#ifdef __cplusplus
#include <boost/intrusive_ptr.hpp>
-namespace simgrid {
-namespace smpi {
+namespace simgrid::smpi {
class Colls;
class Comm;
class Topo_Dist_Graph;
class Win;
-}
-}
+} // namespace simgrid::smpi
using SMPI_Comm = simgrid::smpi::Comm;
using SMPI_Datatype = simgrid::smpi::Datatype;