doc/html/boost/process/group.html

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  25 </div>
  26 <div class="refentry">
  27 <a name="boost.process.group"></a><div class="titlepage"></div>
  28 <div class="refnamediv">
  29 <h2><span class="refentrytitle">Class group</span></h2>
  30 <p>boost::process::group</p>
  31 </div>
  32 <h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
  33 <div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: &lt;<a class="link" href="../../process/reference.html#header.boost.process.group_hpp" title="Header &lt;boost/process/group.hpp&gt;">boost/process/group.hpp</a>&gt;
  34
  35 </span>
  36 <span class="keyword">class</span> <a class="link" href="group.html" title="Class group">group</a> <span class="special">{</span>
  37 <span class="keyword">public</span><span class="special">:</span>
  38   <span class="comment">// types</span>
  39   <span class="keyword">typedef</span> <span class="emphasis"><em><span class="identifier">unspecified</span></em></span>            <a name="boost.process.group.group_handle"></a><span class="identifier">group_handle</span><span class="special">;</span>
  40   <span class="keyword">typedef</span> <span class="identifier">group_handle</span><span class="special">::</span><span class="identifier">handle_t</span> <a name="boost.process.group.native_handle_t"></a><span class="identifier">native_handle_t</span><span class="special">;</span>  <span class="comment">// Native representation of the handle. </span>
  41
  42   <span class="comment">// <a class="link" href="group.html#boost.process.groupconstruct-copy-destruct">construct/copy/destruct</a></span>
  43   <span class="keyword">explicit</span> <a class="link" href="group.html#idp25177440-bb"><span class="identifier">group</span></a><span class="special">(</span><span class="identifier">group_handle</span> <span class="special">&amp;&amp;</span><span class="special">)</span><span class="special">;</span>
  44   <span class="keyword">explicit</span> <a class="link" href="group.html#idp25178688-bb"><span class="identifier">group</span></a><span class="special">(</span><span class="identifier">native_handle_t</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  45   <a class="link" href="group.html#idp25180256-bb"><span class="identifier">group</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="group.html" title="Class group">group</a> <span class="special">&amp;</span><span class="special">)</span> <span class="special">=</span> <span class="keyword">delete</span><span class="special">;</span>
  46   <a class="link" href="group.html#idp25181952-bb"><span class="identifier">group</span></a><span class="special">(</span><a class="link" href="group.html" title="Class group">group</a> <span class="special">&amp;&amp;</span><span class="special">)</span><span class="special">;</span>
  47   <a class="link" href="group.html#idp25183504-bb"><span class="identifier">group</span></a><span class="special">(</span><span class="special">)</span> <span class="special">=</span> <span class="keyword">default</span><span class="special">;</span>
  48   <a class="link" href="group.html" title="Class group">group</a> <span class="special">&amp;</span> <a class="link" href="group.html#idp25184352-bb"><span class="keyword">operator</span><span class="special">=</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="group.html" title="Class group">group</a> <span class="special">&amp;</span><span class="special">)</span> <span class="special">=</span> <span class="keyword">delete</span><span class="special">;</span>
  49   <a class="link" href="group.html" title="Class group">group</a> <span class="special">&amp;</span> <a class="link" href="group.html#idp25186624-bb"><span class="keyword">operator</span><span class="special">=</span></a><span class="special">(</span><a class="link" href="group.html" title="Class group">group</a> <span class="special">&amp;&amp;</span><span class="special">)</span><span class="special">;</span>
  50   <a class="link" href="group.html#idp25188752-bb"><span class="special">~</span><span class="identifier">group</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
  51
  52   <span class="comment">// <a class="link" href="group.html#idp25133072-bb">public member functions</a></span>
  53   <span class="keyword">void</span> <a class="link" href="group.html#idp25133632-bb"><span class="identifier">detach</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
  54   <span class="keyword">void</span> <a class="link" href="group.html#idp25134768-bb"><span class="identifier">join</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
  55   <span class="keyword">bool</span> <a class="link" href="group.html#idp25136112-bb"><span class="identifier">joinable</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
  56   <span class="identifier">native_handle_t</span> <a class="link" href="group.html#idp25137392-bb"><span class="identifier">native_handle</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  57   <span class="keyword">void</span> <a class="link" href="group.html#idp25138816-bb"><span class="identifier">wait</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
