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

 Copyright (C) 2006 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_brownian_generator_hpp
#define quantlib_brownian_generator_hpp

#include <ql/Math/array.hpp>
#include <boost/shared_ptr.hpp>

namespace QuantLib {

    class BrownianGenerator {
        virtual ~BrownianGenerator() {}

        virtual Real nextStep(Array&) = 0;
        virtual Real nextPath() = 0;

        virtual Size numberOfFactors() const = 0;
        virtual Size numberOfSteps() const = 0;


    class BrownianGeneratorFactory {
        virtual ~BrownianGeneratorFactory() {}
        virtual boost::shared_ptr<BrownianGenerator> create(Size factors,
                                                            Size steps) const = 0;



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