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Text File  |  1996-08-06  |  1.4 KB  |  42 lines
  1. Newsgroups: comp.std.c++
  2. Path: cs.mu.OZ.AU!bounce-back
  3. From: John Max Skaller <maxtal@suphys.physics.su.oz.au>
  4. Subject: typeinfo
  5. Message-ID: <310B7660.4116@suphys.physics.su.oz.au>
  6. Originator: fjh@munta.cs.mu.OZ.AU
  7. Sender: news@cs.mu.OZ.AU (CS-Usenet)
  8. Organization: MAXTAL
  9. X-Original-Date: Sun, 28 Jan 1996 23: 13:04 +1000
  10. Date: Mon, 29 Jan 1996 00:05:04 GMT
  11. Approved: fjh@cs.mu.oz.au
  12. X-Auth: PGPMoose V1.1 PGP comp.std.c++
  13.     iQBFAgUBMQwPbeEDnX0m9pzZAQFDJAGAhWeXSz6cXyPrIVvgAsGdVOKvrSCE6VWY
  14.     Hwh+tIkeg9nycMDBwTyS8nK2OvKdgZVb
  15.     =7XmX
  16. X-Mailer: Mozilla 2.0b6a (WinNT; I)
  17.  
  18. > class beatha{public:virtual ~beatha(){};}
  19. > class duine:public beatha{};
  20. > class gael: public duine {};
  21. > 
  22. > beatha *pd=new gael;
  23. > if(typeid(pd)==typeid(duine)
  24. > {       cout<<"duine";
  25. > }
  26. > ...
  27. > does "duine" get printed here or not?
  28.  
  29. No. pd denotes an object of exact type "gael".
  30. This is not the same type as "duine".
  31. [Note "beatha" is polymorphic]
  32.  
  33. -- 
  34. John Max Skaller               voice: 61-2-566-2189
  35. 81 Glebe Point Rd              fax:   61-2-660-0850
  36. GLEBE NSW 2037                 web: http://www.maxtal.com.au/~skaller/
  37. AUSTRALIA                      email: skaller@maxtal.com.au
  38. ---
  39. [ comp.std.c++ is moderated.  Submission address: std-c++@ncar.ucar.edu.
  40.   Contact address: std-c++-request@ncar.ucar.edu.  The moderation policy
  41.   is summarized in http://dogbert.lbl.gov/~matt/std-c++/policy.html. ]
  42.