/* The topo part of MPI_COMM_WORLD should always be nullptr. When other topologies will be implemented, not only should we
* check if the topology is nullptr, but we should check if it is the good topology type (so we have to add a
/* The topo part of MPI_COMM_WORLD should always be nullptr. When other topologies will be implemented, not only should we
* check if the topology is nullptr, but we should check if it is the good topology type (so we have to add a