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[35/46] mesos-site git commit: Updated the website built from mesos
SHA: a52e528.
http://git-wip-us.apache.org/repos/asf/mesos-site/blob/e42c5d57/content/api/latest/c++/collect_8hpp_source.html
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<div class="title">collect.hpp</div> </div>
</div><!--header-->
<div class="contents">
-<a href="collect_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> <span class="comment">// Licensed under the Apache License, Version 2.0 (the "License");</span></div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <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> <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> <span class="comment">//</span></div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <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> <span class="comment">//</s
pan></div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <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> <span class="comment">// distributed under the License is distributed on an "AS IS" BASIS,</span></div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <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> <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> <span class="comment">// limitations under the License</span></div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> </div><div class="l
ine"><a name="l00013"></a><span class="lineno"> 13</span> <span class="preprocessor">#ifndef __PROCESS_COLLECT_HPP__</span></div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="preprocessor">#define __PROCESS_COLLECT_HPP__</span></div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> </div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="preprocessor">#include <functional></span></div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="preprocessor">#include <list></span></div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="preprocessor">#include <tuple></span></div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span> </div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="preprocessor">#include <<a
class="code" href="libprocess_2include_2process_2check_8hpp.html">process/check.hpp</a>></span></div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="preprocessor">#include <<a class="code" href="defer_8hpp.html">process/defer.hpp</a>></span></div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="preprocessor">#include <<a class="code" href="future_8hpp.html">process/future.hpp</a>></span></div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="preprocessor">#include <<a class="code" href="id_8hpp.html">process/id.hpp</a>></span></div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="preprocessor">#include <<a class="code" href="owned_8hpp.html">process/owned.hpp</a>></span></div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="preprocessor">#include &l
t;<a class="code" href="libprocess_2include_2process_2process_8hpp.html">process/process.hpp</a>></span></div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span> </div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="preprocessor">#include <<a class="code" href="lambda_8hpp.html">stout/lambda.hpp</a>></span></div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span> </div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="comment">// TODO(bmahler): Move these into a futures.hpp header to group Future</span></div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="comment">// related utilities.</span></div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span> </div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="keyword">namespace </span><a
class="code" href="namespaceprocess.html">process</a> {</div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span> </div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="comment">// Waits on each future in the specified list and returns the list of</span></div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="comment">// resulting values in the same order. If any future is discarded then</span></div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="comment">// the result will be a failure. Likewise, if any future fails then</span></div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="comment">// the result future will be a failure.</span></div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="keyword">template</span> <<span class="keyword">typename</spa
n> T></div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span> Future<std::list<T>> <a class="code" href="namespaceprocess.html#a0f89a937c1caa20e3048e16aeb0c9736">collect</a>(<span class="keyword">const</span> <a class="code" href="namespacecgroups_1_1devices.html#a22494291bc2cb89697dcd2b5f288bdd3">std::list</a><Future<T>>& futures);</div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span> </div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span> </div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="comment">// Waits on each future specified and returns the wrapping future</span></div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="comment">// typed of a tuple of values.</span></div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="keyword">template</
span> <<span class="keyword">typename</span>... Ts></div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span> Future<std::tuple<Ts...>> <a class="code" href="namespaceprocess.html#a0f89a937c1caa20e3048e16aeb0c9736">collect</a>(<span class="keyword">const</span> Future<Ts>&... futures);</div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span> </div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span> </div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <span class="comment">// Waits on each future in the specified set and returns the list of</span></div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="comment">// non-pending futures.</span></div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span> <span class="keyword">template</span> <<span class="keyword">typename</span> T></di
v><div class="line"><a name="l00051"></a><span class="lineno"> 51</span> Future<std::list<Future<T>>> <a class="code" href="namespaceprocess.html#a9244f063b856adbc7182f8620b01034c">await</a>(<span class="keyword">const</span> <a class="code" href="namespacecgroups_1_1devices.html#a22494291bc2cb89697dcd2b5f288bdd3">std::list</a><Future<T>>& futures);</div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span> </div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span> </div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span> <span class="comment">// Waits on each future specified and returns the wrapping future</span></div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span> <span class="comment">// typed of a tuple of futures.</span></div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span> <span class="keyword">template<
/span> <<span class="keyword">typename</span>... Ts></div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span> Future<std::tuple<Future<Ts>...>> <a class="code" href="namespaceprocess.html#a9244f063b856adbc7182f8620b01034c">await</a>(<span class="keyword">const</span> Future<Ts>&... futures);</div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span> </div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span> </div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span> <span class="comment">// Waits on the future specified and returns after the future has been</span></div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <span class="comment">// completed or the await has been discarded. This is useful when</span></div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span> <span class="comment">// wanting
to "break out" of a future chain if a discard occurs but</span></div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span> <span class="comment">// the underlying future has not been discarded. For example:</span></div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span> <span class="comment">//</span></div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span> <span class="comment">// Future<string> foo()</span></div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span> <span class="comment">// {</span></div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span> <span class="comment">// return bar()</span></div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span> <span class="comment">// .then([](int i) {</span></div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span> <span class="com
ment">// return stringify(i);</span></div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span> <span class="comment">// });</span></div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span> <span class="comment">// }</span></div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span> <span class="comment">//</span></div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span> <span class="comment">// Future<stringify> future = foo();</span></div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span> <span class="comment">// future.discard();</span></div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span> <span class="comment">//</span></div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span> <span class="comment">// In the above code we'll propagate the discard to `bar()` but might</span><
