Реализация istreambuf_iterator и ostreambuf_iterator

template<class Ch,class Tr=char_traits<Ch>>
    class istreambuf_iterator
        :public iterator<input_iterator_tag,Ch,typename Tr::offtype, Ch*,Ch&>
    {
    public:
        typedef Ch char_type;
        typedef Tr traits_type;
        typedef typename Tr:int_type int_type;
        typedef  basic_streambuf<Ch,Tr> streambuf_type;
        typedef  basic_istream<Ch,Tr> istream_type;
        class proxy;
        istreambuf_iterator()throw();
        istreambuf_iterator(istream_type& is)throw();
        istreambuf_iterator(streambuf_type*) throw();
        istreambuf_iterator(const proxy&p)throw();
        Ch operator*()const;
        istreambuf_iterator& operator++();
        proxy operator++(int);
        bool equal(istreambuf_iterator&);
        };
    template <class Ch, class Tr=char_traits<Ch>>
        class istreambuf_iterator<Ch, Tr>:: proxy
        {
            Ch val;
            basic_streambuf<Ch,Tr>*buf;
            proxy( Ch v, basic_streambuf<Ch,Tr>*b): val(v),buf(b){}
        public:
            Ch operator*(){return val;}
 
 
        };
        template<class Ch, class Tr= char_traits<Ch>>
        class ostreambuf_iterator: public iterator<output_iterator_tag,void,void,void,void>{
        public:
            typedef Ch char_type;
            typedef Tr traits_type;
            typedef basic_streambuf<Ch, Tr>streambuf_type;
            typedef basic_ostream< Ch,Tr>ostream_type;
            ostreambuf_iterator(ostream_type &os)throw();
            ostreambuf_iterator(streambuf_type*)throw();
            ostreambuf_iterator&operator=(Ch);
            ostreambuf_iterator&operator++();
            ostreambuf_iterator&operator++(int);
            bool failed() const throw();
        };