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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 (©) 2017,2018 Marc Alexander Lehmann / the Deliantra team |
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5 | * Copyright (©) 2005,2006,2007,2008,2009,2010,2011,2012,2013,2014,2015,2016 Marc Alexander Lehmann / Robin Redeker / the Deliantra team |
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6 | * |
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7 | * Deliantra is free software: you can redistribute it and/or modify it under |
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8 | * the terms of the Affero GNU General Public License as published by the |
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9 | * Free Software Foundation, either version 3 of the License, or (at your |
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10 | * option) any later version. |
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11 | * |
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12 | * This program is distributed in the hope that it will be useful, |
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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15 | * GNU General Public License for more details. |
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16 | * |
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17 | * You should have received a copy of the Affero GNU General Public License |
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18 | * and the GNU General Public License along with this program. If not, see |
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19 | * <http://www.gnu.org/licenses/>. |
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20 | * |
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21 | * The authors can be reached via e-mail to <support@deliantra.net> |
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22 | */ |
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23 | |
1 | #ifndef UTIL_H__ |
24 | #ifndef UTIL_H__ |
2 | #define UTIL_H__ |
25 | #define UTIL_H__ |
3 | |
26 | |
4 | //#define PREFER_MALLOC |
27 | #define DEBUG_POISON 0x00 // poison memory before freeing it if != 0 |
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28 | #define DEBUG_SALLOC 0 // add a debug wrapper around all sallocs |
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29 | #define PREFER_MALLOC 0 // use malloc and not the slice allocator |
5 | |
30 | |
6 | #if __GNUC__ >= 3 |
31 | #include <pthread.h> |
7 | # define is_constant(c) __builtin_constant_p (c) |
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8 | #else |
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9 | # define is_constant(c) 0 |
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10 | #endif |
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11 | |
32 | |
12 | #include <cstddef> |
33 | #include <cstddef> |
13 | #include <cmath> |
34 | #include <cmath> |
14 | #include <new> |
35 | #include <new> |
15 | #include <vector> |
36 | #include <vector> |
16 | |
37 | |
17 | #include <glib.h> |
38 | #include <glib.h> |
18 | |
39 | |
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40 | #include <flat_hash_map.hpp> |
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41 | |
19 | #include <shstr.h> |
42 | #include <shstr.h> |
20 | #include <traits.h> |
43 | #include <traits.h> |
21 | |
44 | |
22 | // use a gcc extension for auto declarations until ISO C++ sanctifies them |
45 | #include "ecb.h" |
23 | #define AUTODECL(var,expr) typeof(expr) var = (expr) |
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24 | |
46 | |
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47 | #if DEBUG_SALLOC |
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48 | # define g_slice_alloc0(s) debug_slice_alloc0(s) |
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49 | # define g_slice_alloc(s) debug_slice_alloc(s) |
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50 | # define g_slice_free1(s,p) debug_slice_free1(s,p) |
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51 | void *g_slice_alloc (unsigned long size); |
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52 | void *g_slice_alloc0 (unsigned long size); |
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53 | void g_slice_free1 (unsigned long size, void *ptr); |
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54 | #elif PREFER_MALLOC |
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55 | # define g_slice_alloc0(s) calloc (1, (s)) |
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56 | # define g_slice_alloc(s) malloc ((s)) |
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57 | # define g_slice_free1(s,p) free ((p)) |
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58 | #endif |
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59 | |
25 | // very ugly macro that basicaly declares and initialises a variable |
60 | // very ugly macro that basically declares and initialises a variable |
26 | // that is in scope for the next statement only |
61 | // that is in scope for the next statement only |
27 | // works only for stuff that can be assigned 0 and converts to false |
62 | // works only for stuff that can be assigned 0 and converts to false |
28 | // (note: works great for pointers) |
63 | // (note: works great for pointers) |
29 | // most ugly macro I ever wrote |
64 | // most ugly macro I ever wrote |
30 | #define declvar(type, name, value) if (type name = 0) { } else if (((name) = (value)), 1) |
65 | #define statementvar(type, name, value) if (type name = 0) { } else if (((name) = (value)), 1) |
31 | |
66 | |
32 | // in range including end |
67 | // in range including end |
33 | #define IN_RANGE_INC(val,beg,end) \ |
68 | #define IN_RANGE_INC(val,beg,end) \ |
34 | ((unsigned int)(val) - (unsigned int)(beg) <= (unsigned int)(end) - (unsigned int)(beg)) |
