[ALICE3] Pass trackparcov as reference instead of copy in a3 track utilities

ALICE3/Core/TrackUtilities.cxx

@@ -22,15 +22,15 @@
 #include <MathUtils/Utils.h>
 #include <ReconstructionDataFormats/Track.h>
 
 #include <TLorentzVector.h>
 
 #include <array>
 #include <cmath>
 #include <vector>
 
 void o2::upgrade::convertTLorentzVectorToO2Track(const int charge,
-                                                 const TLorentzVector particle,
-                                                 const std::vector<double> productionVertex,
+                                                 const TLorentzVector& particle,
+                                                 const std::vector<double>& productionVertex,
                                                  o2::track::TrackParCov& o2track)
 {
   std::array<float, 5> params;
@@ -48,14 +48,14 @@
   new (&o2track)(o2::track::TrackParCov)(x, particle.Phi(), params, covm);
 }
 
-float o2::upgrade::computeParticleVelocity(float momentum, float mass)
+float o2::upgrade::computeParticleVelocity(const float momentum, const float mass)
 {
   const float a = momentum / mass;
   // uses light speed in cm/ps so output is in those units
   return o2::constants::physics::LightSpeedCm2PS * a / std::sqrt((1.f + a * a));
 }
 
-float o2::upgrade::computeTrackLength(o2::track::TrackParCov track, float radius, float magneticField)
+float o2::upgrade::computeTrackLength(const o2::track::TrackParCov& track, const float radius, const float magneticField)
 {
   // don't make use of the track parametrization
   float length = -100;

ALICE3/Core/TrackUtilities.h

@@ -22,7 +22,7 @@
 
 #include <ReconstructionDataFormats/Track.h>
 
 #include <TLorentzVector.h>
 
 #include <cmath>
 #include <vector>
@@ -35,9 +35,9 @@
 /// \param particle the particle to convert (TLorentzVector)
 /// \param productionVertex where the particle was produced
 /// \param o2track the address of the resulting TrackParCov
 void convertTLorentzVectorToO2Track(const int charge,
-                                    const TLorentzVector particle,
-                                    const std::vector<double> productionVertex,
+                                    const TLorentzVector& particle,
+                                    const std::vector<double>& productionVertex,
                                     o2::track::TrackParCov& o2track);
 
 /// Function to convert a TLorentzVector into a perfect Track
@@ -47,9 +47,9 @@
 /// \param o2track the address of the resulting TrackParCov
 /// \param pdg the pdg service
 template <typename PdgService>
-void convertTLorentzVectorToO2Track(int pdgCode,
-                                    TLorentzVector particle,
-                                    std::vector<double> productionVertex,
+void convertTLorentzVectorToO2Track(const int pdgCode,
+                                    const TLorentzVector& particle,
+                                    const std::vector<double>& productionVertex,
                                     o2::track::TrackParCov& o2track,
                                     const PdgService& pdg)
 {
@@ -58,7 +58,7 @@
   if (pdgInfo != nullptr) {
     charge = pdgInfo->Charge() / 3;
   }
   convertTLorentzVectorToO2Track(charge, particle, productionVertex, o2track);
 }
 
 /// Function to convert a OTFParticle into a perfect Track
@@ -70,7 +70,7 @@
                                  o2::track::TrackParCov& o2track,
                                  const PdgService& pdg)
 {
   static TLorentzVector tlv;
   tlv.SetPxPyPzE(particle.px(), particle.py(), particle.pz(), particle.e());
   convertTLorentzVectorToO2Track(particle.pdgCode(), tlv, {particle.vx(), particle.vy(), particle.vz()}, o2track, pdg);
 }
@@ -80,7 +80,7 @@
 /// \param o2track the address of the resulting TrackParCov
 /// \param pdg the pdg service
 template <typename McParticleType, typename PdgService>
-void convertMCParticleToO2Track(McParticleType& particle,
+void convertMCParticleToO2Track(const McParticleType& particle,
                                 o2::track::TrackParCov& o2track,
                                 const PdgService& pdg)
 {
@@ -94,7 +94,7 @@
 /// \param o2track the address of the resulting TrackParCov
 /// \param pdg the pdg service
 template <typename McParticleType, typename PdgService>
-o2::track::TrackParCov convertMCParticleToO2Track(McParticleType& particle,
+o2::track::TrackParCov convertMCParticleToO2Track(const McParticleType& particle,
                                                   const PdgService& pdg)
 {
   o2::track::TrackParCov o2track;
@@ -105,13 +105,13 @@
 /// returns velocity in centimeters per picoseconds
 /// \param momentum the momentum of the track
 /// \param mass the mass of the particle
-float computeParticleVelocity(float momentum, float mass);
+float computeParticleVelocity(const float momentum, const float mass);
 
 /// function to calculate track length of this track up to a certain radius
 /// \param track the input track (TrackParCov)
 /// \param radius the radius of the layer you're calculating the length to
 /// \param magneticField the magnetic field to use when propagating
-float computeTrackLength(o2::track::TrackParCov track, float radius, float magneticField);
+float computeTrackLength(const o2::track::TrackParCov& track, const float radius, const float magneticField);
 
 } // namespace o2::upgrade