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

 Copyright (C) 2004 StatPro Italia srl

 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 extrapolation.hpp
    \brief class-wide extrapolation settings

#ifndef quantlib_extrapolation_hpp
#define quantlib_extrapolation_hpp

#include <ql/qldefines.hpp>

namespace QuantLib {

    //! base class for classes possibly allowing extrapolation
00032     class Extrapolator {
        Extrapolator() : extrapolate_(false) {}
        virtual ~Extrapolator() {}
        //! \name modifiers
        //! enable extrapolation in subsequent calls
00039         void enableExtrapolation(bool b = true) { extrapolate_ = b; }
        //! disable extrapolation in subsequent calls
00041         void disableExtrapolation(bool b = true) { extrapolate_ = !b; }
        //! \name inspectors
        //! tells whether extrapolation is enabled
00046         bool allowsExtrapolation() const { return extrapolate_; }
        bool extrapolate_;



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