess_1_1UPID.html">UPID</a> <a class="code" href="namespaceprocess.html">process</a> = <a class="code" href="namespaceprocess.html#aff22904a83567125d3b4d0d88e5a2270">spawn</a>(<span class="keyword">new</span> <a class="code" href="classprocess_1_1ProcessBase.html">ProcessBase</a>(), <span class="keyword">true</span>);</div><div class="line"><a name="l00136"></a><span class="lineno">  136</span>&#160;</div><div class="line"><a name="l00137"></a><span class="lineno">  137</span>&#160;  <span class="keywordflow">return</span> loop&lt;Iterate, Body, T, CF, V&gt;(</div><div class="line"><a name="l00138"></a><span class="lineno">  138</span>&#160;      <a class="code" href="namespaceos.html#ae19e4161a51b86a1f330f3bf1dc75389">
 process</a>,</div><div class="line"><a name="l00139"></a><span class="lineno">  139</span>&#160;      std::forward&lt;Iterate&gt;(iterate),</div><div class="line"><a name="l00140"></a><span class="lineno">  140</span>&#160;      std::forward&lt;Body&gt;(body))</div><div class="line"><a name="l00141"></a><span class="lineno">  141</span>&#160;    .onAny([=]() {</div><div class="line"><a name="l00142"></a><span class="lineno">  142</span>&#160;      <a class="code" href="namespaceprocess.html#a20443908afa3212215166e26065349e5">terminate</a>(process);</div><div class="line"><a name="l00143"></a><span class="lineno">  143</span>&#160;      <span class="comment">// NOTE: no need to `wait` or `delete` since the `spawn` above</span></div><div class="line"><a name="l00144"></a><span class="lineno">  144</span>&#160;      <span class="comment">// put libprocess in control of garbage collection.</span></div><div class="line"><a name="l00145"></a><span class="lineno">  145</span>&#160;    });<
 /div><div class="line"><a name="l00146"></a><span class="lineno">  146</span>&#160;}</div><div class="line"><a name="l00147"></a><span class="lineno">  147</span>&#160;</div><div class="line"><a name="l00148"></a><span class="lineno">  148</span>&#160;</div><div class="line"><a name="l00149"></a><span class="lineno">  149</span>&#160;<span class="comment">// Generic &quot;control flow&quot; construct that is leveraged by</span></div><div class="line"><a name="l00150"></a><span class="lineno">  150</span>&#160;<span class="comment">// implementations such as `loop`. At a high-level a `ControlFlow`</span></div><div class="line"><a name="l00151"></a><span class="lineno">  151</span>&#160;<span class="comment">// represents some control flow statement such as `continue` or</span></div><div class="line"><a name="l00152"></a><span class="lineno">  152</span>&#160;<span class="comment">// `break`, however, these statements can both have values or be</span></div><div class="line"><a name="l
 00153"></a><span class="lineno">  153</span>&#160;<span class="comment">// value-less (i.e., these are meant to be composed &quot;functionally&quot; so</span></div><div class="line"><a name="l00154"></a><span class="lineno">  154</span>&#160;<span class="comment">// the representation of `break` captures a value that &quot;exits the</span></div><div class="line"><a name="l00155"></a><span class="lineno">  155</span>&#160;<span class="comment">// current function&quot; but the representation of `continue` does not).</span></div><div class="line"><a name="l00156"></a><span class="lineno">  156</span>&#160;<span class="comment">//</span></div><div class="line"><a name="l00157"></a><span class="lineno">  157</span>&#160;<span class="comment">// The pattern here is to define the type/representation of control</span></div><div class="line"><a name="l00158"></a><span class="lineno">  158</span>&#160;<span class="comment">// flow statements within the `ControlFlow` class (e.g.,</span></div>
 <div class="line"><a name="l00159"></a><span class="lineno">  159</span>&#160;<span class="comment">// `ControlFlow::Continue` and `ControlFlow::Break`) but also provide</span></div><div class="line"><a name="l00160"></a><span class="lineno">  160</span>&#160;<span class="comment">// &quot;syntactic sugar&quot; to make it easier to use at the call site (e.g.,</span></div><div class="line"><a name="l00161"></a><span class="lineno">  161</span>&#160;<span class="comment">// the functions `Continue()` and `Break(...)`).</span></div><div class="line"><a name="l00162"></a><span class="lineno">  162</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;</div><div class="line"><a name="l00163"></a><span class="lineno"><a class="line" href="classprocess_1_1ControlFlow.html">  163</a></span>&#160;<span class="keyword">class </span><a class="code" href="classprocess_1_1ControlFlow.html">ControlFlow</a></div><div class="line"><a name="l00164"></a><spa
 n class="lineno">  164</span>&#160;{</div><div class="line"><a name="l00165"></a><span class="lineno">  165</span>&#160;<span class="keyword">public</span>:</div><div class="line"><a name="l00166"></a><span class="lineno"><a class="line" href="classprocess_1_1ControlFlow.html#a5ce1f085b8043fe8ac900ce9f63a0bde">  166</a></span>&#160;  <span class="keyword">using</span> <a class="code" href="classprocess_1_1ControlFlow.html#a5ce1f085b8043fe8ac900ce9f63a0bde">ValueType</a> = T;</div><div class="line"><a name="l00167"></a><span class="lineno">  167</span>&#160;</div><div class="line"><a name="l00168"></a><span class="lineno"><a class="line" href="classprocess_1_1ControlFlow.html#af212ef291f73ba2e7b37586a577a794b">  168</a></span>&#160;  <span class="keyword">enum class</span> <a class="code" href="classprocess_1_1ControlFlow.html#af212ef291f73ba2e7b37586a577a794b">Statement</a></div><div class="line"><a name="l00169"></a><span class="lineno">  169</span>&#160;  {</div><div class="line">
 <a name="l00170"></a><span class="lineno">  170</span>&#160;    <a class="code" href="classprocess_1_1ControlFlow.html#af212ef291f73ba2e7b37586a577a794ba2f453cfe638e57e27bb0c9512436111e">CONTINUE</a>,</div><div class="line"><a name="l00171"></a><span class="lineno">  171</span>&#160;    <a class="code" href="classprocess_1_1ControlFlow.html#af212ef291f73ba2e7b37586a577a794ba14d6a3e0201f58bfe7c01e775973e80e">BREAK</a></div><div class="line"><a name="l00172"></a><span class="lineno">  172</span>&#160;  };</div><div class="line"><a name="l00173"></a><span class="lineno">  173</span>&#160;</div><div class="line"><a name="l00174"></a><span class="lineno"><a class="line" href="classprocess_1_1ControlFlow_1_1Continue.html">  174</a></span>&#160;  <span class="keyword">class </span><a class="code" href="classprocess_1_1ControlFlow_1_1Continue.html">Continue</a></div><div class="line"><a name="l00175"></a><span class="lineno">  175</span>&#160;  {</div><div class="line"><a name="l00176"></a>
 <span class="lineno">  176</span>&#160;  <span class="keyword">public</span>:</div><div class="line"><a name="l00177"></a><span class="lineno">  177</span>&#160;    <a class="code" href="classprocess_1_1ControlFlow_1_1Continue.html">Continue</a>() = <span class="keywordflow">default</span>;</div><div class="line"><a name="l00178"></a><span class="lineno">  178</span>&#160;</div><div class="line"><a name="l00179"></a><span class="lineno">  179</span>&#160;    <span class="keyword">template</span> &lt;<span class="keyword">typename</span> U&gt;</div><div class="line"><a name="l00180"></a><span class="lineno"><a class="line" href="classprocess_1_1ControlFlow_1_1Continue.html#a8e1e336f8fa06958501963292a31164f">  180</a></span>&#160;    <span class="keyword">operator</span> <a class="code" href="classprocess_1_1ControlFlow.html">ControlFlow&lt;U&gt;</a>() <span class="keyword">const</span></div><div class="line"><a name="l00181"></a><span class="lineno">  181</span>&#160;    {</div><div 
 class="line"><a name="l00182"></a><span class="lineno">  182</span>&#160;      <span class="keywordflow">return</span> <a class="code" href="classprocess_1_1ControlFlow.html">ControlFlow&lt;U&gt;</a>(<a class="code" href="classprocess_1_1ControlFlow.html">ControlFlow&lt;U&gt;::Statement::CONTINUE</a>, <a class="code" href="structNone.html">None</a>());</div><div class="line"><a name="l00183"></a><span class="lineno">  183</span>&#160;    }</div><div class="line"><a name="l00184"></a><span class="lineno">  184</span>&#160;  };</div><div class="line"><a name="l00185"></a><span class="lineno">  185</span>&#160;</div><div class="line"><a name="l00186"></a><span class="lineno"><a class="line" href="classprocess_1_1ControlFlow_1_1Break.html">  186</a></span>&#160;  <span class="keyword">class </span><a class="code" href="classprocess_1_1ControlFlow_1_1Break.html">Break</a></div><div class="line"><a name="l00187"></a><span class="lineno">  187</span>&#160;  {</div><div class="line"><a name
 ="l00188"></a><span class="lineno">  188</span>&#160;  <span class="keyword">public</span>:</div><div class="line"><a name="l00189"></a><span class="lineno"><a class="line" href="classprocess_1_1ControlFlow_1_1Break.html#af7fb2876b55483e08e446e4206695eca">  189</a></span>&#160;    <a class="code" href="classprocess_1_1ControlFlow_1_1Break.html#af7fb2876b55483e08e446e4206695eca">Break</a>(T t) : t(<a class="code" href="namespacestd.html">std</a>::move(t)) {}</div><div class="line"><a name="l00190"></a><span class="lineno">  190</span>&#160;</div><div class="line"><a name="l00191"></a><span class="lineno">  191</span>&#160;    <span class="keyword">template</span> &lt;<span class="keyword">typename</span> U&gt;</div><div class="line"><a name="l00192"></a><span class="lineno"><a class="line" href="classprocess_1_1ControlFlow_1_1Break.html#ae47dc27fa4845951a7088286131686e0">  192</a></span>&#160;    <span class="keyword">operator</span> <a class="code" href="classprocess_1_1ControlFlow.
