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1 | /* |
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2 | * This file is part of Crossfire TRT, the Multiplayer Online Role Playing Game. |
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3 | * |
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4 | * Copyright (©) 2005,2006,2007 Marc Alexander Lehmann / Robin Redeker / the Crossfire TRT team |
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5 | * |
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6 | * Crossfire TRT is free software; you can redistribute it and/or modify it |
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7 | * under the terms of the GNU General Public License as published by the Free |
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8 | * Software Foundation; either version 2 of the License, or (at your option) |
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9 | * any later version. |
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10 | * |
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11 | * This program is distributed in the hope that it will be useful, but |
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12 | * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
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13 | * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 | * for more details. |
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15 | * |
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16 | * You should have received a copy of the GNU General Public License along |
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17 | * with Crossfire TRT; if not, write to the Free Software Foundation, Inc. 51 |
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18 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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19 | * |
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20 | * The authors can be reached via e-mail to <crossfire@schmorp.de> |
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21 | */ |
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22 | |
1 | #ifndef UTIL_H__ |
23 | #ifndef UTIL_H__ |
2 | #define UTIL_H__ |
24 | #define UTIL_H__ |
3 | |
25 | |
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26 | //#define PREFER_MALLOC |
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27 | |
4 | #if __GNUC__ >= 3 |
28 | #if __GNUC__ >= 3 |
5 | # define is_constant(c) __builtin_constant_p (c) |
29 | # define is_constant(c) __builtin_constant_p (c) |
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30 | # define expect(expr,value) __builtin_expect ((expr),(value)) |
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31 | # define prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) |
6 | #else |
32 | #else |
7 | # define is_constant(c) 0 |
33 | # define is_constant(c) 0 |
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34 | # define expect(expr,value) (expr) |
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35 | # define prefetch(addr,rw,locality) |
8 | #endif |
36 | #endif |
9 | |
37 | |
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38 | // put into ifs if you are very sure that the expression |
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39 | // is mostly true or mosty false. note that these return |
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40 | // booleans, not the expression. |
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41 | #define expect_false(expr) expect ((expr) != 0, 0) |
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42 | #define expect_true(expr) expect ((expr) != 0, 1) |
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43 | |
10 | #include <cstddef> |
44 | #include <cstddef> |
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45 | #include <cmath> |
11 | #include <new> |
46 | #include <new> |
12 | #include <vector> |
47 | #include <vector> |
13 | |
48 | |
14 | #include <glib.h> |
49 | #include <glib.h> |
15 | |
50 | |
16 | #include <shstr.h> |
51 | #include <shstr.h> |
17 | #include <traits.h> |
52 | #include <traits.h> |
18 | |
53 | |
19 | // use a gcc extension for auto declarations until ISO C++ sanctifies them |
54 | // use a gcc extension for auto declarations until ISO C++ sanctifies them |
20 | #define AUTODECL(var,expr) typeof(expr) var = (expr) |
55 | #define auto(var,expr) typeof(expr) var = (expr) |
21 | |
56 | |
22 | // very ugly macro that basicaly declares and initialises a variable |
57 | // very ugly macro that basicaly declares and initialises a variable |
23 | // that is in scope for the next statement only |
58 | // that is in scope for the next statement only |
24 | // works only for stuff that can be assigned 0 and converts to false |
59 | // works only for stuff that can be assigned 0 and converts to false |
25 | // (note: works great for pointers) |
60 | // (note: works great for pointers) |
… | |
… | |
32 | |
67 | |
33 | // in range excluding end |
68 | // in range excluding end |
34 | #define IN_RANGE_EXC(val,beg,end) \ |
69 | #define IN_RANGE_EXC(val,beg,end) \ |
35 | ((unsigned int)(val) - (unsigned int)(beg) < (unsigned int)(end) - (unsigned int)(beg)) |
70 | ((unsigned int)(val) - (unsigned int)(beg) < (unsigned int)(end) - (unsigned int)(beg)) |
36 | |
71 | |
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72 | void fork_abort (const char *msg); |
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73 | |
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74 | // rationale for using (U) not (T) is to reduce signed/unsigned issues, |
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75 | // as a is often a constant while b is the variable. it is still a bug, though. |
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76 | template<typename T, typename U> static inline T min (T a, U b) { return (U)a < b ? (U)a : b; } |
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77 | template<typename T, typename U> static inline T max (T a, U b) { return (U)a > b ? (U)a : b; } |
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78 | template<typename T, typename U, typename V> static inline T clamp (T v, U a, V b) { return v < (T)a ? (T)a : v >(T)b ? (T)b : v; } |
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79 | |
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80 | template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; } |
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81 | |
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82 | template<typename T> |
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83 | static inline T |
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84 | lerp (T val, T min_in, T max_in, T min_out, T max_out) |
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85 | { |
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86 | return (val - min_in) * (max_out - min_out) / (max_in - min_in) + min_out; |
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87 | } |
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88 | |
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89 | // lots of stuff taken from FXT |
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90 | |
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91 | /* Rotate right. This is used in various places for checksumming */ |
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92 | //TODO: that sucks, use a better checksum algo |
