158   std::string result;  // RVO/NRVO/move  in ToString()  local
160     result.reserve(2 * size_);  in ToString()
163       result.push_back(toHex(c >> 4));  in ToString()
164       result.push_back(toHex(c & 0xf));  in ToString()
166     return result;  in ToString()
168     result.assign(data_, size_);  in ToString()
169     return result;  in ToString()
174 bool Slice::DecodeHex(std::string* result) const {  in DecodeHex()
180   if (!result) {  in DecodeHex()
183   result->clear();  in DecodeHex()
184   result->reserve(len / 2);  in DecodeHex()
195     result->push_back(static_cast<char>((h1 << 4) | h2));  in DecodeHex()