 html">ControlFlow&lt;U&gt;</a>() <span class="keyword">const</span> &amp;</div><div class="line"><a name="l00193"></a><span class="lineno">  193</span>&#160;    {</div><div class="line"><a name="l00194"></a><span class="lineno">  194</span>&#160;      <span class="keywordflow">return</span> <a class="code" href="classprocess_1_1ControlFlow.html">ControlFlow&lt;U&gt;</a>(<a class="code" href="classprocess_1_1ControlFlow.html">ControlFlow&lt;U&gt;::Statement::BREAK</a>, t);</div><div class="line"><a name="l00195"></a><span class="lineno">  195</span>&#160;    }</div><div class="line"><a name="l00196"></a><span class="lineno">  196</span>&#160;</div><div class="line"><a name="l00197"></a><span class="lineno">  197</span>&#160;    <span class="keyword">template</span> &lt;<span class="keyword">typename</span> U&gt;</div><div class="line"><a name="l00198"></a><span class="lineno"><a class="line" href="classprocess_1_1ControlFlow_1_1Break.html#afcbd83a411d73d75ba2fc300aa1b20f4">  198</a><
 /span>&#160;    <span class="keyword">operator</span> <a class="code" href="classprocess_1_1ControlFlow.html">ControlFlow&lt;U&gt;</a>() &amp;&amp;</div><div class="line"><a name="l00199"></a><span class="lineno">  199</span>&#160;    {</div><div class="line"><a name="l00200"></a><span class="lineno">  200</span>&#160;      <span class="keywordflow">return</span> <a class="code" href="classprocess_1_1ControlFlow.html">ControlFlow&lt;U&gt;</a>(<a class="code" href="classprocess_1_1ControlFlow.html">ControlFlow&lt;U&gt;::Statement::BREAK</a>, std::move(t));</div><div class="line"><a name="l00201"></a><span class="lineno">  201</span>&#160;    }</div><div class="line"><a name="l00202"></a><span class="lineno">  202</span>&#160;</div><div class="line"><a name="l00203"></a><span class="lineno">  203</span>&#160;  <span class="keyword">private</span>:</div><div class="line"><a name="l00204"></a><span class="lineno">  204</span>&#160;    T t;</div><div class="line"><a name="l00205"></a><sp
 an class="lineno">  205</span>&#160;  };</div><div class="line"><a name="l00206"></a><span class="lineno">  206</span>&#160;</div><div class="line"><a name="l00207"></a><span class="lineno"><a class="line" href="classprocess_1_1ControlFlow.html#ad8f5968ae93a1c00cfd67964c7895260">  207</a></span>&#160;  <a class="code" href="classprocess_1_1ControlFlow.html#ad8f5968ae93a1c00cfd67964c7895260">ControlFlow</a>(<a class="code" href="classprocess_1_1ControlFlow.html#af212ef291f73ba2e7b37586a577a794b">Statement</a> s, <a class="code" href="classOption.html">Option&lt;T&gt;</a> t) : s(s), t(<a class="code" href="namespacestd.html">std</a>::move(t)) {}</div><div class="line"><a name="l00208"></a><span class="lineno">  208</span>&#160;</div><div class="line"><a name="l00209"></a><span class="lineno"><a class="line" href="classprocess_1_1ControlFlow.html#a34752a25284d038dc5d4d9e551424cfe">  209</a></span>&#160;  <a class="code" href="classprocess_1_1ControlFlow.html#af212ef291f73ba2e7b37586a57
 7a794b">Statement</a> <a class="code" href="classprocess_1_1ControlFlow.html#a34752a25284d038dc5d4d9e551424cfe">statement</a>()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> s; }</div><div class="line"><a name="l00210"></a><span class="lineno">  210</span>&#160;</div><div class="line"><a name="l00211"></a><span class="lineno"><a class="line" href="classprocess_1_1ControlFlow.html#a5c21809a15f9efe012e30d1a1cf05c3a">  211</a></span>&#160;  T&amp; <a class="code" href="classprocess_1_1ControlFlow.html#a5c21809a15f9efe012e30d1a1cf05c3a">value</a>() &amp; { <span class="keywordflow">return</span> t.get(); }</div><div class="line"><a name="l00212"></a><span class="lineno"><a class="line" href="classprocess_1_1ControlFlow.html#ad0fbad53169fc7766d61a69393ac14bc">  212</a></span>&#160;  <span class="keyword">const</span> T&amp; <a class="code" href="classprocess_1_1ControlFlow.html#ad0fbad53169fc7766d61a69393ac14bc">value</a>() const &amp; { <span class="keywor
 dflow">return</span> t.get(); }</div><div class="line"><a name="l00213"></a><span class="lineno"><a class="line" href="classprocess_1_1ControlFlow.html#a3a15eba61473df457b0ac4cbaddd21ed">  213</a></span>&#160;  T&amp;&amp; <a class="code" href="classprocess_1_1ControlFlow.html#a3a15eba61473df457b0ac4cbaddd21ed">value</a>() &amp;&amp; { <span class="keywordflow">return</span> t.get(); }</div><div class="line"><a name="l00214"></a><span class="lineno"><a class="line" href="classprocess_1_1ControlFlow.html#a9fa0744c29d7bffd54f10aea580ba187">  214</a></span>&#160;  <span class="keyword">const</span> T&amp;&amp; <a class="code" href="classprocess_1_1ControlFlow.html#a9fa0744c29d7bffd54f10aea580ba187">value</a>() const &amp;&amp; { <span class="keywordflow">return</span> t.get(); }</div><div class="line"><a name="l00215"></a><span class="lineno">  215</span>&#160;</div><div class="line"><a name="l00216"></a><span class="lineno">  216</span>&#160;<span class="keyword">private</span>:</div>
 <div class="line"><a name="l00217"></a><span class="lineno">  217</span>&#160;  <a class="code" href="classprocess_1_1ControlFlow.html#af212ef291f73ba2e7b37586a577a794b">Statement</a> s;</div><div class="line"><a name="l00218"></a><span class="lineno">  218</span>&#160;  <a class="code" href="classOption.html">Option&lt;T&gt;</a> t;</div><div class="line"><a name="l00219"></a><span class="lineno">  219</span>&#160;};</div><div class="line"><a name="l00220"></a><span class="lineno">  220</span>&#160;</div><div class="line"><a name="l00221"></a><span class="lineno">  221</span>&#160;</div><div class="line"><a name="l00222"></a><span class="lineno">  222</span>&#160;<span class="comment">// Provides &quot;syntactic sugar&quot; for creating a `ControlFlow::Continue`.</span></div><div class="line"><a name="l00223"></a><span class="lineno"><a class="line" href="structprocess_1_1Continue.html">  223</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structprocess_1_1
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 lass="line"><a name="l00230"></a><span class="lineno">  230</span>&#160;    <span class="keywordflow">return</span> <span class="keyword">typename</span> <a class="code" href="classprocess_1_1ControlFlow_1_1Continue.html">ControlFlow&lt;T&gt;::Continue</a>();</div><div class="line"><a name="l00231"></a><span class="lineno">  231</span>&#160;  }</div><div class="line"><a name="l00232"></a><span class="lineno">  232</span>&#160;};</div><div class="line"><a name="l00233"></a><span class="lineno">  233</span>&#160;</div><div class="line"><a name="l00234"></a><span class="lineno">  234</span>&#160;</div><div class="line"><a name="l00235"></a><span class="lineno">  235</span>&#160;<span class="comment">// Provides &quot;syntactic sugar&quot; for creating a `ControlFlow::Break`.</span></div><div class="line"><a name="l00236"></a><span class="lineno">  236</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;</div><div class="line"><a name="l00237
 "></a><span class="lineno"><a class="line" href="namespaceprocess.html#a4beae62da50c26c6cb8afd14e385d0c8">  237</a></span>&#160;<span class="keyword">typename</span> <a class="code" href="classprocess_1_1ControlFlow.html">ControlFlow&lt;typename std::decay&lt;T&gt;::type</a>&gt;<a class="code" href="namespaceprocess.html#a4beae62da50c26c6cb8afd14e385d0c8">::Break</a> <a class="code" href="namespaceprocess.html#a4beae62da50c26c6cb8afd14e385d0c8">Break</a>(T&amp;&amp; t)</div><div class="line"><a name="l00238"></a><span class="lineno">  238</span>&#160;{</div><div class="line"><a name="l00239"></a><span class="lineno">  239</span>&#160;  <span class="keywordflow">return</span> <span class="keyword">typename</span> <a class="code" href="classprocess_1_1ControlFlow.html">ControlFlow&lt;typename std::decay&lt;T&gt;::type</a>&gt;<a class="code" href="namespaceprocess.html#a4beae62da50c26c6cb8afd14e385d0c8">::Break</a>(</div><div class="line"><a name="l00240"></a><span class="lineno">  240
