for (int i = 0; i < receivers_count; i++)
mboxes.push_back(simgrid::s4u::Mailbox::by_name(std::string("receiver-") + std::to_string(i)));
for (int i = 0; i < receivers_count; i++)
mboxes.push_back(simgrid::s4u::Mailbox::by_name(std::string("receiver-") + std::to_string(i)));