-XBT_PRIVATE void smpi_deployment_register_process(const char* instance_id, int rank, simgrid::s4u::ActorPtr actor);
-XBT_PRIVATE MPI_Comm* smpi_deployment_comm_world(const char* instance_id);
-XBT_PRIVATE msg_bar_t smpi_deployment_finalization_barrier(const char* instance_id);
+XBT_PRIVATE void smpi_deployment_register_process(const std::string instance_id, int rank,
+ simgrid::s4u::ActorPtr actor);
+XBT_PRIVATE MPI_Comm* smpi_deployment_comm_world(const std::string instance_id);
+XBT_PRIVATE msg_bar_t smpi_deployment_finalization_barrier(const std::string instance_id);