fdhestonhullwhitevanillaengine.hpp

/* -*- mode: c++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
 
/*
 Copyright (C) 2009 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_fd_heston_hull_white_vanilla_engine_hpp
#define quantlib_fd_heston_hull_white_vanilla_engine_hpp
 
#include <ql/instruments/dividendvanillaoption.hpp>
#include <ql/models/equity/hestonmodel.hpp>
#include <ql/processes/hullwhiteprocess.hpp>
#include <ql/pricingengines/genericmodelengine.hpp>
#include <ql/methods/finitedifferences/solvers/fdmbackwardsolver.hpp>
#include <ql/methods/finitedifferences/solvers/fdmhestonhullwhitesolver.hpp>
 
namespace QuantLib {
 
    QL_DEPRECATED_DISABLE_WARNING
 
 
    class FdHestonHullWhiteVanillaEngine
        : public GenericModelEngine<HestonModel,
                                    DividendVanillaOption::arguments,
                                    DividendVanillaOption::results> {
        QL_DEPRECATED_ENABLE_WARNING
      public:
        FdHestonHullWhiteVanillaEngine(
            const ext::shared_ptr<HestonModel>& model,
            ext::shared_ptr<HullWhiteProcess> hwProcess,
            Real corrEquityShortRate,
            Size tGrid = 50,
            Size xGrid = 100,
            Size vGrid = 40,
            Size rGrid = 20,
            Size dampingSteps = 0,
            bool controlVariate = true,
            const FdmSchemeDesc& schemeDesc = FdmSchemeDesc::Hundsdorfer());
 
        FdHestonHullWhiteVanillaEngine(
            const ext::shared_ptr<HestonModel>& model,
            ext::shared_ptr<HullWhiteProcess> hwProcess,
            DividendSchedule dividends,
            Real corrEquityShortRate,
            Size tGrid = 50,
            Size xGrid = 100,
            Size vGrid = 40,
            Size rGrid = 20,
            Size dampingSteps = 0,
            bool controlVariate = true,
            const FdmSchemeDesc& schemeDesc = FdmSchemeDesc::Hundsdorfer());
 
        void calculate() const override;
 
        // multiple strikes caching engine
        void update() override;
        void enableMultipleStrikesCaching(const std::vector<Real>& strikes);
        
      private:
        const ext::shared_ptr<HullWhiteProcess> hwProcess_;
        DividendSchedule dividends_;
        bool explicitDividends_;
        const Real corrEquityShortRate_;
        const Size tGrid_, xGrid_, vGrid_, rGrid_;
        const Size dampingSteps_;
        const FdmSchemeDesc schemeDesc_;
        const bool controlVariate_;
        
        std::vector<Real> strikes_;
        QL_DEPRECATED_DISABLE_WARNING
        mutable std::vector<std::pair<DividendVanillaOption::arguments,
                                      DividendVanillaOption::results> >
                                                            cachedArgs2results_;
        QL_DEPRECATED_ENABLE_WARNING
    };
 
}
 
#endif