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1 | /* |
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2 | * This file is part of Deliantra, the Roguelike Realtime MMORPG. |
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3 | * |
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4 | * Copyright (©) 2005,2006,2007,2008 Marc Alexander Lehmann / Robin Redeker / the Deliantra team |
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5 | * |
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6 | * Deliantra is free software: you can redistribute it and/or modify |
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7 | * it under the terms of the GNU General Public License as published by |
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8 | * the Free Software Foundation, either version 3 of the License, or |
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9 | * (at your option) 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, |
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12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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14 | * GNU General Public License 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 |
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17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
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18 | * |
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19 | * The authors can be reached via e-mail to <support@deliantra.net> |
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20 | */ |
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21 | |
1 | #ifndef UTIL_H__ |
22 | #ifndef UTIL_H__ |
2 | #define UTIL_H__ |
23 | #define UTIL_H__ |
3 | |
24 | |
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25 | #define DEBUG_POISON 0x00 // poison memory before freeing it if != 0 |
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26 | #define DEBUG_SALLOC 0 // add a debug wrapper around all sallocs |
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27 | #define PREFER_MALLOC 0 // use malloc and not the slice allocator |
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28 | |
4 | #if __GNUC__ >= 3 |
29 | #if __GNUC__ >= 3 |
5 | # define is_constant(c) __builtin_constant_p (c) |
30 | # define is_constant(c) __builtin_constant_p (c) |
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31 | # define expect(expr,value) __builtin_expect ((expr),(value)) |
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32 | # define prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) |
6 | #else |
33 | #else |
7 | # define is_constant(c) 0 |
34 | # define is_constant(c) 0 |
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35 | # define expect(expr,value) (expr) |
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36 | # define prefetch(addr,rw,locality) |
8 | #endif |
37 | #endif |
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38 | |
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39 | #if __GNUC__ < 4 || (__GNUC__ == 4 || __GNUC_MINOR__ < 4) |
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40 | # define decltype(x) typeof(x) |
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41 | #endif |
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42 | |
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43 | // put into ifs if you are very sure that the expression |
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44 | // is mostly true or mosty false. note that these return |
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45 | // booleans, not the expression. |
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46 | #define expect_false(expr) expect ((expr) != 0, 0) |
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47 | #define expect_true(expr) expect ((expr) != 0, 1) |
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48 | |
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49 | #include <pthread.h> |
9 | |
50 | |
10 | #include <cstddef> |
51 | #include <cstddef> |
11 | #include <cmath> |
52 | #include <cmath> |
12 | #include <new> |
53 | #include <new> |
13 | #include <vector> |
54 | #include <vector> |
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15 | #include <glib.h> |
56 | #include <glib.h> |
16 | |
57 | |
17 | #include <shstr.h> |
58 | #include <shstr.h> |
18 | #include <traits.h> |
59 | #include <traits.h> |
19 | |
60 | |
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61 | #if DEBUG_SALLOC |
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62 | # define g_slice_alloc0(s) debug_slice_alloc0(s) |
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63 | # define g_slice_alloc(s) debug_slice_alloc(s) |
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64 | # define g_slice_free1(s,p) debug_slice_free1(s,p) |
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65 | void *g_slice_alloc (unsigned long size); |
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66 | void *g_slice_alloc0 (unsigned long size); |
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67 | void g_slice_free1 (unsigned long size, void *ptr); |
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68 | #elif PREFER_MALLOC |
