Function IsHexDigit

src/butil/strings/string_util.h:377–381

template <typename Char>
inline bool IsHexDigit(Char c) {
  return (c >= '0' && c <= '9') ||
         (c >= 'A' && c <= 'F') ||
         (c >= 'a' && c <= 'f');
}

template <typename Char>
inline Char HexDigitToInt(Char c) {