void Foam::CollidingCloud<CloudType>::restoreState()
{
    cloudReset(cloudCopyPtr_());
    cloudCopyPtr_.clear();
}
void Foam::KinematicCloud<CloudType>::restoreState()
{
    cloudReset(cloudCopyPtr_());
    cloudCopyPtr_.clear();
}
void Foam::SprayCloud<CloudType>::restoreState()
{
    cloudReset(cloudCopyPtr_());
    cloudCopyPtr_.clear();
}