69 | ((unsigned int)(val) - (unsigned int)(beg) <= (unsigned int)(end) - (unsigned int)(beg)) |
35 | |
70 | |
36 | // in range excluding end |
71 | // in range excluding end |
37 | #define IN_RANGE_EXC(val,beg,end) \ |
72 | #define IN_RANGE_EXC(val,beg,end) \ |
38 | ((unsigned int)(val) - (unsigned int)(beg) < (unsigned int)(end) - (unsigned int)(beg)) |
73 | ((unsigned int)(val) - (unsigned int)(beg) < (unsigned int)(end) - (unsigned int)(beg)) |
39 | |
74 | |
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75 | ecb_cold void cleanup (const char *cause, bool make_core = false); |
40 | void fork_abort (const char *msg); |
76 | ecb_cold void fork_abort (const char *msg); |
41 | |
77 | |
42 | // rationale for using (U) not (T) is to reduce signed/unsigned issues, |
78 | // rationale for using (U) not (T) is to reduce signed/unsigned issues, |
43 | // as a is often a constant while b is the variable. it is still a bug, though. |
79 | // as a is often a constant while b is the variable. it is still a bug, though. |
44 | template<typename T, typename U> static inline T min (T a, U b) { return (U)a < b ? (U)a : b; } |
80 | template<typename T, typename U> static inline T min (T a, U b) { return a < (T)b ? a : (T)b; } |
45 | template<typename T, typename U> static inline T max (T a, U b) { return (U)a > b ? (U)a : b; } |
81 | template<typename T, typename U> static inline T max (T a, U b) { return a > (T)b ? a : (T)b; } |
46 | 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; } |
82 | 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; } |
47 | |
83 | |
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84 | template<typename T, typename U> static inline void min_it (T &v, U m) { v = min (v, (T)m); } |
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85 | template<typename T, typename U> static inline void max_it (T &v, U m) { v = max (v, (T)m); } |
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86 | 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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87 | |
48 | template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; } |
88 | 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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89 | |
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90 | 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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91 | 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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92 | |
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93 | // sign returns -1 or +1 |
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94 | template<typename T> |
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95 | static inline T sign (T v) { return v < 0 ? -1 : +1; } |
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96 | // relies on 2c representation |
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97 | template<> |
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98 | inline sint8 sign (sint8 v) { return 1 - (sint8 (uint8 (v) >> 7) * 2); } |
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99 | template<> |
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100 | inline sint16 sign (sint16 v) { return 1 - (sint16 (uint16 (v) >> 15) * 2); } |
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101 | template<> |
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102 | inline sint32 sign (sint32 v) { return 1 - (sint32 (uint32 (v) >> 31) * 2); } |
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103 | |
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104 | // sign0 returns -1, 0 or +1 |
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105 | template<typename T> |
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106 | static inline T sign0 (T v) { return v ? sign (v) : 0; } |
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107 | |
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108 | //clashes with C++0x |
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109 | template<typename T, typename U> |
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110 | static inline T copysign (T a, U b) { return a > 0 ? b : -b; } |
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111 | |
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112 | // div* only work correctly for div > 0 |
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113 | // div, with correct rounding (< 0.5 downwards, >=0.5 upwards) |
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114 | template<typename T> static inline T div (T val, T div) |
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115 | { |
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116 | return ecb_expect_false (val < 0) ? - ((-val + (div - 1) / 2) / div) : (val + div / 2) / div; |
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117 | } |
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118 | |
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119 | template<> inline float div (float val, float div) { return val / div; } |
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120 | template<> inline double div (double val, double div) { return val / div; } |
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121 | |
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122 | // div, round-up |
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123 | template<typename T> static inline T div_ru (T val, T div) |
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124 | { |
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125 | return ecb_expect_false (val < 0) ? - ((-val ) / div) : (val + div - 1) / div; |
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126 | } |
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127 | // div, round-down |
