...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
boost::mpi::operator| — Computes the union of two process groups.
// In header: <boost/mpi/group.hpp> BOOST_MPI_DECL group operator|(const group & g1, const group & g2);