50   StringPiece() : ptr_(nullptr), length_(0) { }  in StringPiece()
52     : ptr_(str), length_((str == nullptr) ? 0 : strlen(str)) { }  in StringPiece()
54     : ptr_(str.data()), length_(str.size()) { }  in StringPiece()
55   StringPiece(const char* offset, size_t len) : ptr_(offset), length_(len) { }  in StringPiece()
62   size_type size() const { return length_; }  in size()
63   size_type length() const { return length_; }  in length()
64   bool empty() const { return length_ == 0; }  in empty()
68     length_ = 0;  in clear()
72     length_ = len;  in set()
77       length_ = strlen(str);  in set()
79       length_ = 0;  in set()
84     length_ = len;  in set()
97     length_ -= n;  in remove_prefix()
101     length_ -= n;  in remove_suffix()
123     return ((length_ >= x.length_) &&  in starts_with()
124             (memcmp(ptr_, x.ptr_, x.length_) == 0));  in starts_with()
129     return ((length_ >= x.length_) &&  in ends_with()
130             (memcmp(ptr_ + (length_-x.length_), x.ptr_, x.length_) == 0));  in ends_with()
134   iterator end() const { return ptr_ + length_; }  in end()
136     return const_reverse_iterator(ptr_ + length_);  in rbegin()
155   size_type   length_;  variable