std::unordered_map<std::string, simgrid::s4u::Host*> host_list; // FIXME: move it to Engine
-int MSG_HOST_LEVEL = -1;
int USER_HOST_LEVEL = -1;
namespace simgrid {
simgrid::xbt::signal<void(Host&)> Host::onCreation;
simgrid::xbt::signal<void(Host&)> Host::onDestruction;
simgrid::xbt::signal<void(Host&)> Host::onStateChange;
+simgrid::xbt::signal<void(Host&)> Host::onSpeedChange;
Host::Host(const char* name)
: name_(name)