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/usr/include/CLHEP/RefCount/ZMuseCount.icc is in libclhep-dev 2.1.4.1-1.2.

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// ----------------------------------------------------------------------
//
//  ZMuseCount.icc - utility class for use in reference-counting
//
//
//  History:
//    19-Sep-1997  WEB  Design stolen, and code adapted, from pp 70-73 of
//      Koenig & Moo: "Ruminations on C++" (1996)
//    23-Sep-1997  WEB  Furnished overlooked body of copy constructor.
//
// ----------------------------------------------------------------------


ZMuseCount::ZMuseCount()
: p( new int(1) )
{
  // DEBUG if ( p == 0 )
  // DEBUG   std::cerr << "ZMuseCount memory allocation failure!" << std::endl;
}


ZMuseCount::ZMuseCount( const ZMuseCount & u )
: p( u.p )
{
  ++*p;
}


ZMuseCount::~ZMuseCount()  {
  if ( --*p == 0 )
    delete p;
}


bool ZMuseCount::only()  { 
  return *p == 1;
}