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69 | # define g_slice_alloc0(s) calloc (1, (s)) |
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70 | # define g_slice_alloc(s) malloc ((s)) |
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71 | # define g_slice_free1(s,p) free ((p)) |
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72 | #endif |
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73 | |
20 | // use a gcc extension for auto declarations until ISO C++ sanctifies them |
74 | // use C0X decltype for auto declarations until ISO C++ sanctifies them (if ever) |
21 | #define AUTODECL(var,expr) typeof(expr) var = (expr) |
75 | #define auto(var,expr) decltype(expr) var = (expr) |
22 | |
76 | |
23 | // very ugly macro that basicaly declares and initialises a variable |
77 | // very ugly macro that basically declares and initialises a variable |
24 | // that is in scope for the next statement only |
78 | // that is in scope for the next statement only |
25 | // works only for stuff that can be assigned 0 and converts to false |
79 | // works only for stuff that can be assigned 0 and converts to false |
26 | // (note: works great for pointers) |
80 | // (note: works great for pointers) |
27 | // most ugly macro I ever wrote |
81 | // most ugly macro I ever wrote |
28 | #define declvar(type, name, value) if (type name = 0) { } else if (((name) = (value)), 1) |
82 | #define statementvar(type, name, value) if (type name = 0) { } else if (((name) = (value)), 1) |
29 | |
83 | |
30 | // in range including end |
84 | // in range including end |
31 | #define IN_RANGE_INC(val,beg,end) \ |
85 | #define IN_RANGE_INC(val,beg,end) \ |
32 | ((unsigned int)(val) - (unsigned int)(beg) <= (unsigned int)(end) - (unsigned int)(beg)) |
86 | ((unsigned int)(val) - (unsigned int)(beg) <= (unsigned int)(end) - (unsigned int)(beg)) |
33 | |
87 | |
34 | // in range excluding end |
88 | // in range excluding end |
35 | #define IN_RANGE_EXC(val,beg,end) \ |
89 | #define IN_RANGE_EXC(val,beg,end) \ |
36 | ((unsigned int)(val) - (unsigned int)(beg) < (unsigned int)(end) - (unsigned int)(beg)) |
90 | ((unsigned int)(val) - (unsigned int)(beg) < (unsigned int)(end) - (unsigned int)(beg)) |
37 | |
91 | |
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92 | void cleanup (const char *cause, bool make_core = false); |
38 | void fork_abort (const char *msg); |
93 | void fork_abort (const char *msg); |
39 | |
94 | |
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95 | // rationale for using (U) not (T) is to reduce signed/unsigned issues, |
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96 | // as a is often a constant while b is the variable. it is still a bug, though. |
40 | template<typename T, typename U> static inline T min (T a, U b) { return a < (T)b ? a : (T)b; } |
97 | template<typename T, typename U> static inline T min (T a, U b) { return (U)a < b ? (U)a : b; } |
41 | template<typename T, typename U> static inline T max (T a, U b) { return a > (T)b ? a : (T)b; } |
98 | template<typename T, typename U> static inline T max (T a, U b) { return (U)a > b ? (U)a : b; } |
42 | 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; } |
99 | 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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100 | |
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101 | template<typename T, typename U> static inline void min_it (T &v, U m) { v = min (v, (T)m); } |
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102 | template<typename T, typename U> static inline void max_it (T &v, U m) { v = max (v, (T)m); } |
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103 | template<typename T, typename U, typename V> static inline void clamp_it (T &v, U a, V b) { v = clamp (v, (T)a, (T)b); } |
43 | |
104 | |
44 | template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; } |
105 | 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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106 | |
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107 | template<typename T, typename U, typename V> static inline T min (T a, U b, V c) { return min (a, min (b, c)); } |
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108 | template<typename T, typename U, typename V> static inline T max (T a, U b, V c) { return max (a, max (b, c)); } |
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109 | |
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110 | // sign returns -1 or +1 |
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111 | template<typename T> |
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112 | static inline T sign (T v) { return v < 0 ? -1 : +1; } |
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113 | // relies on 2c representation |
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114 | template<> |
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115 | inline sint8 sign (sint8 v) { return 1 - (sint8 (uint8 (v) >> 7) * 2); } |
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116 | |
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117 | // sign0 returns -1, 0 or +1 |
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118 | template<typename T> |
