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The simplest solution to do what you're trying to do is to simply call two functions within a "generic" callback function:

ImuSubscriber = nh.subscribe ("/mikrokopter/fc_debug", 100, &MikrokopterControl::genericCallback, this);

...

void MikrokopterControl::genericCallback(const sensor_msgs::IMU& data)
{
    function1(data);
    function2(data);
}

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