Line data    Source code

       1             : /* +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
       2             :    Copyright (c) 2012-2023 The plumed team
       3             :    (see the PEOPLE file at the root of the distribution for a list of names)
       4             : 
       5             :    See http://www.plumed.org for more information.
       6             : 
       7             :    This file is part of plumed, version 2.
       8             : 
       9             :    plumed is free software: you can redistribute it and/or modify
      10             :    it under the terms of the GNU Lesser General Public License as published by
      11             :    the Free Software Foundation, either version 3 of the License, or
      12             :    (at your option) any later version.
      13             : 
      14             :    plumed is distributed in the hope that it will be useful,
      15             :    but WITHOUT ANY WARRANTY; without even the implied warranty of
      16             :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      17             :    GNU Lesser General Public License for more details.
      18             : 
      19             :    You should have received a copy of the GNU Lesser General Public License
      20             :    along with plumed.  If not, see <http://www.gnu.org/licenses/>.
      21             : +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ */
      22             : #ifndef __PLUMED_tools_Random_h
      23             : #define __PLUMED_tools_Random_h
      24             : 
      25             : #include <string>
      26             : #include <vector>
      27             : #include <iosfwd>
      28             : 
      29             : namespace PLMD {
      30             : 
      31             : /// \ingroup TOOLBOX
      32      812727 : class Random {
      33             :   static constexpr int IA=16807;
      34             :   static constexpr int IM=2147483647;
      35             :   static constexpr int IQ=127773;
      36             :   static constexpr int IR=2836;
      37             :   static constexpr int NTAB=32;
      38             :   static constexpr int NDIV=(1+(IM-1)/NTAB);
      39             :   static constexpr double fact=5.9604644775390625e-8;     /* 1 / 2^24  */
      40             :   static constexpr double EPS=3.0e-16;
      41             :   static constexpr double AM=1.0/IM;
      42             :   static constexpr double RNMX=1.0-EPS;
      43             :   static const std::string noname;
      44             :   bool incPrec;
      45             :   bool switchGaussian;
      46             :   double saveGaussian;
      47             :   int iy;
      48             :   int iv[NTAB];
      49             :   int idum;
      50             :   std::string name;
      51             : public:
      52             :   explicit Random(const std::string & title=noname);
      53             :   void setSeed(int idum);
      54             :   double RandU01();
      55             :   double U01();
      56             :   double U01d();
      57             :   int RandInt(int i);
      58             :   void Shuffle(std::vector<unsigned>& vec);
      59             :   void WriteStateFull(std::ostream &)const;
      60             :   void ReadStateFull (std::istream &);
      61             :   void fromString(const std::string & str);
      62             :   void toString(std::string & str)const;
      63             :   friend std::ostream & operator<<(std::ostream & out,const Random & rng) {
      64             :     rng.WriteStateFull(out);
      65             :     return out;
      66             :   }
      67             :   friend std::istream & operator>>(std::istream & in,Random & rng) {
      68             :     rng.ReadStateFull(in);
      69             :     return in;
      70             :   }
      71             :   double Gaussian();
      72             :   void IncreasedPrecis(bool i) {
      73             :     incPrec=i;
      74             :   }
      75             : };
      76             : 
      77             : }
      78             : 
      79             : #endif
      80             :