 </span>&#160;      std::forward&lt;T&gt;(t));</div><div class="line"><a name="l00241"></a><span class="lineno">  241</span>&#160;}</div><div class="line"><a name="l00242"></a><span class="lineno">  242</span>&#160;</div><div class="line"><a name="l00243"></a><span class="lineno">  243</span>&#160;</div><div class="line"><a name="l00244"></a><span class="lineno"><a class="line" href="namespaceprocess.html#a7a61f12f614ea8c61821e61682c4bfb9">  244</a></span>&#160;<span class="keyword">inline</span> <a class="code" href="classprocess_1_1ControlFlow_1_1Break.html">ControlFlow&lt;Nothing&gt;::Break</a> <a class="code" href="namespaceprocess.html#a4beae62da50c26c6cb8afd14e385d0c8">Break</a>()</div><div class="line"><a name="l00245"></a><span class="lineno">  245</span>&#160;{</div><div class="line"><a name="l00246"></a><span class="lineno">  246</span>&#160;  <span class="keywordflow">return</span> <a class="code" href="namespaceprocess.html#a7a61f12f614ea8c61821e61682c4bfb9">ControlFlow&l
 t;Nothing&gt;::Break</a>(<a class="code" href="structNothing.html">Nothing</a>());</div><div class="line"><a name="l00247"></a><span class="lineno">  247</span>&#160;}</div><div class="line"><a name="l00248"></a><span class="lineno">  248</span>&#160;</div><div class="line"><a name="l00249"></a><span class="lineno">  249</span>&#160;</div><div class="line"><a name="l00250"></a><span class="lineno">  250</span>&#160;<span class="keyword">namespace </span><a class="code" href="namespaceinternal.html">internal</a> {</div><div class="line"><a name="l00251"></a><span class="lineno">  251</span>&#160;</div><div class="line"><a name="l00252"></a><span class="lineno">  252</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> Iterate, <span class="keyword">typename</span> Body, <span class="keyword">typename</span> T, <span class="keyword">typename</span> R&gt;</div><div class="line"><a name="l00253"></a><span class="lineno"><a class="line" href="classp
 rocess_1_1internal_1_1Loop.html">  253</a></span>&#160;<span class="keyword">class </span><a class="code" href="classprocess_1_1internal_1_1Loop.html">Loop</a> : <span class="keyword">public</span> std::enable_shared_from_this&lt;Loop&lt;Iterate, Body, T, R&gt;&gt;</div><div class="line"><a name="l00254"></a><span class="lineno">  254</span>&#160;{</div><div class="line"><a name="l00255"></a><span class="lineno">  255</span>&#160;<span class="keyword">public</span>:</div><div class="line"><a name="l00256"></a><span class="lineno">  256</span>&#160;  <span class="keyword">template</span> &lt;<span class="keyword">typename</span> Iterate_, <span class="keyword">typename</span> Body_&gt;</div><div class="line"><a name="l00257"></a><span class="lineno"><a class="line" href="classprocess_1_1internal_1_1Loop.html#a4067cc276cd8152074a7094acf9ca451">  257</a></span>&#160;  <span class="keyword">static</span> std::shared_ptr&lt;Loop&gt; <a class="code" href="classprocess_1_1internal_1_1Loop.
 html#a4067cc276cd8152074a7094acf9ca451">create</a>(</div><div class="line"><a name="l00258"></a><span class="lineno">  258</span>&#160;      <span class="keyword">const</span> <a class="code" href="classOption.html">Option&lt;UPID&gt;</a>&amp; pid,</div><div class="line"><a name="l00259"></a><span class="lineno">  259</span>&#160;      Iterate_&amp;&amp; iterate,</div><div class="line"><a name="l00260"></a><span class="lineno">  260</span>&#160;      Body_&amp;&amp; body)</div><div class="line"><a name="l00261"></a><span class="lineno">  261</span>&#160;  {</div><div class="line"><a name="l00262"></a><span class="lineno">  262</span>&#160;    <span class="keywordflow">return</span> std::shared_ptr&lt;Loop&gt;(</div><div class="line"><a name="l00263"></a><span class="lineno">  263</span>&#160;        <span class="keyword">new</span> <a class="code" href="classprocess_1_1internal_1_1Loop.html">Loop</a>(</div><div class="line"><a name="l00264"></a><span class="lineno">  264</span>&#160
 ;            pid,</div><div class="line"><a name="l00265"></a><span class="lineno">  265</span>&#160;            std::forward&lt;Iterate_&gt;(iterate),</div><div class="line"><a name="l00266"></a><span class="lineno">  266</span>&#160;            std::forward&lt;Body_&gt;(body)));</div><div class="line"><a name="l00267"></a><span class="lineno">  267</span>&#160;  }</div><div class="line"><a name="l00268"></a><span class="lineno">  268</span>&#160;</div><div class="line"><a name="l00269"></a><span class="lineno"><a class="line" href="classprocess_1_1internal_1_1Loop.html#a9923c05dd6d27f9ec0c61d28a5387641">  269</a></span>&#160;  std::shared_ptr&lt;Loop&gt; <a class="code" href="classprocess_1_1internal_1_1Loop.html#a9923c05dd6d27f9ec0c61d28a5387641">shared</a>()</div><div class="line"><a name="l00270"></a><span class="lineno">  270</span>&#160;  {</div><div class="line"><a name="l00271"></a><span class="lineno">  271</span>&#160;    <span class="comment">// Must fully specify `share
 d_from_this` because we&#39;re templated.</span></div><div class="line"><a name="l00272"></a><span class="lineno">  272</span>&#160;    <span class="keywordflow">return</span> std::enable_shared_from_this&lt;Loop&gt;::shared_from_this();</div><div class="line"><a name="l00273"></a><span class="lineno">  273</span>&#160;  }</div><div class="line"><a name="l00274"></a><span class="lineno">  274</span>&#160;</div><div class="line"><a name="l00275"></a><span class="lineno"><a class="line" href="classprocess_1_1internal_1_1Loop.html#a39870dcf4e2432a29569a658ec0e33be">  275</a></span>&#160;  std::weak_ptr&lt;Loop&gt; <a class="code" href="classprocess_1_1internal_1_1Loop.html#a39870dcf4e2432a29569a658ec0e33be">weak</a>()</div><div class="line"><a name="l00276"></a><span class="lineno">  276</span>&#160;  {</div><div class="line"><a name="l00277"></a><span class="lineno">  277</span>&#160;    <span class="keywordflow">return</span> std::weak_ptr&lt;Loop&gt;(shared());</div><div class="line
 "><a name="l00278"></a><span class="lineno">  278</span>&#160;  }</div><div class="line"><a name="l00279"></a><span class="lineno">  279</span>&#160;</div><div class="line"><a name="l00280"></a><span class="lineno"><a class="line" href="classprocess_1_1internal_1_1Loop.html#a4743d5b323d0d9923cd83fd1abeda9c3">  280</a></span>&#160;  <a class="code" href="classprocess_1_1Future.html">Future&lt;R&gt;</a> <a class="code" href="classprocess_1_1internal_1_1Loop.html#a4743d5b323d0d9923cd83fd1abeda9c3">start</a>()</div><div class="line"><a name="l00281"></a><span class="lineno">  281</span>&#160;  {</div><div class="line"><a name="l00282"></a><span class="lineno">  282</span>&#160;    <span class="keyword">auto</span> <span class="keyword">self</span> = shared();</div><div class="line"><a name="l00283"></a><span class="lineno">  283</span>&#160;    <span class="keyword">auto</span> weak_self = weak();</div><div class="line"><a name="l00284"></a><span class="lineno">  284</span>&#160;</div><
