Random.h

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/* +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
   Copyright (c) 2013 The plumed team
   (see the PEOPLE file at the root of the distribution for a list of names)

   See http://www.plumed-code.org for more information.

   This file is part of plumed, version 2.0.

   plumed is free software: you can redistribute it and/or modify
   it under the terms of the GNU Lesser General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.

   plumed 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
   GNU Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public License
   along with plumed.  If not, see <http://www.gnu.org/licenses/>.
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ */
#ifndef __PLUMED_tools_Random_h
#define __PLUMED_tools_Random_h

#include <string>
#include <iosfwd>

namespace PLMD{

/// \ingroup TOOLBOX
class Random{
        static const int IA=16807,IM=2147483647,IQ=127773,IR=2836,NTAB=32;
        static const int NDIV=(1+(IM-1)/NTAB);
        static const double EPS;
        static const double AM;
        static const double RNMX;
        static const double fact;
        static const std::string noname;
        bool incPrec;
        bool switchGaussian;
        double saveGaussian;
        int iy;
        int iv[NTAB];
        int idum;
        std::string name;
public:
        Random(const std::string & name=noname);
        void setSeed(int idum);
        double RandU01();
        double U01();
        double U01d();
        void WriteStateFull(std::ostream &)const;
        void ReadStateFull (std::istream &);
        void fromString(const std::string & str);
        void toString(std::string & str)const;
        friend std::ostream & operator<<(std::ostream & out,const Random & rng){
                rng.WriteStateFull(out); return out;
        }
        friend std::istream & operator>>(std::istream & in,Random & rng){
                rng.ReadStateFull(in); return in;
        }
        double Gaussian();
        void IncreasedPrecis(bool i){incPrec=i;}
};

}

#endif