PreReading of MC information on demand.

[u/mrichter/AliRoot.git] / STEER / AliMCEvent.cxx

diff --git a/STEER/AliMCEvent.cxx b/STEER/AliMCEvent.cxx
index e7b687aec4a1e4d7f65c6175f3d6f8f394c555bf..526340e03fb964a5df15a210635e92eb16dd53ac 100644 (file)
--- a/STEER/AliMCEvent.cxx
+++ b/STEER/AliMCEvent.cxx
@@ -636,6 +636,8 @@ Bool_t AliMCEvent::IsPhysicalPrimary(Int_t i)
 
 void AliMCEvent::InitEvent()
 {
+//
+// Initialize the subsidiary event structure
     if (fSubsidiaryEvents) {
        TIter next(fSubsidiaryEvents);
        AliMCEvent* evt;
@@ -659,6 +661,23 @@ void AliMCEvent::InitEvent()
        }
     }
 }
+void AliMCEvent::PreReadAll()                              
+{
+    // Preread the MC information
+    Int_t i;
+    // secondaries
+    for (i = fStack->GetNprimary(); i < fStack->GetNtrack(); i++) 
+    {
+       GetTrack(i);
+    }
+    // primaries
+    for (i = 0; i < fStack->GetNprimary(); i++) 
+    {
+       GetTrack(i);
+    }
+    
+    
+}
 
 
 ClassImp(AliMCEvent)