1 | /* |
1 | /* |
2 | * This file is part of Deliantra, the Roguelike Realtime MMORPG. |
2 | * This file is part of Deliantra, the Roguelike Realtime MMORPG. |
3 | * |
3 | * |
4 | * Copyright (©) 2005,2006,2007 Marc Alexander Lehmann / Robin Redeker / the Deliantra team |
4 | * Copyright (©) 2005,2006,2007,2008,2009,2010 Marc Alexander Lehmann / Robin Redeker / the Deliantra team |
5 | * |
5 | * |
6 | * Deliantra is free software: you can redistribute it and/or modify |
6 | * Deliantra is free software: you can redistribute it and/or modify it under |
7 | * it under the terms of the GNU General Public License as published by |
7 | * the terms of the Affero GNU General Public License as published by the |
8 | * the Free Software Foundation, either version 3 of the License, or |
8 | * Free Software Foundation, either version 3 of the License, or (at your |
9 | * (at your option) any later version. |
9 | * option) any later version. |
10 | * |
10 | * |
11 | * This program is distributed in the hope that it will be useful, |
11 | * This program is distributed in the hope that it will be useful, |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | * GNU General Public License for more details. |
14 | * GNU General Public License for more details. |
15 | * |
15 | * |
16 | * You should have received a copy of the GNU General Public License |
16 | * You should have received a copy of the Affero GNU General Public License |
17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
17 | * and the GNU General Public License along with this program. If not, see |
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18 | * <http://www.gnu.org/licenses/>. |
18 | * |
19 | * |
19 | * The authors can be reached via e-mail to <support@deliantra.net> |
20 | * The authors can be reached via e-mail to <support@deliantra.net> |
20 | */ |
21 | */ |
21 | |
22 | |
22 | #ifndef UTIL_H__ |
23 | #ifndef UTIL_H__ |
23 | #define UTIL_H__ |
24 | #define UTIL_H__ |
24 | |
25 | |
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26 | #include <compiler.h> |
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27 | |
25 | #define DEBUG_POISON 0xaa // poison memory before freeing it if != 0 |
28 | #define DEBUG_POISON 0x00 // poison memory before freeing it if != 0 |
26 | #define DEBUG_SALLOC 0 // add a debug wrapper around all sallocs |
29 | #define DEBUG_SALLOC 0 // add a debug wrapper around all sallocs |
27 | #define PREFER_MALLOC 0 // use malloc and not the slice allocator |
30 | #define PREFER_MALLOC 0 // use malloc and not the slice allocator |
28 | |
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29 | #if __GNUC__ >= 3 |
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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) |
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33 | #else |
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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) |
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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 | |
31 | |
49 | #include <pthread.h> |
32 | #include <pthread.h> |
50 | |
33 | |
51 | #include <cstddef> |
34 | #include <cstddef> |
52 | #include <cmath> |
35 | #include <cmath> |
… | |
… | |
72 | #endif |
55 | #endif |
73 | |
56 | |
74 | // use C0X decltype for auto declarations until ISO C++ sanctifies them (if ever) |
57 | // use C0X decltype for auto declarations until ISO C++ sanctifies them (if ever) |
75 | #define auto(var,expr) decltype(expr) var = (expr) |
58 | #define auto(var,expr) decltype(expr) var = (expr) |
76 | |
59 | |
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60 | #if cplusplus_does_not_suck |
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61 | // does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) |
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62 | template<typename T, int N> |
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63 | static inline int array_length (const T (&arr)[N]) |
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64 | { |
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65 | return N; |
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66 | } |
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67 | #else |
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68 | #define array_length(name) (sizeof (name) / sizeof (name [0])) |
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69 | #endif |
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70 | |
77 | // very ugly macro that basicaly declares and initialises a variable |
71 | // very ugly macro that basically declares and initialises a variable |
78 | // that is in scope for the next statement only |
72 | // that is in scope for the next statement only |
79 | // works only for stuff that can be assigned 0 and converts to false |
73 | // works only for stuff that can be assigned 0 and converts to false |
80 | // (note: works great for pointers) |
74 | // (note: works great for pointers) |
81 | // most ugly macro I ever wrote |
75 | // most ugly macro I ever wrote |
82 | #define statementvar(type, name, value) if (type name = 0) { } else if (((name) = (value)), 1) |
76 | #define statementvar(type, name, value) if (type name = 0) { } else if (((name) = (value)), 1) |
… | |
… | |
96 | // as a is often a constant while b is the variable. it is still a bug, though. |
90 | // as a is often a constant while b is the variable. it is still a bug, though. |
97 | template<typename T, typename U> static inline T min (T a, U b) { return (U)a < b ? (U)a : b; } |
91 | template<typename T, typename U> static inline T min (T a, U b) { return (U)a < b ? (U)a : b; } |
98 | template<typename T, typename U> static inline T max (T a, U b) { return (U)a > b ? (U)a : b; } |
92 | template<typename T, typename U> static inline T max (T a, U b) { return (U)a > b ? (U)a : b; } |
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; } |
93 | 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; } |
100 | |
94 | |
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95 | template<typename T, typename U> static inline void min_it (T &v, U m) { v = min (v, (T)m); } |
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96 | template<typename T, typename U> static inline void max_it (T &v, U m) { v = max (v, (T)m); } |