  58   <span class="keyword">void</span> <a class="link" href="group.html#idp25139968-bb"><span class="identifier">wait</span></a><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">error_code</span> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
  59   <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Rep<span class="special">,</span> <span class="keyword">typename</span> Period<span class="special">&gt;</span>
  60     <span class="keyword">bool</span> <a class="link" href="group.html#idp25142320-bb"><span class="identifier">wait_for</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">chrono</span><span class="special">::</span><span class="identifier">duration</span><span class="special">&lt;</span> <span class="identifier">Rep</span><span class="special">,</span> <span class="identifier">Period</span> <span class="special">&gt;</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  61   <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Rep<span class="special">,</span> <span class="keyword">typename</span> Period<span class="special">&gt;</span>
  62     <span class="keyword">bool</span> <a class="link" href="group.html#idp25146208-bb"><span class="identifier">wait_for</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">chrono</span><span class="special">::</span><span class="identifier">duration</span><span class="special">&lt;</span> <span class="identifier">Rep</span><span class="special">,</span> <span class="identifier">Period</span> <span class="special">&gt;</span> <span class="special">&amp;</span><span class="special">,</span>
  63                   <span class="identifier">std</span><span class="special">::</span><span class="identifier">error_code</span> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
  64   <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Clock<span class="special">,</span> <span class="keyword">typename</span> Duration<span class="special">&gt;</span>
  65     <span class="keyword">bool</span> <a class="link" href="group.html#idp25150688-bb"><span class="identifier">wait_until</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">chrono</span><span class="special">::</span><span class="identifier">time_point</span><span class="special">&lt;</span> <span class="identifier">Clock</span><span class="special">,</span> <span class="identifier">Duration</span> <span class="special">&gt;</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  66   <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Clock<span class="special">,</span> <span class="keyword">typename</span> Duration<span class="special">&gt;</span>
  67     <span class="keyword">bool</span> <a class="link" href="group.html#idp25154576-bb"><span class="identifier">wait_until</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">chrono</span><span class="special">::</span><span class="identifier">time_point</span><span class="special">&lt;</span> <span class="identifier">Clock</span><span class="special">,</span> <span class="identifier">Duration</span> <span class="special">&gt;</span> <span class="special">&amp;</span><span class="special">,</span>
  68                     <span class="identifier">std</span><span class="special">::</span><span class="identifier">error_code</span> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
  69   <span class="keyword">bool</span> <a class="link" href="group.html#idp25159056-bb"><span class="identifier">valid</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  70   <span class="keyword">explicit</span> <a class="link" href="group.html#idp25160480-bb"><span class="keyword">operator</span> <span class="keyword">bool</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  71   <span class="keyword">void</span> <a class="link" href="group.html#idp25162176-bb"><span class="identifier">terminate</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
  72   <span class="keyword">void</span> <a class="link" href="group.html#idp25163360-bb"><span class="identifier">terminate</span></a><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">error_code</span> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
  73   <span class="keyword">void</span> <a class="link" href="group.html#idp25165712-bb"><span class="identifier">add</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="child.html" title="Class child">child</a> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  74   <span class="keyword">void</span> <a class="link" href="group.html#idp25168000-bb"><span class="identifier">add</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="child.html" title="Class child">child</a> <span class="special">&amp;</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">error_code</span> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
