ITS: Tracker add constexpr

Signed-off-by: Felix Schlepper <felix.schlepper@cern.ch>

Author: f3sch

Detectors/ITSMFT/ITS/tracking/include/ITStracking/Tracker.h

@@ -122,7 +122,7 @@ float Tracker::evaluateTask(void (Tracker::*task)(T...), const char* taskName, s
 {
   float diff{0.f};
 
-  if (constants::DoTimeBenchmarks) {
+  if constexpr (constants::DoTimeBenchmarks) {
     auto start = std::chrono::high_resolution_clock::now();
     (this->*task)(std::forward<T>(args)...);
     auto end = std::chrono::high_resolution_clock::now();

Detectors/ITSMFT/ITS/tracking/include/ITStracking/Vertexer.h

@@ -176,7 +176,7 @@ float Vertexer::evaluateTask(void (Vertexer::*task)(T...), const char* taskName,
 {
   float diff{0.f};
 
-  if (constants::DoTimeBenchmarks) {
+  if constexpr (constants::DoTimeBenchmarks) {
     auto start = std::chrono::high_resolution_clock::now();
     (this->*task)(std::forward<T>(args)...);
     auto end = std::chrono::high_resolution_clock::now();

Detectors/ITSMFT/ITS/tracking/src/Tracker.cxx

@@ -120,7 +120,7 @@ void Tracker::clustersToTracks(std::function<void(std::string s)> logger, std::f
   total += evaluateTask(&Tracker::findShortPrimaries, "Short primaries finding", logger);
 
   std::stringstream sstream;
-  if (constants::DoTimeBenchmarks) {
+  if constexpr (constants::DoTimeBenchmarks) {
     sstream << std::setw(2) << " - "
             << "Timeframe " << mTimeFrameCounter++ << " processing completed in: " << total << "ms using " << mTraits->getNThreads() << " threads.";
   }
@@ -200,7 +200,7 @@ void Tracker::clustersToTracksHybrid(std::function<void(std::string s)> logger,
   // total += evaluateTask(&Tracker::findShortPrimaries, "Hybrid short primaries finding", logger);
 
   std::stringstream sstream;
-  if (constants::DoTimeBenchmarks) {
+  if constexpr (constants::DoTimeBenchmarks) {
     sstream << std::setw(2) << " - "
             << "Timeframe " << mTimeFrameCounter++ << " processing completed in: " << total << "ms using " << mTraits->getNThreads() << " threads.";
   }

Detectors/ITSMFT/ITS/tracking/src/TrackerTraits.cxx

@@ -830,8 +830,8 @@ bool TrackerTraits::fitTrack(TrackITSExt& track, int start, int end, int step, f
     }
 
     if (mCorrType == o2::base::PropagatorF::MatCorrType::USEMatCorrNONE) {
-      float radl = 9.36f; // Radiation length of Si [cm]
-      float rho = 2.33f;  // Density of Si [g/cm^3]
+      constexpr float radl = 9.36f; // Radiation length of Si [cm]
+      constexpr float rho = 2.33f;  // Density of Si [g/cm^3]
       if (!track.correctForMaterial(mTrkParams[0].LayerxX0[iLayer], mTrkParams[0].LayerxX0[iLayer] * radl * rho, true)) {
         continue;
       }