Re: String literal as template parameter?

mark.zaytsev@[EMAIL PROTECTED]
 ha scritto:
> On Apr 14, 12:43 pm, Sean Hunt <ride...@[EMAIL PROTECTED]
> wrote:
> 
>>> I find his extension proposal to allow a string-literal
>>> as an alternative argument of variadic non-type templates
>>> (of character type) quite interesting. This is IMO the
>>> first approach, where I would see any chance of acceptance
>>> on implementors side.
>> Yeah. This is a good idea. It doesn't take a lot of wording either:
>>
>> Sean Hunt
>>
> 
> It is also desirable to have a way to reconstruct string literal from
> variadic non-type template of character type. maybe like:
> 
> template < char ... s >
> const char* a = { s };
> 

The draft already provides a syntax for that, it is:

   template <char... s>
   class S
   {
      const char a[sizeof...(s)];
   };

   template <char... s>
   const char S<s>::a[sizeof...(s)] = { s... };

In another post of mine I proposed to leave out the final '\0' from the
char sequence. In that case we would have to add it, like this:

   template <char... s>
   class S
   {
      const char a[sizeof...(s) + 1];
   };

   template <char... s>
   const char S<s>::a[sizeof...(s) + 1] = { s..., '\0' };

not a big deal.

Ganesh

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