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119 | static inline T sign0 (T v) { return v ? sign (v) : 0; } |
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120 | |
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121 | // div, with correct rounding (< 0.5 downwards, >=0.5 upwards) |
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122 | template<typename T> static inline T div (T val, T div) { return (val + div / 2) / div; } |
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123 | // div, round-up |
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124 | template<typename T> static inline T div_ru (T val, T div) { return (val + div - 1) / div; } |
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125 | // div, round-down |
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126 | template<typename T> static inline T div_rd (T val, T div) { return (val ) / div; } |
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127 | |
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128 | template<typename T> |
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129 | static inline T |
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130 | lerp (T val, T min_in, T max_in, T min_out, T max_out) |
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131 | { |
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132 | return min_out + div <T> ((val - min_in) * (max_out - min_out), max_in - min_in); |
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133 | } |
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134 | |
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135 | // lerp, round-down |
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136 | template<typename T> |
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137 | static inline T |
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138 | lerp_rd (T val, T min_in, T max_in, T min_out, T max_out) |
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139 | { |
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140 | return min_out + div_rd<T> ((val - min_in) * (max_out - min_out), max_in - min_in); |
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141 | } |
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142 | |
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143 | // lerp, round-up |
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144 | template<typename T> |
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145 | static inline T |
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146 | lerp_ru (T val, T min_in, T max_in, T min_out, T max_out) |
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147 | { |
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148 | return min_out + div_ru<T> ((val - min_in) * (max_out - min_out), max_in - min_in); |
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149 | } |
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150 | |
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151 | // lots of stuff taken from FXT |
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152 | |
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153 | /* Rotate right. This is used in various places for checksumming */ |
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154 | //TODO: that sucks, use a better checksum algo |
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155 | static inline uint32_t |
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156 | rotate_right (uint32_t c, uint32_t count = 1) |
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157 | { |
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158 | return (c << (32 - count)) | (c >> count); |
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159 | } |
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160 | |
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161 | static inline uint32_t |
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162 | rotate_left (uint32_t c, uint32_t count = 1) |
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163 | { |
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164 | return (c >> (32 - count)) | (c << count); |
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165 | } |
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166 | |
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167 | // Return abs(a-b) |
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168 | // Both a and b must not have the most significant bit set |
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169 | static inline uint32_t |
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170 | upos_abs_diff (uint32_t a, uint32_t b) |
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171 | { |
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172 | long d1 = b - a; |
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173 | long d2 = (d1 & (d1 >> 31)) << 1; |
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174 | |
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175 | return d1 - d2; // == (b - d) - (a + d); |
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176 | } |
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177 | |
