1 | // -*- C++ -*- |
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2 | /*************************************************************************** |
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3 | * random/default.h Default IRNG wrapper class |
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4 | * |
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5 | * $Id$ |
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6 | * |
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7 | * Copyright (C) 1997-2011 Todd Veldhuizen <tveldhui@acm.org> |
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8 | * |
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9 | * This file is a part of Blitz. |
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10 | * |
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11 | * Blitz is free software: you can redistribute it and/or modify |
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12 | * it under the terms of the GNU Lesser General Public License |
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13 | * as published by the Free Software Foundation, either version 3 |
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14 | * of the License, or (at your option) any later version. |
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15 | * |
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16 | * Blitz is distributed in the hope that it will be useful, |
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17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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19 | * GNU Lesser General Public License for more details. |
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20 | * |
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21 | * You should have received a copy of the GNU Lesser General Public |
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22 | * License along with Blitz. If not, see <http://www.gnu.org/licenses/>. |
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23 | * |
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24 | * Suggestions: blitz-devel@lists.sourceforge.net |
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25 | * Bugs: blitz-support@lists.sourceforge.net |
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26 | * |
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27 | * For more information, please see the Blitz++ Home Page: |
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28 | * https://sourceforge.net/projects/blitz/ |
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29 | * |
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30 | ***************************************************************************/ |
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31 | |
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32 | #ifndef BZ_RANDOM_DEFAULT_H |
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33 | #define BZ_RANDOM_DEFAULT_H |
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34 | |
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35 | #include <random/mt.h> |
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36 | |
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37 | BZ_NAMESPACE(ranlib) |
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38 | |
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39 | // Some terminology: |
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40 | // IRNG = Integer Random Number Generator. IRNGs generate random |
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41 | // integers, which are used to create floating-point random |
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42 | // numbers. |
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43 | // RNG = Random Number Generator. RNGs use IRNGs to create floating- |
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44 | // point random numbers following desired distributions. |
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45 | |
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46 | typedef float defaultType; |
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47 | |
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48 | // These are type tags. A RNG with sharedState shares an IRNG |
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49 | // with other RNGs. An RNG with independentState |
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50 | // contains its own IRNG. Generally, sharedState RNGs should be |
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51 | // used. |
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52 | |
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53 | struct sharedState { }; |
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54 | struct independentState { }; |
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55 | typedef sharedState defaultState; |
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56 | |
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57 | typedef unsigned int IRNG_int; |
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58 | |
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59 | |
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60 | // IRNGWrapper handles shared and independent state IRNGs. |
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61 | // If a class inherits from IRNGWrapper<IRNG,sharedState>, |
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62 | // it gets a static IRNG (i.e. the IRNG state is shared among |
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63 | // all RNGs); if it inherits from IRNGWrapper<IRNG,independentState>, |
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64 | // it gets an independent IRNG (the IRNG state is encapsulated |
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65 | // in the RNG, and is not shared among RNGs). |
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66 | |
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67 | template<typename IRNG, typename state> |
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68 | class IRNGWrapper { |
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69 | }; |
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70 | |
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71 | template<typename IRNG> |
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72 | class IRNGWrapper<IRNG,sharedState> { |
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73 | |
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74 | public: |
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75 | void seed(IRNG_int x) |
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76 | { irng_.seed(x); } |
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77 | |
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78 | void seed(std::vector<IRNG_int> x) |
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79 | { irng_.seed(x); } |
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80 | |
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81 | typedef typename IRNG::T_state T_state; |
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82 | T_state getState() const { return irng_.getState(); } |
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83 | std::string getStateString() const { return irng_.getStateString(); } |
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84 | void setState(const T_state& s) { irng_.setState(s); } |
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85 | void setState(const std::string& s) { irng_.setState(s); } |
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86 | |
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87 | protected: |
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88 | static IRNG irng_; |
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89 | }; |
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90 | |
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91 | template<typename IRNG> |
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92 | IRNG IRNGWrapper<IRNG,sharedState>::irng_; |
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93 | |
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94 | template<typename IRNG> |
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95 | class IRNGWrapper<IRNG,independentState> { |
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96 | |
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97 | public: |
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98 | IRNGWrapper() {}; |
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99 | IRNGWrapper(unsigned int i) : irng_(MersenneTwisterCreator::create(i)) {}; |
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100 | |
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101 | void seed(IRNG_int x) |
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102 | { irng_.seed(x); } |
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103 | |
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104 | void seed(std::vector<IRNG_int> x) |
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105 | { irng_.seed(x); } |
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106 | |
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107 | typedef typename IRNG::T_state T_state; |
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108 | T_state getState() const { return irng_.getState(); } |
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109 | std::string getStateString() const { return irng_.getStateString(); } |
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110 | void setState(const T_state& s) { irng_.setState(s); } |
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111 | void setState(const std::string& s) { irng_.setState(s); } |
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112 | |
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113 | protected: |
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114 | IRNG irng_; |
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115 | }; |
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116 | |
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117 | // defaultIRNG is a type alias for the default Integer Random |
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118 | // Number Generator (IRNG). |
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119 | |
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120 | typedef MersenneTwister defaultIRNG; |
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121 | |
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122 | BZ_NAMESPACE_END |
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123 | |
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124 | #endif // BZ_RANDOM_DEFAULT_H |
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125 | |
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