  Transitionless quantum driving achieves adiabatic evolution in a hurry, using
a counter-diabatic Hamiltonian to stifle non-adiabatic transitions. Here this
strategy is cast in terms of a generator of adiabatic transport, leading to a
classical analogue: dissipationless classical driving. For the single-particle
piston, this approach yields simple and exact expressions for both the
classical and quantal counter-diabatic terms. These results are further
generalized to even-power-law potentials in one degree of freedom.
