
<p>Returns the maximum value that may be used for the <code class="computeroutput">tag</code> parameter of send/receive operations. This value will be somewhat smaller than the value of <code class="computeroutput">MPI_TAG_UB</code>, because the Boost.MPI implementation reserves some tags for collective operations.</p>
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<td><p><span class="term">Returns:</span></p></td>
<td><p>the maximum tag value. </p></td>
<