NestedDefsPlugin.hh

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// $Id$
//
// Copyright (c) 2007-2026, Matteo Cacciari, Gavin P. Salam and Gregory Soyez
//
//----------------------------------------------------------------------
// This file is part of FastJet.
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#ifndef __NESTEDALGSPLUGIN_HH__
#define __NESTEDALGSPLUGIN_HH__
 
#include "fastjet/JetDefinition.hh"
#include <list>
#include <memory>
#include <cmath>
 
// questionable whether this should be in fastjet namespace or not...
FASTJET_BEGIN_NAMESPACE      // defined in fastjet/internal/base.hh
 
// another forward declaration to reduce includes
class PseudoJet;
 
//----------------------------------------------------------------------
//
/// @ingroup plugins
/// \class NestedDefsPlugin
/// Plugin to run multiple jet definitions successively (plugin for fastjet v2.4 upwards)
///
/// NestedAglsPlugin is a plugin for fastjet (v2.4 upwards) that, given
/// a list of jet definitions, performs the clustering by feeding the 
/// particles to the first algorithm and then, successively feeding the 
/// output to the next algorithm in the list.
//
class NestedDefsPlugin : public JetDefinition::Plugin {
public:
  /// Main constructor for the NestedDefs Plugin class.  
  ///
  /// The argument is an initialised list of jet algorithms
  NestedDefsPlugin (std::list<JetDefinition> &defs) :
    _defs(defs){}
 
  /// copy constructor
  NestedDefsPlugin (const NestedDefsPlugin & plugin) {
    *this = plugin;
  }
 
  // the things that are required by base class
  virtual std::string description () const;
  virtual void run_clustering(ClusterSequence &) const;
  /// the plugin mechanism's standard way of accessing the jet radius
  /// here we return the R of the last alg in the list
  virtual double R() const {return _defs.rbegin()->R();}
 
private:
  std::list<JetDefinition> _defs;
};
 
FASTJET_END_NAMESPACE        // defined in fastjet/internal/base.hh
 
#endif // __SISCONEPLUGIN_HH__