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97 | 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); } |
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98 | |
101 | template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; } |
99 | template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; } |
102 | |
100 | |
103 | template<typename T, typename U, typename V> static inline T min (T a, U b, V c) { return min (a, min (b, c)); } |
101 | template<typename T, typename U, typename V> static inline T min (T a, U b, V c) { return min (a, min (b, c)); } |
104 | template<typename T, typename U, typename V> static inline T max (T a, U b, V c) { return max (a, max (b, c)); } |
102 | template<typename T, typename U, typename V> static inline T max (T a, U b, V c) { return max (a, max (b, c)); } |
105 | |
103 | |
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104 | // sign returns -1 or +1 |
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105 | template<typename T> |
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106 | static inline T sign (T v) { return v < 0 ? -1 : +1; } |
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107 | // relies on 2c representation |
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108 | template<> |
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109 | inline sint8 sign (sint8 v) { return 1 - (sint8 (uint8 (v) >> 7) * 2); } |
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110 | template<> |
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111 | inline sint16 sign (sint16 v) { return 1 - (sint16 (uint16 (v) >> 15) * 2); } |
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112 | template<> |
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113 | inline sint32 sign (sint32 v) { return 1 - (sint32 (uint32 (v) >> 31) * 2); } |
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114 | |
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115 | // sign0 returns -1, 0 or +1 |
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116 | template<typename T> |
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117 | static inline T sign0 (T v) { return v ? sign (v) : 0; } |
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118 | |
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119 | template<typename T, typename U> |
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120 | static inline T copysign (T a, U b) { return a > 0 ? b : -b; } |
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121 | |
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122 | // div* only work correctly for div > 0 |
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123 | // div, with correct rounding (< 0.5 downwards, >=0.5 upwards) |
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124 | template<typename T> static inline T div (T val, T div) |
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125 | { |
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126 | return expect_false (val < 0) ? - ((-val + (div - 1) / 2) / div) : (val + div / 2) / div; |
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127 | } |
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128 | |
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129 | template<> inline float div (float val, float div) { return val / div; } |
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130 | template<> inline double div (double val, double div) { return val / div; } |
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131 | |
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132 | // div, round-up |
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133 | template<typename T> static inline T div_ru (T val, T div) |
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134 | { |
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135 | return expect_false (val < 0) ? - ((-val ) / div) : (val + div - 1) / div; |
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136 | } |
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137 | // div, round-down |
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138 | template<typename T> static inline T div_rd (T val, T div) |
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139 | { |
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140 | return expect_false (val < 0) ? - ((-val + (div - 1) ) / div) : (val ) / div; |
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141 | } |
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142 | |
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143 | // lerp* only work correctly for min_in < max_in |
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144 | // Linear intERPolate, scales val from min_in..max_in to min_out..max_out |
106 | template<typename T> |
145 | template<typename T> |
107 | static inline T |
146 | static inline T |
108 | lerp (T val, T min_in, T max_in, T min_out, T max_out) |
147 | lerp (T val, T min_in, T max_in, T min_out, T max_out) |
109 | { |
148 | { |
110 | return (val - min_in) * (max_out - min_out) / (max_in - min_in) + min_out; |
149 | return min_out + div <T> ((val - min_in) * (max_out - min_out), max_in - min_in); |
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150 | } |
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151 | |
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152 | // lerp, round-down |
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153 | template<typename T> |
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154 | static inline T |
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155 | lerp_rd (T val, T min_in, T max_in, T min_out, T max_out) |
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156 | { |
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157 | return min_out + div_rd<T> ((val - min_in) * (max_out - min_out), max_in - min_in); |
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158 | } |
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159 | |
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160 | // lerp, round-up |
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161 | template<typename T> |
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162 | static inline T |
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163 | lerp_ru (T val, T min_in, T max_in, T min_out, T max_out) |
