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, 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
 
  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 );
 
} // namespace EvtCyclic3
 
// where should these go?
// ostream& operator<<(ostream&, EvtCyclic3::Index);
// ostream& operator<<(ostream&, EvtCyclic3::Pair);
 
#endif