/div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span> <span class="comment">// wait forever if `bar()` can't discard their computation. In some</span></div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span> <span class="comment">// circumstances you might want to break out early and you can do that</span></div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span> <span class="comment">// by using `await`, because if we discard an `await` that function</span></div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span> <span class="comment">// will return even though all of the future's it is waiting on have</span></div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span> <span class="comment">// not been discarded (in other words, the `await` can be properly</span></div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span> <sp
an class="comment">// discarded even if the underlying futures have not been discarded).</span></div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span> <span class="comment">//</span></div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span> <span class="comment">// Future<string> foo()</span></div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span> <span class="comment">// {</span></div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span> <span class="comment">// return await(bar())</span></div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span> <span class="comment">// .recover([](const Future<Future<string>>& future) {</span></div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span> <span class="comment">// if (future.isDiscarded()) {</span></div><div class="line"><a name="l00089"></a>
<span class="lineno"> 89</span> <span class="comment">// cleanup();</span></div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span> <span class="comment">// }</span></div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span> <span class="comment">// return Failure("Discarded waiting");</span></div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span> <span class="comment">// })</span></div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span> <span class="comment">// .then([](const Future<int>& future) {</span></div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span> <span class="comment">// return future</span></div><div class="line"><a name="l00095"></a><span class="lineno"> 95</span> <span class="comment">// .then([](int i) {</span></div><div class="line"><a name="l0009
6"></a><span class="lineno"> 96</span> <span class="comment">// return stringify(i);</span></div><div class="line"><a name="l00097"></a><span class="lineno"> 97</span> <span class="comment">// });</span></div><div class="line"><a name="l00098"></a><span class="lineno"> 98</span> <span class="comment">// });</span></div><div class="line"><a name="l00099"></a><span class="lineno"> 99</span> <span class="comment">// }</span></div><div class="line"><a name="l00100"></a><span class="lineno"> 100</span> <span class="comment">//</span></div><div class="line"><a name="l00101"></a><span class="lineno"> 101</span> <span class="comment">// Future<string> future = foo();</span></div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span> <span class="comment">// future.discard();</span></div><div class="line"><a name="l00103"></a><span class="lineno"> 103</span> <span class="comment">//</
span></div><div class="line"><a name="l00104"></a><span class="lineno"> 104</span> <span class="comment">// Using `await` will enable you to continue execution even if `bar()`</span></div><div class="line"><a name="l00105"></a><span class="lineno"> 105</span> <span class="comment">// does not (or can not) discard their execution.</span></div><div class="line"><a name="l00106"></a><span class="lineno"> 106</span> <span class="keyword">template</span> <<span class="keyword">typename</span> T></div><div class="line"><a name="l00107"></a><span class="lineno"><a class="line" href="namespaceprocess.html#a9d64abf575bde6dc82f9d915b33743c8"> 107</a></span> <a class="code" href="classprocess_1_1Future.html">Future<Future<T></a>> <a class="code" href="namespaceprocess.html#a9244f063b856adbc7182f8620b01034c">await</a>(<span class="keyword">const</span> <a class="code" href="classprocess_1_1Future.html">Future<T></a>& future)</div><div class="l
ine"><a name="l00108"></a><span class="lineno"> 108</span> {</div><div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  <span class="keywordflow">return</span> <a class="code" href="namespaceprocess.html#a9244f063b856adbc7182f8620b01034c">await</a>(<a class="code" href="namespacecgroups_1_1devices.html#a22494291bc2cb89697dcd2b5f288bdd3">std::list</a><<a class="code" href="classprocess_1_1Future.html">Future<T></a>>{future})</div><div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  .<a class="code" href="namespaceprocess_1_1internal.html#a7885011cf6470b707294a6ef4ec7a0a6">then</a>([=]() {</div><div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  <span class="keywordflow">return</span> <a class="code" href="classprocess_1_1Future.html">Future<Future<T></a>>(future);</div><div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  });</div><div class
="line"><a name="l00113"></a><span class="lineno"> 113</span> }</div><div class="line"><a name="l00114"></a><span class="lineno"> 114</span> </div><div class="line"><a name="l00115"></a><span class="lineno"> 115</span> </div><div class="line"><a name="l00116"></a><span class="lineno"><a class="line" href="namespaceprocess_1_1internal.html"> 116</a></span> <span class="keyword">namespace </span><a class="code" href="namespaceinternal.html">internal</a> {</div><div class="line"><a name="l00117"></a><span class="lineno"> 117</span> </div><div class="line"><a name="l00118"></a><span class="lineno"> 118</span> <span class="keyword">template</span> <<span class="keyword">typename</span> T></div><div class="line"><a name="l00119"></a><span class="lineno"><a class="line" href="classprocess_1_1internal_1_1CollectProcess.html"> 119</a></span> <span class="keyword">class </span><a class="code" href="classprocess_1_1internal_1_1CollectProcess.html
">CollectProcess</a> : <span class="keyword">public</span> <a class="code" href="classprocess_1_1Process.html">Process</a><CollectProcess<T>></div><div class="line"><a name="l00120"></a><span class="lineno"> 120</span> {</div><div class="line"><a name="l00121"></a><span class="lineno"> 121</span> <span class="keyword">public</span>:</div><div class="line"><a name="l00122"></a><span class="lineno"><a class="line" href="classprocess_1_1internal_1_1CollectProcess.html#aeae1fffc984af46ddb3b0570408c5ee0"> 122</a></span>  <a class="code" href="classprocess_1_1internal_1_1CollectProcess.html#aeae1fffc984af46ddb3b0570408c5ee0">CollectProcess</a>(</div><div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  <span class="keyword">const</span> <a class="code" href="namespacecgroups_1_1devices.html#a22494291bc2cb89697dcd2b5f288bdd3">std::list</a><<a class="code" href="classprocess_1_1Future.html">Future<T></a>>& _futures
,</div><div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  <a class="code" href="classprocess_1_1Promise.html">Promise</a><std::list<T>>* _promise)</div><div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  : <a class="code" href="classprocess_1_1ProcessBase.html">ProcessBase</a>(ID::<a class="code" href="namespaceprocess_1_1ID.html#aeb11a48c9def1da169d8455a30d0ee39">generate</a>(<span class="stringliteral">"__collect__"</span>)),</div><div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  futures(_futures.begin(), _futures.end()),</div><div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  promise(_promise),</div><div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  ready(0) {}</div><div class="line"><a name="l00129"></a><span class="lineno"> 129</span> </div><div class="line"><a name="l00130"></a><span class
="lineno"><a class="line" href="classprocess_1_1internal_1_1CollectProcess.html#aef71c5f6f3c016b544805111417573a8"> 130</a></span>  <span class="keyword">virtual</span> <a class="code" href="classprocess_1_1internal_1_1CollectProcess.html#aef71c5f6f3c016b544805111417573a8">~CollectProcess</a>()</div><div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  {</div><div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  <span class="keyword">delete</span> promise;</div><div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  }</div><div class="line"><a name="l00134"></a><span class="lineno"> 134</span> </div><div class="line"><a name="l00135"></a><span class="lineno"> 135</span> <span class="keyword">protected</span>:</div><div class="line"><a name="l00136"></a><span class="lineno"><a class="line" href="classprocess_1_1internal_1_1CollectProcess.html#a6e13d430bd37e93903d3f0b4201b8e31"> 136</a></
span>  <span class="keyword">virtual</span> <span class="keywordtype">void</span> <a class="code" href="classprocess_1_1internal_1_1CollectProcess.html#a6e13d430bd37e93903d3f0b4201b8e31">initialize</a>()</div><div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  {</div><div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  <span class="comment">// Stop this nonsense if nobody cares.</span></div><div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  promise-><a class="code" href="classprocess_1_1Promise.html#a8aef752d6c90cb11e58e3166b7592ef1">future</a>().<a class="code" href="classprocess_1_1Future.html#a1b80bf321358be44880d9c6bae5d9a2d">onDiscard</a>(<a class="code" href="namespaceprocess.html#a8b27a2ef76eb133bf0ce7a5eea4fb77c">defer</a>(<span class="keyword">this</span>, &CollectProcess::discarded));</div><div class="line"><a name="l00140"></a><span class="lineno"> 140</span> </div><
