Method swap

common/value.h:472–475

  Value Clone(google::protobuf::Arena* absl_nonnull arena) const;

  friend void swap(Value& lhs, Value& rhs) noexcept {
    using std::swap;
    swap(lhs.variant_, rhs.variant_);
  }

  friend std::ostream& operator<<(std::ostream& out, const Value& value);