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Article #1099

Re: Recursive templates

#1099
From: Paul Jay Lucas
Date: Tue, 17 Nov 1992 00:18
33 lines
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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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>
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Organization: University of Illinois at Urbana
Date: Tue, 17 Nov 1992 00:18:39 GMT
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