analyticpdfhestonengine.hpp

/* -*- mode: c++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
 
/*
 Copyright (C) 2014 Klaus Spanderen
 
 This file is part of QuantLib, a free-software/open-source library
 for financial quantitative analysts and developers - http://quantlib.org/
 
 QuantLib is free software: you can redistribute it and/or modify it
 under the terms of the QuantLib license.  You should have received a
 copy of the license along with this program; if not, please email
 <quantlib-dev@lists.sf.net>. The license is also available online at
 <http://quantlib.org/license.shtml>.
 
 This program is distributed in the hope that it will be useful, but WITHOUT
 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 FOR A PARTICULAR PURPOSE.  See the license for more details.
*/
 
#ifndef quantlib_analytic_pdf_heston_engine_hpp
#define quantlib_analytic_pdf_heston_engine_hpp
 
#include <ql/instruments/vanillaoption.hpp>
#include <ql/models/equity/hestonmodel.hpp>
#include <ql/pricingengines/genericmodelengine.hpp>
 
namespace QuantLib {
 
 
    class AnalyticPDFHestonEngine
       : public GenericModelEngine<HestonModel,
                                   VanillaOption::arguments,
                                   VanillaOption::results> {
      public:
        explicit AnalyticPDFHestonEngine(ext::shared_ptr<HestonModel> model,
                                         Real gaussLobattoEps = 1e-6,
                                         Size gaussLobattoIntegrationOrder = 10000UL);
        void calculate() const override;
 
 
        // probability in x_t = ln(s_t)
        Real Pv(Real x_t, Time t) const;
 
        // cumulative distribution function Pr(x < X)
        Real cdf(Real X, Time t) const;
 
      private:
        Real weightedPayoff(Real x_t, Time t) const;
 
        const Size maxIntegrationIterations_;
        const Real integrationEps_;
 
        const ext::shared_ptr<HestonModel> model_;
    };
}
 
 
#endif