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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>
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: <<a class="link" href="../../process/reference.html#header.boost.process.group_hpp" title="Header <boost/process/group.hpp>">boost/process/group.hpp</a>>
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>
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#idm45170604682288-bb"><span class="identifier">group</span></a><span class="special">(</span><span class="identifier">group_handle</span> <span class="special">&&</span><span class="special">)</span><span class="special">;</span>
44 <span class="keyword">explicit</span> <a class="link" href="group.html#idm45170604681040-bb"><span class="identifier">group</span></a><span class="special">(</span><span class="identifier">native_handle_t</span> <span class="special">&</span><span class="special">)</span><span class="special">;</span>
45 <a class="link" href="group.html#idm45170604679472-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">&</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#idm45170604677776-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">&&</span><span class="special">)</span><span class="special">;</span>
47 <a class="link" href="group.html#idm45170604676224-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">&</span> <a class="link" href="group.html#idm45170604675376-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">&</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">&</span> <a class="link" href="group.html#idm45170604673104-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">&&</span><span class="special">)</span><span class="special">;</span>
50 <a class="link" href="group.html#idm45170604670976-bb"><span class="special">~</span><span class="identifier">group</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
52 <span class="comment">// <a class="link" href="group.html#idm45170604726976-bb">public member functions</a></span>
53 <span class="keyword">void</span> <a class="link" href="group.html#idm45170604726416-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#idm45170604725280-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#idm45170604723936-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#idm45170604722656-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#idm45170604721232-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#idm45170604720080-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">&</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
59 <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Rep<span class="special">,</span> <span class="keyword">typename</span> Period<span class="special">></span>
60 <span class="keyword">bool</span> <a class="link" href="group.html#idm45170604717728-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"><</span> <span class="identifier">Rep</span><span class="special">,</span> <span class="identifier">Period</span> <span class="special">></span> <span class="special">&</span><span class="special">)</span><span class="special">;</span>
61 <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Rep<span class="special">,</span> <span class="keyword">typename</span> Period<span class="special">></span>
62 <span class="keyword">bool</span> <a class="link" href="group.html#idm45170604713680-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"><</span> <span class="identifier">Rep</span><span class="special">,</span> <span class="identifier">Period</span> <span class="special">></span> <span class="special">&</span><span class="special">,</span>
63 <span class="identifier">std</span><span class="special">::</span><span class="identifier">error_code</span> <span class="special">&</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
64 <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Clock<span class="special">,</span> <span class="keyword">typename</span> Duration<span class="special">></span>
65 <span class="keyword">bool</span> <a class="link" href="group.html#idm45170604709200-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"><</span> <span class="identifier">Clock</span><span class="special">,</span> <span class="identifier">Duration</span> <span class="special">></span> <span class="special">&</span><span class="special">)</span><span class="special">;</span>
66 <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Clock<span class="special">,</span> <span class="keyword">typename</span> Duration<span class="special">></span>
67 <span class="keyword">bool</span> <a class="link" href="group.html#idm45170604705152-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"><</span> <span class="identifier">Clock</span><span class="special">,</span> <span class="identifier">Duration</span> <span class="special">></span> <span class="special">&</span><span class="special">,</span>
68 <span class="identifier">std</span><span class="special">::</span><span class="identifier">error_code</span> <span class="special">&</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#idm45170604700672-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#idm45170604699248-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#idm45170604697552-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#idm45170604696368-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">&</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#idm45170604694016-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">&</span><span class="special">)</span><span class="special">;</span>
74 <span class="keyword">void</span> <a class="link" href="group.html#idm45170604691728-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">&</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">error_code</span> <span class="special">&</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#idm45170604688240-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">&</span><span class="special">)</span><span class="special">;</span>