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93 | static inline uint32_t |
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94 | rotate_right (uint32_t c, uint32_t count = 1) |
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95 | { |
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96 | return (c << (32 - count)) | (c >> count); |
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97 | } |
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98 | |
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99 | static inline uint32_t |
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100 | rotate_left (uint32_t c, uint32_t count = 1) |
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101 | { |
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102 | return (c >> (32 - count)) | (c << count); |
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103 | } |
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104 | |
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105 | // Return abs(a-b) |
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106 | // Both a and b must not have the most significant bit set |
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107 | static inline uint32_t |
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108 | upos_abs_diff (uint32_t a, uint32_t b) |
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109 | { |
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110 | long d1 = b - a; |
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111 | long d2 = (d1 & (d1 >> 31)) << 1; |
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112 | |
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113 | return d1 - d2; // == (b - d) - (a + d); |
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114 | } |
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115 | |
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116 | // Both a and b must not have the most significant bit set |
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117 | static inline uint32_t |
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118 | upos_min (uint32_t a, uint32_t b) |
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119 | { |
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120 | int32_t d = b - a; |
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121 | d &= d >> 31; |
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122 | return a + d; |
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123 | } |
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124 | |
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125 | // Both a and b must not have the most significant bit set |
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126 | static inline uint32_t |
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127 | upos_max (uint32_t a, uint32_t b) |
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128 | { |
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129 | int32_t d = b - a; |
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130 | d &= d >> 31; |
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131 | return b - d; |
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132 | } |
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133 | |
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134 | // this is much faster than crossfires original algorithm |
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135 | // on modern cpus |
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136 | inline int |
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137 | isqrt (int n) |
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138 | { |
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139 | return (int)sqrtf ((float)n); |
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140 | } |
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141 | |
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142 | // this is only twice as fast as naive sqrtf (dx*dy+dy*dy) |
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143 | #if 0 |
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144 | // and has a max. error of 6 in the range -100..+100. |
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145 | #else |
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146 | // and has a max. error of 9 in the range -100..+100. |
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147 | #endif |
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148 | inline int |
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149 | idistance (int dx, int dy) |
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150 | { |
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151 | unsigned int dx_ = abs (dx); |
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152 | unsigned int dy_ = abs (dy); |
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153 | |
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154 | #if 0 |
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155 | return dx_ > dy_ |
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156 | ? (dx_ * 61685 + dy_ * 26870) >> 16 |
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157 | : (dy_ * 61685 + dx_ * 26870) >> 16; |
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158 | #else |
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159 | return dx_ + dy_ - min (dx_, dy_) * 5 / 8; |
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160 | #endif |
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161 | } |
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162 | |
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163 | /* |
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164 | * absdir(int): Returns a number between 1 and 8, which represent |
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165 | * the "absolute" direction of a number (it actually takes care of |
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166 | * "overflow" in previous calculations of a direction). |
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167 | */ |
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168 | inline int |
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169 | absdir (int d) |
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170 | { |
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171 | return ((d - 1) & 7) + 1; |
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172 | } |
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173 | |
37 | // makes dynamically allocated objects zero-initialised |
174 | // makes dynamically allocated objects zero-initialised |
38 | struct zero_initialised |
175 | struct zero_initialised |
39 | { |
176 | { |
40 | void *operator new (size_t s, void *p) |
177 | void *operator new (size_t s, void *p) |
41 | { |
178 | { |
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82 | |
219 | |
83 | // for symmetry |
220 | // for symmetry |
84 | template<typename T> |
221 | template<typename T> |
85 | inline void sfree (T *ptr, int n = 1) throw () |
222 | inline void sfree (T *ptr, int n = 1) throw () |
86 | { |
223 | { |
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224 | #ifdef PREFER_MALLOC |
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225 | free (ptr); |
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226 | #else |
87 | g_slice_free1 (n * sizeof (T), (void *)ptr); |
