gnu/lib/libg++/g++-include/MLCG.h

   1 // This may look like C code, but it is really -*- C++ -*-
   2 /*
   3 Copyright (C) 1988 Free Software Foundation
   4     written by Dirk Grunwald (grunwald@cs.uiuc.edu)
   5
   6 This file is part of GNU CC.
   7
   8 GNU CC is distributed in the hope that it will be useful,
   9 but WITHOUT ANY WARRANTY.  No author or distributor
  10 accepts responsibility to anyone for the consequences of using it
  11 or for whether it serves any particular purpose or works at all,
  12 unless he says so in writing.  Refer to the GNU CC General Public
  13 License for full details.
  14
  15 Everyone is granted permission to copy, modify and redistribute
  16 GNU CC, but only under the conditions described in the
  17 GNU CC General Public License.   A copy of this license is
  18 supposed to have been given to you along with GNU CC so you
  19 can know your rights and responsibilities.  It should be in a
  20 file named COPYING.  Among other things, the copyright notice
  21 and this notice must be preserved on all copies.
  22 */
  23 #ifndef _MLCG_h
  24 #define _MLCG_h 1
  25 #ifdef __GNUG__
  26 #pragma once
  27 #pragma interface
  28 #endif
  29
  30 #include <RNG.h>
  31 #include <math.h>
  32
  33 //
  34 //      Multiplicative Linear Conguential Generator
  35 //
  36
  37 class MLCG : public RNG {
  38     long initialSeedOne;
  39     long initialSeedTwo;
  40     long seedOne;
  41     long seedTwo;
  42
  43 protected:
  44
  45 public:
  46     MLCG(long seed1 = 0, long seed2 = 1);
  47     //
  48     // Return a long-words word of random bits
  49     //
  50     virtual unsigned long asLong();
  51     virtual void reset();
  52     long seed1();
  53     void seed1(long);
  54     long seed2();
  55     void seed2(long);
  56     void reseed(long, long);
  57 };
  58
  59 #if defined(__OPTIMIZE__) || defined(USE_LIBGXX_INLINES)
  60
  61 inline long
  62 MLCG::seed1()
  63 {
  64     return(seedOne);
  65 }
  66
  67 inline void
  68 MLCG::seed1(long s)
  69 {
  70     initialSeedOne = s;
  71     reset();
  72 }
  73
  74 inline long
  75 MLCG::seed2()
  76 {
  77     return(seedTwo);
  78 }
  79
  80 inline void
  81 MLCG::seed2(long s)
  82 {
  83     initialSeedTwo = s;
  84     reset();
  85 }
  86
  87 inline void
  88 MLCG::reseed(long s1, long s2)
  89 {
  90     initialSeedOne = s1;
  91     initialSeedTwo = s2;
  92     reset();
  93 }
  94
  95 #endif
  96
  97 #endif