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178 | // Both a and b must not have the most significant bit set |
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179 | static inline uint32_t |
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180 | upos_min (uint32_t a, uint32_t b) |
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181 | { |
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182 | int32_t d = b - a; |
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183 | d &= d >> 31; |
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184 | return a + d; |
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185 | } |
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186 | |
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187 | // Both a and b must not have the most significant bit set |
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188 | static inline uint32_t |
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189 | upos_max (uint32_t a, uint32_t b) |
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190 | { |
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191 | int32_t d = b - a; |
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192 | d &= d >> 31; |
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193 | return b - d; |
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194 | } |
45 | |
195 | |
46 | // this is much faster than crossfires original algorithm |
196 | // this is much faster than crossfires original algorithm |
47 | // on modern cpus |
197 | // on modern cpus |
48 | inline int |
198 | inline int |
49 | isqrt (int n) |
199 | isqrt (int n) |
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81 | absdir (int d) |
231 | absdir (int d) |
82 | { |
232 | { |
83 | return ((d - 1) & 7) + 1; |
233 | return ((d - 1) & 7) + 1; |
84 | } |
234 | } |
85 | |
235 | |
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236 | extern ssize_t slice_alloc; // statistics |
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237 | |
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238 | void *salloc_ (int n) throw (std::bad_alloc); |
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239 | void *salloc_ (int n, void *src) throw (std::bad_alloc); |
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240 | |
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241 | // strictly the same as g_slice_alloc, but never returns 0 |
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242 | template<typename T> |
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243 | inline T *salloc (int n = 1) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T)); } |
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244 | |
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245 | // also copies src into the new area, like "memdup" |
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246 | // if src is 0, clears the memory |
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247 | template<typename T> |
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248 | inline T *salloc (int n, T *src) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T), (void *)src); } |
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249 | |
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250 | // clears the memory |
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251 | template<typename T> |
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252 | inline T *salloc0(int n = 1) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T), 0); } |
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253 | |
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254 | // for symmetry |
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255 | template<typename T> |
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256 | inline void sfree (T *ptr, int n = 1) throw () |
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257 | { |
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258 | if (expect_true (ptr)) |
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259 | { |
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260 | slice_alloc -= n * sizeof (T); |
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261 | if (DEBUG_POISON) memset (ptr, DEBUG_POISON, n * sizeof (T)); |
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262 | g_slice_free1 (n * sizeof (T), (void *)ptr); |
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263 | assert (slice_alloc >= 0);//D |
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264 | } |
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265 | } |
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266 | |
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267 | // nulls the pointer |
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268 | template<typename T> |
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269 | inline void sfree0 (T *&ptr, int n = 1) throw () |
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270 | { |
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271 | sfree<T> (ptr, n); |
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272 | ptr = 0; |
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273 | } |