 div class="line"><a name="l00285"></a><span class="lineno">  285</span>&#160;    <span class="comment">// Propagating discards:</span></div><div class="line"><a name="l00286"></a><span class="lineno">  286</span>&#160;    <span class="comment">//</span></div><div class="line"><a name="l00287"></a><span class="lineno">  287</span>&#160;    <span class="comment">// When the caller does a discard we need to propagate it to</span></div><div class="line"><a name="l00288"></a><span class="lineno">  288</span>&#160;    <span class="comment">// either the future returned from `iterate` or the future</span></div><div class="line"><a name="l00289"></a><span class="lineno">  289</span>&#160;    <span class="comment">// returned from `body`. One easy way to do this would be to add</span></div><div class="line"><a name="l00290"></a><span class="lineno">  290</span>&#160;    <span class="comment">// an `onAny` callback for every future returned from `iterate`</span></div><div class="line"><a name
 ="l00291"></a><span class="lineno">  291</span>&#160;    <span class="comment">// and `body`, but that would be a slow memory leak that would</span></div><div class="line"><a name="l00292"></a><span class="lineno">  292</span>&#160;    <span class="comment">// grow over time, especially if the loop was actually</span></div><div class="line"><a name="l00293"></a><span class="lineno">  293</span>&#160;    <span class="comment">// infinite. Instead, we capture the current future that needs to</span></div><div class="line"><a name="l00294"></a><span class="lineno">  294</span>&#160;    <span class="comment">// be discarded within a `discard` function that we&#39;ll invoke when</span></div><div class="line"><a name="l00295"></a><span class="lineno">  295</span>&#160;    <span class="comment">// we get a discard. Because there is a race setting the `discard`</span></div><div class="line"><a name="l00296"></a><span class="lineno">  296</span>&#160;    <span class="comment">// function and 
 reading it out to invoke we have to synchronize</span></div><div class="line"><a name="l00297"></a><span class="lineno">  297</span>&#160;    <span class="comment">// access using a mutex. An alternative strategy would be to use</span></div><div class="line"><a name="l00298"></a><span class="lineno">  298</span>&#160;    <span class="comment">// something like `atomic_load` and `atomic_store` with</span></div><div class="line"><a name="l00299"></a><span class="lineno">  299</span>&#160;    <span class="comment">// `shared_ptr` so that we can swap the current future(s)</span></div><div class="line"><a name="l00300"></a><span class="lineno">  300</span>&#160;    <span class="comment">// atomically.</span></div><div class="line"><a name="l00301"></a><span class="lineno">  301</span>&#160;    <a class="code" href="namespacemesos_1_1internal_1_1log_1_1protocol.html#a3b1f8bd7b18c51af9d1f58842950b545">promise</a>.future().onDiscard([weak_self]() {</div><div class="line"><a name="l00302"></
 a><span class="lineno">  302</span>&#160;      <span class="keyword">auto</span> <span class="keyword">self</span> = weak_self.lock();</div><div class="line"><a name="l00303"></a><span class="lineno">  303</span>&#160;      <span class="keywordflow">if</span> (<span class="keyword">self</span>) {</div><div class="line"><a name="l00304"></a><span class="lineno">  304</span>&#160;        <span class="comment">// We need to make a copy of the current `discard` function so</span></div><div class="line"><a name="l00305"></a><span class="lineno">  305</span>&#160;        <span class="comment">// that we can invoke it outside of the `synchronized` block</span></div><div class="line"><a name="l00306"></a><span class="lineno">  306</span>&#160;        <span class="comment">// in the event that discarding invokes causes the `onAny`</span></div><div class="line"><a name="l00307"></a><span class="lineno">  307</span>&#160;        <span class="comment">// callbacks that we have added in `run` to
  execute which may</span></div><div class="line"><a name="l00308"></a><span class="lineno">  308</span>&#160;        <span class="comment">// deadlock attempting to re-acquire `mutex`!</span></div><div class="line"><a name="l00309"></a><span class="lineno">  309</span>&#160;        std::function&lt;void()&gt; <a class="code" href="namespaceprocess.html#a62d5333e8ec1817c249cf83e15d568b4">f</a> = []() {};</div><div class="line"><a name="l00310"></a><span class="lineno">  310</span>&#160;        <span class="keyword">synchronized</span> (<span class="keyword">self</span>-&gt;mutex) {</div><div class="line"><a name="l00311"></a><span class="lineno">  311</span>&#160;          f = <span class="keyword">self</span>-&gt;discard;</div><div class="line"><a name="l00312"></a><span class="lineno">  312</span>&#160;        }</div><div class="line"><a name="l00313"></a><span class="lineno">  313</span>&#160;        <a class="code" href="namespaceprocess.html#a62d5333e8ec1817c249cf83e15d568b4">f<
 /a>();</div><div class="line"><a name="l00314"></a><span class="lineno">  314</span>&#160;      }</div><div class="line"><a name="l00315"></a><span class="lineno">  315</span>&#160;    });</div><div class="line"><a name="l00316"></a><span class="lineno">  316</span>&#160;</div><div class="line"><a name="l00317"></a><span class="lineno">  317</span>&#160;    <span class="keywordflow">if</span> (pid.isSome()) {</div><div class="line"><a name="l00318"></a><span class="lineno">  318</span>&#160;      <span class="comment">// Start the loop using `pid` as the execution context.</span></div><div class="line"><a name="l00319"></a><span class="lineno">  319</span>&#160;      <a class="code" href="namespaceprocess.html#acfbc29404bc653268289691b0dd59e22">dispatch</a>(pid.get(), [<span class="keyword">self</span>]() {</div><div class="line"><a name="l00320"></a><span class="lineno">  320</span>&#160;        <span class="keyword">self</span>-&gt;run(self-&gt;iterate());</div><div class="line"><
 a name="l00321"></a><span class="lineno">  321</span>&#160;      });</div><div class="line"><a name="l00322"></a><span class="lineno">  322</span>&#160;</div><div class="line"><a name="l00323"></a><span class="lineno">  323</span>&#160;      <span class="comment">// TODO(benh): Link with `pid` so that we can discard or abandon</span></div><div class="line"><a name="l00324"></a><span class="lineno">  324</span>&#160;      <span class="comment">// the promise in the event `pid` terminates and didn&#39;t discard</span></div><div class="line"><a name="l00325"></a><span class="lineno">  325</span>&#160;      <span class="comment">// us so that we can avoid any leaks (memory or otherwise).</span></div><div class="line"><a name="l00326"></a><span class="lineno">  326</span>&#160;    } <span class="keywordflow">else</span> {</div><div class="line"><a name="l00327"></a><span class="lineno">  327</span>&#160;      <a class="code" href="namespaceprocess.html#a72c24f06ac3f91b9412de80c6252df25">
