62     struct range  struct
64       Elem* next;
65       Elem* end;
68       range& operator=(Elem e)  in operator =()
75       Elem operator*() const { return *next; }  in operator *()
78       Elem operator[](size_t n) const { return next[n]; }  in operator []()
81       range& operator++()  in operator ++()
88       range& operator+=(size_t n)  in operator +=()
95       size_t size() const { return end - next; }  in size()
98       size_t nbytes() const { return (const char*)end - (const char*)next; }  in nbytes()
104     struct range<Elem, false>  struct
106       using value_type = typename remove_const<Elem>::type;
108       using char_pointer = typename
111       char_pointer next;
112       char_pointer end;
115       range& operator=(Elem e)  in operator =()
123       Elem operator*() const  in operator *()
131       Elem operator[](size_t n) const  in operator []()
139       range& operator++()  in operator ++()
146       range& operator+=(size_t n)  in operator +=()
153       size_t size() const { return nbytes() / sizeof(Elem); }  in size()
156       size_t nbytes() const { return end - next; }  in nbytes()