third_party/mt19937ar/mt19937ar.h

   1 /*
   2  A C-program for MT19937, with initialization improved 2002/1/26.
   3  Coded by Takuji Nishimura and Makoto Matsumoto.
   4
   5  Before using, initialize the state by using init_genrand(seed)
   6  or init_by_array(init_key, key_length).
   7
   8  Copyright (C) 1997 - 2002, Makoto Matsumoto and Takuji Nishimura,
   9  All rights reserved.
  10
  11  Redistribution and use in source and binary forms, with or without
  12  modification, are permitted provided that the following conditions
  13  are met:
  14
  15  1. Redistributions of source code must retain the above copyright
  16  notice, this list of conditions and the following disclaimer.
  17
  18  2. Redistributions in binary form must reproduce the above copyright
  19  notice, this list of conditions and the following disclaimer in the
  20  documentation and/or other materials provided with the distribution.
  21
  22  3. The names of its contributors may not be used to endorse or promote
  23  products derived from this software without specific prior written
  24  permission.
  25
  26  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  27  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  28  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  29  A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  30  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  31  EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  32  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  33  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  34  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  35  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  36  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  37
  38
  39  Any feedback is very welcome.
  40  http://www.math.sci.hiroshima-u.ac.jp/~m-mat/MT/emt.html
  41  email: m-mat @ math.sci.hiroshima-u.ac.jp (remove space)
  42  */
  43
  44 #ifndef THIRD_PARTY_MT19937AR_MT19937AR_H_
  45 #define THIRD_PARTY_MT19937AR_MT19937AR_H_
  46
  47 #include <vector>
  48
  49 #include "base/basictypes.h"
  50
  51 class MersenneTwister {
  52  public:
  53   MersenneTwister();
  54   ~MersenneTwister();
  55
  56   void init_genrand(uint32 s);
  57   void init_by_array(uint32 init_key[], int key_length);
  58   uint32 genrand_int32(void);
  59
  60  private:
  61   std::vector<uint32> mt; /* the array for the state vector  */
  62   int mti; /* mti==N+1 means mt[N] is not initialized */
  63 };
  64
  65 #endif  // THIRD_PARTY_MT19937AR_MT19937AR_H_