  75   <span class="keyword">bool</span> <a class="link" href="group.html#idp25171488-bb"><span class="identifier">has</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="child.html" title="Class child">child</a> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  76   <span class="keyword">bool</span> <a class="link" href="group.html#idp25173792-bb"><span class="identifier">has</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="child.html" title="Class child">child</a> <span class="special">&amp;</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">error_code</span> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
  77 <span class="special">}</span><span class="special">;</span></pre></div>
  78 <div class="refsect1">
  79 <a name="idp433383824"></a><h2>Description</h2>
  80 <p>Represents a process group.</p>
  81 <p>Groups are movable but non-copyable. The destructor automatically closes handles to the group process.</p>
  82 <p>The group will have the same interface as std::thread.</p>
  83 <div class="note"><table border="0" summary="Note">
  84 <tr>
  85 <td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../doc/src/images/note.png"></td>
  86 <th align="left">Note</th>
  87 </tr>
  88 <tr><td align="left" valign="top"><p>If the destructor is called without a previous detach or wait, the group will be terminated.</p></td></tr>
  89 </table></div>
  90 <p>
  91 </p>
  92 <div class="note"><table border="0" summary="Note">
  93 <tr>
  94 <td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../doc/src/images/note.png"></td>
  95 <th align="left">Note</th>
  96 </tr>
  97 <tr><td align="left" valign="top">
  98 <p>If a default-constructed group is used before being used in a process launch, the behaviour is undefined.</p>
  99 <p>Waiting for groups is currently broken on windows and will most likely result in a dead-lock. </p>
 100 </td></tr>
 101 </table></div>
 102 <p>
 103 </p>
 104 <div class="refsect2">
 105 <a name="idp433386992"></a><h3>
 106 <a name="boost.process.groupconstruct-copy-destruct"></a><code class="computeroutput">group</code>
 107         public
 108        construct/copy/destruct</h3>
 109 <div class="orderedlist"><ol class="orderedlist" type="1">
 110 <li class="listitem"><pre class="literallayout"><span class="keyword">explicit</span> <a name="idp25177440-bb"></a><span class="identifier">group</span><span class="special">(</span><span class="identifier">group_handle</span> <span class="special">&amp;&amp;</span> ch<span class="special">)</span><span class="special">;</span></pre></li>
 111 <li class="listitem">
 112 <pre class="literallayout"><span class="keyword">explicit</span> <a name="idp25178688-bb"></a><span class="identifier">group</span><span class="special">(</span><span class="identifier">native_handle_t</span> <span class="special">&amp;</span> handle<span class="special">)</span><span class="special">;</span></pre>Construct the group from a native_handle. </li>
 113 <li class="listitem"><pre class="literallayout"><a name="idp25180256-bb"></a><span class="identifier">group</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="group.html" title="Class group">group</a> <span class="special">&amp;</span><span class="special">)</span> <span class="special">=</span> <span class="keyword">delete</span><span class="special">;</span></pre></li>
 114 <li class="listitem">
 115 <pre class="literallayout"><a name="idp25181952-bb"></a><span class="identifier">group</span><span class="special">(</span><a class="link" href="group.html" title="Class group">group</a> <span class="special">&amp;&amp;</span> lhs<span class="special">)</span><span class="special">;</span></pre>Move constructor. </li>
 116 <li class="listitem">
 117 <pre class="literallayout"><a name="idp25183504-bb"></a><span class="identifier">group</span><span class="special">(</span><span class="special">)</span> <span class="special">=</span> <span class="keyword">default</span><span class="special">;</span></pre>Default constructor. </li>
 118 <li class="listitem"><pre class="literallayout"><a class="link" href="group.html" title="Class group">group</a> <span class="special">&amp;</span> <a name="idp25184352-bb"></a><span class="keyword">operator</span><span class="special">=</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="group.html" title="Class group">group</a> <span class="special">&amp;</span><span class="special">)</span> <span class="special">=</span> <span class="keyword">delete</span><span class="special">;</span></pre></li>
 119 <li class="listitem">
 120 <pre class="literallayout"><a class="link" href="group.html" title="Class group">group</a> <span class="special">&amp;</span> <a name="idp25186624-bb"></a><span class="keyword">operator</span><span class="special">=</span><span class="special">(</span><a class="link" href="group.html" title="Class group">group</a> <span class="special">&amp;&amp;</span> lhs<span class="special">)</span><span class="special">;</span></pre>Move assign. </li>
 121 <li class="listitem">
 122 <pre class="literallayout"><a name="idp25188752-bb"></a><span class="special">~</span><span class="identifier">group</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
 123 <p>Destructor</p>
 124 <div class="note"><table border="0" summary="Note">
 125 <tr>
 126 <td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../doc/src/images/note.png"></td>
 127 <th align="left">Note</th>
 128 </tr>
