XBT_LOG_EXTERNAL_CATEGORY(surf_route);
-std::map<std::string, simgrid::s4u::Host*> host_list; // FIXME: move it to Engine
-
int USER_HOST_LEVEL = -1;
namespace simgrid {
namespace s4u {
+std::map<std::string, simgrid::s4u::Host*> host_list; // FIXME: move it to Engine
+
simgrid::xbt::signal<void(Host&)> Host::onCreation;
simgrid::xbt::signal<void(Host&)> Host::onDestruction;
simgrid::xbt::signal<void(Host&)> Host::onStateChange;