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274 | |
86 | // makes dynamically allocated objects zero-initialised |
275 | // makes dynamically allocated objects zero-initialised |
87 | struct zero_initialised |
276 | struct zero_initialised |
88 | { |
277 | { |
89 | void *operator new (size_t s, void *p) |
278 | void *operator new (size_t s, void *p) |
90 | { |
279 | { |
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92 | return p; |
281 | return p; |
93 | } |
282 | } |
94 | |
283 | |
95 | void *operator new (size_t s) |
284 | void *operator new (size_t s) |
96 | { |
285 | { |
97 | return g_slice_alloc0 (s); |
286 | return salloc0<char> (s); |
98 | } |
287 | } |
99 | |
288 | |
100 | void *operator new[] (size_t s) |
289 | void *operator new[] (size_t s) |
101 | { |
290 | { |
102 | return g_slice_alloc0 (s); |
291 | return salloc0<char> (s); |
103 | } |
292 | } |
104 | |
293 | |
105 | void operator delete (void *p, size_t s) |
294 | void operator delete (void *p, size_t s) |
106 | { |
295 | { |
107 | g_slice_free1 (s, p); |
296 | sfree ((char *)p, s); |
108 | } |
297 | } |
109 | |
298 | |
110 | void operator delete[] (void *p, size_t s) |
299 | void operator delete[] (void *p, size_t s) |
111 | { |
300 | { |
112 | g_slice_free1 (s, p); |
301 | sfree ((char *)p, s); |
113 | } |
302 | } |
114 | }; |
303 | }; |
115 | |
304 | |
116 | void *salloc_ (int n) throw (std::bad_alloc); |
305 | // makes dynamically allocated objects zero-initialised |
117 | void *salloc_ (int n, void *src) throw (std::bad_alloc); |
306 | struct slice_allocated |
118 | |
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119 | // strictly the same as g_slice_alloc, but never returns 0 |
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120 | template<typename T> |
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121 | inline T *salloc (int n = 1) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T)); } |
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122 | |
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123 | // also copies src into the new area, like "memdup" |
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124 | // if src is 0, clears the memory |
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125 | template<typename T> |
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126 | inline T *salloc (int n, T *src) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T), (void *)src); } |
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127 | |
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128 | // clears the memory |
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129 | template<typename T> |
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130 | inline T *salloc0(int n = 1) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T), 0); } |
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131 | |
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132 | // for symmetry |
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133 | template<typename T> |
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134 | inline void sfree (T *ptr, int n = 1) throw () |
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135 | { |
307 | { |
136 | g_slice_free1 (n * sizeof (T), (void *)ptr); |
308 | void *operator new (size_t s, void *p) |
137 | } |
309 | { |
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310 | return p; |
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311 | } |
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312 | |
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313 | void *operator new (size_t s) |
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314 | { |
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315 | return salloc<char> (s); |
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316 | } |
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317 | |
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318 | void *operator new[] (size_t s) |
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319 | { |
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320 | return salloc<char> (s); |
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321 | } |
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322 | |
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323 | void operator delete (void *p, size_t s) |
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324 | { |
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325 | sfree ((char *)p, s); |
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326 | } |
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327 | |
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328 | void operator delete[] (void *p, size_t s) |
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329 | { |
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330 | sfree ((char *)p, s); |
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331 | } |
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332 | }; |
138 | |
333 | |
139 | // a STL-compatible allocator that uses g_slice |
334 | // a STL-compatible allocator that uses g_slice |
140 | // boy, this is verbose |
335 | // boy, this is verbose |
141 | template<typename Tp> |