div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  <span class="keywordflow">foreach</span> (<span class="keyword">const</span> <a class="code" href="classprocess_1_1Future.html">Future<T></a>& future, futures) {</div><div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  future.<a class="code" href="classprocess_1_1Future.html#a71bde220aed3c725cef2040f63adf42a">onAny</a>(<a class="code" href="namespaceprocess.html#a8b27a2ef76eb133bf0ce7a5eea4fb77c">defer</a>(<span class="keyword">this</span>, &CollectProcess::waited, lambda::_1));</div><div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  future.<a class="code" href="classprocess_1_1Future.html#a3ef51b1f7e70860758e47c39ed7660f1">onAbandoned</a>(<a class="code" href="namespaceprocess.html#a8b27a2ef76eb133bf0ce7a5eea4fb77c">defer</a>(<span class="keyword">this</span>, &CollectProcess::abandoned));</div><div class="line"><a name=
"l00144"></a><span class="lineno"> 144</span>  }</div><div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  }</div><div class="line"><a name="l00146"></a><span class="lineno"> 146</span> </div><div class="line"><a name="l00147"></a><span class="lineno"> 147</span> <span class="keyword">private</span>:</div><div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  <span class="keywordtype">void</span> abandoned()</div><div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  {</div><div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  <span class="comment">// There is no use waiting because this future will never complete</span></div><div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  <span class="comment">// so terminate this process which will cause `promise` to get</span></div><div class="line"><a name="l00152"></a><span class="lineno
"> 152</span>  <span class="comment">// deleted and our future to also be abandoned.</span></div><div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  <a class="code" href="namespaceprocess.html#a20443908afa3212215166e26065349e5">terminate</a>(<span class="keyword">this</span>);</div><div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  }</div><div class="line"><a name="l00155"></a><span class="lineno"> 155</span> </div><div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  <span class="keywordtype">void</span> discarded()</div><div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  {</div><div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  <span class="keywordflow">foreach</span> (<a class="code" href="classprocess_1_1Future.html">Future<T></a> future, futures) {</div><div class="line"><a name="l00159"></a><span class="lineno"> 1
59</span>  future.<a class="code" href="classprocess_1_1Future.html#a4012f3faa6191fc13874dca62c14ced0">discard</a>();</div><div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  }</div><div class="line"><a name="l00161"></a><span class="lineno"> 161</span> </div><div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  <span class="comment">// NOTE: we discard the promise after we set discard on each of</span></div><div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  <span class="comment">// the futures so that there is a happens-before relationship that</span></div><div class="line"><a name="l00164"></a><span class="lineno"> 164</span>  <span class="comment">// can be assumed by callers.</span></div><div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  promise-><a class="code" href="classprocess_1_1Promise.html#a8f50fcfd7ddb6dd39ec2cd468377cd5d">di
scard</a>();</div><div class="line"><a name="l00166"></a><span class="lineno"> 166</span> </div><div class="line"><a name="l00167"></a><span class="lineno"> 167</span>  <a class="code" href="namespaceprocess.html#a20443908afa3212215166e26065349e5">terminate</a>(<span class="keyword">this</span>);</div><div class="line"><a name="l00168"></a><span class="lineno"> 168</span>  }</div><div class="line"><a name="l00169"></a><span class="lineno"> 169</span> </div><div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  <span class="keywordtype">void</span> waited(<span class="keyword">const</span> <a class="code" href="classprocess_1_1Future.html">Future<T></a>& future)</div><div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  {</div><div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  <span class="keywordflow">if</span> (future.<a class="code" href="classprocess_1_1Future.h
tml#a493227e57f8848e37777b89c0f81e2ec">isFailed</a>()) {</div><div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  promise-><a class="code" href="classprocess_1_1Promise.html#a2fc569c8bf99acb3e53a68ff3b266667">fail</a>(<span class="stringliteral">"Collect failed: "</span> + future.<a class="code" href="classprocess_1_1Future.html#ae649c56b07f44c05e4b7aa3620133ff9">failure</a>());</div><div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  <a class="code" href="namespaceprocess.html#a20443908afa3212215166e26065349e5">terminate</a>(<span class="keyword">this</span>);</div><div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (future.<a class="code" href="classprocess_1_1Future.html#abc89036db733a417b7b383b091efaf3c">isDiscarded</a>()) {</div><div class="line"><a name="l00176"></a><span class="lineno"> 176</spa
n>  promise-><a class="code" href="classprocess_1_1Promise.html#a2fc569c8bf99acb3e53a68ff3b266667">fail</a>(<span class="stringliteral">"Collect failed: future discarded"</span>);</div><div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  <a class="code" href="namespaceprocess.html#a20443908afa3212215166e26065349e5">terminate</a>(<span class="keyword">this</span>);</div><div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  } <span class="keywordflow">else</span> {</div><div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  <a class="code" href="libprocess_2include_2process_2check_8hpp.html#a55bf53e1f554470600774a6bf0c09140">CHECK_READY</a>(future);</div><div class="line"><a name="l00180"></a><span class="lineno"> 180</span>  ready += 1;</div><div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  <span class="keywordflow">if</span> (rea
dy == futures.size()) {</div><div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  std::list<T> values;</div><div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  <span class="keywordflow">foreach</span> (<span class="keyword">const</span> <a class="code" href="classprocess_1_1Future.html">Future<T></a>& future, futures) {</div><div class="line"><a name="l00184"></a><span class="lineno"> 184</span>  values.push_back(future.<a class="code" href="classprocess_1_1Future.html#aa78977d3b585a5f5ccd682c1e9e2ddc4">get</a>());</div><div class="line"><a name="l00185"></a><span class="lineno"> 185</span>  }</div><div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  promise-><a class="code" href="classprocess_1_1Promise.html#a989b8dfa7eb2633de3f0f25ac2b87943">set</a>(values);</div><div class="line"><a name="l00187"></a><span class="lineno"> 187</span>&#
160; <a class="code" href="namespaceprocess.html#a20443908afa3212215166e26065349e5">terminate</a>(<span class="keyword">this</span>);</div><div class="line"><a name="l00188"></a><span class="lineno"> 188</span>  }</div><div class="line"><a name="l00189"></a><span class="lineno"> 189</span>  }</div><div class="line"><a name="l00190"></a><span class="lineno"> 190</span>  }</div><div class="line"><a name="l00191"></a><span class="lineno"> 191</span> </div><div class="line"><a name="l00192"></a><span class="lineno"> 192</span>  <span class="keyword">const</span> std::vector<Future<T>> futures;</div><div class="line"><a name="l00193"></a><span class="lineno"> 193</span>  <a class="code" href="classprocess_1_1Promise.html">Promise<std::list<T></a>>* promise;</div><div class="line"><a name="l00194"></a><span class="lineno"> 194</span>  <span class="keywordtype">size_t</span> ready;</div><div class="line"><
a name="l00195"></a><span class="lineno"> 195</span> };</div><div class="line"><a name="l00196"></a><span class="lineno"> 196</span> </div><div class="line"><a name="l00197"></a><span class="lineno"> 197</span> </div><div class="line"><a name="l00198"></a><span class="lineno"> 198</span> <span class="keyword">template</span> <<span class="keyword">typename</span> T></div><div class="line"><a name="l00199"></a><span class="lineno"><a class="line" href="classprocess_1_1internal_1_1AwaitProcess.html"> 199</a></span> <span class="keyword">class </span><a class="code" href="classprocess_1_1internal_1_1AwaitProcess.html">AwaitProcess</a> : <span class="keyword">public</span> <a class="code" href="classprocess_1_1Process.html">Process</a><AwaitProcess<T>></div><div class="line"><a name="l00200"></a><span class="lineno"> 200</span> {</div><div class="line"><a name="l00201"></a><span class="lineno"> 201</span> <span class="keyword">
public</span>:</div><div class="line"><a name="l00202"></a><span class="lineno"><a class="line" href="classprocess_1_1internal_1_1AwaitProcess.html#a3c7eb50fa22cee33c4a23485d08866d8"> 202</a></span>  <a class="code" href="classprocess_1_1internal_1_1AwaitProcess.html#a3c7eb50fa22cee33c4a23485d08866d8">AwaitProcess</a>(</div><div class="line"><a name="l00203"></a><span class="lineno"> 203</span>  <span class="keyword">const</span> <a class="code" href="namespacecgroups_1_1devices.html#a22494291bc2cb89697dcd2b5f288bdd3">std::list</a><<a class="code" href="classprocess_1_1Future.html">Future<T></a>>& _futures,</div><div class="line"><a name="l00204"></a><span class="lineno"> 204</span>  <a class="code" href="classprocess_1_1Promise.html">Promise</a><<a class="code" href="namespacecgroups_1_1devices.html#a22494291bc2cb89697dcd2b5f288bdd3">std::list</a><<a class="code" href="classprocess_1_1Future.html">Future<T></a>>>* _prom
