[boost] [spirit2] How to get encoding-specific parsers by character type

Subject: [boost] [spirit2] How to get encoding-specific parsers by character type
From: Andrey Semashev (andrey.semashev_at_[hidden])
Date: 2010-06-06 13:17:32

I was wondering if it was possible to get encoding-specific parsers by 
character type? Something like that:

   template< typename CharT >
   struct encoding_specific
   {
     ...
   };

   typedef encoding_specific< char > narrow;
   narrow::char_; // equivalent to spirit::standard::char_

   typedef encoding_specific< wchar_t > wide;
   wide::char_; // equivalent to spirit::standard_wide::char_

This would help a lot in generic programming, when the character type is 
not known. Is there a tool like that already? If not, could it be added?