e class="computeroutput">environment</code> is not mandatory. Users may choose to invoke <code class="computeroutput">MPI_Init</code> and <code class="computeroutput">MPI_Finalize</code> manually. In this case, no <code class="computeroutput">environment</code> object is needed. If one is created, however, it will do nothing on either construction or destruction. </p>
<div class="refsect2">
<a name="idp118322384"></a><h3>
<a name="boost.mpi.environmentconstruct-copy-destruct"></a><code class="computeroutput