Additional protection in case of zero magnetic field (Yu.Belikov)

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

diff --git a/STEER/AliRndm.cxx b/STEER/AliRndm.cxx
index bb02a356fd48779d283b51b196bb6e9861045aac..302d644a1fcc4de17ea9250b78cbefa308e1fb69 100644 (file)
--- a/STEER/AliRndm.cxx
+++ b/STEER/AliRndm.cxx
@@ -13,26 +13,53 @@
  * provided "as is" without express or implied warranty.                  *
  **************************************************************************/
 
-/*
-$Log$
-*/
+/* $Id$ */
 
 ///////////////////////////////////////////////////////////////////////////////
-//                                                                           //
-//                                                                           //
+// Random number class for AliRoot
+// This class allows to have different 
+// random number generator for different
+// elements of AliRoot                                                                          //
+// It also allows saving and retrieving of the random number seeds
 ///////////////////////////////////////////////////////////////////////////////
 
-#include "TSystem.h"
 #include "TFile.h"
+#include "TError.h"
+#include "TRandom3.h"
+#include "TSystem.h"
 
 #include "AliRndm.h"
-#include "TRandom3.h"
 
 ClassImp(AliRndm)
 
+//_______________________________________________________________________
+AliRndm::AliRndm():
+  fRandom(gRandom)
+{
+  // 
+  // Default ctor
+  //
+}
+
+//_______________________________________________________________________
+AliRndm::AliRndm(const AliRndm& rn):
+  fRandom(gRandom)
+{
+  //
+  // Copy constructor
+  //
+  rn.Copy(*this);
+}
+
+//_______________________________________________________________________
+void AliRndm::Copy(AliRndm&) const
+{
+  ::Fatal("Copy","Not implemented\n");
+}
+
 
 //_____________________________________________________________________________
-void AliRndm::Rndm(Float_t* array, const Int_t size) const
+void AliRndm::Rndm(Float_t* array, Int_t size) const
 {
   //
   // Return an array of n random numbers uniformly distributed 
@@ -46,16 +73,12 @@ void AliRndm::Rndm(Float_t* array, const Int_t size) const
 #endif
 }
 
-//_____________________________________________________________________________
-void AliRndm::SetRandom(TRandom *ran)
-{
-  if(ran) fRandom=ran;
-  else fRandom=sRandom=gRandom;
-}
-
 //_____________________________________________________________________________
 void AliRndm::ReadRandom(const char *filename)
 {
+  //
+  // Reads saved random generator status from filename
+  //
   char *fntmp = gSystem->ExpandPathName(filename);
   TFile *file = new TFile(fntmp,"r");
   delete [] fntmp;
@@ -72,6 +95,9 @@ void AliRndm::ReadRandom(const char *filename)
 //_____________________________________________________________________________
 void AliRndm::WriteRandom(const char *filename) const
 {
+  //
+  // Writes random generator status to filename
+  //
   char *fntmp = gSystem->ExpandPathName(filename);
   TFile *file = new TFile(fntmp,"new");
   delete [] fntmp;