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164 | { |
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165 | return min_out + div_ru<T> ((val - min_in) * (max_out - min_out), max_in - min_in); |
111 | } |
166 | } |
112 | |
167 | |
113 | // lots of stuff taken from FXT |
168 | // lots of stuff taken from FXT |
114 | |
169 | |
115 | /* Rotate right. This is used in various places for checksumming */ |
170 | /* Rotate right. This is used in various places for checksumming */ |
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153 | int32_t d = b - a; |
208 | int32_t d = b - a; |
154 | d &= d >> 31; |
209 | d &= d >> 31; |
155 | return b - d; |
210 | return b - d; |
156 | } |
211 | } |
157 | |
212 | |
158 | // this is much faster than crossfires original algorithm |
213 | // this is much faster than crossfire's original algorithm |
159 | // on modern cpus |
214 | // on modern cpus |
160 | inline int |
215 | inline int |
161 | isqrt (int n) |
216 | isqrt (int n) |
162 | { |
217 | { |
163 | return (int)sqrtf ((float)n); |
218 | return (int)sqrtf ((float)n); |
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219 | } |
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220 | |
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221 | // this is kind of like the ^^ operator, if it would exist, without sequence point. |
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222 | // more handy than it looks like, due to the implicit !! done on its arguments |
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223 | inline bool |
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224 | logical_xor (bool a, bool b) |
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225 | { |
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226 | return a != b; |
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227 | } |
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228 | |
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229 | inline bool |
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230 | logical_implies (bool a, bool b) |
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231 | { |
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232 | return a <= b; |
164 | } |
233 | } |
165 | |
234 | |
166 | // this is only twice as fast as naive sqrtf (dx*dy+dy*dy) |
235 | // this is only twice as fast as naive sqrtf (dx*dy+dy*dy) |
167 | #if 0 |
236 | #if 0 |
168 | // and has a max. error of 6 in the range -100..+100. |
237 | // and has a max. error of 6 in the range -100..+100. |
… | |
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193 | absdir (int d) |
262 | absdir (int d) |
194 | { |
263 | { |
195 | return ((d - 1) & 7) + 1; |
264 | return ((d - 1) & 7) + 1; |
196 | } |
265 | } |
197 | |
266 | |
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267 | // avoid ctz name because netbsd or freebsd spams it's namespace with it |
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268 | #if GCC_VERSION(3,4) |
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269 | static inline int least_significant_bit (uint32_t x) |
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270 | { |
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271 | return __builtin_ctz (x); |
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272 | } |
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273 | #else |
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274 | int least_significant_bit (uint32_t x); |
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275 | #endif |
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276 | |
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277 | #define for_all_bits_sparse_32(mask, idxvar) \ |
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278 | for (uint32_t idxvar, mask_ = mask; \ |
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279 | mask_ && ((idxvar = least_significant_bit (mask_)), mask_ &= ~(1 << idxvar), 1);) |
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280 | |
198 | extern ssize_t slice_alloc; // statistics |
281 | extern ssize_t slice_alloc; // statistics |
199 | |
282 | |
200 | void *salloc_ (int n) throw (std::bad_alloc); |
283 | void *salloc_ (int n) throw (std::bad_alloc); |
201 | void *salloc_ (int n, void *src) throw (std::bad_alloc); |
284 | void *salloc_ (int n, void *src) throw (std::bad_alloc); |
202 | |
285 | |
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224 | g_slice_free1 (n * sizeof (T), (void *)ptr); |
307 | g_slice_free1 (n * sizeof (T), (void *)ptr); |
225 | assert (slice_alloc >= 0);//D |
308 | assert (slice_alloc >= 0);//D |
226 | } |
309 | } |
227 | } |
310 | } |
228 | |
311 | |
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312 | // nulls the pointer |
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313 | template<typename T> |
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314 | inline void sfree0 (T *&ptr, int n = 1) throw () |
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315 | { |
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316 | sfree<T> (ptr, n); |
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317 | ptr = 0; |
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318 | } |
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319 | |
229 | // makes dynamically allocated objects zero-initialised |
320 | // makes dynamically allocated objects zero-initialised |
230 | struct zero_initialised |
321 | struct zero_initialised |
231 | { |
322 | { |
232 | void *operator new (size_t s, void *p) |
323 | void *operator new (size_t s, void *p) |
233 | { |
324 | { |
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241 | } |
332 | } |
242 | |
333 | |
243 | void *operator new[] (size_t s) |
334 | void *operator new[] (size_t s) |
244 | { |
335 | { |
245 | return salloc0<char> (s); |
336 | return salloc0<char> (s); |
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337 | } |
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338 | |
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339 | void operator delete (void *p, size_t s) |
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340 | { |
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341 | sfree ((char *)p, s); |
