ros msg serialize and deserialize for type double

edit

Hi

I have done a custom message for a type uint64_t but how I do this for type double?

Here my code:

class EkfParameters : public ros::Msg
  {
    public:
      typedef uint64_t _residual_type;
      _residual_type residual;

    EkfParameters():
      residual(0)
    {
    }

    virtual int serialize(unsigned char *outbuffer) const
    {
      int offset = 0;
      *(outbuffer + offset + 0) = (this->residual >> (8 * 0)) & 0xFF;
      *(outbuffer + offset + 1) = (this->residual >> (8 * 1)) & 0xFF;
      *(outbuffer + offset + 2) = (this->residual >> (8 * 2)) & 0xFF;
      *(outbuffer + offset + 3) = (this->residual >> (8 * 3)) & 0xFF;
      *(outbuffer + offset + 4) = (this->residual >> (8 * 4)) & 0xFF;
      *(outbuffer + offset + 5) = (this->residual >> (8 * 5)) & 0xFF;
      *(outbuffer + offset + 6) = (this->residual >> (8 * 6)) & 0xFF;
      *(outbuffer + offset + 7) = (this->residual >> (8 * 7)) & 0xFF;
      offset += sizeof(this->residual);
      return offset;
    }

    virtual int deserialize(unsigned char *inbuffer)
    {
      int offset = 0;
      this->residual =  ((uint64_t) (*(inbuffer + offset)));
      this->residual |= ((uint64_t) (*(inbuffer + offset + 1))) << (8 * 1);
      this->residual |= ((uint64_t) (*(inbuffer + offset + 2))) << (8 * 2);
      this->residual |= ((uint64_t) (*(inbuffer + offset + 3))) << (8 * 3);
      this->residual |= ((uint64_t) (*(inbuffer + offset + 4))) << (8 * 4);
      this->residual |= ((uint64_t) (*(inbuffer + offset + 5))) << (8 * 5);
      this->residual |= ((uint64_t) (*(inbuffer + offset + 6))) << (8 * 6);
      this->residual |= ((uint64_t) (*(inbuffer + offset + 7))) << (8 * 7);
      offset += sizeof(this->residual);
     return offset;
    }

    const char * getType(){ return "arduino_vi_sync/EkfParameters"; };
    const char * getMD5(){ return "429a0337b7125479e9bf5f4056e69192"; };

  };

But how I do this for a type double. If I just change the type then I get a error message because << is not for type double. What can I do?

Thanks