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

 Copyright (C) 2003, 2004 Ferdinando Ametrano

 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 baroneadesiwhaleyengine.hpp
    \brief Barone-Adesi and Whaley approximation engine

#ifndef quantlib_barone_adesi_whaley_engine_hpp
#define quantlib_barone_adesi_whaley_engine_hpp

#include <ql/Instruments/vanillaoption.hpp>

namespace QuantLib {

    /*! Pricing engine for American options with
        Barone-Adesi and Whaley approximation (1987)

        \ingroup vanillaengines

        \test the correctness of the returned value is tested by
              reproducing results available in literature.
00039     class BaroneAdesiWhaleyApproximationEngine
        : public VanillaOption::engine {
        static Real criticalPrice(
            const boost::shared_ptr<StrikedTypePayoff>& payoff,
            DiscountFactor riskFreeDiscount,
            DiscountFactor dividendDiscount,
            Real variance,
            Real tolerance = 1e-6);
        void calculate() const;



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