26   const char *First;  variable
33   StringView(const char (&Str)[N]) : First(Str), Last(Str + N - 1) {}  in StringView()
35       : First(First_), Last(Last_) {}  in StringView()
37       : First(First_), Last(First_ + Len) {}  in StringView()
38   StringView(const char *Str) : First(Str), Last(Str + std::strlen(Str)) {}  in StringView()
39   StringView() : First(nullptr), Last(nullptr) {}  in StringView()
52       if (const void *P = ::memchr(First + From, C, size() - From))
53         return size_t(static_cast<const char *>(P) - First);
61     return StringView(First + N, Last);
67     return StringView(First, Last - N);
82     return *First++;  in popFront()
109   const char *begin() const { return First; }  in begin()
111   size_t size() const { return static_cast<size_t>(Last - First); }  in size()
112   bool empty() const { return First == Last; }  in empty()