227 | g_slice_free1 (n * sizeof (T), (void *)ptr); |
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228 | #endif |
88 | } |
229 | } |
89 | |
230 | |
90 | // a STL-compatible allocator that uses g_slice |
231 | // a STL-compatible allocator that uses g_slice |
91 | // boy, this is verbose |
232 | // boy, this is verbose |
92 | template<typename Tp> |
233 | template<typename Tp> |
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139 | void destroy (pointer p) |
280 | void destroy (pointer p) |
140 | { |
281 | { |
141 | p->~Tp (); |
282 | p->~Tp (); |
142 | } |
283 | } |
143 | }; |
284 | }; |
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285 | |
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286 | // P. L'Ecuyer, “Maximally Equidistributed Combined Tausworthe Generators”, Mathematics of Computation, 65, 213 (1996), 203–213. |
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287 | // http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme.ps |
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288 | // http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme2.ps |
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289 | struct tausworthe_random_generator |
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290 | { |
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291 | // generator |
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292 | uint32_t state [4]; |
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293 | |
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294 | void operator =(const tausworthe_random_generator &src) |
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295 | { |
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296 | state [0] = src.state [0]; |
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297 | state [1] = src.state [1]; |
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298 | state [2] = src.state [2]; |
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299 | state [3] = src.state [3]; |
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300 | } |
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301 | |
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302 | void seed (uint32_t seed); |
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303 | uint32_t next (); |
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304 | |
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305 | // uniform distribution |
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306 | uint32_t operator ()(uint32_t num) |
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307 | { |
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308 | return is_constant (num) |
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309 | ? (next () * (uint64_t)num) >> 32U |
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310 | : get_range (num); |
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311 | } |
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312 | |
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313 | // return a number within (min .. max) |
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314 | int operator () (int r_min, int r_max) |
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315 | { |
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316 | return is_constant (r_min) && is_constant (r_max) && r_min <= r_max |
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317 | ? r_min + operator ()(r_max - r_min + 1) |
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318 | : get_range (r_min, r_max); |
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319 | } |
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320 | |
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321 | double operator ()() |
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322 | { |
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323 | return this->next () / (double)0xFFFFFFFFU; |
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324 | } |
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325 | |
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326 | protected: |
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327 | uint32_t get_range (uint32_t r_max); |
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328 | int get_range (int r_min, int r_max); |
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329 | }; |
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330 | |
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331 | typedef tausworthe_random_generator rand_gen; |
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332 | |
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333 | extern rand_gen rndm; |
144 | |
334 | |
145 | template<class T> |
335 | template<class T> |
146 | struct refptr |
336 | struct refptr |
147 | { |
337 | { |
148 | T *p; |
338 | T *p; |
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248 | } |
438 | } |
249 | |
439 | |
250 | void erase (T *obj) |
440 | void erase (T *obj) |
251 | { |
441 | { |
252 | assert (obj->*index); |
442 | assert (obj->*index); |
253 | int pos = obj->*index; |
443 | unsigned int pos = obj->*index; |
254 | obj->*index = 0; |
444 | obj->*index = 0; |
255 | |
445 | |
256 | if (pos < this->size ()) |
446 | if (pos < this->size ()) |
257 | { |
447 | { |
258 | (*this)[pos - 1] = (*this)[this->size () - 1]; |
448 | (*this)[pos - 1] = (*this)[this->size () - 1]; |
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266 | { |
456 | { |
267 | errase (&obj); |
457 | errase (&obj); |
268 | } |
458 | } |
269 | }; |
459 | }; |
270 | |
460 | |
271 | template<typename T, typename U> static inline T min (T a, U b) { return a < (T)b ? a : (T)b; } |
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272 | template<typename T, typename U> static inline T max (T a, U b) { return a > (T)b ? a : (T)b; } |
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273 | template<typename T, typename U, typename V> static inline T clamp (T v, U a, V b) { return v < (T)a ? a : v >(T)b ? b : v; } |
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274 | |
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275 | template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; } |
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276 | |
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277 | // basically does what strncpy should do, but appends "..." to strings exceeding length |
461 | // basically does what strncpy should do, but appends "..." to strings exceeding length |
278 | void assign (char *dst, const char *src, int maxlen); |
462 | void assign (char *dst, const char *src, int maxlen); |
279 | |
463 | |
280 | // type-safe version of assign |
464 | // type-safe version of assign |
281 | template<int N> |
465 | template<int N> |
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289 | // return current time as timestampe |
473 | // return current time as timestampe |
290 | tstamp now (); |
474 | tstamp now (); |
291 | |
475 | |
292 | int similar_direction (int a, int b); |
476 | int similar_direction (int a, int b); |
293 | |
477 | |
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478 | // like printf, but returns a std::string |
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479 | const std::string format (const char *format, ...); |
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480 | |
294 | #endif |
481 | #endif |
295 | |
482 | |