ise)</div><div class="line"><a name="l00205"></a><span class="lineno"> 205</span>  : <a class="code" href="classprocess_1_1ProcessBase.html">ProcessBase</a>(ID::<a class="code" href="namespaceprocess_1_1ID.html#aeb11a48c9def1da169d8455a30d0ee39">generate</a>(<span class="stringliteral">"__await__"</span>)),</div><div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  futures(_futures.begin(), _futures.end()),</div><div class="line"><a name="l00207"></a><span class="lineno"> 207</span>  promise(_promise),</div><div class="line"><a name="l00208"></a><span class="lineno"> 208</span>  ready(0) {}</div><div class="line"><a name="l00209"></a><span class="lineno"> 209</span> </div><div class="line"><a name="l00210"></a><span class="lineno"><a class="line" href="classprocess_1_1internal_1_1AwaitProcess.html#ae5d9fc849ff751871f9e476491c4ff15"> 210</a></span>  <span class="keyword">virtual</span> <a class="code"
href="classprocess_1_1internal_1_1AwaitProcess.html#ae5d9fc849ff751871f9e476491c4ff15">~AwaitProcess</a>()</div><div class="line"><a name="l00211"></a><span class="lineno"> 211</span>  {</div><div class="line"><a name="l00212"></a><span class="lineno"> 212</span>  <span class="keyword">delete</span> promise;</div><div class="line"><a name="l00213"></a><span class="lineno"> 213</span>  }</div><div class="line"><a name="l00214"></a><span class="lineno"> 214</span> </div><div class="line"><a name="l00215"></a><span class="lineno"><a class="line" href="classprocess_1_1internal_1_1AwaitProcess.html#a8121fadd91f2221a673d4e711f22c948"> 215</a></span>  <span class="keyword">virtual</span> <span class="keywordtype">void</span> <a class="code" href="classprocess_1_1internal_1_1AwaitProcess.html#a8121fadd91f2221a673d4e711f22c948">initialize</a>()</div><div class="line"><a name="l00216"></a><span class="lineno"> 216</span>  {</div><div class="line"><a
name="l00217"></a><span class="lineno"> 217</span>  <span class="comment">// Stop this nonsense if nobody cares.</span></div><div class="line"><a name="l00218"></a><span class="lineno"> 218</span>  promise->future().onDiscard(<a class="code" href="namespaceprocess.html#a8b27a2ef76eb133bf0ce7a5eea4fb77c">defer</a>(<span class="keyword">this</span>, &AwaitProcess::discarded));</div><div class="line"><a name="l00219"></a><span class="lineno"> 219</span> </div><div class="line"><a name="l00220"></a><span class="lineno"> 220</span>  <span class="keywordflow">foreach</span> (<span class="keyword">const</span> <a class="code" href="classprocess_1_1Future.html">Future<T></a>& future, futures) {</div><div class="line"><a name="l00221"></a><span class="lineno"> 221</span>  future.<a class="code" href="classprocess_1_1Future.html#a71bde220aed3c725cef2040f63adf42a">onAny</a>(<a class="code" href="namespaceprocess.html#a8b27a2ef76eb13
3bf0ce7a5eea4fb77c">defer</a>(<span class="keyword">this</span>, &AwaitProcess::waited, lambda::_1));</div><div class="line"><a name="l00222"></a><span class="lineno"> 222</span>  future.<a class="code" href="classprocess_1_1Future.html#a3ef51b1f7e70860758e47c39ed7660f1">onAbandoned</a>(<a class="code" href="namespaceprocess.html#a8b27a2ef76eb133bf0ce7a5eea4fb77c">defer</a>(<span class="keyword">this</span>, &AwaitProcess::abandoned));</div><div class="line"><a name="l00223"></a><span class="lineno"> 223</span>  }</div><div class="line"><a name="l00224"></a><span class="lineno"> 224</span>  }</div><div class="line"><a name="l00225"></a><span class="lineno"> 225</span> </div><div class="line"><a name="l00226"></a><span class="lineno"> 226</span> <span class="keyword">private</span>:</div><div class="line"><a name="l00227"></a><span class="lineno"> 227</span>  <span class="keywordtype">void</span> abandoned()</div><div class="line"
><a name="l00228"></a><span class="lineno"> 228</span>  {</div><div class="line"><a name="l00229"></a><span class="lineno"> 229</span>  <span class="comment">// There is no use waiting because this future will never complete</span></div><div class="line"><a name="l00230"></a><span class="lineno"> 230</span>  <span class="comment">// so terminate this process which will cause `promise` to get</span></div><div class="line"><a name="l00231"></a><span class="lineno"> 231</span>  <span class="comment">// deleted and our future to also be abandoned.</span></div><div class="line"><a name="l00232"></a><span class="lineno"> 232</span>  <a class="code" href="namespaceprocess.html#a20443908afa3212215166e26065349e5">terminate</a>(<span class="keyword">this</span>);</div><div class="line"><a name="l00233"></a><span class="lineno"> 233</span>  }</div><div class="line"><a name="l00234"></a><span class="lineno"> 234</span> </div><div class="li
ne"><a name="l00235"></a><span class="lineno"> 235</span>  <span class="keywordtype">void</span> <a class="code" href="namespaceprocess_1_1internal.html#aa03406abec646ff3df058f9e55749c11">discarded</a>()</div><div class="line"><a name="l00236"></a><span class="lineno"> 236</span>  {</div><div class="line"><a name="l00237"></a><span class="lineno"> 237</span>  <span class="keywordflow">foreach</span> (<a class="code" href="classprocess_1_1Future.html">Future<T></a> future, futures) {</div><div class="line"><a name="l00238"></a><span class="lineno"> 238</span>  future.<a class="code" href="classprocess_1_1Future.html#a4012f3faa6191fc13874dca62c14ced0">discard</a>();</div><div class="line"><a name="l00239"></a><span class="lineno"> 239</span>  }</div><div class="line"><a name="l00240"></a><span class="lineno"> 240</span> </div><div class="line"><a name="l00241"></a><span class="lineno"> 241</span>  <span class="comment">//
NOTE: we discard the promise after we set discard on each of</span></div><div class="line"><a name="l00242"></a><span class="lineno"> 242</span>  <span class="comment">// the futures so that there is a happens-before relationship that</span></div><div class="line"><a name="l00243"></a><span class="lineno"> 243</span>  <span class="comment">// can be assumed by callers.</span></div><div class="line"><a name="l00244"></a><span class="lineno"> 244</span>  promise->discard();</div><div class="line"><a name="l00245"></a><span class="lineno"> 245</span> </div><div class="line"><a name="l00246"></a><span class="lineno"> 246</span>  <a class="code" href="namespaceprocess.html#a20443908afa3212215166e26065349e5">terminate</a>(<span class="keyword">this</span>);</div><div class="line"><a name="l00247"></a><span class="lineno"> 247</span>  }</div><div class="line"><a name="l00248"></a><span class="lineno"> 248</span> </div><div class="l
ine"><a name="l00249"></a><span class="lineno"> 249</span>  <span class="keywordtype">void</span> waited(<span class="keyword">const</span> <a class="code" href="classprocess_1_1Future.html">Future<T></a>& future)</div><div class="line"><a name="l00250"></a><span class="lineno"> 250</span>  {</div><div class="line"><a name="l00251"></a><span class="lineno"> 251</span>  CHECK(!future.<a class="code" href="classprocess_1_1Future.html#af23884cf963eb5ec061595eb2e288903">isPending</a>());</div><div class="line"><a name="l00252"></a><span class="lineno"> 252</span> </div><div class="line"><a name="l00253"></a><span class="lineno"> 253</span>  ready += 1;</div><div class="line"><a name="l00254"></a><span class="lineno"> 254</span>  <span class="keywordflow">if</span> (ready == futures.size()) {</div><div class="line"><a name="l00255"></a><span class="lineno"> 255</span>  promise->set(</div><div class="line"><a name="l00
256"></a><span class="lineno"> 256</span>  <a class="code" href="namespacecgroups_1_1devices.html#a22494291bc2cb89697dcd2b5f288bdd3">std::list</a><<a class="code" href="classprocess_1_1Future.html">Future<T></a>>(futures.begin(), futures.end()));</div><div class="line"><a name="l00257"></a><span class="lineno"> 257</span>  <a class="code" href="namespaceprocess.html#a20443908afa3212215166e26065349e5">terminate</a>(<span class="keyword">this</span>);</div><div class="line"><a name="l00258"></a><span class="lineno"> 258</span>  }</div><div class="line"><a name="l00259"></a><span class="lineno"> 259</span>  }</div><div class="line"><a name="l00260"></a><span class="lineno"> 260</span> </div><div class="line"><a name="l00261"></a><span class="lineno"> 261</span>  <span class="keyword">const</span> std::vector<Future<T>> futures;</div><div class="line"><a name="l00262"></a><span class="lineno"> 262</span> 
<a class="code" href="classprocess_1_1Promise.html">Promise<std::list<Future<T></a>>>* promise;</div><div class="line"><a name="l00263"></a><span class="lineno"> 263</span>  <span class="keywordtype">size_t</span> ready;</div><div class="line"><a name="l00264"></a><span class="lineno"> 264</span> };</div><div class="line"><a name="l00265"></a><span class="lineno"> 265</span> </div><div class="line"><a name="l00266"></a><span class="lineno"> 266</span> </div><div class="line"><a name="l00267"></a><span class="lineno"> 267</span> } <span class="comment">// namespace internal {</span></div><div class="line"><a name="l00268"></a><span class="lineno"> 268</span> </div><div class="line"><a name="l00269"></a><span class="lineno"> 269</span> </div><div class="line"><a name="l00270"></a><span class="lineno"> 270</span> <span class="keyword">template</span> <<span class="keyword">typename</span> T></div><div class="lin
