/***************************** RANDOMC.H *********************** 2001-10-24 AF *
*
* This file contains class declarations for the C++ library of uniform
* random number generators.
*
* Overview of classes:
* ====================
*
* class TRanrotBGenerator:
* Random number generator of type RANROT-B.
* Source file ranrotb.cpp
*
* class TRanrotWGenerator:
* Random number generator of type RANROT-W.
* Source file ranrotw.cpp
*
* class TRandomMotherOfAll:
* Random number generator of type Mother-of-All (Multiply with carry).
* Source file mother.cpp
*
* class TRandomMersenne:
* Random number generator of type Mersenne twister.
* Source file mersenne.cpp
*
* class TRandomMotRot:
* Combination of Mother-of-All and RANROT-W generators.
* Source file ranmoro.cpp and motrot.asm.
* Coded in assembly language for improved speed.
* Must link in RANDOMAO.LIB or RANDOMAC.LIB.
*
*
* Member functions (methods):
* ===========================
*
* All these classes have identical member functions:
*
* Constructor(long int seed):
* The seed can be any integer. Usually the time is used as seed.
* Executing a program twice with the same seed will give the same sequence of
* random numbers. A different seed will give a different sequence.
*
* double Random();
* Gives a floating point random number in the interval 0 <= x < 1.
* The resolution is 32 bits in TRanrotBGenerator, TRandomMotherOfAll and
* TRandomMersenne. 52 or 63 bits in TRanrotWGenerator. 63 bits in 
* TRandomMotRot.
*
* int IRandom(int min, int max);
* Gives an integer random number in the interval min <= x <= max. (max-min < MAXINT).
* The resolution is the same as for Random(). 
*
* unsigned long BRandom();
* Gives 32 random bits. 
* Only available in the classes TRanrotWGenerator and TRandomMersenne.
*
*
* Example:
* ========
* The file EX-RAN.CPP contains an example of how to generate random numbers.
*
*
* Further documentation:
* ======================
* The file randomc.htm contains further documentation on these random number
* generators.
*
* © 2002 Agner Fog. GNU General Public License www.gnu.org/copyleft/gpl.html
*******************************************************************************/

#ifndef MERSENNE_H
#define MERSENNE_H

#include <math.h>
#include <assert.h>
#include <stdio.h>


class TRandomMersenne {                // encapsulate random number generator
  #if 1
    // define constants for MT11213A:
    // (long constants cannot be defined as enum in 16-bit compilers)
    #define MERS_N   351
    #define MERS_M   175
    #define MERS_R   19
    #define MERS_U   11
    #define MERS_S   7
    #define MERS_T   15
    #define MERS_L   17
    #define MERS_A   0xE4BD75F5
    #define MERS_B   0x655E5280
    #define MERS_C   0xFFD58000
  #else    
    // or constants for MT19937:
    #define MERS_N   624
    #define MERS_M   397
    #define MERS_R   31
    #define MERS_U   11
    #define MERS_S   7
    #define MERS_T   15
    #define MERS_L   18
    #define MERS_A   0x9908B0DF
    #define MERS_B   0x9D2C5680
    #define MERS_C   0xEFC60000
  #endif
  public:
  TRandomMersenne(long int seed) {     // constructor
    RandomInit(seed);}
  void RandomInit(long int seed);      // re-seed
  long IRandom(long min, long max);    // output random integer
  double Random();                     // output random float
  unsigned long BRandom();             // output random bits
  private:
  unsigned long mt[MERS_N];            // state vector
  int mti;                             // index into mt
  enum TArch {LE, BE, NI};
  TArch Architecture;                  // conversion to float depends on computer architecture
  };    


#endif  
