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

 Copyright (C) 2006 Giorgio Facchinetti

 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.

#ifndef quantlib_market_model_coterminal_swaps_hpp
#define quantlib_market_model_coterminal_swaps_hpp

#include <ql/MarketModels/Products/multiproductmultistep.hpp>

namespace QuantLib {

    class MultiStepCoterminalSwaps : public MultiProductMultiStep {
        MultiStepCoterminalSwaps(const std::vector<Time>& rateTimes,
                                 const std::vector<Real>& fixedAccruals,
                                 const std::vector<Real>& floatingAccruals,
                                 const std::vector<Time>& paymentTimes,
                           double fixedRate);
        //! \name MarketModelMultiProduct interface
        std::vector<Time> possibleCashFlowTimes() const;
        Size numberOfProducts() const;
        Size maxNumberOfCashFlowsPerProductPerStep() const;
        void reset();
        bool nextTimeStep(
                     const CurveState& currentState,
                     std::vector<Size>& numberCashFlowsThisStep,
                     std::vector<std::vector<CashFlow> >& cashFlowsGenerated);
        std::auto_ptr<MarketModelMultiProduct> clone() const;
        std::vector<Real> fixedAccruals_, floatingAccruals_;
        std::vector<Time> paymentTimes_;
        double fixedRate_;
        Size lastIndex_;
        // things that vary in a path
        Size currentIndex_;

    // inline definitions

    inline std::vector<Time>
    MultiStepCoterminalSwaps::possibleCashFlowTimes() const {
        return paymentTimes_;

    inline Size MultiStepCoterminalSwaps::numberOfProducts() const {
        return lastIndex_;

    inline Size
    MultiStepCoterminalSwaps::maxNumberOfCashFlowsPerProductPerStep() const {
        return 2;

    inline void MultiStepCoterminalSwaps::reset() {



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