stream << ' ' << (comm->src_actor_ != nullptr ? comm->src_actor_->get_pid() : -1);
stream << ' ' << (comm->dst_actor_ != nullptr ? comm->dst_actor_->get_pid() : -1);
stream << ' ' << comm->get_mailbox_id();
stream << ' ' << (uintptr_t)comm->src_buff_ << ' ' << (uintptr_t)comm->dst_buff_ << ' ' << comm->src_buff_size_;
} else {
stream << (short)mc::Transition::Type::UNKNOWN;
stream << ' ' << (comm->src_actor_ != nullptr ? comm->src_actor_->get_pid() : -1);
stream << ' ' << (comm->dst_actor_ != nullptr ? comm->dst_actor_->get_pid() : -1);
stream << ' ' << comm->get_mailbox_id();
stream << ' ' << (uintptr_t)comm->src_buff_ << ' ' << (uintptr_t)comm->dst_buff_ << ' ' << comm->src_buff_size_;
} else {
stream << (short)mc::Transition::Type::UNKNOWN;