 129 <tr><td align="left" valign="top"><p>If the destructor is called without a previous detach or wait, the group will be terminated. </p></td></tr>
 130 </table></div>
 131 <p>
 132 </p>
 133 </li>
 134 </ol></div>
 135 </div>
 136 <div class="refsect2">
 137 <a name="idp433439808"></a><h3>
 138 <a name="idp25133072-bb"></a><code class="computeroutput">group</code> public member functions</h3>
 139 <div class="orderedlist"><ol class="orderedlist" type="1">
 140 <li class="listitem">
 141 <pre class="literallayout"><span class="keyword">void</span> <a name="idp25133632-bb"></a><span class="identifier">detach</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>Detach the group. </li>
 142 <li class="listitem">
 143 <pre class="literallayout"><span class="keyword">void</span> <a name="idp25134768-bb"></a><span class="identifier">join</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
 144 <p>Join the child. This just calls wait, but that way the naming is similar to std::thread </p>
 145 </li>
 146 <li class="listitem">
 147 <pre class="literallayout"><span class="keyword">bool</span> <a name="idp25136112-bb"></a><span class="identifier">joinable</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
 148 <p>Check if the child is joinable. </p>
 149 </li>
 150 <li class="listitem">
 151 <pre class="literallayout"><span class="identifier">native_handle_t</span> <a name="idp25137392-bb"></a><span class="identifier">native_handle</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>Obtain the native handle of the group. </li>
 152 <li class="listitem">
 153 <pre class="literallayout"><span class="keyword">void</span> <a name="idp25138816-bb"></a><span class="identifier">wait</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>Wait for the process group to exit. </li>
 154 <li class="listitem">
 155 <pre class="literallayout"><span class="keyword">void</span> <a name="idp25139968-bb"></a><span class="identifier">wait</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">error_code</span> <span class="special">&amp;</span> ec<span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
 156 <p>This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. </p>
 157 </li>
 158 <li class="listitem">
 159 <pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Rep<span class="special">,</span> <span class="keyword">typename</span> Period<span class="special">&gt;</span>
 160   <span class="keyword">bool</span> <a name="idp25142320-bb"></a><span class="identifier">wait_for</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">chrono</span><span class="special">::</span><span class="identifier">duration</span><span class="special">&lt;</span> <span class="identifier">Rep</span><span class="special">,</span> <span class="identifier">Period</span> <span class="special">&gt;</span> <span class="special">&amp;</span> rel_time<span class="special">)</span><span class="special">;</span></pre>
 161 <p>Wait for the process group to exit for period of time.
 162 </p>
 163 <div class="variablelist"><table border="0" class="variablelist compact">
 164 <colgroup>
 165 <col align="left" valign="top">
 166 <col>
 167 </colgroup>
 168 <tbody><tr>
 169 <td><p><span class="term">Returns:</span></p></td>
 170 <td><p>True if all child processes exited while waiting. </p></td>
 171 </tr></tbody>
 172 </table></div>
 173 </li>
 174 <li class="listitem">
 175 <pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Rep<span class="special">,</span> <span class="keyword">typename</span> Period<span class="special">&gt;</span>
 176   <span class="keyword">bool</span> <a name="idp25146208-bb"></a><span class="identifier">wait_for</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">chrono</span><span class="special">::</span><span class="identifier">duration</span><span class="special">&lt;</span> <span class="identifier">Rep</span><span class="special">,</span> <span class="identifier">Period</span> <span class="special">&gt;</span> <span class="special">&amp;</span> rel_time<span class="special">,</span>
 177                 <span class="identifier">std</span><span class="special">::</span><span class="identifier">error_code</span> <span class="special">&amp;</span> ec<span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
 178 <p>This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. </p>
 179 </li>
 180 <li class="listitem">
 181 <pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Clock<span class="special">,</span> <span class="keyword">typename</span> Duration<span class="special">&gt;</span>
 182   <span class="keyword">bool</span> <a name="idp25150688-bb"></a><span class="identifier">wait_until</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">chrono</span><span class="special">::</span><span class="identifier">time_point</span><span class="special">&lt;</span> <span class="identifier">Clock</span><span class="special">,</span> <span class="identifier">Duration</span> <span class="special">&gt;</span> <span class="special">&amp;</span> timeout_time<span class="special">)</span><span class="special">;</span></pre>
 183 <p>Wait for the process group to exit until a point in time.
