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<div class="refentry">
<a name="boost.mpi.status"></a><div class="titlepage"></div>
<div class="refnamediv">
<h2><span class="refentrytitle">Class status</span></h2>
<p>boost::mpi::status &#8212; Contains information about a message that has been or can be received. </p>
</div>
<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
<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="../../mpi/reference.html#header.boost.mpi.status_hpp" title="Header &lt;boost/mpi/status.hpp&gt;">boost/mpi/status.hpp</a>&gt;

</span>
<span class="keyword">class</span> <a class="link" href="status.html" title="Class status">status</a> <span class="special">{</span>
<span class="keyword">public</span><span class="special">:</span>
  <span class="comment">// <a class="link" href="status.html#boost.mpi.statusconstruct-copy-destruct">construct/copy/destruct</a></span>
  <a class="link" href="status.html#idm45506995239536-bb"><span class="identifier">status</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
  <a class="link" href="status.html#idm45506995239248-bb"><span class="identifier">status</span></a><span class="special">(</span><span class="identifier">MPI_Status</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>

  <span class="comment">// <a class="link" href="status.html#idm45506991756416-bb">public member functions</a></span>
  <span class="keyword">int</span> <a class="link" href="status.html#idm45506991755856-bb"><span class="identifier">source</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  <span class="keyword">int</span> <a class="link" href="status.html#idm45506993582480-bb"><span class="identifier">tag</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  <span class="keyword">int</span> <a class="link" href="status.html#idm45506993580928-bb"><span class="identifier">error</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  <span class="keyword">bool</span> <a class="link" href="status.html#idm45506993579376-bb"><span class="identifier">cancelled</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">&gt;</span> <span class="identifier">optional</span><span class="special">&lt;</span> <span class="keyword">int</span> <span class="special">&gt;</span> <a class="link" href="status.html#idm45506993577760-bb"><span class="identifier">count</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  <a class="link" href="status.html#idm45506995243424-bb"><span class="keyword">operator</span> <span class="identifier">MPI_Status</span> <span class="special">&amp;</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
  <a class="link" href="status.html#idm45506995241696-bb"><span class="keyword">operator</span> <span class="keyword">const</span> <span class="identifier">MPI_Status</span> <span class="special">&amp;</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>

  <span class="comment">// public data members</span>
  <span class="keyword">mutable</span> <span class="keyword">int</span> <span class="identifier">m_count</span><span class="special">;</span>
<span class="special">}</span><span class="special">;</span></pre></div>
<div class="refsect1">
<a name="idm45555219001008"></a><h2>Description</h2>
<p>This structure contains status information about messages that have been received (with <code class="computeroutput">communicator::recv</code>) or can be received (returned from <code class="computeroutput">communicator::probe</code> or <code class="computeroutput">communicator::iprobe</code>). It permits access to the source of the message, message tag, error code (rarely used), or the number of elements that have been transmitted. </p>
<div class="refsect2">
<a name="idm45555218997920"></a><h3>
<a name="boost.mpi.statusconstruct-copy-destruct"></a><code class="computeroutput">status</code> 
        public
       construct/copy/destruct</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem"><pre class="literallayout"><a name="idm45506995239536-bb"></a><span class="identifier">status</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><a name="idm45506995239248-bb"></a><span class="identifier">status</span><span class="special">(</span><span class="identifier">MPI_Status</span> <span class="keyword">const</span> <span class="special">&amp;</span> s<span class="special">)</span><span class="special">;</span></pre></li>
</ol></div>
</div>
<div class="refsect2">
<a name="idm45555218986336"></a><h3>
<a name="idm45506991756416-bb"></a><code class="computeroutput">status</code> public member functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><span class="keyword">int</span> <a name="idm45506991755856-bb"></a><span class="identifier">source</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<p>Retrieve the source of the message. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">int</span> <a name="idm45506993582480-bb"></a><span class="identifier">tag</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<p>Retrieve the message tag. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">int</span> <a name="idm45506993580928-bb"></a><span class="identifier">error</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<p>Retrieve the error code. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">bool</span> <a name="idm45506993579376-bb"></a><span class="identifier">cancelled</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<p>Determine whether the communication associated with this object has been successfully cancelled. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">&gt;</span> <span class="identifier">optional</span><span class="special">&lt;</span> <span class="keyword">int</span> <span class="special">&gt;</span> <a name="idm45506993577760-bb"></a><span class="identifier">count</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<p>Determines the number of elements of type <code class="computeroutput">T</code> contained in the message. The type <code class="computeroutput">T</code> must have an associated data type, i.e., <code class="computeroutput">is_mpi_datatype&lt;T&gt;</code> must derive <code class="computeroutput">mpl::true_</code>. In cases where the type <code class="computeroutput">T</code> does not match the transmitted type, this routine will return an empty <code class="computeroutput">optional&lt;int&gt;</code>.</p>
<p>
</p>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term">Returns:</span></p></td>
<td><p>the number of <code class="computeroutput">T</code> elements in the message, if it can be determined. </p></td>
</tr></tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><a name="idm45506995243424-bb"></a><span class="keyword">operator</span> <span class="identifier">MPI_Status</span> <span class="special">&amp;</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
<p>References the underlying <code class="computeroutput">MPI_Status</code> </p>
</li>
<li class="listitem">
<pre class="literallayout"><a name="idm45506995241696-bb"></a><span class="keyword">operator</span> <span class="keyword">const</span> <span class="identifier">MPI_Status</span> <span class="special">&amp;</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<p>References the underlying <code class="computeroutput">MPI_Status</code> </p>
</li>
</ol></div>
</div>
</div>
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<td align="right"><div class="copyright-footer">Copyright &#169; 2005-2007 Douglas Gregor,
      Matthias Troyer, Trustees of Indiana University<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">
        http://www.boost.org/LICENSE_1_0.txt </a>)
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