28 int StringPiece::copy(char* buf, size_type n, size_type pos) const {  in copy()
29   int ret = std::min(length_ - pos, n);  in copy()
30   memcpy(buf, ptr_ + pos, ret);  in copy()
34 StringPiece::size_type StringPiece::find(const StringPiece& s, size_type pos) const {  in find()
35   if (length_ < 0 || pos > static_cast<size_type>(length_))  in find()
38   const char* result = std::search(ptr_ + pos, ptr_ + length_,  in find()
53 StringPiece::size_type StringPiece::find(char c, size_type pos) const {  in find()
54   if (length_ <= 0 || pos >= static_cast<size_type>(length_)) {  in find()
57   const char* result = std::find(ptr_ + pos, ptr_ + length_, c);  in find()
61 StringPiece::size_type StringPiece::rfind(const StringPiece& s, size_type pos) const {  in rfind()
64   if (s.length_ == 0) return std::min(ulen, pos);  in rfind()
66   const char* last = ptr_ + std::min(ulen - s.length_, pos) + s.length_;  in rfind()
71 StringPiece::size_type StringPiece::rfind(char c, size_type pos) const {  in rfind()
73   for (int i = std::min(pos, static_cast<size_type>(length_ - 1));  in rfind()
82 StringPiece StringPiece::substr(size_type pos, size_type n) const {  in substr()  argument
83   if (pos > static_cast<size_type>(length_)) pos = length_;  in substr()
84   if (n > length_ - pos) n = length_ - pos;  in substr()
85   return StringPiece(ptr_ + pos, n);  in substr()