factorial.hpp

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/* -*- mode: c++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
 
/*
 Copyright (C) 2003 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
 <http://quantlib.org/license.shtml>.
 
 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 factorial.hpp
    \brief Factorial numbers calculator
*/
 
#ifndef quantlib_factorial_hpp
#define quantlib_factorial_hpp
 
#include <ql/types.hpp>
 
namespace QuantLib {
 
    //! %Factorial numbers calculator
    /*! \test the correctness of the returned value is tested by
              checking it against numerical calculations.
    */
    class Factorial {
      public:
        static Real get(Natural n);
        static Real ln(Natural n);
      private:
        Factorial() = default;
    };
 
}
 
 
#endif