Small Locale Fixes #2, Revision 1           25 Jan 95
  ---------------------                              X3J16/94-0214R1
  by Nathan Myers,  myersn@roguewave.com              WG21/N0601R1
     Rogue Wave Software
 
  1. Extract common name definitions from class templates to base classes
 
  As in the case of ctype_base and ios_base, it is useful to users
  for constant and type names to be available from a non-parameterized
  base class.  As members of a template class their types were not
  compatible with entities of the same name but instantiated with
  different template parameters.
 
  The following new locale classes are thus recommended, in addition to
  ctype_base:
 
  struct codecvt_base { enum result { ok, partial, error }; };
  struct time_base { enum dateorder { no_order, dmy, mdy, ymd, ydm }; };
  struct money_base {
    enum part { symbol = '$', sign = '=', space = ' ', value = 'v', none = 0 };
    struct pattern { char field[4]; };
  };
  struct messages_base { typedef THE_POSIX_CATALOG_IDENTIFIER_TYPE catalog; };
 
  These are inherited by, respectively, codecvt, time_get, moneypunct,
  and messages facets.  Also: I recommend that ctype_base be simplified,
  eliminating its constructor and destructor.  All these structs are
  inherited as "mixins" by their derived classes, in addition to
  deriving directly from locale::facet.
 
  These names are all used already by locale facets, but they are
  declared within the templates, where they are relatively inaccessible
  to users.
 
  2. Change names of enumerated constants to lower case.
 
  Using upper case names exposes names to Cpp mischief; also, other
  library components define their constant names in lower case.
  I recommend changing the names as follows:
 
  ctype_base::space	ctype_base::lower	ctype_base::alnum
  ctype_base::print	ctype_base::alpha	ctype_base::graph
  ctype_base::cntrl	ctype_base::digit
  ctype_base::upper	ctype_base::xdigit
 
  codecvt_base::ok	codecvt::partial	codecvt::error
 
  time_base::no_order	time_base::dmy	time_base::mdy	
  time_base::ymd		time_base::ydm
 
  money_base::symbol	money_base::sign	money_base::space
  money_base::value	money_base::none
 
  messages_base::catalog

 
  Small Locale Fixes #2, Revision 1           25 Jan 95      page 2 of 2
  ---------------------                                94-0214R1/N0601R1
 
 
  3. Provide names for POSIX locale categories
 
  The values used to name POSIX categories, previously described as
  got from the standard header file <clocale>, represent a backward
  compatibility problem for traditional implementations.  While it
  is intended that these constants may by bitwise-or'd together to
  represent a set of categories, most C implementations define their
  LC_* constants in a way that does not permit this usage.
 
  Therefore, I recommend we provide a set of bitmask constants
  specified as such:
 
    locale::collate  locale::monetary  locale::time
    locale::ctype    locale::numeric   locale::messages
    locale::all = collate | ctype | monetary | numeric | time | messages
 
  and in addition:
 
    locale::none = 0
 
  A footnote should be added to suggest that the values assigned might
  best be chosen so as not to interfere with those used for the LC_*
  values from <clocale>, so that an implementation could accept a value
  from either source to specify a category.