template <class charT> class numpunct_byname;
Numeric puntuation facet
standard facet has the same characteristics as the numpunct
class, except that its constructor allows the construction of an object for a specific named locale:
- constructor: explicit numpunct_byname ( const char* std_name, size_t refs = 0 );
- Constructs an object with the same characteristics as a numpunct object but adapted to a specific locale, identified by the name std_name.