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  1. Newsgroups: comp.sys.next.programmer
  2. Path: sparky!uunet!haven.umd.edu!darwin.sura.net!wupost!eclnews!usenet
  3. From: flan@starling.wustl.edu (Ian Flanigan)
  4. Subject: Re: Is @selector(foo:) constant?
  5. Message-ID: <1992Aug31.193647.2603@wuecl.wustl.edu>
  6. Keywords: 3.0, selector, IB, NeXTStep, Objective-C, objc
  7. Sender: usenet@wuecl.wustl.edu (Usenet Administrator)
  8. Nntp-Posting-Host: buffalo_bill
  9. Organization: Washington University, School of Engineering, St. Louis MO
  10. References: <mdixon.714778520@thelonius>
  11. Date: Mon, 31 Aug 1992 19:36:47 GMT
  12. Lines: 76
  13.  
  14. In article <mdixon.714778520@thelonius> mdixon@parc.xerox.com (Mike  
  15. Dixon) writes:
  16. >  ** 3.0 Incompatibility Alert! **
  17. >  
  18. >  a few days ago i wrote:
  19. >  
  20. >      the trick is that although @selector(foo:) isn't constant,
  21. >      &@selector(foo:) is.  initialize your array with the addresses  
  22. of
  23. >      the selectors, and remember to dereference them before you use
  24. >      them.
  25. >  
  26. >  while this was true in 2.0, a new version of the TextORama  
  27. MiniExample
  28. >  that appeared today in the archives suggests that it's no longer  
  29. true
  30. >  in 3.0 (i'm not a beta tester, so i can't confirm it).  it appears
  31. >  that even the addresses of @selector expressions are no longer
  32. >  constant; to make this kind of code work in 3.0 you'll have to  
  33. build
  34. >  the array at runtime (with calls to sel_getUid -- see the new
  35. >  TextORama for details).
  36.  
  37. Well, I just wrote and ran a small test program.  It seems that  
  38. &@selector(foo) is still constant.  (Yeah!)  I used NS3.0 PR2, but I  
  39. suspect that it's the same across all of 'em.
  40.  
  41. If you want to try it for yourself, here's a small bit-o-program for  
  42. ya:
  43. mytest.tar.Z :  
  44.  
  45. --
  46. Ian Flanigan        "You can never have too many napkins."
  47.  
  48. Project Zeus
  49. Washington University in St. Louis
  50. flan@starling.wustl.edu
  51.  
  52.  
  53. -- NewsGrazer, a NeXTstep(tm) news reader, posting --
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