namespace s4u {
+#ifndef DOXYGEN
xbt::signal<void(Host&)> Host::on_creation;
xbt::signal<void(Host const&)> Host::on_destruction;
xbt::signal<void(Host const&)> Host::on_state_change;
xbt::signal<void(Host const&)> Host::on_speed_change;
+#endif
Host* Host::set_cpu(kernel::resource::CpuImpl* cpu)
{