e"><a name="l00271"></a><span class="lineno"><a class="line" href="namespaceprocess.html#a0f89a937c1caa20e3048e16aeb0c9736"> 271</a></span> <span class="keyword">inline</span> <a class="code" href="classprocess_1_1Future.html">Future<std::list<T></a>> <a class="code" href="namespaceprocess.html#a0f89a937c1caa20e3048e16aeb0c9736">collect</a>(</div><div class="line"><a name="l00272"></a><span class="lineno"> 272</span>  <span class="keyword">const</span> <a class="code" href="namespacecgroups_1_1devices.html#a22494291bc2cb89697dcd2b5f288bdd3">std::list</a><<a class="code" href="classprocess_1_1Future.html">Future<T></a>>& futures)</div><div class="line"><a name="l00273"></a><span class="lineno"> 273</span> {</div><div class="line"><a name="l00274"></a><span class="lineno"> 274</span>  <span class="keywordflow">if</span> (futures.empty()) {</div><div class="line"><a name="l00275"></a><span class="lineno"> 275</span>  <spa
n class="keywordflow">return</span> std::list<T>();</div><div class="line"><a name="l00276"></a><span class="lineno"> 276</span>  }</div><div class="line"><a name="l00277"></a><span class="lineno"> 277</span> </div><div class="line"><a name="l00278"></a><span class="lineno"> 278</span>  <a class="code" href="classprocess_1_1Promise.html">Promise<std::list<T></a>>* promise = <span class="keyword">new</span> <a class="code" href="classprocess_1_1Promise.html">Promise<std::list<T></a>>();</div><div class="line"><a name="l00279"></a><span class="lineno"> 279</span>  <a class="code" href="classprocess_1_1Future.html">Future<std::list<T></a>> future = promise->future();</div><div class="line"><a name="l00280"></a><span class="lineno"> 280</span>  <a class="code" href="namespaceprocess.html#aff22904a83567125d3b4d0d88e5a2270">spawn</a>(<span class="keyword">new</span> <a class="code" href="classprocess_1_1interna
l_1_1CollectProcess.html">internal::CollectProcess<T></a>(futures, promise), <span class="keyword">true</span>);</div><div class="line"><a name="l00281"></a><span class="lineno"> 281</span>  <span class="keywordflow">return</span> future;</div><div class="line"><a name="l00282"></a><span class="lineno"> 282</span> }</div><div class="line"><a name="l00283"></a><span class="lineno"> 283</span> </div><div class="line"><a name="l00284"></a><span class="lineno"> 284</span> </div><div class="line"><a name="l00285"></a><span class="lineno"> 285</span> <span class="keyword">template</span> <<span class="keyword">typename</span>... Ts></div><div class="line"><a name="l00286"></a><span class="lineno"><a class="line" href="namespaceprocess.html#a6f599ec39a0b29f140d3556dda0940f7"> 286</a></span> <a class="code" href="classprocess_1_1Future.html">Future</a><std::tuple<Ts...>> <a class="code" href="namespaceprocess.html#a0f89a937c1caa20
e3048e16aeb0c9736">collect</a>(<span class="keyword">const</span> <a class="code" href="classprocess_1_1Future.html">Future<Ts></a>&... futures)</div><div class="line"><a name="l00287"></a><span class="lineno"> 287</span> {</div><div class="line"><a name="l00288"></a><span class="lineno"> 288</span>  std::list<Future<Nothing>> wrappers = {</div><div class="line"><a name="l00289"></a><span class="lineno"> 289</span>  futures.<a class="code" href="classprocess_1_1Future.html#a269dcc23e03e8868067c24fe70b65a41">then</a>([]() { <span class="keywordflow">return</span> <a class="code" href="structNothing.html">Nothing</a>(); })...</div><div class="line"><a name="l00290"></a><span class="lineno"> 290</span>  };</div><div class="line"><a name="l00291"></a><span class="lineno"> 291</span> </div><div class="line"><a name="l00292"></a><span class="lineno"> 292</span>  <span class="comment">// TODO(klueska): Unfortunately, we have t
o use a lambda followed</span></div><div class="line"><a name="l00293"></a><span class="lineno"> 293</span>  <span class="comment">// by a bind here because of a bug in gcc 4.8 to handle variadic</span></div><div class="line"><a name="l00294"></a><span class="lineno"> 294</span>  <span class="comment">// parameters in lambdas:</span></div><div class="line"><a name="l00295"></a><span class="lineno"> 295</span>  <span class="comment">// https://gcc.gnu.org/bugzilla/show_bug.cgi?id=47226</span></div><div class="line"><a name="l00296"></a><span class="lineno"> 296</span>  <span class="keyword">auto</span> <a class="code" href="namespaceprocess.html#a62d5333e8ec1817c249cf83e15d568b4">f</a> = [](<span class="keyword">const</span> <a class="code" href="classprocess_1_1Future.html">Future<Ts></a>&... futures) {</div><div class="line"><a name="l00297"></a><span class="lineno"> 297</span>  <span class="keywordflow">return</span> std::make_tup
le(futures.<a class="code" href="classprocess_1_1Future.html#aa78977d3b585a5f5ccd682c1e9e2ddc4">get</a>()...);</div><div class="line"><a name="l00298"></a><span class="lineno"> 298</span>  };</div><div class="line"><a name="l00299"></a><span class="lineno"> 299</span> </div><div class="line"><a name="l00300"></a><span class="lineno"> 300</span>  <span class="keywordflow">return</span> <a class="code" href="namespaceprocess.html#a0f89a937c1caa20e3048e16aeb0c9736">collect</a>(wrappers)</div><div class="line"><a name="l00301"></a><span class="lineno"> 301</span>  .<a class="code" href="classprocess_1_1Future.html#a269dcc23e03e8868067c24fe70b65a41">then</a>(<a class="code" href="namespaceprocess_1_1network.html#ad067110a4b38cc83785a43f49bf6c8e2">std::bind</a>(<a class="code" href="namespaceprocess.html#a62d5333e8ec1817c249cf83e15d568b4">f</a>, futures...));</div><div class="line"><a name="l00302"></a><span class="lineno"> 302</span> }</div><div class="
line"><a name="l00303"></a><span class="lineno"> 303</span> </div><div class="line"><a name="l00304"></a><span class="lineno"> 304</span> </div><div class="line"><a name="l00305"></a><span class="lineno"> 305</span> <span class="keyword">template</span> <<span class="keyword">typename</span> T></div><div class="line"><a name="l00306"></a><span class="lineno"><a class="line" href="namespaceprocess.html#a9244f063b856adbc7182f8620b01034c"> 306</a></span> <span class="keyword">inline</span> <a class="code" href="classprocess_1_1Future.html">Future<std::list<Future<T></a>>> <a class="code" href="namespaceprocess_1_1internal.html#a45915c2c6b7aea85b1c9a726158f19fc">await</a>(</div><div class="line"><a name="l00307"></a><span class="lineno"> 307</span>  <span class="keyword">const</span> <a class="code" href="namespacecgroups_1_1devices.html#a22494291bc2cb89697dcd2b5f288bdd3">std::list</a><<a class="code" href="classprocess_1_1Futu
re.html">Future<T></a>>& futures)</div><div class="line"><a name="l00308"></a><span class="lineno"> 308</span> {</div><div class="line"><a name="l00309"></a><span class="lineno"> 309</span>  <span class="keywordflow">if</span> (futures.empty()) {</div><div class="line"><a name="l00310"></a><span class="lineno"> 310</span>  <span class="keywordflow">return</span> futures;</div><div class="line"><a name="l00311"></a><span class="lineno"> 311</span>  }</div><div class="line"><a name="l00312"></a><span class="lineno"> 312</span> </div><div class="line"><a name="l00313"></a><span class="lineno"> 313</span>  <a class="code" href="classprocess_1_1Promise.html">Promise<std::list<Future<T></a>>>* promise =</div><div class="line"><a name="l00314"></a><span class="lineno"> 314</span>  <span class="keyword">new</span> <a class="code" href="classprocess_1_1Promise.html">Promise<std::list<Future<T></a>&g
t;>();</div><div class="line"><a name="l00315"></a><span class="lineno"> 315</span>  <a class="code" href="classprocess_1_1Future.html">Future<std::list<Future<T></a>>> future = promise-><a class="code" href="classprocess_1_1Promise.html#a8aef752d6c90cb11e58e3166b7592ef1">future</a>();</div><div class="line"><a name="l00316"></a><span class="lineno"> 316</span>  <a class="code" href="namespaceprocess.html#aff22904a83567125d3b4d0d88e5a2270">spawn</a>(<span class="keyword">new</span> <a class="code" href="classprocess_1_1internal_1_1AwaitProcess.html">internal::AwaitProcess<T></a>(futures, promise), <span class="keyword">true</span>);</div><div class="line"><a name="l00317"></a><span class="lineno"> 317</span>  <span class="keywordflow">return</span> future;</div><div class="line"><a name="l00318"></a><span class="lineno"> 318</span> }</div><div class="line"><a name="l00319"></a><span class="lineno"> 319</span> </div><div
class="line"><a name="l00320"></a><span class="lineno"> 320</span> </div><div class="line"><a name="l00321"></a><span class="lineno"> 321</span> <span class="keyword">template</span> <<span class="keyword">typename</span>... Ts></div><div class="line"><a name="l00322"></a><span class="lineno"><a class="line" href="namespaceprocess.html#a798bdf13d396404bbf4cd7bb9d25c62c"> 322</a></span> <a class="code" href="classprocess_1_1Future.html">Future<std::tuple<Future<Ts></a>...>> <a class="code" href="namespaceprocess_1_1internal.html#a45915c2c6b7aea85b1c9a726158f19fc">await</a>(<span class="keyword">const</span> <a class="code" href="classprocess_1_1Future.html">Future<Ts></a>&... futures)</div><div class="line"><a name="l00323"></a><span class="lineno"> 323</span> {</div><div class="line"><a name="l00324"></a><span class="lineno"> 324</span>  std::list<Future<Nothing>> wrappers = {</div><div class="line"><a name
="l00325"></a><span class="lineno"> 325</span>  futures.<a class="code" href="classprocess_1_1Future.html#a269dcc23e03e8868067c24fe70b65a41">then</a>([]() { <span class="keywordflow">return</span> <a class="code" href="structNothing.html">Nothing</a>(); })...</div><div class="line"><a name="l00326"></a><span class="lineno"> 326</span>  };</div><div class="line"><a name="l00327"></a><span class="lineno"> 327</span> </div><div class="line"><a name="l00328"></a><span class="lineno"> 328</span>  <span class="comment">// TODO(klueska): Unfortunately, we have to use a lambda followed</span></div><div class="line"><a name="l00329"></a><span class="lineno"> 329</span>  <span class="comment">// by a bind here because of a bug in gcc 4.8 to handle variadic</span></div><div class="line"><a name="l00330"></a><span class="lineno"> 330</span>  <span class="comment">// parameters in lambdas:</span></div><div class="line"><a name="l00331"></a><span class="
