#include <madness/world/MADworld.h>
References a, b, SafeMPI::COMM_WORLD, madness::WorldGopInterface::fence(), SafeMPI::Finalize(), madness::Future< T >::get(), madness::World::gop, SafeMPI::Init(), MADNESS_CHECK, print(), madness::World::rand(), madness::World::rank(), and madness::World::size().