[1] | 1 | ////////////////////////////////////////////////////////////////////////// |
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| 2 | // SimpleVector.h |
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| 3 | ////////////////////////////////////////////////////////////////////////// |
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| 4 | #ifndef HEPMC_SIMPLEVECTOR_H |
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| 5 | #define HEPMC_SIMPLEVECTOR_H |
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| 6 | |
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| 7 | ////////////////////////////////////////////////////////////////////////// |
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| 8 | // garren@fnal.gov, July 2006 |
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| 9 | // |
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| 10 | // This header provides a place to hold the doubles which are part of one of |
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| 11 | // three types of physics vectors: |
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| 12 | // momentum 4 vector |
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| 13 | // position or displacement 4 vector |
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| 14 | // position or displacement 3 vector |
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| 15 | // |
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| 16 | // For compatibility with existing code, |
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| 17 | // the basic expected geometrical access methods are povided |
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| 18 | // Also, both FourVector and ThreeVector have a templated constructor that will |
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| 19 | // take another vector (HepLorentzVector, GenVector, ...) |
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| 20 | // --> this vector must have the following methods: x(), y(), z() |
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| 21 | // --> FourVector also requires the t() method |
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| 22 | // |
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| 23 | ////////////////////////////////////////////////////////////////////////// |
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| 24 | |
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| 25 | |
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| 26 | #include "HepMC/enable_if.h" |
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| 27 | #include "HepMC/is_arithmetic.h" |
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| 28 | |
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| 29 | |
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| 30 | namespace HepMC { |
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| 31 | |
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| 32 | //! FourVector is a simple representation of a physics 4 vector |
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| 33 | |
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| 34 | /// |
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| 35 | /// \class FourVector |
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| 36 | /// For compatibility with existing code, |
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| 37 | /// the basic expected geometrical access methods are povided. |
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| 38 | /// Also, there is a templated constructor that will |
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| 39 | /// take another vector (HepLorentzVector, GenVector, ...) |
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| 40 | /// which must have the following methods: x(), y(), z(), t(). |
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| 41 | /// |
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| 42 | class FourVector { |
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| 43 | |
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| 44 | public: |
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| 45 | |
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| 46 | /// constructor requiring at least x, y, and z |
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| 47 | FourVector( double xin, double yin, double zin, double tin=0) |
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| 48 | : m_x(xin), m_y(yin), m_z(zin), m_t(tin) {} |
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| 49 | |
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| 50 | /// constructor requiring only t |
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| 51 | FourVector(double tin) |
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| 52 | : m_x(0), m_y(0), m_z(0), m_t(tin) {} |
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| 53 | |
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| 54 | FourVector() |
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| 55 | : m_x(0), m_y(0), m_z(0), m_t(0) {} |
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| 56 | |
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| 57 | /// templated constructor |
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| 58 | /// this is used ONLY if T is not arithmetic |
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| 59 | template <class T > |
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| 60 | FourVector( const T& v, |
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| 61 | typename detail::disable_if< detail::is_arithmetic<T>::value, void >::type * = 0 ) |
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| 62 | : m_x(v.x()), m_y(v.y()), m_z(v.z()), m_t(v.t()) {} |
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| 63 | |
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| 64 | /// copy constructor |
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| 65 | FourVector(const FourVector & v) |
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| 66 | : m_x(v.x()), m_y(v.y()), m_z(v.z()), m_t(v.t()) {} |
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| 67 | |
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| 68 | void swap( FourVector & other ); //!< swap |
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| 69 | |
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| 70 | double px() const { return m_x; } //!< return px |
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| 71 | double py() const { return m_y; } //!< return py |
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| 72 | double pz() const { return m_z; } //!< return pz |
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| 73 | double e() const { return m_t; } //!< return E |
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| 74 | |
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| 75 | double x() const { return m_x; } //!< return x |
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| 76 | double y() const { return m_y; } //!< return y |
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| 77 | double z() const { return m_z; } //!< return z |
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| 78 | double t() const { return m_t; } //!< return t |
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| 79 | |
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| 80 | double m2() const; //!< Invariant mass squared. |
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| 81 | double m() const; //!< Invariant mass. If m2() is negative then -sqrt(-m2()) is returned. |
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| 82 | |
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| 83 | double perp2() const; //!< Transverse component of the spatial vector squared. |
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| 84 | double perp() const; //!< Transverse component of the spatial vector (R in cylindrical system). |
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| 85 | |
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| 86 | // Get spatial vector components in spherical coordinate system. |
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| 87 | double theta() const; //!< The polar angle. |
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| 88 | double phi() const; //!< The azimuth angle. |
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| 89 | double rho() const; //!< spatial vector component magnitude |
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| 90 | |
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| 91 | FourVector & operator = (const FourVector &); //!< make a copy |
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| 92 | |
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| 93 | bool operator == (const FourVector &) const; //!< equality |
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| 94 | bool operator != (const FourVector &) const; //!< inequality |
