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/* -*- mode: c++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */

 Copyright (C) 2005 Joseph Wang

 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

 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.

/*! \file fdmultiperiodengine.hpp
    \brief base engine for options with events happening at specific times

#ifndef quantlib_fd_multi_period_engine_hpp
#define quantlib_fd_multi_period_engine_hpp

#include <ql/Instruments/dividendvanillaoption.hpp>
#include <ql/PricingEngines/Vanilla/fdvanillaengine.hpp>
#include <ql/FiniteDifferences/fdtypedefs.hpp>

namespace QuantLib {

    class FDMultiPeriodEngine : public DividendVanillaOption::engine,
                                public FDVanillaEngine {
        FDMultiPeriodEngine(Size gridPoints=100, Size timeSteps=100,
                            bool timeDependent = false);
        Size timeStepPerPeriod_;
        mutable Array prices_;
        void calculate() const;
        mutable boost::shared_ptr<StandardStepCondition > stepCondition_;
        mutable boost::shared_ptr<StandardFiniteDifferenceModel> model_;
        virtual void executeIntermediateStep(Size step) const = 0;
        virtual void initializeStepCondition() const;
        virtual void initializeModel() const;
        Time getDividendTime(int i) const {
            return getYearFraction(arguments_.dividendDates[i]);



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