Input to PrintDecayTree

Change of input for PrintDecayTree: take vector of particles, which is what Hlt2 algorithms return rather than LHCb::Particles, the KeyedContainer.

This may not be needed if @apearce changes the output type of Hlt2 algorithms. Hence WIP.

Now no longer take vector.

Phys/DaVinciTools/src/PrintDecayTree.cpp

@@ -37,8 +37,7 @@ public:
   // ==========================================================================
   /// the standard execution of the algorithm
   void operator()( const LHCb::Particles& parts ) const override {
-    // get the tool
-    m_printDecay->printTree( parts.begin(), parts.end(), -1 );
+    for ( const auto* p : parts ) { m_printDecay->printTree( p, -1 ); }
     if ( !parts.empty() ) {
       m_eventCount++;
       m_candidateCount += parts.size();
@@ -51,8 +50,8 @@ private:
   /// the IPrintDecay tool itself
   ToolHandle<IPrintDecay> m_printDecay = {this, "PrintDecayTreeTool", "PrintDecayTreeTool"};
   // counters
-  mutable Gaudi::Accumulators::Counter<> m_eventCount{this, "Events"};
-  mutable Gaudi::Accumulators::Counter<> m_candidateCount{this, "Candidates"};
+  mutable Gaudi::Accumulators::Counter<>                 m_eventCount{this, "Events"};
+  mutable Gaudi::Accumulators::StatCounter<unsigned int> m_candidateCount{this, "Candidates"};
 
   // ==========================================================================
 };