336 | template<typename Tp> |
142 | struct slice_allocator |
337 | struct slice_allocator |
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154 | { |
349 | { |
155 | typedef slice_allocator<U> other; |
350 | typedef slice_allocator<U> other; |
156 | }; |
351 | }; |
157 | |
352 | |
158 | slice_allocator () throw () { } |
353 | slice_allocator () throw () { } |
159 | slice_allocator (const slice_allocator &o) throw () { } |
354 | slice_allocator (const slice_allocator &) throw () { } |
160 | template<typename Tp2> |
355 | template<typename Tp2> |
161 | slice_allocator (const slice_allocator<Tp2> &) throw () { } |
356 | slice_allocator (const slice_allocator<Tp2> &) throw () { } |
162 | |
357 | |
163 | ~slice_allocator () { } |
358 | ~slice_allocator () { } |
164 | |
359 | |
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173 | void deallocate (pointer p, size_type n) |
368 | void deallocate (pointer p, size_type n) |
174 | { |
369 | { |
175 | sfree<Tp> (p, n); |
370 | sfree<Tp> (p, n); |
176 | } |
371 | } |
177 | |
372 | |
178 | size_type max_size ()const throw () |
373 | size_type max_size () const throw () |
179 | { |
374 | { |
180 | return size_t (-1) / sizeof (Tp); |
375 | return size_t (-1) / sizeof (Tp); |
181 | } |
376 | } |
182 | |
377 | |
183 | void construct (pointer p, const Tp &val) |
378 | void construct (pointer p, const Tp &val) |
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194 | // P. L'Ecuyer, “Maximally Equidistributed Combined Tausworthe Generators”, Mathematics of Computation, 65, 213 (1996), 203–213. |
389 | // P. L'Ecuyer, “Maximally Equidistributed Combined Tausworthe Generators”, Mathematics of Computation, 65, 213 (1996), 203–213. |
195 | // http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme.ps |
390 | // http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme.ps |
196 | // http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme2.ps |
391 | // http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme2.ps |
197 | struct tausworthe_random_generator |
392 | struct tausworthe_random_generator |
198 | { |
393 | { |
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394 | // generator |
199 | uint32_t state [4]; |
395 | uint32_t state [4]; |
200 | |
396 | |
201 | tausworthe_random_generator (uint32_t seed); |
397 | void operator =(const tausworthe_random_generator &src) |
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398 | { |
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399 | state [0] = src.state [0]; |
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400 | state [1] = src.state [1]; |
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401 | state [2] = src.state [2]; |
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402 | state [3] = src.state [3]; |
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403 | } |
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404 | |
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405 | void seed (uint32_t seed); |
202 | uint32_t next (); |
406 | uint32_t next (); |
203 | |
407 | |
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408 | // uniform distribution, 0 .. max (0, num - 1) |
204 | uint32_t operator ()(uint32_t r_max) |
409 | uint32_t operator ()(uint32_t num) |
205 | { |
410 | { |
206 | return next () % r_max; |
411 | return !is_constant (num) ? get_range (num) // non-constant |
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412 | : num & (num - 1) ? (next () * (uint64_t)num) >> 32U // constant, non-power-of-two |
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413 | : next () & (num - 1); // constant, power-of-two |
207 | } |
414 | } |
208 | |
415 | |
209 | // return a number within (min .. max) |
416 | // return a number within (min .. max) |
210 | int operator () (int r_min, int r_max) |
417 | int operator () (int r_min, int r_max) |
211 | { |
418 | { |
212 | return r_min + next () % max (r_max - r_min + 1, 1); |
419 | return is_constant (r_min) && is_constant (r_max) && r_min <= r_max |
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420 | ? r_min + operator ()(r_max - r_min + 1) |
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421 | : get_range (r_min, r_max); |
213 | } |
422 | } |
214 | |
423 | |
215 | double operator ()() |
424 | double operator ()() |
216 | { |
425 | { |
217 | return next () / (double)0xFFFFFFFFU; |
426 | return this->next () / (double)0xFFFFFFFFU; |
218 | } |
427 | } |
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428 | |
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429 | protected: |
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430 | uint32_t get_range (uint32_t r_max); |
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431 | int get_range (int r_min, int r_max); |
219 | }; |
432 | }; |
220 | |
433 | |
221 | typedef tausworthe_random_generator rand_gen; |
434 | typedef tausworthe_random_generator rand_gen; |
222 | |
435 | |
223 | extern rand_gen rndm; |
436 | extern rand_gen rndm, rmg_rndm; |
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437 | |
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438 | INTERFACE_CLASS (attachable) |
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439 | struct refcnt_base |