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| 95 | |
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| 96 | double pseudoRapidity() const; //!< Returns the pseudo-rapidity, i.e. -ln(tan(theta/2)) |
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| 97 | double eta() const; //!< Pseudorapidity (of the space part) |
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| 98 | |
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| 99 | /// set x, y, z, and t |
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| 100 | void set (double x, double y, double z, double t); |
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| 101 | |
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| 102 | void setX(double xin) { m_x=xin; } //!< set x |
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| 103 | void setY(double yin) { m_y=yin; } //!< set y |
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| 104 | void setZ(double zin) { m_z=zin; } //!< set z |
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| 105 | void setT(double tin) { m_t=tin; } //!< set t |
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| 106 | |
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| 107 | void setPx(double xin) { m_x=xin; } //!< set px |
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| 108 | void setPy(double yin) { m_y=yin; } //!< set py |
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| 109 | void setPz(double zin) { m_z=zin; } //!< set pz |
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| 110 | void setE(double tin) { m_t=tin; } //!< set E |
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| 111 | |
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| 112 | private: |
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| 113 | |
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| 114 | double m_x; |
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| 115 | double m_y; |
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| 116 | double m_z; |
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| 117 | double m_t; |
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| 118 | |
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| 119 | }; |
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| 120 | |
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| 121 | //! ThreeVector is a simple representation of a position or displacement 3 vector |
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| 122 | |
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| 123 | /// |
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| 124 | /// \class ThreeVector |
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| 125 | /// For compatibility with existing code, |
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| 126 | /// the basic expected geometrical access methods are povided. |
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| 127 | /// Also, there is a templated constructor that will |
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| 128 | /// take another vector (HepLorentzVector, GenVector, ...) |
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| 129 | /// which must have the following methods: x(), y(), z(). |
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| 130 | /// |
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| 131 | class ThreeVector { |
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| 132 | |
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| 133 | public: |
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| 134 | |
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| 135 | /// construct using x, y, and z (only x is required) |
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| 136 | ThreeVector( double xin, double yin =0, double zin =0 ) |
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| 137 | : m_x(xin), m_y(yin), m_z(zin) {} |
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| 138 | |
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| 139 | ThreeVector( ) |
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| 140 | : m_x(0), m_y(0), m_z(0) {} |
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| 141 | |
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| 142 | /// templated constructor |
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| 143 | /// this is used ONLY if T is not arithmetic |
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| 144 | template <class T > |
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| 145 | ThreeVector( const T& v, |
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| 146 | typename detail::disable_if< detail::is_arithmetic<T>::value, void >::type * = 0 ) |
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| 147 | : m_x(v.x()), m_y(v.y()), m_z(v.z()) {} |
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| 148 | |
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| 149 | /// copy constructor |
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| 150 | ThreeVector(const ThreeVector & v) |
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| 151 | : m_x(v.x()), m_y(v.y()), m_z(v.z()) {} |
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| 152 | |
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| 153 | void swap( ThreeVector & other ); //!< swap |
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| 154 | |
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| 155 | double x() const { return m_x; } //!< return x |
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| 156 | double y() const { return m_y; } //!< return y |
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| 157 | double z() const { return m_z; } //!< return z |
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| 158 | |
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| 159 | void setX(double xin) { m_x=xin; } //!< set x |
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| 160 | void setY(double yin) { m_y=yin; } //!< set y |
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| 161 | void setZ(double zin) { m_z=zin; } //!< set z |
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| 162 | void set( double x, double y, double z); //!< set x, y, and z |
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| 163 | |
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| 164 | double phi() const; //!< The azimuth angle. |
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| 165 | double theta() const; //!< The polar angle. |
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| 166 | double r() const; //!< The magnitude |
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| 167 | |
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| 168 | void setPhi(double); //!< Set phi keeping magnitude and theta constant (BaBar). |
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| 169 | void setTheta(double); //!< Set theta keeping magnitude and phi constant (BaBar). |
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| 170 | |
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| 171 | double perp2() const; //!< The transverse component squared (rho^2 in cylindrical coordinate system). |
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| 172 | double perp() const; //!< The transverse component (rho in cylindrical coordinate system). |
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| 173 | |
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| 174 | ThreeVector & operator = (const ThreeVector &); //!< make a copy |
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| 175 | |
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| 176 | bool operator == (const ThreeVector &) const; //!< equality |
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| 177 | bool operator != (const ThreeVector &) const; //!< inequality |
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| 178 | |
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| 179 | private: |
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| 180 | |
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| 181 | double m_x; |
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| 182 | double m_y; |
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| 183 | double m_z; |
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| 184 | |
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| 185 | }; |
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| 186 | |
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| 187 | |
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| 188 | } // HepMC |
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| 189 | |
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| 190 | #include "HepMC/SimpleVector.icc" |
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| 191 | |
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| 192 | #endif // HEPMC_SIMPLEVECTOR_H |
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| 193 | |
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