179   constexpr BasicStringPiece() : ptr_(NULL), length_(0) {}  in BasicStringPiece()
185       : ptr_(str), length_(!str ? 0 : CharTraits<value_type>::length(str)) {}  in BasicStringPiece()
187       : ptr_(str.data()), length_(str.size()) {}  in BasicStringPiece()
189       : ptr_(offset), length_(len) {}  in BasicStringPiece()
201     ptr_ = length_ > 0 ? &*begin : nullptr;  in BasicStringPiece()
208   constexpr const value_type* data() const { return ptr_; }  in data()
214     ptr_ = NULL;  in clear()
218     ptr_ = data;  in set()
222     ptr_ = str;  in set()
228     return ptr_[i];
233     return ptr_[0];  in front()
238     return ptr_[length_ - 1];  in back()
243     ptr_ += n;  in remove_prefix()
254         ptr_, x.ptr_, (length_ < x.length_ ? length_ : x.length_));  in compare()
270   const_iterator begin() const { return ptr_; }  in begin()
271   const_iterator end() const { return ptr_ + length_; }  in end()
273     return const_reverse_iterator(ptr_ + length_);  in rbegin()
276     return const_reverse_iterator(ptr_);  in rend()
300         (CharTraits<value_type>::compare(this->ptr_, x.ptr_, x.length_) == 0));  in starts_with()
307                  this->ptr_ + (this->length_ - x.length_), x.ptr_, x.length_) ==  in ends_with()
374   const value_type* ptr_;