41   const char*   ptr_;
48   StringPiece() : ptr_(NULL), length_(0) { }  in StringPiece()
50     : ptr_(str), length_((str == NULL) ? 0 : static_cast<int>(strlen(str))) { }  in StringPiece()
52     : ptr_(str.data()), length_(static_cast<int>(str.size())) { }  in StringPiece()
53   StringPiece(const char* offset, int len) : ptr_(offset), length_(len) { }  in StringPiece()
59   const char* data() const { return ptr_; }  in data()
65     ptr_ = NULL;  in clear()
69     ptr_ = data;  in set()
73     ptr_ = str;  in set()
80     ptr_ = reinterpret_cast<const char*>(data);  in set()
84   char operator[](int i) const { return ptr_[i]; }
87     ptr_ += n;  in remove_prefix()
115             (memcmp(ptr_, x.ptr_, x.length_) == 0));  in starts_with()
121             (memcmp(ptr_ + (length_-x.length_), x.ptr_, x.length_) == 0));  in ends_with()
136   iterator begin() const { return ptr_; }  in begin()
137   iterator end() const { return ptr_ + length_; }  in end()
139     return const_reverse_iterator(ptr_ + length_);  in rbegin()
142     return const_reverse_iterator(ptr_);  in rend()