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342 | } |
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343 | |
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344 | void operator delete[] (void *p, size_t s) |
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345 | { |
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346 | sfree ((char *)p, s); |
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347 | } |
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348 | }; |
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349 | |
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350 | // makes dynamically allocated objects zero-initialised |
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351 | struct slice_allocated |
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352 | { |
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353 | void *operator new (size_t s, void *p) |
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354 | { |
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355 | return p; |
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356 | } |
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357 | |
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358 | void *operator new (size_t s) |
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359 | { |
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360 | return salloc<char> (s); |
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361 | } |
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362 | |
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363 | void *operator new[] (size_t s) |
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364 | { |
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365 | return salloc<char> (s); |
246 | } |
366 | } |
247 | |
367 | |
248 | void operator delete (void *p, size_t s) |
368 | void operator delete (void *p, size_t s) |
249 | { |
369 | { |
250 | sfree ((char *)p, s); |
370 | sfree ((char *)p, s); |
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309 | { |
429 | { |
310 | p->~Tp (); |
430 | p->~Tp (); |
311 | } |
431 | } |
312 | }; |
432 | }; |
313 | |
433 | |
314 | // P. L'Ecuyer, “Maximally Equidistributed Combined Tausworthe Generators”, Mathematics of Computation, 65, 213 (1996), 203–213. |
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315 | // http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme.ps |
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316 | // http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme2.ps |
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317 | struct tausworthe_random_generator |
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318 | { |
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319 | // generator |
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320 | uint32_t state [4]; |
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321 | |
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322 | void operator =(const tausworthe_random_generator &src) |
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323 | { |
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324 | state [0] = src.state [0]; |
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325 | state [1] = src.state [1]; |
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326 | state [2] = src.state [2]; |
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327 | state [3] = src.state [3]; |
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328 | } |
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329 | |
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330 | void seed (uint32_t seed); |
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331 | uint32_t next (); |
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332 | |
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333 | // uniform distribution |
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334 | uint32_t operator ()(uint32_t num) |
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335 | { |
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336 | return is_constant (num) |
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337 | ? (next () * (uint64_t)num) >> 32U |
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338 | : get_range (num); |
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339 | } |
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340 | |
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341 | // return a number within (min .. max) |
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342 | int operator () (int r_min, int r_max) |
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343 | { |
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344 | return is_constant (r_min) && is_constant (r_max) && r_min <= r_max |
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345 | ? r_min + operator ()(r_max - r_min + 1) |
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346 | : get_range (r_min, r_max); |
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347 | } |
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348 | |
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349 | double operator ()() |
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350 | { |
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351 | return this->next () / (double)0xFFFFFFFFU; |
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352 | } |
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353 | |
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354 | protected: |
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355 | uint32_t get_range (uint32_t r_max); |
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356 | int get_range (int r_min, int r_max); |
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357 | }; |
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358 | |
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359 | typedef tausworthe_random_generator rand_gen; |
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360 | |
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361 | extern rand_gen rndm; |
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362 | |
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363 | INTERFACE_CLASS (attachable) |
