ITS: vertexer readability

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

Author: f3sch

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

@@ -328,7 +328,7 @@ void VertexerTraits<NLayers>::computeVertices(const int iteration)
     const auto& lines = mTimeFrame->getLines(rofId);
     auto& clusters = mTimeFrame->getTrackletClusters(rofId);
     const int numTracklets{static_cast<int>(lines.size())};
-    bounded_vector<bool> usedTracklets(numTracklets, false, mMemoryPool.get());
+    bounded_vector<uint8_t> usedTracklets(numTracklets, 0, mMemoryPool.get());
 
     for (int iLine1{0}; iLine1 < numTracklets; ++iLine1) {
       if (usedTracklets[iLine1]) {
@@ -345,26 +345,26 @@ void VertexerTraits<NLayers>::computeVertices(const int iteration)
         }
         auto dca2{Line::getDCA2(line1, line2)};
         if (dca2 < pairCut2) {
-          clusters.emplace_back(iLine1, line1, iLine2, line2);
-          if (!clusters.back().isValid() || clusters.back().getR2() > 4.f) {
+          auto& cluster = clusters.emplace_back(iLine1, line1, iLine2, line2);
+          if (!cluster.isValid() || cluster.getR2() > 4.f) {
             clusters.pop_back();
             continue;
           }
 
-          usedTracklets[iLine1] = true;
-          usedTracklets[iLine2] = true;
+          usedTracklets[iLine1] = 1;
+          usedTracklets[iLine2] = 1;
           for (int iLine3{0}; iLine3 < numTracklets; ++iLine3) {
             if (usedTracklets[iLine3]) {
               continue;
             }
             const auto& line3 = lines[iLine3];
-            if (!line3.mTime.isCompatible(clusters.back().getTimeStamp())) {
+            if (!line3.mTime.isCompatible(cluster.getTimeStamp())) {
               continue;
             }
-            const auto distance2 = Line::getDistance2FromPoint(line3, clusters.back().getVertex());
+            const auto distance2 = Line::getDistance2FromPoint(line3, cluster.getVertex());
             if (distance2 < pairCut2) {
-              clusters.back().add(iLine3, line3);
-              usedTracklets[iLine3] = true;
+              cluster.add(iLine3, line3);
+              usedTracklets[iLine3] = 1;
             }
           }
           break;