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128 | template<typename T> static inline T div_rd (T val, T div) |
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129 | { |
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130 | return ecb_expect_false (val < 0) ? - ((-val + (div - 1) ) / div) : (val ) / div; |
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131 | } |
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132 | |
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133 | // lerp* only work correctly for min_in < max_in |
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134 | // Linear intERPolate, scales val from min_in..max_in to min_out..max_out |
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135 | template<typename T> |
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136 | static inline T |
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137 | lerp (T val, T min_in, T max_in, T min_out, T max_out) |
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138 | { |
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139 | return min_out + div <T> ((val - min_in) * (max_out - min_out), max_in - min_in); |
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140 | } |
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141 | |
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142 | // lerp, round-down |
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143 | template<typename T> |
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144 | static inline T |
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145 | lerp_rd (T val, T min_in, T max_in, T min_out, T max_out) |
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146 | { |
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147 | return min_out + div_rd<T> ((val - min_in) * (max_out - min_out), max_in - min_in); |
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148 | } |
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149 | |
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150 | // lerp, round-up |
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151 | template<typename T> |
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152 | static inline T |
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153 | lerp_ru (T val, T min_in, T max_in, T min_out, T max_out) |
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154 | { |
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155 | return min_out + div_ru<T> ((val - min_in) * (max_out - min_out), max_in - min_in); |
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156 | } |
49 | |
157 | |
50 | // lots of stuff taken from FXT |
158 | // lots of stuff taken from FXT |
51 | |
159 | |
52 | /* Rotate right. This is used in various places for checksumming */ |
160 | /* Rotate right. This is used in various places for checksumming */ |
53 | //TODO: that sucks, use a better checksum algo |
161 | //TODO: that sucks, use a better checksum algo |
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90 | int32_t d = b - a; |
198 | int32_t d = b - a; |
91 | d &= d >> 31; |
199 | d &= d >> 31; |
92 | return b - d; |
200 | return b - d; |
93 | } |
201 | } |
94 | |
202 | |
95 | // this is much faster than crossfires original algorithm |
203 | // this is much faster than crossfire's original algorithm |
96 | // on modern cpus |
204 | // on modern cpus |
97 | inline int |
205 | inline int |
98 | isqrt (int n) |
206 | isqrt (int n) |
99 | { |
207 | { |
100 | return (int)sqrtf ((float)n); |
208 | return (int)sqrtf ((float)n); |
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209 | } |
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210 | |
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211 | // this is kind of like the ^^ operator, if it would exist, without sequence point. |
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212 | // more handy than it looks like, due to the implicit !! done on its arguments |
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213 | inline bool |
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214 | logical_xor (bool a, bool b) |
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215 | { |
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216 | return a != b; |
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217 | } |
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218 | |
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219 | inline bool |
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220 | logical_implies (bool a, bool b) |
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221 | { |
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222 | return a <= b; |
101 | } |
223 | } |
102 | |
224 | |
103 | // this is only twice as fast as naive sqrtf (dx*dy+dy*dy) |
225 | // this is only twice as fast as naive sqrtf (dx*dy+dy*dy) |
104 | #if 0 |
226 | #if 0 |
105 | // and has a max. error of 6 in the range -100..+100. |
227 | // and has a max. error of 6 in the range -100..+100. |
106 | #else |
228 | #else |
107 | // and has a max. error of 9 in the range -100..+100. |
229 | // and has a max. error of 9 in the range -100..+100. |
108 | #endif |
230 | #endif |
109 | inline int |
231 | inline int |
110 | idistance (int dx, int dy) |
232 | idistance (int dx, int dy) |
111 | { |
233 | { |
112 | unsigned int dx_ = abs (dx); |
234 | unsigned int dx_ = abs (dx); |
113 | unsigned int dy_ = abs (dy); |
235 | unsigned int dy_ = abs (dy); |
114 | |
236 | |
115 | #if 0 |
237 | #if 0 |
116 | return dx_ > dy_ |
238 | return dx_ > dy_ |
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119 | #else |
241 | #else |
120 | return dx_ + dy_ - min (dx_, dy_) * 5 / 8; |
242 | return dx_ + dy_ - min (dx_, dy_) * 5 / 8; |
121 | #endif |
243 | #endif |
122 | } |
244 | } |
123 | |
245 | |
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246 | // can be substantially faster than floor, if your value range allows for it |