 run</a>(iterate());</div><div class="line"><a name="l00328"></a><span class="lineno">  328</span>&#160;    }</div><div class="line"><a name="l00329"></a><span class="lineno">  329</span>&#160;</div><div class="line"><a name="l00330"></a><span class="lineno">  330</span>&#160;    <span class="keywordflow">return</span> <a class="code" href="namespacemesos_1_1internal_1_1log_1_1protocol.html#a3b1f8bd7b18c51af9d1f58842950b545">promise</a>.future();</div><div class="line"><a name="l00331"></a><span class="lineno">  331</span>&#160;  }</div><div class="line"><a name="l00332"></a><span class="lineno">  332</span>&#160;</div><div class="line"><a name="l00333"></a><span class="lineno"><a class="line" href="classprocess_1_1internal_1_1Loop.html#a11417f29be6ae721ee9331b0ccbf16e4">  333</a></span>&#160;  <span class="keywordtype">void</span> <a class="code" href="classprocess_1_1internal_1_1Loop.html#a11417f29be6ae721ee9331b0ccbf16e4">run</a>(<a class="code" href="classprocess_1_1Future.html">
 Future&lt;T&gt;</a> next)</div><div class="line"><a name="l00334"></a><span class="lineno">  334</span>&#160;  {</div><div class="line"><a name="l00335"></a><span class="lineno">  335</span>&#160;    <span class="keyword">auto</span> <span class="keyword">self</span> = shared();</div><div class="line"><a name="l00336"></a><span class="lineno">  336</span>&#160;</div><div class="line"><a name="l00337"></a><span class="lineno">  337</span>&#160;    <span class="comment">// Reset `discard` so that we&#39;re not delaying cleanup of any</span></div><div class="line"><a name="l00338"></a><span class="lineno">  338</span>&#160;    <span class="comment">// captured futures longer than necessary.</span></div><div class="line"><a name="l00339"></a><span class="lineno">  339</span>&#160;    <span class="comment">//</span></div><div class="line"><a name="l00340"></a><span class="lineno">  340</span>&#160;    <span class="comment">// TODO(benh): Use `WeakFuture` in `discard` functions instead.</
 span></div><div class="line"><a name="l00341"></a><span class="lineno">  341</span>&#160;    <span class="keyword">synchronized</span> (mutex) {</div><div class="line"><a name="l00342"></a><span class="lineno">  342</span>&#160;      <a class="code" href="namespaceprocess.html#adc504b79a0e7ec7c4caa088a937d4feb">discard</a> = []() {};</div><div class="line"><a name="l00343"></a><span class="lineno">  343</span>&#160;    }</div><div class="line"><a name="l00344"></a><span class="lineno">  344</span>&#160;</div><div class="line"><a name="l00345"></a><span class="lineno">  345</span>&#160;    <span class="keywordflow">while</span> (next.<a class="code" href="classprocess_1_1Future.html#a68f241961e700d0cecf982d9cc0043d7">isReady</a>()) {</div><div class="line"><a name="l00346"></a><span class="lineno">  346</span>&#160;      <a class="code" href="classprocess_1_1Future.html">Future&lt;ControlFlow&lt;R&gt;</a>&gt; flow = body(next.<a class="code" href="classprocess_1_1Future.html#aa78977d
 3b585a5f5ccd682c1e9e2ddc4">get</a>());</div><div class="line"><a name="l00347"></a><span class="lineno">  347</span>&#160;      <span class="keywordflow">if</span> (flow.<a class="code" href="classprocess_1_1Future.html#a68f241961e700d0cecf982d9cc0043d7">isReady</a>()) {</div><div class="line"><a name="l00348"></a><span class="lineno">  348</span>&#160;        <span class="keywordflow">switch</span> (flow-&gt;statement()) {</div><div class="line"><a name="l00349"></a><span class="lineno">  349</span>&#160;          <span class="keywordflow">case</span> <a class="code" href="classprocess_1_1ControlFlow.html">ControlFlow&lt;R&gt;::Statement::CONTINUE</a>: {</div><div class="line"><a name="l00350"></a><span class="lineno">  350</span>&#160;            next = iterate();</div><div class="line"><a name="l00351"></a><span class="lineno">  351</span>&#160;            <span class="keywordflow">continue</span>;</div><div class="line"><a name="l00352"></a><span class="lineno">  352</span>&#160
 ;          }</div><div class="line"><a name="l00353"></a><span class="lineno">  353</span>&#160;          <span class="keywordflow">case</span> <a class="code" href="classprocess_1_1ControlFlow.html">ControlFlow&lt;R&gt;::Statement::BREAK</a>: {</div><div class="line"><a name="l00354"></a><span class="lineno">  354</span>&#160;            <a class="code" href="namespacemesos_1_1internal_1_1log_1_1protocol.html#a3b1f8bd7b18c51af9d1f58842950b545">promise</a>.set(flow-&gt;value());</div><div class="line"><a name="l00355"></a><span class="lineno">  355</span>&#160;            <span class="keywordflow">return</span>;</div><div class="line"><a name="l00356"></a><span class="lineno">  356</span>&#160;          }</div><div class="line"><a name="l00357"></a><span class="lineno">  357</span>&#160;        }</div><div class="line"><a name="l00358"></a><span class="lineno">  358</span>&#160;      } <span class="keywordflow">else</span> {</div><div class="line"><a name="l00359"></a><span class="l
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 d();</div><div class="line"><a name="l00375"></a><span class="lineno">  375</span>&#160;          }</div><div class="line"><a name="l00376"></a><span class="lineno">  376</span>&#160;        };</div><div class="line"><a name="l00377"></a><span class="lineno">  377</span>&#160;</div><div class="line"><a name="l00378"></a><span class="lineno">  378</span>&#160;        <span class="keywordflow">if</span> (pid.isSome()) {</div><div class="line"><a name="l00379"></a><span class="lineno">  379</span>&#160;          flow.<a class="code" href="classprocess_1_1Future.html#a71bde220aed3c725cef2040f63adf42a">onAny</a>(<a class="code" href="namespaceprocess.html#a8b27a2ef76eb133bf0ce7a5eea4fb77c">defer</a>(pid.get(), continuation));</div><div class="line"><a name="l00380"></a><span class="lineno">  380</span>&#160;        } <span class="keywordflow">else</span> {</div><div class="line"><a name="l00381"></a><span class="lineno">  381</span>&#160;          flow.<a class="code" href="classprocess_
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 ="l00387"></a><span class="lineno">  387</span>&#160;          }</div><div class="line"><a name="l00388"></a><span class="lineno">  388</span>&#160;        }</div><div class="line"><a name="l00389"></a><span class="lineno">  389</span>&#160;</div><div class="line"><a name="l00390"></a><span class="lineno">  390</span>&#160;        <span class="comment">// There&#39;s a race between when a discard occurs and the</span></div><div class="line"><a name="l00391"></a><span class="lineno">  391</span>&#160;        <span class="comment">// `discard` function gets invoked and therefore we must</span></div><div class="line"><a name="l00392"></a><span class="lineno">  392</span>&#160;        <span class="comment">// explicitly always do a discard. In addition, after a</span></div><div class="line"><a name="l00393"></a><span class="lineno">  393</span>&#160;        <span class="comment">// discard occurs we&#39;ll need to explicitly do discards for</span></div><div class="line"><a name="l00394"
 ></a><span class="lineno">  394</span>&#160;        <span class="comment">// each new future that blocks.</span></div><div class="line"><a name="l00395"></a><span class="lineno">  395</span>&#160;        <span class="keywordflow">if</span> (<a class="code" href="namespacemesos_1_1internal_1_1log_1_1protocol.html#a3b1f8bd7b18c51af9d1f58842950b545">promise</a>.future().hasDiscard()) {</div><div class="line"><a name="l00396"></a><span class="lineno">  396</span>&#160;          flow.<a class="code" href="classprocess_1_1Future.html#a4012f3faa6191fc13874dca62c14ced0">discard</a>();</div><div class="line"><a name="l00397"></a><span class="lineno">  397</span>&#160;        }</div><div class="line"><a name="l00398"></a><span class="lineno">  398</span>&#160;</div><div class="line"><a name="l00399"></a><span class="lineno">  399</span>&#160;        <span class="keywordflow">return</span>;</div><div class="line"><a name="l00400"></a><span class="lineno">  400</span>&#160;      }</div><div cla