76 <span class="keyword">bool</span> <a class="link" href="group.html#idm45170604685936-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">&</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">error_code</span> <span class="special">&</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="id-1.3.31.9.14.5.4"></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">
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>
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>
92 <div class="note"><table border="0" summary="Note">
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>
97 <tr><td align="left" valign="top"><p>If a default-constructed group is used before being used in a process launch, the behaviour is undefined.</p></td></tr>
101 <div class="note"><table border="0" summary="Note">
103 <td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../doc/src/images/note.png"></td>
104 <th align="left">Note</th>
106 <tr><td align="left" valign="top"><p>Waiting for groups is currently broken on windows and will most likely result in a dead-lock. </p></td></tr>
110 <div class="refsect2">
111 <a name="id-1.3.31.9.14.5.4.6"></a><h3>
112 <a name="boost.process.groupconstruct-copy-destruct"></a><code class="computeroutput">group</code>
114 construct/copy/destruct</h3>
115 <div class="orderedlist"><ol class="orderedlist" type="1">
116 <li class="listitem"><pre class="literallayout"><span class="keyword">explicit</span> <a name="idm45170604682288-bb"></a><span class="identifier">group</span><span class="special">(</span><span class="identifier">group_handle</span> <span class="special">&&</span> ch<span class="special">)</span><span class="special">;</span></pre></li>
117 <li class="listitem">
118 <pre class="literallayout"><span class="keyword">explicit</span> <a name="idm45170604681040-bb"></a><span class="identifier">group</span><span class="special">(</span><span class="identifier">native_handle_t</span> <span class="special">&</span> handle<span class="special">)</span><span class="special">;</span></pre>Construct the group from a native_handle. </li>
119 <li class="listitem"><pre class="literallayout"><a name="idm45170604679472-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">&</span><span class="special">)</span> <span class="special">=</span> <span class="keyword">delete</span><span class="special">;</span></pre></li>
120 <li class="listitem">
121 <pre class="literallayout"><a name="idm45170604677776-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">&&</span> lhs<span class="special">)</span><span class="special">;</span></pre>Move constructor. </li>
122 <li class="listitem">
123 <pre class="literallayout"><a name="idm45170604676224-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>
124 <li class="listitem"><pre class="literallayout"><a class="link" href="group.html" title="Class group">group</a> <span class="special">&</span> <a name="idm45170604675376-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">&</span><span class="special">)</span> <span class="special">=</span> <span class="keyword">delete</span><span class="special">;</span></pre></li>
125 <li class="listitem">
126 <pre class="literallayout"><a class="link" href="group.html" title="Class group">group</a> <span class="special">&</span> <a name="idm45170604673104-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">&&</span> lhs<span class="special">)</span><span class="special">;</span></pre>Move assign. </li>
127 <li class="listitem">
128 <pre class="literallayout"><a name="idm45170604670976-bb"></a><span class="special">~</span><span class="identifier">group</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
130 <div class="note"><table border="0" summary="Note">
132 <td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../doc/src/images/note.png"></td>
133 <th align="left">Note</th>
135 <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>
142 <div class="refsect2">
143 <a name="id-1.3.31.9.14.5.4.7"></a><h3>
144 <a name="idm45170604726976-bb"></a><code class="computeroutput">group</code> public member functions</h3>
145 <div class="orderedlist"><ol class="orderedlist" type="1">
146 <li class="listitem">
147 <pre class="literallayout"><span class="keyword">void</span> <a name="idm45170604726416-bb"></a><span class="identifier">detach</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>Detach the group. </li>
148 <li class="listitem">
149 <pre class="literallayout"><span class="keyword">void</span> <a name="idm45170604725280-bb"></a><span class="identifier">join</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
150 <p>Join the child. This just calls wait, but that way the naming is similar to std::thread </p>
152 <li class="listitem">
153 <pre class="literallayout"><span class="keyword">bool</span> <a name="idm45170604723936-bb"></a><span class="identifier">joinable</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
154 <p>Check if the child is joinable. </p>
156 <li class="listitem">
157 <pre class="literallayout"><span class="identifier">native_handle_t</span> <a name="idm45170604722656-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>
158 <li class="listitem">
159 <pre class="literallayout"><span class="keyword">void</span> <a name="idm45170604721232-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>
160 <li class="listitem">
161 <pre class="literallayout"><span class="keyword">void</span> <a name="idm45170604720080-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">&</span> ec<span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
162 <p>This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. </p>
164 <li class="listitem">
165 <pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Rep<span class="special">,</span> <span class="keyword">typename</span> Period<span class="special">></span>
166 <span class="keyword">bool</span> <a name="idm45170604717728-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"><</span> <span class="identifier">Rep</span><span class="special">,</span> <span class="identifier">Period</span> <span class="special">></span> <span class="special">&</span> rel_time<span class="special">)</span><span class="special">;</span></pre>
167 <p>Wait for the process group to exit for period of time.
