Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. — Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

Function operator==

boost::mpi::operator== — Determines whether two process groups are identical.

BOOST_MPI_DECL bool operator==(const group & g1, const group & g2);

Equivalent to calling MPI_Group_compare and checking whether the result is MPI_IDENT.

Returns:

True when the two process groups contain the same processes in the same order.