template <class Facet> locale combine(const locale& other) const;
Effects: Constructs a locale incorporating all facets from *this except for that one facet of other that is identified by Facet.
Returns: The newly created locale.
Throws: runtime_error if has_facet<Facet>(other) is false.
Remarks: The resulting locale has no name.
basic_string<char> name() const;