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/usr/include/CLHEP/RefCount/ZMhandleTo.icc is in libclhep-dev 2.1.4.1-1.1.

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// ----------------------------------------------------------------------
//
// ZMhandleTo.icc - generic handle class for objects that need to be
//   reference-counted
//
// History:
//   19-Sep-1997  WEB  Design stolen, and code adapted, from
//     Stroustrup: "The C++ Programming Language, 3rd ed" (1997), p 783
//     Koenig & Moo: "Ruminations on C++" (1996), ch 7
//   22-Sep-1997  WEB  Updated to require (& use) clone() operator
//     for reference-counted objects; this is to insure against a user's
//     destroying the object while one or more handles are still pointing
//     to it
//
// ----------------------------------------------------------------------


template< class T>
inline ZMhandleTo<T>::ZMhandleTo()
: u_()
, rep_( new T )
{ ; }


template< class T>
inline ZMhandleTo<T>::ZMhandleTo( const ZMhandleTo<T> & h )
: u_  ( h.u_   )
, rep_( h.rep_ )
{ ; }  // copy constructor, share the representation


template< class T>
inline ZMhandleTo<T>::~ZMhandleTo()  {
  if ( u_.only() )
    delete rep_;
}  // destructor


template< class T>
inline ZMhandleTo<T> & ZMhandleTo<T>::operator=( const ZMhandleTo<T> & rhs )  {
  if ( u_.reattach( rhs.u_) )
    delete rep_;
  rep_ = rhs.rep_;

  return *this;
}  // operator=()


template< class T>
inline ZMhandleTo<T>::ZMhandleTo( const T & t )
: rep_( t.clone() )
{ ; }


template< class T>
inline ZMhandleTo<T>::ZMhandleTo( const T * t )
: rep_( t->clone() )
{ ; }