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File indexing completed on 2025-01-18 09:54:39

0001 // ----------------------------------------------------------------------
0002 //
0003 //  ZMuseCount.icc - utility class for use in reference-counting
0004 //
0005 //
0006 //  History:
0007 //    19-Sep-1997  WEB  Design stolen, and code adapted, from pp 70-73 of
0008 //      Koenig & Moo: "Ruminations on C++" (1996)
0009 //    23-Sep-1997  WEB  Furnished overlooked body of copy constructor.
0010 //
0011 // ----------------------------------------------------------------------
0012 
0013 
0014 ZMuseCount::ZMuseCount()
0015 : p( new int(1) )
0016 {
0017   // DEBUG if ( p == 0 )
0018   // DEBUG   std::cerr << "ZMuseCount memory allocation failure!" << std::endl;
0019 }
0020 
0021 
0022 ZMuseCount::ZMuseCount( const ZMuseCount & u )
0023 : p( u.p )
0024 {
0025   ++*p;
0026 }
0027 
0028 
0029 ZMuseCount::~ZMuseCount()  {
0030   if ( --*p == 0 )
0031     delete p;
0032 }
0033 
0034 
0035 bool ZMuseCount::only()  { 
0036   return *p == 1;
0037 }