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247 | template<typename T> |
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248 | inline T |
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249 | fastfloor (T x) |
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250 | { |
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251 | return std::floor (x); |
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252 | } |
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253 | |
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254 | inline float |
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255 | fastfloor (float x) |
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256 | { |
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257 | return sint32(x) - (x < 0); |
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258 | } |
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259 | |
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260 | inline double |
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261 | fastfloor (double x) |
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262 | { |
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263 | return sint64(x) - (x < 0); |
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264 | } |
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265 | |
124 | /* |
266 | /* |
125 | * absdir(int): Returns a number between 1 and 8, which represent |
267 | * absdir(int): Returns a number between 1 and 8, which represent |
126 | * the "absolute" direction of a number (it actually takes care of |
268 | * the "absolute" direction of a number (it actually takes care of |
127 | * "overflow" in previous calculations of a direction). |
269 | * "overflow" in previous calculations of a direction). |
128 | */ |
270 | */ |
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130 | absdir (int d) |
272 | absdir (int d) |
131 | { |
273 | { |
132 | return ((d - 1) & 7) + 1; |
274 | return ((d - 1) & 7) + 1; |
133 | } |
275 | } |
134 | |
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 = ecb_ctz32 (mask_)), mask_ &= ~(1 << idxvar), 1);) |
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280 | |
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281 | extern ssize_t slice_alloc; // statistics |
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282 | |
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283 | void *salloc_ (int n); |
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284 | void *salloc_ (int n, void *src); |
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285 | |
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286 | // strictly the same as g_slice_alloc, but never returns 0 |
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287 | template<typename T> |
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288 | inline T *salloc (int n = 1) { return (T *)salloc_ (n * sizeof (T)); } |
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289 | |
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290 | // also copies src into the new area, like "memdup" |
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291 | // if src is 0, clears the memory |
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292 | template<typename T> |
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293 | inline T *salloc (int n, T *src) { return (T *)salloc_ (n * sizeof (T), (void *)src); } |
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294 | |
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295 | // clears the memory |
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296 | template<typename T> |
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297 | inline T *salloc0(int n = 1) { return (T *)salloc_ (n * sizeof (T), 0); } |
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298 | |
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299 | // for symmetry |
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300 | template<typename T> |
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301 | inline void sfree (T *ptr, int n = 1) noexcept |
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302 | { |
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303 | if (ecb_expect_true (ptr)) |
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304 | { |
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305 | slice_alloc -= n * sizeof (T); |
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306 | if (DEBUG_POISON) memset (ptr, DEBUG_POISON, n * sizeof (T)); |
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307 | g_slice_free1 (n * sizeof (T), (void *)ptr); |
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308 | } |
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309 | } |
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310 | |
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311 | // nulls the pointer |
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312 | template<typename T> |
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313 | inline void sfree0 (T *&ptr, int n = 1) noexcept |
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314 | { |
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315 | sfree<T> (ptr, n); |
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316 | ptr = 0; |
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317 | } |
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318 | |
135 | // makes dynamically allocated objects zero-initialised |
319 | // makes dynamically allocated objects zero-initialised |
136 | struct zero_initialised |
320 | struct zero_initialised |
137 | { |
321 | { |
138 | void *operator new (size_t s, void *p) |
322 | void *operator new (size_t s, void *p) |
139 | { |
323 | { |
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141 | return p; |
