Add a new functor that stores the MC_ORIGINFLAG (i.e. a flavour tag type)

Add MC_ORIGINFLAG using MCTaggingHelperTool

Should go together with DaVinci!1000 (merged) and Analysis!1043 (merged)

Phys/DaVinciInterfaces/include/Kernel/IMCTaggingHelperTool.h

+/*****************************************************************************\
+* (c) Copyright 2000-2018 CERN for the benefit of the LHCb Collaboration      *
+*                                                                             *
+* This software is distributed under the terms of the GNU General Public      *
+* Licence version 3 (GPL Version 3), copied verbatim in the file "COPYING".   *
+*                                                                             *
+* In applying this licence, CERN does not waive the privileges and immunities *
+* granted to it by virtue of its status as an Intergovernmental Organization  *
+* or submit itself to any jurisdiction.                                       *
+\*****************************************************************************/
+#pragma once
+
+#include "GaudiKernel/IAlgTool.h"
+
+// from LHCb
+#include "Event/MCParticle.h"
+
+enum originTagCodes {
+  SignalB_Decay        = 0,
+  SS_Fragmentation        = 1,
+  OS_B_Decay        = 2,
+  OS_ExcitedB_Decay     = 3,
+  OS_b_Fragmentation       = 4,
+  Prompt_From_SignalB_PV          = 5,
+  Other_From_SignalB_PV            = 6,
+  Not_From_SignalB_PV = 100
+};
+
+struct GAUDI_API IMCTaggingHelperTool : extend_interfaces<IAlgTool> {
+
+  DeclareInterfaceID( IMCTaggingHelperTool, 3, 0 );
+
+  virtual originTagCodes originType( const LHCb::MCParticle& bMC, const LHCb::MCParticle& bAnMC,
+                                     const LHCb::MCParticle& tMC ) const                              = 0;
+  virtual originTagCodes originType( const LHCb::MCParticle& bMC, const LHCb::MCParticle& tMC ) const = 0;
+};