Article View: comp.std.c++
Article #1099Re: Recursive templates
From: Paul Jay Lucas
Date: Tue, 17 Nov 1992 00:18
Date: Tue, 17 Nov 1992 00:18
33 lines
1372 bytes
1372 bytes
In <1992Nov16.220526.21566@borland.com> pete@borland.com (Pete Becker) writes:
>In article <83733@ut-emx.uucp> jamshid@emx.cc.utexas.edu (Jamshid Afshar) writes:
>>Has ANSI decided anything about the expansion of a recursive template
>>definition?
> template <unsigned n> class Factorial
> {
> public:
> unsigned eval() { return n*Factorial<n-1>.eval(); }
> };
> class Factorial<0>
> {
> public:
> unsigned eval() { return 1; }
> };
> #include <iostream.h>
> int main()
> {
> Factorial<6> f6;
> cout << f6.eval() << endl;
> return 0;
> }
*****> Has anyone got a *real* justification for this? This is a very
obfuscated way of writing factorial.
--
- Paul J. Lucas University of Illinois
AT&T Bell Laboratories at Urbana-Champaign
Naperville, IL pjl@cs.uiuc.edu
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Newsgroups: comp.std.c++ Path: arc1-ca.pugleaf.net!sparky!uunet!charon.amdahl.com!pacbell.com!ames!saimiri.primate.wisc.edu!zaphod.mps.ohio-state.edu!uwm.edu!ux1.cso.uiuc.edu!news.cso.uiuc.edu!meibm31.cen.uiuc.edu!pl2440 From: pl2440@meibm31.cen.uiuc.edu (Paul Jay Lucas) Subject: Re: Recursive templates References: <83733@ut-emx.uucp> <1992Nov16.220526.21566@borland.com> Message-ID: <Bxu3J4.F93@news.cso.uiuc.edu> Sender: usenet@news.cso.uiuc.edu (Net Noise owner) Organization: University of Illinois at Urbana Date: Tue, 17 Nov 1992 00:18:39 GMT Lines: 33