+namespace simgrid {
+namespace s4u {
+
+Engine *Engine::instance_ = nullptr; /* That singleton is awful, but I don't see no other solution right now. */
+
+
+Engine::Engine(int *argc, char **argv) {
+ xbt_assert(s4u::Engine::instance_ == nullptr, "It is currently forbidden to create more than one instance of s4u::Engine");
+ s4u::Engine::instance_ = this;
+ pimpl = new kernel::EngineImpl();
+
+ TRACE_global_init(argc, argv);
+ SIMIX_global_init(argc, argv);
+}
+
+Engine::~Engine()
+{
+ delete pimpl;
+}
+
+Engine *Engine::instance() {
+ if (s4u::Engine::instance_ == nullptr)
+ new Engine(0,nullptr);
+ return s4u::Engine::instance_;
+}
+
+void Engine::shutdown() {
+ delete s4u::Engine::instance_;
+ s4u::Engine::instance_ = nullptr;
+ delete s4u::Storage::storages_;