EvtCyclic3.hh

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/*******************************************************************************
 * Project: BaBar detector at the SLAC PEP-II B-factory
 * Package: EvtGenBase
 *    File: $Id: EvtCyclic3.hh,v 1.2 2007/11/20 08:36:27 pingrg Exp $
 *  Author: Alexei Dvoretskii, [email protected], 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
 
  char* c_str(Index i);
  char* c_str(Pair i);
  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