include/EvtGenBase/EvtDalitzCoord.hh

0001
0002 /***********************************************************************
0003 * Copyright 1998-2020 CERN for the benefit of the EvtGen authors       *
0004 *                                                                      *
0005 * This file is part of EvtGen.                                         *
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0020
0021 #ifndef EVT_DALITZ_COORD_HH
0022 #define EVT_DALITZ_COORD_HH
0023
0024 #include "EvtGenBase/EvtCyclic3.hh"
0025
0026 #include <iostream>
0027
0028 // Two dimensional coordinate of a point in a Dalitz plot
0029
0030 class EvtDalitzCoord final {
0031   public:
0032     // ctor, dtor
0033
0034     EvtDalitzCoord();
0035     EvtDalitzCoord( EvtCyclic3::Pair i1, double q1, EvtCyclic3::Pair i2,
0036                     double q2 );
0037     EvtDalitzCoord( const EvtDalitzCoord& other );
0038
0039     inline EvtCyclic3::Pair pair1() const { return _i1; }
0040     inline EvtCyclic3::Pair pair2() const { return _i2; }
0041     inline double q1() const { return _q1; }
0042     inline double q2() const { return _q2; }
0043
0044     // It's nice to have an equality operator for
0045     // a coordinate. However, beware effects of numerical precision
0046
0047     bool operator==( const EvtDalitzCoord& ) const;
0048
0049     void print( std::ostream& ) const;
0050
0051   private:
0052     // Two coordinates define the point
0053
0054     EvtCyclic3::Pair _i1;
0055     EvtCyclic3::Pair _i2;
0056
0057     double _q1;
0058     double _q2;
0059 };
0060
0061 std::ostream& operator<<( std::ostream&, const EvtDalitzCoord& );
0062
0063 #endif