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440 | { |
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441 | typedef int refcnt_t; |
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442 | mutable refcnt_t ACC (RW, refcnt); |
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443 | |
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444 | MTH void refcnt_inc () const { ++refcnt; } |
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445 | MTH void refcnt_dec () const { --refcnt; } |
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446 | |
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447 | refcnt_base () : refcnt (0) { } |
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448 | }; |
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449 | |
|
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450 | // to avoid branches with more advanced compilers |
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451 | extern refcnt_base::refcnt_t refcnt_dummy; |
224 | |
452 | |
225 | template<class T> |
453 | template<class T> |
226 | struct refptr |
454 | struct refptr |
227 | { |
455 | { |
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456 | // p if not null |
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457 | refcnt_base::refcnt_t *refcnt_ref () { return p ? &p->refcnt : &refcnt_dummy; } |
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458 | |
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459 | void refcnt_dec () |
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460 | { |
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461 | if (!is_constant (p)) |
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462 | --*refcnt_ref (); |
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463 | else if (p) |
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464 | --p->refcnt; |
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465 | } |
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466 | |
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467 | void refcnt_inc () |
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468 | { |
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469 | if (!is_constant (p)) |
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470 | ++*refcnt_ref (); |
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471 | else if (p) |
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472 | ++p->refcnt; |
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473 | } |
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474 | |
228 | T *p; |
475 | T *p; |
229 | |
476 | |
230 | refptr () : p(0) { } |
477 | refptr () : p(0) { } |
231 | refptr (const refptr<T> &p) : p(p.p) { if (p) p->refcnt_inc (); } |
478 | refptr (const refptr<T> &p) : p(p.p) { refcnt_inc (); } |
232 | refptr (T *p) : p(p) { if (p) p->refcnt_inc (); } |
479 | refptr (T *p) : p(p) { refcnt_inc (); } |
233 | ~refptr () { if (p) p->refcnt_dec (); } |
480 | ~refptr () { refcnt_dec (); } |
234 | |
481 | |
235 | const refptr<T> &operator =(T *o) |
482 | const refptr<T> &operator =(T *o) |
236 | { |
483 | { |
|
|
484 | // if decrementing ever destroys we need to reverse the order here |
237 | if (p) p->refcnt_dec (); |
485 | refcnt_dec (); |
238 | p = o; |
486 | p = o; |
239 | if (p) p->refcnt_inc (); |
487 | refcnt_inc (); |
240 | |
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|
241 | return *this; |
488 | return *this; |
242 | } |
489 | } |
243 | |
490 | |
244 | const refptr<T> &operator =(const refptr<T> o) |
491 | const refptr<T> &operator =(const refptr<T> &o) |
245 | { |
492 | { |
246 | *this = o.p; |
493 | *this = o.p; |
247 | return *this; |
494 | return *this; |
248 | } |
495 | } |
249 | |
496 | |
250 | T &operator * () const { return *p; } |
497 | T &operator * () const { return *p; } |
251 | T *operator ->() const { return p; } |
498 | T *operator ->() const { return p; } |
252 | |
499 | |
253 | operator T *() const { return p; } |
500 | operator T *() const { return p; } |
254 | }; |
501 | }; |
255 | |
502 | |
256 | typedef refptr<maptile> maptile_ptr; |
503 | typedef refptr<maptile> maptile_ptr; |
… | |
… | |
291 | { |
538 | { |
292 | return !strcmp (a, b); |
539 | return !strcmp (a, b); |
293 | } |
540 | } |
294 | }; |
541 | }; |
295 | |
542 | |
|
|
543 | // Mostly the same as std::vector, but insert/erase can reorder |
|
|
544 | // the elements, making append(=insert)/remove O(1) instead of O(n). |
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|
545 | // |
|
|
546 | // NOTE: only some forms of erase are available |
296 | template<class T> |
547 | template<class T> |
297 | struct unordered_vector : std::vector<T, slice_allocator<T> > |
548 | struct unordered_vector : std::vector<T, slice_allocator<T> > |
298 | { |
549 | { |
299 | typedef typename unordered_vector::iterator iterator; |
550 | typedef typename unordered_vector::iterator iterator; |
300 | |
551 | |
… | |
… | |
310 | { |
561 | { |
311 | erase ((unsigned int )(i - this->begin ())); |
562 | erase ((unsigned int )(i - this->begin ())); |
312 | } |
563 | } |
313 | }; |
564 | }; |
314 | |
565 | |
315 | template<class T, int T::* index> |
566 | // This container blends advantages of linked lists |
|
|
