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()
197     length_ = static_cast<size_t>(std::distance(begin, end));  in BasicStringPiece()
201     ptr_ = length_ > 0 ? &*begin : nullptr;  in BasicStringPiece()
209   constexpr size_type size() const { return length_; }  in size()
210   constexpr size_type length() const { return length_; }  in length()
211   bool empty() const { return length_ == 0; }  in empty()
215     length_ = 0;  in clear()
219     length_ = len;  in set()
223     length_ = str ? STRING_TYPE::traits_type::length(str) : 0;  in set()
227     CHECK(i < length_);
232     CHECK_NE(0UL, length_);  in front()
237     CHECK_NE(0UL, length_);  in back()
238     return ptr_[length_ - 1];  in back()
242     CHECK(n <= length_);  in remove_prefix()
244     length_ -= n;  in remove_prefix()
248     CHECK(n <= length_);  in remove_suffix()
249     length_ -= n;  in remove_suffix()
254         ptr_, x.ptr_, (length_ < x.length_ ? length_ : x.length_));  in compare()
256       if (length_ < x.length_) r = -1;  in compare()
257       else if (length_ > x.length_) r = +1;  in compare()
271   const_iterator end() const { return ptr_ + length_; }  in end()
273     return const_reverse_iterator(ptr_ + length_);  in rbegin()
279   size_type max_size() const { return length_; }  in max_size()
280   size_type capacity() const { return length_; }  in capacity()
299         (this->length_ >= x.length_) &&  in starts_with()
300         (CharTraits<value_type>::compare(this->ptr_, x.ptr_, x.length_) == 0));  in starts_with()
305     return ((this->length_ >= x.length_) &&  in ends_with()
307                  this->ptr_ + (this->length_ - x.length_), x.ptr_, x.length_) ==  in ends_with()
375   size_type length_;  variable