lineno"> 331</span>  <span class="comment">// https://gcc.gnu.org/bugzilla/show_bug.cgi?id=47226</span></div><div class="line"><a name="l00332"></a><span class="lineno"> 332</span>  <span class="keyword">auto</span> <a class="code" href="namespaceprocess.html#a62d5333e8ec1817c249cf83e15d568b4">f</a> = [](<span class="keyword">const</span> <a class="code" href="classprocess_1_1Future.html">Future<Ts></a>&... futures) {</div><div class="line"><a name="l00333"></a><span class="lineno"> 333</span>  <span class="keywordflow">return</span> std::make_tuple(futures...);</div><div class="line"><a name="l00334"></a><span class="lineno"> 334</span>  };</div><div class="line"><a name="l00335"></a><span class="lineno"> 335</span> </div><div class="line"><a name="l00336"></a><span class="lineno"> 336</span>  <span class="keywordflow">return</span> <a class="code" href="namespaceprocess_1_1internal.html#a45915c2c6b7aea85b1c9a726158f19fc">awa
it</a>(wrappers)</div><div class="line"><a name="l00337"></a><span class="lineno"> 337</span>  .then(<a class="code" href="namespaceprocess_1_1network.html#ad067110a4b38cc83785a43f49bf6c8e2">std::bind</a>(<a class="code" href="namespaceprocess.html#a62d5333e8ec1817c249cf83e15d568b4">f</a>, futures...));</div><div class="line"><a name="l00338"></a><span class="lineno"> 338</span> }</div><div class="line"><a name="l00339"></a><span class="lineno"> 339</span> </div><div class="line"><a name="l00340"></a><span class="lineno"> 340</span> } <span class="comment">// namespace process {</span></div><div class="line"><a name="l00341"></a><span class="lineno"> 341</span> </div><div class="line"><a name="l00342"></a><span class="lineno"> 342</span> <span class="preprocessor">#endif // __PROCESS_COLLECT_HPP__</span></div><div class="ttc" id="namespaceprocess_1_1ID_html_aeb11a48c9def1da169d8455a30d0ee39"><div class="ttname"><a href="namespaceprocess_1_1ID.h
tml#aeb11a48c9def1da169d8455a30d0ee39">process::ID::generate</a></div><div class="ttdeci">std::string generate(const std::string &prefix="")</div><div class="ttdoc">Returns &#39;prefix(N)&#39; where N represents the number of instances where the same prefix (wrt...</div></div>
+<a href="collect_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> <span class="comment">// Licensed under the Apache License, Version 2.0 (the "License");</span></div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <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> <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> <span class="comment">//</span></div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <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> <span class="comment">//</s
pan></div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <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> <span class="comment">// distributed under the License is distributed on an "AS IS" BASIS,</span></div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <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> <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> <span class="comment">// limitations under the License</span></div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> </div><div class="l
ine"><a name="l00013"></a><span class="lineno"> 13</span> <span class="preprocessor">#ifndef __PROCESS_COLLECT_HPP__</span></div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="preprocessor">#define __PROCESS_COLLECT_HPP__</span></div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> </div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="preprocessor">#include <functional></span></div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="preprocessor">#include <tuple></span></div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="preprocessor">#include <vector></span></div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span> </div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="preprocessor">#include <
<a class="code" href="libprocess_2include_2process_2check_8hpp.html">process/check.hpp</a>></span></div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="preprocessor">#include <<a class="code" href="defer_8hpp.html">process/defer.hpp</a>></span></div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="preprocessor">#include <<a class="code" href="future_8hpp.html">process/future.hpp</a>></span></div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="preprocessor">#include <<a class="code" href="id_8hpp.html">process/id.hpp</a>></span></div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="preprocessor">#include <<a class="code" href="owned_8hpp.html">process/owned.hpp</a>></span></div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="preprocessor">#include
<<a class="code" href="libprocess_2include_2process_2process_8hpp.html">process/process.hpp</a>></span></div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span> </div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="preprocessor">#include <<a class="code" href="lambda_8hpp.html">stout/lambda.hpp</a>></span></div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span> </div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="comment">// TODO(bmahler): Move these into a futures.hpp header to group Future</span></div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="comment">// related utilities.</span></div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span> </div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="keyword">namespace </span><
a class="code" href="namespaceprocess.html">process</a> {</div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span> </div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="comment">// Waits on each future in the specified list and returns the list of</span></div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="comment">// resulting values in the same order. If any future is discarded then</span></div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="comment">// the result will be a failure. Likewise, if any future fails then</span></div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="comment">// the result future will be a failure.</span></div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="keyword">template</span> <<span class="keyword">typename</s
pan> T></div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span> Future<std::vector<T>> <a class="code" href="namespaceprocess.html#a871061d70cd1c8bf39df4d1154cd1857">collect</a>(<span class="keyword">const</span> std::vector<Future<T>>& futures);</div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span> </div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span> </div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="comment">// Waits on each future specified and returns the wrapping future</span></div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="comment">// typed of a tuple of values.</span></div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="keyword">template</span> <<span class="keyword">typename</span>... Ts></div><div class="line"><a name
="l00045"></a><span class="lineno"> 45</span> Future<std::tuple<Ts...>> <a class="code" href="namespaceprocess.html#a871061d70cd1c8bf39df4d1154cd1857">collect</a>(<span class="keyword">const</span> Future<Ts>&... futures);</div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span> </div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span> </div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <span class="comment">// Waits on each future in the specified set and returns the list of</span></div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="comment">// non-pending futures.</span></div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span> <span class="keyword">template</span> <<span class="keyword">typename</span> T></div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span> Future&l
t;std::vector<Future<T>>> <a class="code" href="namespaceprocess.html#a4e2dd66121c628a77b57766a7a276838">await</a>(<span class="keyword">const</span> std::vector<Future<T>>& futures);</div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span> </div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span> </div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span> <span class="comment">// Waits on each future specified and returns the wrapping future</span></div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span> <span class="comment">// typed of a tuple of futures.</span></div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span> <span class="keyword">template</span> <<span class="keyword">typename</span>... Ts></div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span> Future<std::tuple<Future<Ts
>...>> <a class="code" href="namespaceprocess.html#a4e2dd66121c628a77b57766a7a276838">await</a>(<span class="keyword">const</span> Future<Ts>&... futures);</div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span> </div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span> </div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span> <span class="comment">// Waits on the future specified and returns after the future has been</span></div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <span class="comment">// completed or the await has been discarded. This is useful when</span></div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span> <span class="comment">// wanting to "break out" of a future chain if a discard occurs but</span></div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span> <span class="comment
