Merge branch '21.0-fixDRAW_ZMUMUOnceAndForAll' into '21.0'

Ending writing of transient decorations on Muons in DRAW_ZMUMU building

See merge request atlas/athena!12501

Former-commit-id: 4e961184599a024a43522907294cb5b006c0698a

PhysicsAnalysis/PrimaryDPDMaker/PrimaryDPDMaker/DRAW_ZMUMUSkimmingTool.h

+/*
+  Copyright (C) 2002-2017 CERN for the benefit of the ATLAS collaboration
+*/
+
+///////////////////////////////////////////////////////////////////
+// DRAW_ZMUMUSkimmingTool.h, (c) ATLAS Detector software
+///////////////////////////////////////////////////////////////////
+
+#ifndef DERIVATIONFRAMEWORK_SKIMMINGTOOLEXAMPLE_H
+#define DERIVATIONFRAMEWORK_SKIMMINGTOOLEXAMPLE_H 1
+
+#include<string>
+
+// Gaudi & Athena basics
+#include "AthenaBaseComps/AthAlgTool.h"
+
+// DerivationFramework includes
+#include "DerivationFrameworkInterfaces/ISkimmingTool.h"
+
+namespace CP {
+  class IMuonSelectionTool;
+}
+
+namespace DerivationFramework {
+
+  /** @class DRAW_ZMUMUSkimmingTool
+  
+      the code used in this implementation is kindly stolen from:
+      atlasoff:: ISF/ISF_Core/ISF_Tools
+
+      @author James Catmore -at- cern.ch
+     */
+  class DRAW_ZMUMUSkimmingTool : public AthAlgTool, public ISkimmingTool {
+    
+  public: 
+    /** Constructor with parameters */
+    DRAW_ZMUMUSkimmingTool( const std::string& t, const std::string& n, const IInterface* p );
+    
+    /** Destructor */
+    ~DRAW_ZMUMUSkimmingTool();
+    
+    // Athena algtool's Hooks
+    StatusCode  initialize();
+    StatusCode  finalize();
+    
+    /** Check that the current event passes this filter */
+    virtual bool eventPassesFilter() const;
+    
+  private:
+    mutable unsigned int m_ntot;
+    mutable unsigned int m_npass;
+    std::string m_muonSGKey;
+    ToolHandle<CP::IMuonSelectionTool> m_muonSelectionTool;
+    unsigned int m_nMuons;
+    double m_muonPtCut;
+
+  }; 
+  
+}
+
+
+#endif