ITS: add getter to query how many pvs are in mutliple rofs

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

Author: f3sch

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

@@ -75,7 +75,7 @@ struct TimeFrame {
   gsl::span<const std::pair<MCCompLabel, float>> getPrimaryVerticesMCRecInfo(const int rofId) const;
   gsl::span<const std::array<float, 2>> getPrimaryVerticesXAlpha(int rofId) const;
   void fillPrimaryVerticesXandAlpha();
-  int getPrimaryVerticesNum(int rofId = -1) const;
+  int getPrimaryVerticesNum(int rofId = -1, int drofs = 1) const;
   void addPrimaryVertices(const bounded_vector<Vertex>& vertices);
   void addPrimaryVerticesLabels(bounded_vector<std::pair<MCCompLabel, float>>& labels);
   void addPrimaryVertices(const bounded_vector<Vertex>& vertices, const int rofId, const int iteration);
@@ -389,9 +389,9 @@ inline gsl::span<const std::array<float, 2>> TimeFrame<nLayers>::getPrimaryVerti
 }
 
 template <int nLayers>
-inline int TimeFrame<nLayers>::getPrimaryVerticesNum(int rofId) const
+inline int TimeFrame<nLayers>::getPrimaryVerticesNum(int rofId, int drofs) const
 {
-  return rofId < 0 ? mPrimaryVertices.size() : mROFramesPV[rofId + 1] - mROFramesPV[rofId];
+  return rofId < 0 ? mPrimaryVertices.size() : mROFramesPV[rofId + drofs] - mROFramesPV[rofId];
 }
 
 template <int nLayers>