567 | // (efficiency) with vectors (random access) by |
|
|
568 | // by using an unordered vector and storing the vector |
|
|
569 | // index inside the object. |
|
|
570 | // |
|
|
571 | // + memory-efficient on most 64 bit archs |
|
|
572 | // + O(1) insert/remove |
|
|
573 | // + free unique (but varying) id for inserted objects |
|
|
574 | // + cache-friendly iteration |
|
|
575 | // - only works for pointers to structs |
|
|
576 | // |
|
|
577 | // NOTE: only some forms of erase/insert are available |
|
|
578 | typedef int object_vector_index; |
|
|
579 | |
|
|
580 | template<class T, object_vector_index T::*indexmember> |
316 | struct object_vector : std::vector<T *, slice_allocator<T *> > |
581 | struct object_vector : std::vector<T *, slice_allocator<T *> > |
317 | { |
582 | { |
|
|
583 | typedef typename object_vector::iterator iterator; |
|
|
584 | |
|
|
585 | bool contains (const T *obj) const |
|
|
586 | { |
|
|
587 | return obj->*indexmember; |
|
|
588 | } |
|
|
589 | |
|
|
590 | iterator find (const T *obj) |
|
|
591 | { |
|
|
592 | return obj->*indexmember |
|
|
593 | ? this->begin () + obj->*indexmember - 1 |
|
|
594 | : this->end (); |
|
|
595 | } |
|
|
596 | |
|
|
597 | void push_back (T *obj) |
|
|
598 | { |
|
|
599 | std::vector<T *, slice_allocator<T *> >::push_back (obj); |
|
|
600 | obj->*indexmember = this->size (); |
|
|
601 | } |
|
|
602 | |
318 | void insert (T *obj) |
603 | void insert (T *obj) |
319 | { |
604 | { |
320 | assert (!(obj->*index)); |
|
|
321 | push_back (obj); |
605 | push_back (obj); |
322 | obj->*index = this->size (); |
|
|
323 | } |
606 | } |
324 | |
607 | |
325 | void insert (T &obj) |
608 | void insert (T &obj) |
326 | { |
609 | { |
327 | insert (&obj); |
610 | insert (&obj); |
328 | } |
611 | } |
329 | |
612 | |
330 | void erase (T *obj) |
613 | void erase (T *obj) |
331 | { |
614 | { |
332 | assert (obj->*index); |
|
|
333 | int pos = obj->*index; |
615 | unsigned int pos = obj->*indexmember; |
334 | obj->*index = 0; |
616 | obj->*indexmember = 0; |
335 | |
617 | |
336 | if (pos < this->size ()) |
618 | if (pos < this->size ()) |
337 | { |
619 | { |
338 | (*this)[pos - 1] = (*this)[this->size () - 1]; |
620 | (*this)[pos - 1] = (*this)[this->size () - 1]; |
339 | (*this)[pos - 1]->*index = pos; |
621 | (*this)[pos - 1]->*indexmember = pos; |
340 | } |
622 | } |
341 | |
623 | |
342 | this->pop_back (); |
624 | this->pop_back (); |
343 | } |
625 | } |
344 | |
626 | |
345 | void erase (T &obj) |
627 | void erase (T &obj) |
346 | { |
628 | { |
347 | errase (&obj); |
629 | erase (&obj); |
348 | } |
630 | } |
349 | }; |
631 | }; |
350 | |
632 | |
351 | // basically does what strncpy should do, but appends "..." to strings exceeding length |
633 | // basically does what strncpy should do, but appends "..." to strings exceeding length |
352 | void assign (char *dst, const char *src, int maxlen); |
634 | void assign (char *dst, const char *src, int maxlen); |
… | |
… | |
358 | assign ((char *)&dst, src, N); |
640 | assign ((char *)&dst, src, N); |
359 | } |
641 | } |
360 | |
642 | |
361 | typedef double tstamp; |
643 | typedef double tstamp; |
362 | |
644 | |
363 | // return current time as timestampe |
645 | // return current time as timestamp |
364 | tstamp now (); |
646 | tstamp now (); |
365 | |
647 | |
366 | int similar_direction (int a, int b); |
648 | int similar_direction (int a, int b); |
367 | |
649 | |
|
|
650 | // like sprintf, but returns a "static" buffer |
|
|
651 | const char *format (const char *format, ...); |
|
|
652 | |
|
|
653 | ///////////////////////////////////////////////////////////////////////////// |
|
|
654 | // threads, very very thin wrappers around pthreads |
|
|
655 | |
|
|
656 | struct thread |
|
|
657 | { |
|
|
658 | pthread_t id; |
|
|
659 | |
|
|
660 | void start (void *(*start_routine)(void *), void *arg = 0); |
|
|
661 | |
|
|
662 | void cancel () |
|
|
663 | { |
|
|
664 | pthread_cancel (id); |
|
|
665 | } |
|
|
666 | |
|
|
667 | void *join () |
|
|
668 | { |
|
|
669 | void *ret; |
|
|
670 | |
|
|
671 | if (pthread_join (id, &ret)) |
|
|
672 | cleanup ("pthread_join failed", 1); |
|
|
673 | |
|
|
674 | return ret; |
|
|
675 | } |
|
|
676 | }; |
|
|
677 | |
|
|
678 | // note that mutexes are not classes |
|
|
679 | typedef pthread_mutex_t smutex; |
|
|
680 | |
|
|
681 | #if __linux && defined (PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP) |
|
|
682 | #define SMUTEX_INITIALISER PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP |
|
|
683 | #else |
|
|
684 | #define SMUTEX_INITIALISER PTHREAD_MUTEX_INITIALIZER |
368 | #endif |
685 | #endif |
369 | |
686 | |
|
|
687 | #define SMUTEX(name) smutex name = SMUTEX_INITIALISER |
|
|
688 | #define SMUTEX_LOCK(name) pthread_mutex_lock (&(name)) |
|
|
689 | #define SMUTEX_UNLOCK(name) pthread_mutex_unlock (&(name)) |
|
|
690 | |
|
|
691 | typedef pthread_cond_t scond; |
|
|
692 | |
|
|
693 | #define SCOND(name) scond name = PTHREAD_COND_INITIALIZER |
|
|
694 | #define SCOND_SIGNAL(name) pthread_cond_signal (&(name)) |
|
|
695 | #define SCOND_BROADCAST(name) pthread_cond_broadcast (&(name)) |
|
|
696 | #define SCOND_WAIT(name,mutex) pthread_cond_wait (&(name), &(mutex)) |
|
|
697 | |
|
|
698 | #endif |
|
|
699 | |