Making Instance() create the class

diff --git a/STEER/AliSimulation.h b/STEER/AliSimulation.h
index a53d2fa16f0444f0504c4e27e3f07b93547cb1f9..96f434bcc946e4b92737debc550e43c598783667 100644 (file)
--- a/STEER/AliSimulation.h
+++ b/STEER/AliSimulation.h
@@ -33,7 +33,7 @@ public:
                const char* title = "generation, simulation and digitization");
   virtual ~AliSimulation();
 
-  static AliSimulation *Instance() {return fgInstance;}
+  static AliSimulation *Instance() {if(!fgInstance) fgInstance=new AliSimulation(); return fgInstance;}
 
   void           SetNumberOfEvents(Int_t nEvents);
   void           SetConfigFile(const char* fileName);