Method rfind

Bcore/src/main/cpp/base/stringpiece.h:174–182

  }

  size_type rfind(const StringPiece& s, size_type pos = npos) const {
    if (length_ < s.length_) return npos;
    const size_t ulen = length_;
    if (s.length_ == 0) return std::min(ulen, pos);

    const char* last = ptr_ + std::min(ulen - s.length_, pos) + s.length_;
    const char* result = std::find_end(ptr_, last, s.ptr_, s.ptr_ + s.length_);
    return result != last ? result - ptr_ : npos;
  }

  size_type rfind(char c, size_type pos = npos) const {
    if (length_ == 0) return npos;