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

 Copyright (C) 2003 RiskMap 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 curiouslyrecurring.hpp
    \brief Curiously recurring template pattern

#ifndef quantlib_curiously_recurring_h
#define quantlib_curiously_recurring_h

#include <ql/qldefines.hpp>

namespace QuantLib {

    //! Support for the curiously recurring template pattern
    /*! See James O. Coplien. A Curiously Recurring Template Pattern.
        In Stanley B. Lippman, editor, C++ Gems, 135-144.
        Cambridge University Press, New York, New York, 1996.

        \ingroup patterns
    template <class Impl>
00039     class CuriouslyRecurringTemplate {
        // not meant to be instantiated as such
        CuriouslyRecurringTemplate() {}
        ~CuriouslyRecurringTemplate() {}
        // support for the curiously recurring template pattern
        Impl& impl() {
            return static_cast<Impl&>(*this);
        const Impl& impl() const {
            return static_cast<const Impl&>(*this);



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