diff --git a/Handlers/Hint.h b/Handlers/Hint.h
--- a/Handlers/Hint.h
+++ b/Handlers/Hint.h
@@ -1,204 +1,204 @@
 // -*- C++ -*-
 //
 // Hint.h is a part of ThePEG - Toolkit for HEP Event Generation
 // Copyright (C) 1999-2017 Leif Lonnblad
 //
 // ThePEG is licenced under version 3 of the GPL, see COPYING for details.
 // Please respect the MCnet academic guidelines, see GUIDELINES for details.
 //
 #ifndef ThePEG_Hint_H
 #define ThePEG_Hint_H
 // This is the declaration of the Hint class.
 
 #include "ThePEG/Config/ThePEG.h"
 #include "ThePEG/Utilities/ClassDescription.h"
 
 namespace ThePEG {
 
 /**
  * Hint is a base class to be used to pass information
  * between <code>StepHandler</code> s, which cannot be convayed
  * through the Event record. The base class contains a vector of of
  * tagged particles. A StepHandler is always given a hint, and is only
  * allowed to treat Particles from the current Step which are listed
  * in the vector of tagged particles in the hint (if this vector is
  * empty the StepHandler may treat all particles in the Step.
  *
  * A Hint may have the stop flag set. In this case
  * the StepHandler to which the hint is assigned is
  * not called, and the event generation is stopped.
  *
  * A Hint may be given a scale, but what a StepHandler does with this
  * and other pieces of information possibly supplied by subclasses of
  * Hint, is not defined.
  *
  * There is a special Hint which is kept as the static member called
  * Hint::theDefaultHint. Although any default constructed Hint object
  * would work as a default hint, only pointers to this static object
  * should be used where a default hint is needed.
  *
  *
  * @see StepHandler
  * @see EventHandler
  * @see Particle
  * @see Event
  * @see Step
  * 
  */
 class Hint: public Base {
 
 public:
 
   /** @name Standard constructors and destructors. */
   //@{
   /**
    * Default constructor.
    */
   Hint() : theScale(Energy2()), theStopFlag(false) {}
   //@}
 
 public:
 
   /**
    * Return true if there are tagged particles in the hint.
    */
   bool tagged() const { return !theTagged.empty(); }
 
   /**
    * Return a list of pointers to particles to be handled. A handler
    * is not allowed to touch other particles in the event record. If a
    * particle which has been flagged by the hint is no longer present
    * in the current Step, a null pointer is inserted in its place.
    */
   tPVector tagged(const Step & s) const;
 
   /**
    * Add a range of particles to the list of tagged particles.
    */
   template <typename InputIterator>
   void tag(InputIterator first, InputIterator last) 
   { 
     theTagged.insert(theTagged.end(), first, last); 
   }
 
   /**
    * Add a particle to the list of tagged particles.
    */
   void tag(tPPtr p) { if (p) theTagged.push_back(p); }
 
   /**
    * Set the stop hint.
    */
   void stop(bool newStopFlag) 
   {
     theStopFlag = newStopFlag;
     if ( theStopFlag ) theTagged.clear(); 
   }
 
   /**
    * Get the stop hint.
    */
   bool stop() const { return theStopFlag; }
 
   /**
    * Set the scale.
    */
   void scale(const Scale & newScale) { theScale = newScale; }
   /**
    * Get the scale.
    */
   const Scale & scale() const { return theScale; }
 
   /**
    * Return a pointer to the default hint.
    */
   static tHintPtr Default() { return tHintPtr(&theDefaultHint); }
 
 public:
 
   /** @name Functions used by the persistent I/O system. */
   //@{
   /**
    * Function used to write out object persistently.
    * @param os the persistent output stream written to.
    */
   void persistentOutput(PersistentOStream & os) const;
 
   /**
    * Function used to read in object persistently.
    * @param is the persistent input stream read from.
    * @param version the version number of the object when written.
    */
   void persistentInput(PersistentIStream & is, int version);
   //@}
 
   /**
    * Standard Init function used to initialize the interface.
    */
   static void Init();
 
 private:
 
   /**
    * The vector of tagged particles.
    */
   tPVector theTagged;
 
   /**
    * The scale.
    */
   Scale theScale;
 
   /**
    * The stop hint.
    */
   bool theStopFlag;
 
   /**
    * The default hint.
    */
   static Hint theDefaultHint;
 
 private:
 
   /**
    * Describe a concrete class with persistent data.
    */
   static ClassDescription<Hint> initHint;
 
   /**
    * Assignment is private and non-existing.
    */
-  Hint & operator=(const Hint & h);
+  Hint & operator=(const Hint & h) = delete;
 
 };
 
 
 /** @cond TRAITSPECIALIZATIONS */
 
 /**
  * This template specialization informs ThePEG about the
  * base class of Hint.
  */
 template <>
 struct BaseClassTrait<Hint,1>: public ClassTraitsType {
   /** Typedef of the base class of Hint. */
   typedef Base NthBase;
 };
 
 /**
  * This template specialization informs ThePEG about the name of the
  * Hint class.
  */
 template <>
 struct ClassTraits<Hint>:
     public ClassTraitsBase<Hint> {
   /** Return the class name. */
   static string className() { return "ThePEG::Hint"; }
 };
 
 /** @endcond */
 
 }
 
 #endif /* ThePEG_Hint_H */