class HestonCharacteristicExponent implements MartingaleCharacteristicExponent {

  public HestonCharacteristicExponent withTheta(final double theta) {
    return new HestonCharacteristicExponent(_kappa, theta, _vol0, _omega, _rho);
  }

  public  HestonCharacteristicExponent(final double kappa, final double theta, final double vol0, final double omega, final double rho);
  public  HestonCharacteristicExponent(final HestonModelData data);

}