">// the underlying future has not been discarded. For example:</span></div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span> <span class="comment">//</span></div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span> <span class="comment">// Future<string> foo()</span></div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span> <span class="comment">// {</span></div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span> <span class="comment">// return bar()</span></div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span> <span class="comment">// .then([](int i) {</span></div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span> <span class="comment">// return stringify(i);</span></div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span> <span class="comment">// });</span></div><di
v class="line"><a name="l00071"></a><span class="lineno"> 71</span> <span class="comment">// }</span></div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span> <span class="comment">//</span></div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span> <span class="comment">// Future<stringify> future = foo();</span></div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span> <span class="comment">// future.discard();</span></div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span> <span class="comment">//</span></div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span> <span class="comment">// In the above code we'll propagate the discard to `bar()` but might</span></div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span> <span class="comment">// wait forever if `bar()` can't discard their computation. In some</
span></div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span> <span class="comment">// circumstances you might want to break out early and you can do that</span></div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span> <span class="comment">// by using `await`, because if we discard an `await` that function</span></div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span> <span class="comment">// will return even though all of the future's it is waiting on have</span></div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span> <span class="comment">// not been discarded (in other words, the `await` can be properly</span></div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span> <span class="comment">// discarded even if the underlying futures have not been discarded).</span></div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span> 
;<span class="comment">//</span></div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span> <span class="comment">// Future<string> foo()</span></div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span> <span class="comment">// {</span></div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span> <span class="comment">// return await(bar())</span></div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span> <span class="comment">// .recover([](const Future<Future<string>>& future) {</span></div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span> <span class="comment">// if (future.isDiscarded()) {</span></div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span> <span class="comment">// cleanup();</span></div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span> <sp
an class="comment">// }</span></div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span> <span class="comment">// return Failure("Discarded waiting");</span></div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span> <span class="comment">// })</span></div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span> <span class="comment">// .then([](const Future<int>& future) {</span></div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span> <span class="comment">// return future</span></div><div class="line"><a name="l00095"></a><span class="lineno"> 95</span> <span class="comment">// .then([](int i) {</span></div><div class="line"><a name="l00096"></a><span class="lineno"> 96</span> <span class="comment">// return stringify(i);</span></div><div class="line"><a name="l00097"></a><span class="lineno">
97</span> <span class="comment">// });</span></div><div class="line"><a name="l00098"></a><span class="lineno"> 98</span> <span class="comment">// });</span></div><div class="line"><a name="l00099"></a><span class="lineno"> 99</span> <span class="comment">// }</span></div><div class="line"><a name="l00100"></a><span class="lineno"> 100</span> <span class="comment">//</span></div><div class="line"><a name="l00101"></a><span class="lineno"> 101</span> <span class="comment">// Future<string> future = foo();</span></div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span> <span class="comment">// future.discard();</span></div><div class="line"><a name="l00103"></a><span class="lineno"> 103</span> <span class="comment">//</span></div><div class="line"><a name="l00104"></a><span class="lineno"> 104</span> <span class="comment">// Using `await` will enable you to continue execution even if `bar
()`</span></div><div class="line"><a name="l00105"></a><span class="lineno"> 105</span> <span class="comment">// does not (or can not) discard their execution.</span></div><div class="line"><a name="l00106"></a><span class="lineno"> 106</span> <span class="keyword">template</span> <<span class="keyword">typename</span> T></div><div class="line"><a name="l00107"></a><span class="lineno"><a class="line" href="namespaceprocess.html#a9d64abf575bde6dc82f9d915b33743c8"> 107</a></span> <a class="code" href="classprocess_1_1Future.html">Future<Future<T></a>> <a class="code" href="namespaceprocess.html#a4e2dd66121c628a77b57766a7a276838">await</a>(<span class="keyword">const</span> <a class="code" href="classprocess_1_1Future.html">Future<T></a>& future)</div><div class="line"><a name="l00108"></a><span class="lineno"> 108</span> {</div><div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  <span class="keywordflow">
return</span> <a class="code" href="namespaceprocess.html#a4e2dd66121c628a77b57766a7a276838">await</a>(std::vector<<a class="code" href="classprocess_1_1Future.html">Future<T></a>>{future})</div><div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  .<a class="code" href="namespaceprocess_1_1internal.html#a7885011cf6470b707294a6ef4ec7a0a6">then</a>([=]() {</div><div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  <span class="keywordflow">return</span> <a class="code" href="classprocess_1_1Future.html">Future<Future<T></a>>(future);</div><div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  });</div><div class="line"><a name="l00113"></a><span class="lineno"> 113</span> }</div><div class="line"><a name="l00114"></a><span class="lineno"> 114</span> </div><div class="line"><a name="l00115"></a><span class="lineno"> 115</span> </div><div class="line"><a name="
l00116"></a><span class="lineno"><a class="line" href="namespaceprocess_1_1internal.html"> 116</a></span> <span class="keyword">namespace </span><a class="code" href="namespaceinternal.html">internal</a> {</div><div class="line"><a name="l00117"></a><span class="lineno"> 117</span> </div><div class="line"><a name="l00118"></a><span class="lineno"> 118</span> <span class="keyword">template</span> <<span class="keyword">typename</span> T></div><div class="line"><a name="l00119"></a><span class="lineno"><a class="line" href="classprocess_1_1internal_1_1CollectProcess.html"> 119</a></span> <span class="keyword">class </span><a class="code" href="classprocess_1_1internal_1_1CollectProcess.html">CollectProcess</a> : <span class="keyword">public</span> <a class="code" href="classprocess_1_1Process.html">Process</a><CollectProcess<T>></div><div class="line"><a name="l00120"></a><span class="lineno"> 120</span> {</div><div class="line"><a name=
"l00121"></a><span class="lineno"> 121</span> <span class="keyword">public</span>:</div><div class="line"><a name="l00122"></a><span class="lineno"><a class="line" href="classprocess_1_1internal_1_1CollectProcess.html#af00208a3334e48650ebbc034902b1dfe"> 122</a></span>  <a class="code" href="classprocess_1_1internal_1_1CollectProcess.html#af00208a3334e48650ebbc034902b1dfe">CollectProcess</a>(</div><div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  <span class="keyword">const</span> std::vector<<a class="code" href="classprocess_1_1Future.html">Future<T></a>>& _futures,</div><div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  <a class="code" href="classprocess_1_1Promise.html">Promise</a><std::vector<T>>* _promise)</div><div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  : <a class="code" href="classprocess_1_1ProcessBase.html">ProcessBase</a>(ID::<a
class="code" href="namespaceprocess_1_1ID.html#aeb11a48c9def1da169d8455a30d0ee39">generate</a>(<span class="stringliteral">"__collect__"</span>)),</div><div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  futures(_futures),</div><div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  promise(_promise),</div><div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  ready(0) {}</div><div class="line"><a name="l00129"></a><span class="lineno"> 129</span> </div><div class="line"><a name="l00130"></a><span class="lineno"><a class="line" href="classprocess_1_1internal_1_1CollectProcess.html#aef71c5f6f3c016b544805111417573a8"> 130</a></span>  <span class="keyword">virtual</span> <a class="code" href="classprocess_1_1internal_1_1CollectProcess.html#aef71c5f6f3c016b544805111417573a8">~CollectProcess</a>()</div><div class="line"><a name="l00131"></a><span class="lineno"> 131</span>
