feat: Add getters to Histo

doc/releases/changelog-dev.md

@@ -2,10 +2,14 @@
 
 ## New features since last release
 
+- In expert mode, all `Histo` protected properties like `nbins_` now have getters, e.g. `Manager()->GetPlotManager()->GetHistos()[0]->Nbins()` ([#251](https://github.com/MadAnalysis/madanalysis5/pull/251)).
+
 ## Improvements
 
 ## Bug fixes
 
 ## Contributors
 
 This release contains contributions from (in alphabetical order):
+
+[Bastien Voirin](https://github.com/bastienvoirin)

tools/SampleAnalyzer/Process/Plot/Histo.h

@@ -204,6 +204,32 @@ class Histo : public PlotBase
     }
   }
 
+  /// Histogram arrays
+  std::vector< std::pair<MAfloat64,MAfloat64> > Histo() { return histo_; }
+  std::pair<MAfloat64, MAfloat64> Underflow() { return underflow_; }
+  std::pair<MAfloat64, MAfloat64> Overflow() { return overflow_; }
+
+  /// Histogram description
+  MAuint32  Nbins() { return nbins_; }
+  MAfloat64 Xmin() { return xmin_; }
+  MAfloat64 Xmax() { return xmax_; }
+  MAfloat64 Step() { return step_; }
+
+  /// Sum of event-weights over entries
+  std::pair<MAfloat64,MAfloat64> SumW() { return sum_w_; }
+
+  /// Sum of squared weights
+  std::pair<MAfloat64,MAfloat64> SumWW() { return sum_ww_; }
+
+  /// Sum of value * weight
+  std::pair<MAfloat64,MAfloat64> SumXW() { return sum_xw_; }
+
+  /// Sum of value * value * weight
+  std::pair<MAfloat64,MAfloat64> SumXXW() { return sum_xxw_; }
+
+  /// RegionSelections attached to the histo
+  std::vector<RegionSelection*> Regions() { return regions_; }
+
   /// Write the plot in a ROOT file
   virtual void Write_TextFormat(std::ostream* output);