169 <div class="variablelist"><table border="0" class="variablelist compact">
171 <col align="left" valign="top">
175 <td><p><span class="term">Returns:</span></p></td>
176 <td><p>True if all child processes exited while waiting. </p></td>
180 <li class="listitem">
181 <pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Rep<span class="special">,</span> <span class="keyword">typename</span> Period<span class="special">></span>
182 <span class="keyword">bool</span> <a name="idm45170604713680-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"><</span> <span class="identifier">Rep</span><span class="special">,</span> <span class="identifier">Period</span> <span class="special">></span> <span class="special">&</span> rel_time<span class="special">,</span>
183 <span class="identifier">std</span><span class="special">::</span><span class="identifier">error_code</span> <span class="special">&</span> ec<span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
184 <p>This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. </p>
186 <li class="listitem">
187 <pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Clock<span class="special">,</span> <span class="keyword">typename</span> Duration<span class="special">></span>
188 <span class="keyword">bool</span> <a name="idm45170604709200-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"><</span> <span class="identifier">Clock</span><span class="special">,</span> <span class="identifier">Duration</span> <span class="special">></span> <span class="special">&</span> timeout_time<span class="special">)</span><span class="special">;</span></pre>
189 <p>Wait for the process group to exit until a point in time.
191 <div class="variablelist"><table border="0" class="variablelist compact">
193 <col align="left" valign="top">
197 <td><p><span class="term">Returns:</span></p></td>
198 <td><p>True if all child processes exited while waiting. </p></td>
202 <li class="listitem">
203 <pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Clock<span class="special">,</span> <span class="keyword">typename</span> Duration<span class="special">></span>
204 <span class="keyword">bool</span> <a name="idm45170604705152-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"><</span> <span class="identifier">Clock</span><span class="special">,</span> <span class="identifier">Duration</span> <span class="special">></span> <span class="special">&</span> timeout_time<span class="special">,</span>
205 <span class="identifier">std</span><span class="special">::</span><span class="identifier">error_code</span> <span class="special">&</span> ec<span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
206 <p>This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. </p>
208 <li class="listitem">
209 <pre class="literallayout"><span class="keyword">bool</span> <a name="idm45170604700672-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>
210 <li class="listitem">
211 <pre class="literallayout"><span class="keyword">explicit</span> <a name="idm45170604699248-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>
212 <li class="listitem">
213 <pre class="literallayout"><span class="keyword">void</span> <a name="idm45170604697552-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>
214 <li class="listitem">
215 <pre class="literallayout"><span class="keyword">void</span> <a name="idm45170604696368-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">&</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>
218 <li class="listitem">
219 <pre class="literallayout"><span class="keyword">void</span> <a name="idm45170604694016-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">&</span> c<span class="special">)</span><span class="special">;</span></pre>Assign a child process to the group. </li>
220 <li class="listitem">
221 <pre class="literallayout"><span class="keyword">void</span> <a name="idm45170604691728-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">&</span> c<span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">error_code</span> <span class="special">&</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>
224 <li class="listitem">
225 <pre class="literallayout"><span class="keyword">bool</span> <a name="idm45170604688240-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">&</span> c<span class="special">)</span><span class="special">;</span></pre>Check if the child process is in the group. </li>
226 <li class="listitem">
227 <pre class="literallayout"><span class="keyword">bool</span> <a name="idm45170604685936-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">&</span> c<span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">error_code</span> <span class="special">&</span> ec<span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
228 <p>This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. </p>
234 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
235 <td align="left"></td>
236 <td align="right"><div class="copyright-footer">Copyright © 2006-2012 Julio M. Merino Vidal, Ilya Sokolov,
237 Felipe Tanus, Jeff Flinn, Boris Schaeling<br>Copyright © 2016 Klemens D. Morgenstern<p>
238 Distributed under the Boost Software License, Version 1.0. (See accompanying
239 file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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