AliDecayer realisation for the EvtGen code and EvtGen itself.

[u/mrichter/AliRoot.git] / TEvtGen / EvtGenBase / EvtCyclic3.hh

diff --git a/TEvtGen/EvtGenBase/EvtCyclic3.hh b/TEvtGen/EvtGenBase/EvtCyclic3.hh
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+/*******************************************************************************
+ * Project: BaBar detector at the SLAC PEP-II B-factory
+ * Package: EvtGenBase
+ *    File: $Id: EvtCyclic3.hh,v 1.12 2009/02/15 18:09:01 ryd Exp $
+ *  Author: Alexei Dvoretskii, dvoretsk@slac.stanford.edu, 2001-2002
+ *
+ * Copyright (C) 2002 Caltech
+ *******************************************************************************/
+
+// Cyclic permutations of three indices A,B,C and their parings
+
+#ifndef EVT_CYCLIC3_HH
+#define EVT_CYCLIC3_HH
+
+#include <iosfwd>
+
+namespace EvtCyclic3 {
+
+
+  enum Index {A=0,B=1,C=2};
+  enum Pair  {BC=0,CB=BC,CA=1,AC=CA,AB=2,BA=AB}; 
+  enum Perm {ABC=0,BCA=1,CAB=2,CBA=3,BAC=4,ACB=5};
+
+  // Permutations (multiplication is not transitive)
+
+  Index permute(Index i, Perm p);
+  Perm  permutation(Index i1,Index i2,Index i3);
+  Perm  permute(Perm i, Perm p);
+  Pair permute(Pair i, Perm p); 
+
+  Pair i2pair(int i);
+  
+  // Index-to-index
+
+  Index prev(Index i); 
+  Index next(Index i) ;
+  Index other(Index i, Index j);
+ 
+  // Index-to-pair
+
+  Pair other(Index i); 
+  Pair combine(Index i, Index j);
+
+
+  // Pair-to-pair conversions
+
+  Pair prev(Pair i);
+  Pair next(Pair i);
+  Pair other(Pair i, Pair j);
+  
+  // Pair-to-index conversions
+
+
+  Index first(Pair i);
+  Index second(Pair i); 
+  Index other(Pair i) ;
+  Index common(Pair i, Pair j);
+
+  // String to Index, Pair
+
+  Index strToIndex(const char* str);
+  Pair   strToPair(const char* str);
+
+  // To string conversions
+
+  const char* c_str(Index i);
+  const char* c_str(Pair i);
+  const char* c_str(Perm i);
+
+  // Useful name strings
+
+  char* append(const char* str, EvtCyclic3::Index i);
+  char* append(const char* str, EvtCyclic3::Pair i);
+
+}
+
+//where should these go?
+//ostream& operator<<(ostream&, EvtCyclic3::Index);
+//ostream& operator<<(ostream&, EvtCyclic3::Pair);
+
+#endif