Re: Template question...

From:

"Victor Bazarov" <v.Abazarov@comAcast.net>

Newsgroups:

microsoft.public.vc.language

Date:

Mon, 12 Feb 2007 19:34:24 -0500

Message-ID:

<eqr12h$hd9$1@news.datemas.de>

Ben Voigt wrote:

"Victor Bazarov" <v.Abazarov@comAcast.net> wrote in message
news:epnobc$q41$1@news.datemas.de...

Andy wrote:

[..]
How would I go about making this happen?

   template<int Count> struct ACollectionOfThings {
       typedef char not_allowed[Count > 16];
       not_allowed& foo(); // dummy member
   };

   template<int Count> struct ASmallCollectionOfThings {
       typedef char not_allowed[Count <= 16];
       not_allowed& foo(); // dummy member
   };

This assumes that your compiler forbids arrays of size zero, which
isn't true of all compilers.

Why should anybody concern themselves with non-compliant compilers?

Better would be:

template<int Count> struct ACollectionOfThings {
   ~ACollectionOfThings() { // or any other member function that gets
       used const bool toosmall = Count < 16;
       switch { case toosmall: case true: break; }

How does that work? Shouldn't there be a parenthesised expression
after the 'switch'? What compiler compiles the code you posted?

}
};

   int main()
   {
       ACollectionOfThings<123> c123; // OK
       ACollectionOfThings<10> c10; // causes an error
       ASmallCollectionOfThings<10> sc10; // OK
       ASmallCollectionOfThings<123> sc123; // causes an error
       return 0;
   }

V
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