 184 </p>
 185 <div class="variablelist"><table border="0" class="variablelist compact">
 186 <colgroup>
 187 <col align="left" valign="top">
 188 <col>
 189 </colgroup>
 190 <tbody><tr>
 191 <td><p><span class="term">Returns:</span></p></td>
 192 <td><p>True if all child processes exited while waiting. </p></td>
 193 </tr></tbody>
 194 </table></div>
 195 </li>
 196 <li class="listitem">
 197 <pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Clock<span class="special">,</span> <span class="keyword">typename</span> Duration<span class="special">&gt;</span>
 198   <span class="keyword">bool</span> <a name="idp25154576-bb"></a><span class="identifier">wait_until</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">chrono</span><span class="special">::</span><span class="identifier">time_point</span><span class="special">&lt;</span> <span class="identifier">Clock</span><span class="special">,</span> <span class="identifier">Duration</span> <span class="special">&gt;</span> <span class="special">&amp;</span> timeout_time<span class="special">,</span>
 199                   <span class="identifier">std</span><span class="special">::</span><span class="identifier">error_code</span> <span class="special">&amp;</span> ec<span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
 200 <p>This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. </p>
 201 </li>
 202 <li class="listitem">
 203 <pre class="literallayout"><span class="keyword">bool</span> <a name="idp25159056-bb"></a><span class="identifier">valid</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>Check if the group has a valid handle. </li>
 204 <li class="listitem">
 205 <pre class="literallayout"><span class="keyword">explicit</span> <a name="idp25160480-bb"></a><span class="keyword">operator</span> <span class="keyword">bool</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>Convenience to call valid. </li>
 206 <li class="listitem">
 207 <pre class="literallayout"><span class="keyword">void</span> <a name="idp25162176-bb"></a><span class="identifier">terminate</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>Terminate the process group, i.e. all processes in the group. </li>
 208 <li class="listitem">
 209 <pre class="literallayout"><span class="keyword">void</span> <a name="idp25163360-bb"></a><span class="identifier">terminate</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">error_code</span> <span class="special">&amp;</span> ec<span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
 210 <p>This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. </p>
 211 </li>
 212 <li class="listitem">
 213 <pre class="literallayout"><span class="keyword">void</span> <a name="idp25165712-bb"></a><span class="identifier">add</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="child.html" title="Class child">child</a> <span class="special">&amp;</span> c<span class="special">)</span><span class="special">;</span></pre>Assign a child process to the group. </li>
 214 <li class="listitem">
 215 <pre class="literallayout"><span class="keyword">void</span> <a name="idp25168000-bb"></a><span class="identifier">add</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="child.html" title="Class child">child</a> <span class="special">&amp;</span> c<span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">error_code</span> <span class="special">&amp;</span> ec<span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
 216 <p>This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. </p>
 217 </li>
 218 <li class="listitem">
 219 <pre class="literallayout"><span class="keyword">bool</span> <a name="idp25171488-bb"></a><span class="identifier">has</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="child.html" title="Class child">child</a> <span class="special">&amp;</span> c<span class="special">)</span><span class="special">;</span></pre>Check if the child process is in the group. </li>
 220 <li class="listitem">
 221 <pre class="literallayout"><span class="keyword">bool</span> <a name="idp25173792-bb"></a><span class="identifier">has</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="child.html" title="Class child">child</a> <span class="special">&amp;</span> c<span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">error_code</span> <span class="special">&amp;</span> ec<span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
 222 <p>This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. </p>
 223 </li>
 224 </ol></div>
 225 </div>
 226 </div>
 227 </div>
 228 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 229 <td align="left"></td>
 230 <td align="right"><div class="copyright-footer">Copyright &#169; 2006-2012 Julio M. Merino Vidal, Ilya Sokolov,
 231       Felipe Tanus, Jeff Flinn, Boris Schaeling<br>Copyright &#169; 2016 Klemens D. Morgenstern<p>
 232         Distributed under the Boost Software License, Version 1.0. (See accompanying
 233         file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 234       </p>
 235 </div></td>
 236 </tr></table>
 237 <hr>
 238 <div class="spirit-nav">
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