0; {</div><div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  <span class="keyword">delete</span> promise;</div><div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  }</div><div class="line"><a name="l00134"></a><span class="lineno"> 134</span> </div><div class="line"><a name="l00135"></a><span class="lineno"> 135</span> <span class="keyword">protected</span>:</div><div class="line"><a name="l00136"></a><span class="lineno"><a class="line" href="classprocess_1_1internal_1_1CollectProcess.html#a6e13d430bd37e93903d3f0b4201b8e31"> 136</a></span>  <span class="keyword">virtual</span> <span class="keywordtype">void</span> <a class="code" href="classprocess_1_1internal_1_1CollectProcess.html#a6e13d430bd37e93903d3f0b4201b8e31">initialize</a>()</div><div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  {</div><div class="line"><a name="l00138"></a><span class="lineno"> 138</span> 
<span class="comment">// Stop this nonsense if nobody cares.</span></div><div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  promise-><a class="code" href="classprocess_1_1Promise.html#a8aef752d6c90cb11e58e3166b7592ef1">future</a>().<a class="code" href="classprocess_1_1Future.html#a1b80bf321358be44880d9c6bae5d9a2d">onDiscard</a>(<a class="code" href="namespaceprocess.html#a8b27a2ef76eb133bf0ce7a5eea4fb77c">defer</a>(<span class="keyword">this</span>, &CollectProcess::discarded));</div><div class="line"><a name="l00140"></a><span class="lineno"> 140</span> </div><div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  <span class="keywordflow">foreach</span> (<span class="keyword">const</span> <a class="code" href="classprocess_1_1Future.html">Future<T></a>& future, futures) {</div><div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  future.<a class="code" href="classprocess_
1_1Future.html#a71bde220aed3c725cef2040f63adf42a">onAny</a>(<a class="code" href="namespaceprocess.html#a8b27a2ef76eb133bf0ce7a5eea4fb77c">defer</a>(<span class="keyword">this</span>, &CollectProcess::waited, lambda::_1));</div><div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  future.<a class="code" href="classprocess_1_1Future.html#a3ef51b1f7e70860758e47c39ed7660f1">onAbandoned</a>(<a class="code" href="namespaceprocess.html#a8b27a2ef76eb133bf0ce7a5eea4fb77c">defer</a>(<span class="keyword">this</span>, &CollectProcess::abandoned));</div><div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  }</div><div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  }</div><div class="line"><a name="l00146"></a><span class="lineno"> 146</span> </div><div class="line"><a name="l00147"></a><span class="lineno"> 147</span> <span class="keyword">private</span>:</div><div class="line"><a name="l0
0148"></a><span class="lineno"> 148</span>  <span class="keywordtype">void</span> abandoned()</div><div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  {</div><div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  <span class="comment">// There is no use waiting because this future will never complete</span></div><div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  <span class="comment">// so terminate this process which will cause `promise` to get</span></div><div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  <span class="comment">// deleted and our future to also be abandoned.</span></div><div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  <a class="code" href="namespaceprocess.html#a20443908afa3212215166e26065349e5">terminate</a>(<span class="keyword">this</span>);</div><div class="line"><a name="l00154"></a><span class="lineno">
154</span>  }</div><div class="line"><a name="l00155"></a><span class="lineno"> 155</span> </div><div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  <span class="keywordtype">void</span> discarded()</div><div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  {</div><div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  <span class="keywordflow">foreach</span> (<a class="code" href="classprocess_1_1Future.html">Future<T></a> future, futures) {</div><div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  future.<a class="code" href="classprocess_1_1Future.html#a4012f3faa6191fc13874dca62c14ced0">discard</a>();</div><div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  }</div><div class="line"><a name="l00161"></a><span class="lineno"> 161</span> </div><div class="line"><a name="l00162"></a><span class="lineno"> 162</span> 
<span class="comment">// NOTE: we discard the promise after we set discard on each of</span></div><div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  <span class="comment">// the futures so that there is a happens-before relationship that</span></div><div class="line"><a name="l00164"></a><span class="lineno"> 164</span>  <span class="comment">// can be assumed by callers.</span></div><div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  promise-><a class="code" href="classprocess_1_1Promise.html#a8f50fcfd7ddb6dd39ec2cd468377cd5d">discard</a>();</div><div class="line"><a name="l00166"></a><span class="lineno"> 166</span> </div><div class="line"><a name="l00167"></a><span class="lineno"> 167</span>  <a class="code" href="namespaceprocess.html#a20443908afa3212215166e26065349e5">terminate</a>(<span class="keyword">this</span>);</div><div class="line"><a name="l00168"></a><span class="lineno"> 168<
/span>  }</div><div class="line"><a name="l00169"></a><span class="lineno"> 169</span> </div><div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  <span class="keywordtype">void</span> waited(<span class="keyword">const</span> <a class="code" href="classprocess_1_1Future.html">Future<T></a>& future)</div><div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  {</div><div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  <span class="keywordflow">if</span> (future.<a class="code" href="classprocess_1_1Future.html#a493227e57f8848e37777b89c0f81e2ec">isFailed</a>()) {</div><div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  promise-><a class="code" href="classprocess_1_1Promise.html#a2fc569c8bf99acb3e53a68ff3b266667">fail</a>(<span class="stringliteral">"Collect failed: "</span> + future.<a class="code" href="classprocess_1_1Future.html#ae649c56
b07f44c05e4b7aa3620133ff9">failure</a>());</div><div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  <a class="code" href="namespaceprocess.html#a20443908afa3212215166e26065349e5">terminate</a>(<span class="keyword">this</span>);</div><div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (future.<a class="code" href="classprocess_1_1Future.html#abc89036db733a417b7b383b091efaf3c">isDiscarded</a>()) {</div><div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  promise-><a class="code" href="classprocess_1_1Promise.html#a2fc569c8bf99acb3e53a68ff3b266667">fail</a>(<span class="stringliteral">"Collect failed: future discarded"</span>);</div><div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  <a class="code" href="namespaceprocess.html#a20443908afa3212215166e26065349e5">terminate</a>
(<span class="keyword">this</span>);</div><div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  } <span class="keywordflow">else</span> {</div><div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  <a class="code" href="libprocess_2include_2process_2check_8hpp.html#a55bf53e1f554470600774a6bf0c09140">CHECK_READY</a>(future);</div><div class="line"><a name="l00180"></a><span class="lineno"> 180</span>  ready += 1;</div><div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  <span class="keywordflow">if</span> (ready == futures.size()) {</div><div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  std::vector<T> values;</div><div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  values.reserve(futures.size());</div><div class="line"><a name="l00184"></a><span class="lineno"> 184</span> </div><div class="line"><a name="l
00185"></a><span class="lineno"> 185</span>  <span class="keywordflow">foreach</span> (<span class="keyword">const</span> <a class="code" href="classprocess_1_1Future.html">Future<T></a>& future, futures) {</div><div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  values.push_back(future.<a class="code" href="classprocess_1_1Future.html#aa78977d3b585a5f5ccd682c1e9e2ddc4">get</a>());</div><div class="line"><a name="l00187"></a><span class="lineno"> 187</span>  }</div><div class="line"><a name="l00188"></a><span class="lineno"> 188</span> </div><div class="line"><a name="l00189"></a><span class="lineno"> 189</span>  promise-><a class="code" href="classprocess_1_1Promise.html#a989b8dfa7eb2633de3f0f25ac2b87943">set</a>(std::move(values));</div><div class="line"><a name="l00190"></a><span class="lineno"> 190</span>  <a class="code" href="namespaceprocess.html#a20443908afa3212215166e2
6065349e5">terminate</a>(<span class="keyword">this</span>);</div><div class="line"><a name="l00191"></a><span class="lineno"> 191</span>  }</div><div class="line"><a name="l00192"></a><span class="lineno"> 192</span>  }</div><div class="line"><a name="l00193"></a><span class="lineno"> 193</span>  }</div><div class="line"><a name="l00194"></a><span class="lineno"> 194</span> </div><div class="line"><a name="l00195"></a><span class="lineno"> 195</span>  <span class="keyword">const</span> std::vector<Future<T>> futures;</div><div class="line"><a name="l00196"></a><span class="lineno"> 196</span>  <a class="code" href="classprocess_1_1Promise.html">Promise<std::vector<T></a>>* promise;</div><div class="line"><a name="l00197"></a><span class="lineno"> 197</span>  <span class="keywordtype">size_t</span> ready;</div><div clas
<TRUNCATED>