434 | INTERFACE_CLASS (attachable) |
364 | struct refcnt_base |
435 | struct refcnt_base |
365 | { |
436 | { |
366 | typedef int refcnt_t; |
437 | typedef int refcnt_t; |
367 | mutable refcnt_t ACC (RW, refcnt); |
438 | mutable refcnt_t ACC (RW, refcnt); |
… | |
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428 | typedef refptr<maptile> maptile_ptr; |
499 | typedef refptr<maptile> maptile_ptr; |
429 | typedef refptr<object> object_ptr; |
500 | typedef refptr<object> object_ptr; |
430 | typedef refptr<archetype> arch_ptr; |
501 | typedef refptr<archetype> arch_ptr; |
431 | typedef refptr<client> client_ptr; |
502 | typedef refptr<client> client_ptr; |
432 | typedef refptr<player> player_ptr; |
503 | typedef refptr<player> player_ptr; |
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504 | typedef refptr<region> region_ptr; |
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505 | |
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506 | #define STRHSH_NULL 2166136261 |
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507 | |
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508 | static inline uint32_t |
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509 | strhsh (const char *s) |
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510 | { |
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511 | // use FNV-1a hash (http://isthe.com/chongo/tech/comp/fnv/) |
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512 | // it is about twice as fast as the one-at-a-time one, |
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513 | // with good distribution. |
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514 | // FNV-1a is faster on many cpus because the multiplication |
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515 | // runs concurrently with the looping logic. |
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516 | uint32_t hash = STRHSH_NULL; |
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517 | |
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518 | while (*s) |
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519 | hash = (hash ^ *s++) * 16777619U; |
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520 | |
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521 | return hash; |
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522 | } |
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523 | |
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524 | static inline uint32_t |
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525 | memhsh (const char *s, size_t len) |
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526 | { |
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527 | uint32_t hash = STRHSH_NULL; |
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528 | |
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529 | while (len--) |
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530 | hash = (hash ^ *s++) * 16777619U; |
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531 | |
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532 | return hash; |
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533 | } |
433 | |
534 | |
434 | struct str_hash |
535 | struct str_hash |
435 | { |
536 | { |
436 | std::size_t operator ()(const char *s) const |
537 | std::size_t operator ()(const char *s) const |
437 | { |
538 | { |
438 | unsigned long hash = 0; |
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439 | |
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440 | /* use the one-at-a-time hash function, which supposedly is |
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441 | * better than the djb2-like one used by perl5.005, but |
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442 | * certainly is better then the bug used here before. |
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443 | * see http://burtleburtle.net/bob/hash/doobs.html |
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444 | */ |
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445 | while (*s) |
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446 | { |
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447 | hash += *s++; |
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448 | hash += hash << 10; |
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449 | hash ^= hash >> 6; |
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450 | } |
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451 | |
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452 | hash += hash << 3; |
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453 | hash ^= hash >> 11; |
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454 | hash += hash << 15; |
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455 | |
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456 | return hash; |
539 | return strhsh (s); |
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540 | } |
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541 | |
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542 | std::size_t operator ()(const shstr &s) const |
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543 | { |
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544 | return strhsh (s); |
457 | } |
545 | } |
458 | }; |
546 | }; |
459 | |
547 | |
460 | struct str_equal |
548 | struct str_equal |
461 | { |
549 | { |
… | |
… | |
553 | { |
641 | { |
554 | erase (&obj); |
642 | erase (&obj); |
555 | } |
643 | } |
556 | }; |
644 | }; |
557 | |
645 | |
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646 | ///////////////////////////////////////////////////////////////////////////// |
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647 | |
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648 | // something like a vector or stack, but without |
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649 | // out of bounds checking |
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650 | template<typename T> |
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651 | struct fixed_stack |
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652 | { |
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653 | T *data; |
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654 | int size; |
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655 | int max; |