 ss="line"><a name="l00401"></a><span class="lineno">  401</span>&#160;    }</div><div class="line"><a name="l00402"></a><span class="lineno">  402</span>&#160;</div><div class="line"><a name="l00403"></a><span class="lineno">  403</span>&#160;    <span class="keyword">auto</span> continuation = [<span class="keyword">self</span>](<span class="keyword">const</span> <a class="code" href="classprocess_1_1Future.html">Future&lt;T&gt;</a>&amp; next) {</div><div class="line"><a name="l00404"></a><span class="lineno">  404</span>&#160;      <span class="keywordflow">if</span> (next.<a class="code" href="classprocess_1_1Future.html#a68f241961e700d0cecf982d9cc0043d7">isReady</a>()) {</div><div class="line"><a name="l00405"></a><span class="lineno">  405</span>&#160;        <span class="keyword">self</span>-&gt;run(next);</div><div class="line"><a name="l00406"></a><span class="lineno">  406</span>&#160;      } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (next.<a
  class="code" href="classprocess_1_1Future.html#a493227e57f8848e37777b89c0f81e2ec">isFailed</a>()) {</div><div class="line"><a name="l00407"></a><span class="lineno">  407</span>&#160;        <span class="keyword">self</span>-&gt;promise.fail(next.<a class="code" href="classprocess_1_1Future.html#ae649c56b07f44c05e4b7aa3620133ff9">failure</a>());</div><div class="line"><a name="l00408"></a><span class="lineno">  408</span>&#160;      } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (next.<a class="code" href="classprocess_1_1Future.html#abc89036db733a417b7b383b091efaf3c">isDiscarded</a>()) {</div><div class="line"><a name="l00409"></a><span class="lineno">  409</span>&#160;        <span class="keyword">self</span>-&gt;promise.discard();</div><div class="line"><a name="l00410"></a><span class="lineno">  410</span>&#160;      }</div><div class="line"><a name="l00411"></a><span class="lineno">  411</span>&#160;    };</div><div class="line"><a name="l00412"></
 a><span class="lineno">  412</span>&#160;</div><div class="line"><a name="l00413"></a><span class="lineno">  413</span>&#160;    <span class="keywordflow">if</span> (pid.isSome()) {</div><div class="line"><a name="l00414"></a><span class="lineno">  414</span>&#160;      next.<a class="code" href="classprocess_1_1Future.html#a71bde220aed3c725cef2040f63adf42a">onAny</a>(<a class="code" href="namespaceprocess.html#a8b27a2ef76eb133bf0ce7a5eea4fb77c">defer</a>(pid.get(), continuation));</div><div class="line"><a name="l00415"></a><span class="lineno">  415</span>&#160;    } <span class="keywordflow">else</span> {</div><div class="line"><a name="l00416"></a><span class="lineno">  416</span>&#160;      next.<a class="code" href="classprocess_1_1Future.html#a71bde220aed3c725cef2040f63adf42a">onAny</a>(continuation);</div><div class="line"><a name="l00417"></a><span class="lineno">  417</span>&#160;    }</div><div class="line"><a name="l00418"></a><span class="lineno">  418</span>&#160;</div
 ><div class="line"><a name="l00419"></a><span class="lineno">  419</span>&#160;    <span class="keywordflow">if</span> (!<a class="code" href="namespacemesos_1_1internal_1_1log_1_1protocol.html#a3b1f8bd7b18c51af9d1f58842950b545">promise</a>.future().hasDiscard()) {</div><div class="line"><a name="l00420"></a><span class="lineno">  420</span>&#160;      <span class="keyword">synchronized</span> (mutex) {</div><div class="line"><a name="l00421"></a><span class="lineno">  421</span>&#160;        <a class="code" href="namespaceprocess.html#adc504b79a0e7ec7c4caa088a937d4feb">discard</a> = [=]() <span class="keyword">mutable</span> { next.<a class="code" href="classprocess_1_1Future.html#a4012f3faa6191fc13874dca62c14ced0">discard</a>(); };</div><div class="line"><a name="l00422"></a><span class="lineno">  422</span>&#160;      }</div><div class="line"><a name="l00423"></a><span class="lineno">  423</span>&#160;    }</div><div class="line"><a name="l00424"></a><span class="lineno">  424</s
 pan>&#160;</div><div class="line"><a name="l00425"></a><span class="lineno">  425</span>&#160;    <span class="comment">// See comment above as to why we need to explicitly discard</span></div><div class="line"><a name="l00426"></a><span class="lineno">  426</span>&#160;    <span class="comment">// regardless of the path the if statement took above.</span></div><div class="line"><a name="l00427"></a><span class="lineno">  427</span>&#160;    <span class="keywordflow">if</span> (<a class="code" href="namespacemesos_1_1internal_1_1log_1_1protocol.html#a3b1f8bd7b18c51af9d1f58842950b545">promise</a>.future().hasDiscard()) {</div><div class="line"><a name="l00428"></a><span class="lineno">  428</span>&#160;      next.<a class="code" href="classprocess_1_1Future.html#a4012f3faa6191fc13874dca62c14ced0">discard</a>();</div><div class="line"><a name="l00429"></a><span class="lineno">  429</span>&#160;    }</div><div class="line"><a name="l00430"></a><span class="lineno">  430</span>&#160;  }
 </div><div class="line"><a name="l00431"></a><span class="lineno">  431</span>&#160;</div><div class="line"><a name="l00432"></a><span class="lineno">  432</span>&#160;<span class="keyword">protected</span>:</div><div class="line"><a name="l00433"></a><span class="lineno"><a class="line" href="classprocess_1_1internal_1_1Loop.html#a077dc66e82c758d8b82dda11fc530d72">  433</a></span>&#160;  <a class="code" href="classprocess_1_1internal_1_1Loop.html#a077dc66e82c758d8b82dda11fc530d72">Loop</a>(<span class="keyword">const</span> <a class="code" href="classOption.html">Option&lt;UPID&gt;</a>&amp; pid, <span class="keyword">const</span> Iterate&amp; iterate, <span class="keyword">const</span> Body&amp; body)</div><div class="line"><a name="l00434"></a><span class="lineno">  434</span>&#160;    : pid(pid), iterate(iterate), body(body) {}</div><div class="line"><a name="l00435"></a><span class="lineno">  435</span>&#160;</div><div class="line"><a name="l00436"></a><span class="lineno"><a cl
 ass="line" href="classprocess_1_1internal_1_1Loop.html#a0c7b83e40e88e5d40ad29802be101dfd">  436</a></span>&#160;  <a class="code" href="classprocess_1_1internal_1_1Loop.html#a0c7b83e40e88e5d40ad29802be101dfd">Loop</a>(<span class="keyword">const</span> <a class="code" href="classOption.html">Option&lt;UPID&gt;</a>&amp; pid, Iterate&amp;&amp; iterate, Body&amp;&amp; body)</div><div class="line"><a name="l00437"></a><span class="lineno">  437</span>&#160;    : pid(pid), iterate(<a class="code" href="namespacestd.html">std</a>::move(iterate)), body(<a class="code" href="namespacestd.html">std</a>::move(body)) {}</div><div class="line"><a name="l00438"></a><span class="lineno">  438</span>&#160;</div><div class="line"><a name="l00439"></a><span class="lineno">  439</span>&#160;<span class="keyword">private</span>:</div><div class="line"><a name="l00440"></a><span class="lineno">  440</span>&#160;  <span class="keyword">const</span> <a class="code" href="classOption.html">Option&lt;UPID&
