/usr/include/tulip/SizeProperty.h is in libtulip-dev 3.1.2-2.3ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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/**
 Authors: David Auber, Patrick Mary, Morgan Mathiaut
 from the LaBRI Visualization Team
 Email : auber@tulip-software.org
 Last modification : 13/03/2009 
 This program 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.
*/
#ifndef TULIP_SIZES_H
#define TULIP_SIZES_H
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "tulip/AbstractProperty.h"
#include "tulip/TemplateFactory.h"
#include "tulip/SizeAlgorithm.h"
namespace tlp {
class PropertyContext;
/**
 * \addtogroup properties
 */ 
/*@{*/
  class TLP_SCOPE SizeProperty:public AbstractProperty<SizeType,SizeType, SizeAlgorithm>,
  public PropertyObserver { 
  friend class SizeAlgorithm;
public :
  SizeProperty (Graph *);
  Size getMax(Graph *sg=0);
  Size getMin(Graph *sg=0);
  PropertyInterface* clonePrototype(Graph *, std::string );
  void copy( const node, const node, PropertyInterface * );
  void copy( const edge, const edge, PropertyInterface * );
  void scale( const tlp::Vector<float,3>&, Graph *sg=0 );
  void scale( const tlp::Vector<float,3>&, Iterator<node> *, Iterator<edge> *);
  // redefinition of some PropertyObserver methods 
  virtual void beforeSetNodeValue(PropertyInterface* prop, const node n);
  virtual void beforeSetEdgeValue(PropertyInterface* prop, const edge e);
  virtual void beforeSetAllNodeValue(PropertyInterface* prop);
  virtual void beforeSetAllEdgeValue(PropertyInterface* prop);
protected:
  void resetMinMax();
private:
  stdext::hash_map<unsigned long, Size> max,min;
  stdext::hash_map<unsigned long, bool> minMaxOk;
  void computeMinMax(Graph * sg=NULL);
};
/*@}*/
}
#endif
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