177   constexpr string_view() noexcept : ptr_(nullptr), length_(0) {}  in string_view()
184           str) noexcept  in string_view()
210   constexpr const_iterator begin() const noexcept { return ptr_; }  in begin()
217   constexpr const_iterator end() const noexcept { return ptr_ + length_; }  in end()
223   constexpr const_iterator cbegin() const noexcept { return begin(); }  in cbegin()
230   constexpr const_iterator cend() const noexcept { return end(); }  in cend()
236   const_reverse_iterator rbegin() const noexcept {  in rbegin()
245   const_reverse_iterator rend() const noexcept {  in rend()
253   const_reverse_iterator crbegin() const noexcept { return rbegin(); }  in crbegin()
260   const_reverse_iterator crend() const noexcept { return rend(); }  in crend()
267   constexpr size_type size() const noexcept {  in size()
274   constexpr size_type length() const noexcept { return size(); }  in length()
279   constexpr size_type max_size() const noexcept { return kMaxSize; }  in max_size()
284   constexpr bool empty() const noexcept { return length_ == 0; }  in empty()
328   constexpr const_pointer data() const noexcept { return ptr_; }  in data()
354   void swap(string_view& s) noexcept {  in swap()
407   constexpr int compare(string_view x) const noexcept {  in compare()
452   size_type find(string_view s, size_type pos = 0) const noexcept;
456   size_type find(char c, size_type pos = 0) const noexcept;
464       noexcept;
468   size_type rfind(char c, size_type pos = npos) const noexcept;
476       noexcept;
481       noexcept {
491       noexcept;
496       noexcept {
505   size_type find_first_not_of(string_view s, size_type pos = 0) const noexcept;
509   size_type find_first_not_of(char c, size_type pos = 0) const noexcept;
517                                           size_type pos = npos) const noexcept;
522       noexcept;
568 constexpr bool operator==(string_view x, string_view y) noexcept {
574 constexpr bool operator!=(string_view x, string_view y) noexcept {
578 constexpr bool operator<(string_view x, string_view y) noexcept {
582 constexpr bool operator>(string_view x, string_view y) noexcept {
586 constexpr bool operator<=(string_view x, string_view y) noexcept {
590 constexpr bool operator>=(string_view x, string_view y) noexcept {