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

 Copyright (C) 2007 Ferdinando Ametrano
 Copyright (C) 2007 Mark Joshi

 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_piecewise_const_abcd_variance_hpp
#define quantlib_piecewise_const_abcd_variance_hpp

#include <ql/models/marketmodels/models/piecewiseconstantvariance.hpp>
#include <ql/models/marketmodels/evolutiondescription.hpp>

namespace QuantLib {

    class PiecewiseConstantAbcdVariance : public PiecewiseConstantVariance {
        PiecewiseConstantAbcdVariance(Real a, Real b, Real c, Real d,
                                      Size resetIndex,
                                      const std::vector<Time>& rateTimes);
        const std::vector<Real>& variances() const;
        const std::vector<Real>& volatilities() const;
        const std::vector<Time>& rateTimes() const;
        std::vector<Real> variances_;
        std::vector<Real> volatilities_;
        std::vector<Time> rateTimes_;




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