/usr/include/fastjet/NestedDefsPlugin.hh is in libfastjetplugins-dev 3.0.6+dfsg-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// $Id: NestedDefsPlugin.hh 2577 2011-09-13 15:11:38Z salam $
//
// Copyright (c) 2007-2011, Matteo Cacciari, Gavin P. Salam and Gregory Soyez
//
//----------------------------------------------------------------------
// This file is part of FastJet.
//
// FastJet is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// The algorithms that underlie FastJet have required considerable
// development and are described in hep-ph/0512210. If you use
// FastJet as part of work towards a scientific publication, please
// include a citation to the FastJet paper.
//
// FastJet is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with FastJet. If not, see <http://www.gnu.org/licenses/>.
//----------------------------------------------------------------------
//ENDHEADER
#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__
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