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  1. From: austern@isolde.mti.sgi.com (Matt Austern)
  2. Message-ID: <AUSTERN.96Apr18160013@isolde.mti.sgi.com>
  3. X-Original-Date: 18 Apr 1996 23:00:13 GMT
  4. Path: in1.uu.net!bounce-back
  5. Date: 19 Apr 96 14:49:33 GMT
  6. Approved: fjh@cs.mu.oz.au
  7. Newsgroups: comp.std.c++
  8. Subject: Re: Template argument deduction
  9. Organization: SGI
  10. References: <FREYBURG.96Apr15144107@glitch.stanford.edu> <xsoratnorr5.fsf@avs.cs.rpi.edu>
  11.     <FREYBURG.96Apr18141053@wavelet.stanford.edu>
  12. Reply-To: austern@mti.mti.sgi.com
  13. In-Reply-To: freyburg@wavelet.stanford.edu's message of 18 Apr 1996 21:14:46 GMT
  14. X-Auth: PGPMoose V1.1 PGP comp.std.c++
  15.     iQBFAgUBMXeoCOEDnX0m9pzZAQHAPAF+NoVTu7+hu+JJjKWkmC3fYVPAawvuaQD4
  16.     RMehIjS/uBhE8Ze9/pXVe0tXn6b8E+cO
  17.     =bqAV
  18.  
  19. In article <FREYBURG.96Apr18141053@wavelet.stanford.edu>
  20. freyburg@wavelet.stanford.edu (Brian Michael Freyburger) writes:
  21.  
  22. > > It's a non-issue since default template arguments cannot be
  23. > > specified for function templates.
  24. > > 
  25. > >     Daveed
  26. > 
  27. > Where in the working papers does it say this?  They appear to me to be
  28. > introduced in 14.8 [temp.arg], which as far as I can tell applies to
  29. > both functions and classes.  I see nothing in 14.10 [temp.fct] which
  30. > disallows them--what did I miss?
  31.  
  32. That's right: there's nothing in the WP that disallows default
  33. template arguments for functions; there's also nothing there, though,
  34. that says what their semantics would be if they were allowed.  
  35.  
  36. The committee had to choose between defining the semantics of default
  37. template arguments for functions, or simply disallowing them; it chose
  38. the latter.  This decision was made at the Santa Cruz meeting, so it
  39. isn't yet reflected in a new version of the WP.
  40.  
  41. I don't think there would have been any technical problems with
  42. allowing default template arguments for function templates; it's just
  43. that it would have required a fair amount of work to come up with a
  44. clear set of rules.  (I can think of at least three or four issues
  45. that would have had to be resolved, which probably means that there
  46. are another dozen that I haven't thought of.)  The general feeling was
  47. that the feature wouldn't have been important enough to be worth that
  48. much effort.
  49. -- 
  50. Matt Austern
  51. SGI: MTI Compilers Group
  52. austern@isolde.mti.sgi.com
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