 gt;</a> pid;</div><div class="line"><a name="l00441"></a><span class="lineno">  441</span>&#160;  Iterate iterate;</div><div class="line"><a name="l00442"></a><span class="lineno">  442</span>&#160;  Body body;</div><div class="line"><a name="l00443"></a><span class="lineno">  443</span>&#160;  <a class="code" href="classprocess_1_1Promise.html">Promise&lt;R&gt;</a> <a class="code" href="namespacemesos_1_1internal_1_1log_1_1protocol.html#a3b1f8bd7b18c51af9d1f58842950b545">promise</a>;</div><div class="line"><a name="l00444"></a><span class="lineno">  444</span>&#160;</div><div class="line"><a name="l00445"></a><span class="lineno">  445</span>&#160;  <span class="comment">// In order to discard the loop safely we capture the future that</span></div><div class="line"><a name="l00446"></a><span class="lineno">  446</span>&#160;  <span class="comment">// needs to be discarded within the `discard` function and reading</span></div><div class="line"><a name="l00447"></a><span class="linen
 o">  447</span>&#160;  <span class="comment">// and writing that function with a mutex.</span></div><div class="line"><a name="l00448"></a><span class="lineno">  448</span>&#160;  std::mutex mutex;</div><div class="line"><a name="l00449"></a><span class="lineno">  449</span>&#160;  std::function&lt;void()&gt; <a class="code" href="namespaceprocess.html#adc504b79a0e7ec7c4caa088a937d4feb">discard</a> = []() {};</div><div class="line"><a name="l00450"></a><span class="lineno">  450</span>&#160;};</div><div class="line"><a name="l00451"></a><span class="lineno">  451</span>&#160;</div><div class="line"><a name="l00452"></a><span class="lineno">  452</span>&#160;} <span class="comment">// namespace internal {</span></div><div class="line"><a name="l00453"></a><span class="lineno">  453</span>&#160;</div><div class="line"><a name="l00454"></a><span class="lineno">  454</span>&#160;</div><div class="line"><a name="l00455"></a><span class="lineno">  455</span>&#160;<span class="keyword">tem
 plate</span> &lt;<span class="keyword">typename</span> Iterate, <span class="keyword">typename</span> Body, <span class="keyword">typename</span> T, <span class="keyword">typename</span> CF, <span class="keyword">typename</span> V&gt;</div><div class="line"><a name="l00456"></a><span class="lineno"><a class="line" href="namespaceprocess.html#a852052836f10e7c11a19320e846d472e">  456</a></span>&#160;<a class="code" href="classprocess_1_1Future.html">Future&lt;V&gt;</a> <a class="code" href="namespaceprocess.html#a59c192ee8ea5abbbee1642957f47c92a">loop</a>(<span class="keyword">const</span> <a class="code" href="classOption.html">Option&lt;UPID&gt;</a>&amp; pid, Iterate&amp;&amp; iterate, Body&amp;&amp; body)</div><div class="line"><a name="l00457"></a><span class="lineno">  457</span>&#160;{</div><div class="line"><a name="l00458"></a><span class="lineno">  458</span>&#160;  <span class="keyword">using</span> Loop = <a class="code" href="classprocess_1_1internal_1_1Loop.html">internal
 ::Loop</a>&lt;</div><div class="line"><a name="l00459"></a><span class="lineno">  459</span>&#160;    <span class="keyword">typename</span> <a class="code" href="namespacemesos_1_1internal_1_1fs.html#a2343e2642db514496ba8380776487fba">std::decay&lt;Iterate&gt;::type</a>,</div><div class="line"><a name="l00460"></a><span class="lineno">  460</span>&#160;    <span class="keyword">typename</span> <a class="code" href="namespacemesos_1_1internal_1_1fs.html#a2343e2642db514496ba8380776487fba">std::decay&lt;Body&gt;::type</a>,</div><div class="line"><a name="l00461"></a><span class="lineno">  461</span>&#160;    T,</div><div class="line"><a name="l00462"></a><span class="lineno">  462</span>&#160;    V&gt;;</div><div class="line"><a name="l00463"></a><span class="lineno">  463</span>&#160;</div><div class="line"><a name="l00464"></a><span class="lineno">  464</span>&#160;  std::shared_ptr&lt;Loop&gt; <a class="code" href="namespaceprocess.html#a59c192ee8ea5abbbee1642957f47c92a">loop</a> = 
 <a class="code" href="namespacecgroups.html#a2ecc89636706df947027a4c3c2100fbe">Loop::create</a>(</div><div class="line"><a name="l00465"></a><span class="lineno">  465</span>&#160;      pid,</div><div class="line"><a name="l00466"></a><span class="lineno">  466</span>&#160;      std::forward&lt;Iterate&gt;(iterate),</div><div class="line"><a name="l00467"></a><span class="lineno">  467</span>&#160;      std::forward&lt;Body&gt;(body));</div><div class="line"><a name="l00468"></a><span class="lineno">  468</span>&#160;</div><div class="line"><a name="l00469"></a><span class="lineno">  469</span>&#160;  <span class="keywordflow">return</span> loop-&gt;start();</div><div class="line"><a name="l00470"></a><span class="lineno">  470</span>&#160;}</div><div class="line"><a name="l00471"></a><span class="lineno">  471</span>&#160;</div><div class="line"><a name="l00472"></a><span class="lineno">  472</span>&#160;} <span class="comment">// namespace process {</span></div><div class="line"><
 a name="l00473"></a><span class="lineno">  473</span>&#160;</div><div class="line"><a name="l00474"></a><span class="lineno">  474</span>&#160;<span class="preprocessor">#endif // __PROCESS_LOOP_HPP__</span></div><div class="ttc" id="classprocess_1_1ControlFlow_html_ad8f5968ae93a1c00cfd67964c7895260"><div class="ttname"><a href="classprocess_1_1ControlFlow.html#ad8f5968ae93a1c00cfd67964c7895260">process::ControlFlow::ControlFlow</a></div><div class="ttdeci">ControlFlow(Statement s, Option&lt; T &gt; t)</div><div class="ttdef"><b>Definition:</b> loop.hpp:207</div></div>
-<div class="ttc" id="classprocess_1_1Future_html_a68f241961e700d0cecf982d9cc0043d7"><div class="ttname"><a href="classprocess_1_1Future.html#a68f241961e700d0cecf982d9cc0043d7">process::Future::isReady</a></div><div class="ttdeci">bool isReady() const </div><div class="ttdef"><b>Definition:</b> future.hpp:1220</div></div>
+<div class="ttc" id="classprocess_1_1Future_html_a68f241961e700d0cecf982d9cc0043d7"><div class="ttname"><a href="classprocess_1_1Future.html#a68f241961e700d0cecf982d9cc0043d7">process::Future::isReady</a></div><div class="ttdeci">bool isReady() const </div><div class="ttdef"><b>Definition:</b> future.hpp:1227</div></div>
 <div class="ttc" id="classprocess_1_1internal_1_1Loop_html"><div class="ttname"><a href="classprocess_1_1internal_1_1Loop.html">process::internal::Loop</a></div><div class="ttdef"><b>Definition:</b> loop.hpp:253</div></div>
 <div class="ttc" id="structNothing_html"><div class="ttname"><a href="structNothing.html">Nothing</a></div><div class="ttdef"><b>Definition:</b> nothing.hpp:16</div></div>
 <div class="ttc" id="classprocess_1_1ControlFlow_html_af212ef291f73ba2e7b37586a577a794ba14d6a3e0201f58bfe7c01e775973e80e"><div class="ttname"><a href="classprocess_1_1ControlFlow.html#af212ef291f73ba2e7b37586a577a794ba14d6a3e0201f58bfe7c01e775973e80e">process::ControlFlow::Statement::BREAK</a></div></div>
 <div class="ttc" id="classOption_html"><div class="ttname"><a href="classOption.html">Option</a></div><div class="ttdef"><b>Definition:</b> option.hpp:28</div></div>
 <div class="ttc" id="namespaceprocess_html_a62d5333e8ec1817c249cf83e15d568b4"><div class="ttname"><a href="namespaceprocess.html#a62d5333e8ec1817c249cf83e15d568b4">process::f</a></div><div class="ttdeci">F &amp;&amp; f</div><div class="ttdef"><b>Definition:</b> defer.hpp:270</div></div>
 <div class="ttc" id="classprocess_1_1internal_1_1Loop_html_a4067cc276cd8152074a7094acf9ca451"><div class="ttname"><a href="classprocess_1_1internal_1_1Loop.html#a4067cc276cd8152074a7094acf9ca451">process::internal::Loop::create</a></div><div class="ttdeci">static std::shared_ptr&lt; Loop &gt; create(const Option&lt; UPID &gt; &amp;pid, Iterate_ &amp;&amp;iterate, Body_ &amp;&amp;body)</div><div class="ttdef"><b>Definition:</b> loop.hpp:257</div></div>
