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annotate lphobos/std/random.d @ 837:331a176c1f4f

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Removed error on naked, not fully complete, but I'll be doing more work on it during this Christmas, and some things do work. Fixed taking delegate of final class method. see mini/delegate3.d.
author Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
date Tue, 09 Dec 2008 14:07:30 +0100
parents 88e23f8c2354
children
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1 /**
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2 * Macros:
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3 * WIKI = Phobos/StdRandom
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4 */
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5
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6 // random.d
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7 // www.digitalmars.com
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8
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9 /* NOTE: This file has been patched from the original DMD distribution to
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10 work with the GDC compiler.
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11
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12 Modified by David Friedman, September 2007
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13 */
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14
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15 module std.random;
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16
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17 // Segments of the code in this file Copyright (c) 1997 by Rick Booth
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18 // From "Inner Loops" by Rick Booth, Addison-Wesley
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19
662
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20 version(linux) version = Unix;
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21
473
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22 version (Win32)
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23 {
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24 extern(Windows) int QueryPerformanceCounter(ulong *count);
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25 }
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26 else version (Unix)
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27 {
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28 version(linux) import std.c.linux.linux;
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29 else private import std.c.unix.unix;
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30 }
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31
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32 /* ===================== Random ========================= */
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33
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34 // BUG: not multithreaded
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35
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36 private uint seed; // starting seed
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37 private uint index; // ith random number
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38
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39 /**
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40 * The random number generator is seeded at program startup with a random value.
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41 This ensures that each program generates a different sequence of random
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42 numbers. To generate a repeatable sequence, use rand_seed() to start the
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43 sequence. seed and index start it, and each successive value increments index.
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44 This means that the $(I n)th random number of the sequence can be directly
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45 generated
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46 by passing index + $(I n) to rand_seed().
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47
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48 Note: This is more random, but slower, than C's rand() function.
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49 To use C's rand() instead, import std.c.stdlib.
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50 */
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51
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52 void rand_seed(uint seed, uint index)
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53 {
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54 .seed = seed;
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55 .index = index;
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56 }
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57
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58 /**
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59 * Get the next random number in sequence.
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60 * BUGS: shares a global single state, not multithreaded
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61 */
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62
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63 uint rand()
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64 {
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65 static uint xormix1[20] =
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66 [
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67 0xbaa96887, 0x1e17d32c, 0x03bcdc3c, 0x0f33d1b2,
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68 0x76a6491d, 0xc570d85d, 0xe382b1e3, 0x78db4362,
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69 0x7439a9d4, 0x9cea8ac5, 0x89537c5c, 0x2588f55d,
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70 0x415b5e1d, 0x216e3d95, 0x85c662e7, 0x5e8ab368,
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71 0x3ea5cc8c, 0xd26a0f74, 0xf3a9222b, 0x48aad7e4
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72 ];
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73
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74 static uint xormix2[20] =
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75 [
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76 0x4b0f3b58, 0xe874f0c3, 0x6955c5a6, 0x55a7ca46,
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77 0x4d9a9d86, 0xfe28a195, 0xb1ca7865, 0x6b235751,
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78 0x9a997a61, 0xaa6e95c8, 0xaaa98ee1, 0x5af9154c,
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79 0xfc8e2263, 0x390f5e8c, 0x58ffd802, 0xac0a5eba,
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80 0xac4874f6, 0xa9df0913, 0x86be4c74, 0xed2c123b
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81 ];
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82
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83 uint hiword, loword, hihold, temp, itmpl, itmph, i;
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84
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85 loword = seed;
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86 hiword = index++;
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87 for (i = 0; i < 4; i++) // loop limit can be 2..20, we choose 4
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88 {
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89 hihold = hiword; // save hiword for later
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90 temp = hihold ^ xormix1[i]; // mix up bits of hiword
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91 itmpl = temp & 0xffff; // decompose to hi & lo
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92 itmph = temp >> 16; // 16-bit words
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93 temp = itmpl * itmpl + ~(itmph * itmph); // do a multiplicative mix
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94 temp = (temp >> 16) | (temp << 16); // swap hi and lo halves
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95 hiword = loword ^ ((temp ^ xormix2[i]) + itmpl * itmph); //loword mix
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96 loword = hihold; // old hiword is loword
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97 }
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98 return hiword;
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99 }
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100
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101 static this()
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102 {
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103 ulong s;
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104
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105 version(Win32)
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106 {
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107 QueryPerformanceCounter(&s);
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108 }
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109 else version(Unix)
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110 {
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111 // time.h
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112 // sys/time.h
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113
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114 timeval tv;
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115
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116 if (gettimeofday(&tv, null))
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117 { // Some error happened - try time() instead
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118 s = time(null);
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119 }
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120 else
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121 {
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122 s = cast(ulong)((cast(long)tv.tv_sec << 32) + tv.tv_usec);
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123 }
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124 }
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125 else version(NoSystem)
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126 {
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127 // nothing
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128 }
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129 else
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130 static assert(false);
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131 rand_seed(cast(uint) s, cast(uint)(s >> 32));
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132 }
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133
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134
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135 unittest
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136 {
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137 static uint results[10] =
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138 [
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139 0x8c0188cb,
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140 0xb161200c,
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141 0xfc904ac5,
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142 0x2702e049,
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143 0x9705a923,
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144 0x1c139d89,
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145 0x346b6d1f,
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146 0xf8c33e32,
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147 0xdb9fef76,
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148 0xa97fcb3f
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149 ];
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150 int i;
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151 uint seedsave = seed;
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152 uint indexsave = index;
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153
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154 rand_seed(1234, 5678);
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155 for (i = 0; i < 10; i++)
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156 { uint r = rand();
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157 //printf("0x%x,\n", rand());
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158 assert(r == results[i]);
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159 }
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160
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161 seed = seedsave;
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162 index = indexsave;
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163 }