#ifndef PHONEH
#define PHONEH
#include <iostream>
#include <sstream>   //for basic_string and basic_ostringstream
#include <locale>
using namespace std;

class phone {                        //a telephone number
	unsigned long n;
public:
	phone(unsigned long initial_n): n(initial_n) {}
	operator unsigned long() const {return n;}
};

template <class CHAR, class IT = ostreambuf_iterator<CHAR> >
class phone_put: public locale::facet {
public:
	static locale::id id;             //declaration
	explicit phone_put(size_t r = 0): locale::facet(r) {}

	virtual basic_string<CHAR> to_str(const phone& p) const {
		basic_ostringstream<CHAR> ost;
		ost << static_cast<unsigned long>(p);   //cast calls line 12
		return ost.str();
	}
};

template <class CHAR, class IT>
locale::id phone_put<CHAR, IT>::id;   //definition of static data member

template <class CHAR>
basic_ostream<CHAR>&
operator<<(basic_ostream<CHAR>& ost, const phone& p)
{
	const locale& loc = ost.getloc();
	if (has_facet<phone_put<CHAR> >(loc)) {
		ost << use_facet<phone_put<CHAR> >(loc).to_str(p);
	} else {
		ost << static_cast<unsigned long>(p);   //cast calls line 12
	}
	return ost;
}
#endif