-<div class="ttc" id="classprocess_1_1Future_html_aa78977d3b585a5f5ccd682c1e9e2ddc4"><div class="ttname"><a href="classprocess_1_1Future.html#aa78977d3b585a5f5ccd682c1e9e2ddc4">process::Future::get</a></div><div class="ttdeci">const T &amp; get() const </div><div class="ttdef"><b>Definition:</b> future.hpp:1299</div></div>
-<div class="ttc" id="structprocess_1_1internal_1_1unwrap_html_a42055ebfe5f79c5139c8811f9866cce9"><div class="ttname"><a href="structprocess_1_1internal_1_1unwrap.html#a42055ebfe5f79c5139c8811f9866cce9">process::internal::unwrap::type</a></div><div class="ttdeci">T type</div><div class="ttdef"><b>Definition:</b> future.hpp:939</div></div>
+<div class="ttc" id="classprocess_1_1Future_html_aa78977d3b585a5f5ccd682c1e9e2ddc4"><div class="ttname"><a href="classprocess_1_1Future.html#aa78977d3b585a5f5ccd682c1e9e2ddc4">process::Future::get</a></div><div class="ttdeci">const T &amp; get() const </div><div class="ttdef"><b>Definition:</b> future.hpp:1306</div></div>
+<div class="ttc" id="structprocess_1_1internal_1_1unwrap_html_a42055ebfe5f79c5139c8811f9866cce9"><div class="ttname"><a href="structprocess_1_1internal_1_1unwrap.html#a42055ebfe5f79c5139c8811f9866cce9">process::internal::unwrap::type</a></div><div class="ttdeci">T type</div><div class="ttdef"><b>Definition:</b> future.hpp:942</div></div>
 <div class="ttc" id="namespaceprocess_html_a4beae62da50c26c6cb8afd14e385d0c8"><div class="ttname"><a href="namespaceprocess.html#a4beae62da50c26c6cb8afd14e385d0c8">process::Break</a></div><div class="ttdeci">ControlFlow&lt; typename std::decay&lt; T &gt;::type &gt;::Break Break(T &amp;&amp;t)</div><div class="ttdef"><b>Definition:</b> loop.hpp:237</div></div>
 <div class="ttc" id="classprocess_1_1ControlFlow_html_a34752a25284d038dc5d4d9e551424cfe"><div class="ttname"><a href="classprocess_1_1ControlFlow.html#a34752a25284d038dc5d4d9e551424cfe">process::ControlFlow::statement</a></div><div class="ttdeci">Statement statement() const </div><div class="ttdef"><b>Definition:</b> loop.hpp:209</div></div>
 <div class="ttc" id="classprocess_1_1internal_1_1Loop_html_a39870dcf4e2432a29569a658ec0e33be"><div class="ttname"><a href="classprocess_1_1internal_1_1Loop.html#a39870dcf4e2432a29569a658ec0e33be">process::internal::Loop::weak</a></div><div class="ttdeci">std::weak_ptr&lt; Loop &gt; weak()</div><div class="ttdef"><b>Definition:</b> loop.hpp:275</div></div>
 <div class="ttc" id="namespacestd_html"><div class="ttname"><a href="namespacestd.html">std</a></div><div class="ttdef"><b>Definition:</b> type_utils.hpp:510</div></div>
 <div class="ttc" id="classprocess_1_1ControlFlow_html_af212ef291f73ba2e7b37586a577a794b"><div class="ttname"><a href="classprocess_1_1ControlFlow.html#af212ef291f73ba2e7b37586a577a794b">process::ControlFlow::Statement</a></div><div class="ttdeci">Statement</div><div class="ttdef"><b>Definition:</b> loop.hpp:168</div></div>
 <div class="ttc" id="classprocess_1_1ProcessBase_html"><div class="ttname"><a href="classprocess_1_1ProcessBase.html">process::ProcessBase</a></div><div class="ttdef"><b>Definition:</b> process.hpp:72</div></div>
-<div class="ttc" id="classprocess_1_1Future_html_a4012f3faa6191fc13874dca62c14ced0"><div class="ttname"><a href="classprocess_1_1Future.html#a4012f3faa6191fc13874dca62c14ced0">process::Future::discard</a></div><div class="ttdeci">bool discard()</div><div class="ttdef"><b>Definition:</b> future.hpp:1162</div></div>
+<div class="ttc" id="classprocess_1_1Future_html_a4012f3faa6191fc13874dca62c14ced0"><div class="ttname"><a href="classprocess_1_1Future.html#a4012f3faa6191fc13874dca62c14ced0">process::Future::discard</a></div><div class="ttdeci">bool discard()</div><div class="ttdef"><b>Definition:</b> future.hpp:1169</div></div>
 <div class="ttc" id="classprocess_1_1ControlFlow_html_a5ce1f085b8043fe8ac900ce9f63a0bde"><div class="ttname"><a href="classprocess_1_1ControlFlow.html#a5ce1f085b8043fe8ac900ce9f63a0bde">process::ControlFlow::ValueType</a></div><div class="ttdeci">T ValueType</div><div class="ttdef"><b>Definition:</b> loop.hpp:166</div></div>
 <div class="ttc" id="dispatch_8hpp_html"><div class="ttname"><a href="dispatch_8hpp.html">dispatch.hpp</a></div></div>
 <div class="ttc" id="namespaceprocess_html_aff22904a83567125d3b4d0d88e5a2270"><div class="ttname"><a href="namespaceprocess.html#aff22904a83567125d3b4d0d88e5a2270">process::spawn</a></div><div class="ttdeci">UPID spawn(ProcessBase *process, bool manage=false)</div><div class="ttdoc">Spawn a new process. </div></div>
 <div class="ttc" id="namespaceprocess_html_a20443908afa3212215166e26065349e5"><div class="ttname"><a href="namespaceprocess.html#a20443908afa3212215166e26065349e5">process::terminate</a></div><div class="ttdeci">void terminate(const UPID &amp;pid, bool inject=true)</div><div class="ttdoc">Sends a TerminateEvent to the given process. </div></div>
 <div class="ttc" id="namespaceprocess_html_a7a61f12f614ea8c61821e61682c4bfb9"><div class="ttname"><a href="namespaceprocess.html#a7a61f12f614ea8c61821e61682c4bfb9">process::Break</a></div><div class="ttdeci">ControlFlow&lt; Nothing &gt;::Break Break()</div><div class="ttdef"><b>Definition:</b> loop.hpp:244</div></div>
 <div class="ttc" id="namespaceprocess_html_acfbc29404bc653268289691b0dd59e22"><div class="ttname"><a href="namespaceprocess.html#acfbc29404bc653268289691b0dd59e22">process::dispatch</a></div><div class="ttdeci">void dispatch(const PID&lt; T &gt; &amp;pid, void(T::*method)())</div><div class="ttdef"><b>Definition:</b> dispatch.hpp:174</div></div>
-<div class="ttc" id="classprocess_1_1Future_html_abc89036db733a417b7b383b091efaf3c"><div class="ttname"><a href="classprocess_1_1Future.html#abc89036db733a417b7b383b091efaf3c">process::Future::isDiscarded</a></div><div class="ttdeci">bool isDiscarded() const </div><div class="ttdef"><b>Definition:</b> future.hpp:1227</div></div>
+<div class="ttc" id="classprocess_1_1Future_html_abc89036db733a417b7b383b091efaf3c"><div class="ttname"><a href="classprocess_1_1Future.html#abc89036db733a417b7b383b091efaf3c">process::Future::isDiscarded</a></div><div class="ttdeci">bool isDiscarded() const </div><div class="ttdef"><b>Definition:</b> future.hpp:1234</div></div>
 <div class="ttc" id="structprocess_1_1UPID_html"><div class="ttname"><a href="structprocess_1_1UPID.html">process::UPID</a></div><div class="ttdoc">An &quot;untyped&quot; PID, used to encapsulate the process ID for lower-layer abstractions (eg...</div><div class="ttdef"><b>Definition:</b> pid.hpp:39</div></div>
-<div class="ttc" id="classprocess_1_1Future_html_a71bde220aed3c725cef2040f63adf42a"><div class="ttname"><a href="classprocess_1_1Future.html#a71bde220aed3c725cef2040f63adf42a">process::Future::onAny</a></div><div class="ttdeci">const Future&lt; T &gt; &amp; onAny(AnyCallback &amp;&amp;callback) const </div><div class="ttdef"><b>Definition:</b> future.hpp:1447</div></div>
+<div class="ttc" id="classprocess_1_1Future_html_a71bde220aed3c725cef2040f63adf42a"><div class="ttname"><a href="classprocess_1_1Future.html#a71bde220aed3c725cef2040f63adf42a">process::Future::onAny</a></div><div class="ttdeci">const Future&lt; T &gt; &amp; onAny(AnyCallback &amp;&amp;callback) const </div><div class="ttdef"><b>Definition:</b> future.hpp:1454</div></div>
 <div class="ttc" id="classprocess_1_1ControlFlow_html_ad0fbad53169fc7766d61a69393ac14bc"><div class="ttname"><a href="classprocess_1_1Contro

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