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NegExp.hpp

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/*******************************************************************************
 * This file is part of openWNS (open Wireless Network Simulator)
 * _____________________________________________________________________________
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 * Copyright (C) 2004-2007
 * Chair of Communication Networks (ComNets)
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 * openWNS is free software; you can redistribute it and/or modify it under the
 * terms of the GNU Lesser General Public License version 2 as published by the
 * Free Software Foundation;
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 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
 * A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
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#ifndef WNS_DISTRIBUTION_NEGEXP_HPP
#define WNS_DISTRIBUTION_NEGEXP_HPP

#include <WNS/distribution/Distribution.hpp>
#include <WNS/rng/RNGen.hpp>

namespace wns { namespace distribution {

    typedef wns::rng::VariateGenerator< boost::exponential_distribution<> > NegExpDist;

    class NegExp :
        public Distribution,
        public IHasMean
    {
    public:
        explicit
        NegExp(const double mean, 
            wns::rng::RNGen* rng = wns::simulator::getRNG());

        explicit
        NegExp(const pyconfig::View& config);

        explicit
        NegExp(wns::rng::RNGen* rng, const pyconfig::View& config);

        virtual
        ~NegExp();

        virtual double
        operator()();

        virtual double
        getMean() const;

        virtual std::string
        paramString() const;

    private:
        double mean_;
        NegExpDist dis_;
    };
} // distribution
} // wns

#endif // NOT defined WNS_DISTRIBUTION_NEGEXP_HPP

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