Uninitialized member variable boost::numeric::odeint::bulrisch_stoer<>::m_dt_last

[HHildenbrandt]

It seems that m_dt_last is used w/o initialization in the first call to try_check:

// boots/numeric/odeint/stepper/bulrisch_stoer.hpp
206        if( dt != m_dt_last )    // <-- m_dt_last indeterminate?
207        {
208          reset(); // step size changed from outside -> reset
209        }