p_create</code>) or, if possible, mapped directly to a built-in MPI operation. See <code class="computeroutput"><code class="computeroutput"><a class="link" href="is_mpi_op.html" title="Struct template is_mpi_op">is_mpi_op</a></code></code> in the <code class="computeroutput">operations.hpp</code> header for more details on this mapping. For any non-built-in operation, commutativity will be determined by the <code class="computeroutput">is_commmutative</code> trait (also in <code class="computeroutput">oper