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656 | |
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657 | fixed_stack () |
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658 | : size (0), data (0) |
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659 | { |
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660 | } |
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661 | |
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662 | fixed_stack (int max) |
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663 | : size (0), max (max) |
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664 | { |
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665 | data = salloc<T> (max); |
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666 | } |
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667 | |
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668 | void reset (int new_max) |
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669 | { |
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670 | sfree (data, max); |
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671 | size = 0; |
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672 | max = new_max; |
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673 | data = salloc<T> (max); |
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674 | } |
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675 | |
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676 | void free () |
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677 | { |
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678 | sfree (data, max); |
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679 | data = 0; |
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680 | } |
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681 | |
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682 | ~fixed_stack () |
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683 | { |
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684 | sfree (data, max); |
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685 | } |
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686 | |
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687 | T &operator[](int idx) |
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688 | { |
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689 | return data [idx]; |
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690 | } |
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691 | |
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692 | void push (T v) |
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693 | { |
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694 | data [size++] = v; |
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695 | } |
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696 | |
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697 | T &pop () |
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698 | { |
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699 | return data [--size]; |
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700 | } |
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701 | |
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702 | T remove (int idx) |
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703 | { |
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704 | T v = data [idx]; |
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705 | |
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706 | data [idx] = data [--size]; |
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707 | |
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708 | return v; |
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709 | } |
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710 | }; |
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711 | |
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712 | ///////////////////////////////////////////////////////////////////////////// |
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713 | |
558 | // basically does what strncpy should do, but appends "..." to strings exceeding length |
714 | // basically does what strncpy should do, but appends "..." to strings exceeding length |
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715 | // returns the number of bytes actually used (including \0) |
559 | void assign (char *dst, const char *src, int maxlen); |
716 | int assign (char *dst, const char *src, int maxsize); |
560 | |
717 | |
561 | // type-safe version of assign |
718 | // type-safe version of assign |
562 | template<int N> |
719 | template<int N> |
563 | inline void assign (char (&dst)[N], const char *src) |
720 | inline int assign (char (&dst)[N], const char *src) |
564 | { |
721 | { |
565 | assign ((char *)&dst, src, N); |
722 | return assign ((char *)&dst, src, N); |
566 | } |
723 | } |
567 | |
724 | |
568 | typedef double tstamp; |
725 | typedef double tstamp; |
569 | |
726 | |
570 | // return current time as timestamp |
727 | // return current time as timestamp |
571 | tstamp now (); |
728 | tstamp now (); |
572 | |
729 | |
573 | int similar_direction (int a, int b); |
730 | int similar_direction (int a, int b); |
574 | |
731 | |
575 | // like sprintf, but returns a "static" buffer |
732 | // like v?sprintf, but returns a "static" buffer |
576 | const char *format (const char *format, ...); |
733 | char *vformat (const char *format, va_list ap); |
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734 | char *format (const char *format, ...) attribute ((format (printf, 1, 2))); |
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735 | |
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736 | // safety-check player input which will become object->msg |
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737 | bool msg_is_safe (const char *msg); |
577 | |
738 | |
578 | ///////////////////////////////////////////////////////////////////////////// |
739 | ///////////////////////////////////////////////////////////////////////////// |
579 | // threads, very very thin wrappers around pthreads |
740 | // threads, very very thin wrappers around pthreads |
580 | |
741 | |
581 | struct thread |
742 | struct thread |