325 | return p; |
142 | } |
326 | } |
143 | |
327 | |
144 | void *operator new (size_t s) |
328 | void *operator new (size_t s) |
145 | { |
329 | { |
146 | return g_slice_alloc0 (s); |
330 | return salloc0<char> (s); |
147 | } |
331 | } |
148 | |
332 | |
149 | void *operator new[] (size_t s) |
333 | void *operator new[] (size_t s) |
150 | { |
334 | { |
151 | return g_slice_alloc0 (s); |
335 | return salloc0<char> (s); |
152 | } |
336 | } |
153 | |
337 | |
154 | void operator delete (void *p, size_t s) |
338 | void operator delete (void *p, size_t s) |
155 | { |
339 | { |
156 | g_slice_free1 (s, p); |
340 | sfree ((char *)p, s); |
157 | } |
341 | } |
158 | |
342 | |
159 | void operator delete[] (void *p, size_t s) |
343 | void operator delete[] (void *p, size_t s) |
160 | { |
344 | { |
161 | g_slice_free1 (s, p); |
345 | sfree ((char *)p, s); |
162 | } |
346 | } |
163 | }; |
347 | }; |
164 | |
348 | |
165 | void *salloc_ (int n) throw (std::bad_alloc); |
349 | // makes dynamically allocated objects zero-initialised |
166 | void *salloc_ (int n, void *src) throw (std::bad_alloc); |
350 | struct slice_allocated |
167 | |
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168 | // strictly the same as g_slice_alloc, but never returns 0 |
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169 | template<typename T> |
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170 | inline T *salloc (int n = 1) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T)); } |
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171 | |
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172 | // also copies src into the new area, like "memdup" |
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173 | // if src is 0, clears the memory |
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174 | template<typename T> |
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175 | inline T *salloc (int n, T *src) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T), (void *)src); } |
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176 | |
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177 | // clears the memory |
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178 | template<typename T> |
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179 | inline T *salloc0(int n = 1) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T), 0); } |
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180 | |
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181 | // for symmetry |
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182 | template<typename T> |
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183 | inline void sfree (T *ptr, int n = 1) throw () |
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184 | { |
351 | { |
185 | #ifdef PREFER_MALLOC |
352 | void *operator new (size_t s, void *p) |
186 | free (ptr); |
353 | { |
187 | #else |
354 | return p; |
188 | g_slice_free1 (n * sizeof (T), (void *)ptr); |
355 | } |
189 | #endif |
356 | |
190 | } |
357 | void *operator new (size_t s) |
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358 | { |
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359 | return salloc<char> (s); |
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360 | } |
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361 | |
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362 | void *operator new[] (size_t s) |
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363 | { |
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364 | return salloc<char> (s); |
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365 | } |
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366 | |
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367 | void operator delete (void *p, size_t s) |
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368 | { |
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369 | sfree ((char *)p, s); |
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370 | } |
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371 | |
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372 | void operator delete[] (void *p, size_t s) |
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373 | { |
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374 | sfree ((char *)p, s); |
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375 | } |
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376 | }; |
191 | |
377 | |
192 | // a STL-compatible allocator that uses g_slice |
378 | // a STL-compatible allocator that uses g_slice |
193 | // boy, this is verbose |
379 | // boy, this is much less verbose in newer C++ versions |
194 | template<typename Tp> |
380 | template<typename Tp> |
195 | struct slice_allocator |
381 | struct slice_allocator |
196 | { |
382 | { |
197 | typedef size_t size_type; |
383 | using value_type = Tp; |
198 | typedef ptrdiff_t difference_type; |
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199 | typedef Tp *pointer; |
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200 | typedef const Tp *const_pointer; |
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201 | typedef Tp &reference; |
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202 | typedef const Tp &const_reference; |
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203 | typedef Tp value_type; |
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204 | |
384 | |
205 | template <class U> |
385 | slice_allocator () noexcept { } |
206 | struct rebind |
386 | template<class U> slice_allocator (const slice_allocator<U> &) noexcept {} |
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387 | |
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388 | value_type *allocate (std::size_t n) |
207 | { |
389 | { |
208 | typedef slice_allocator<U> other; |
390 | return salloc<Tp> (n); |
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391 | } |
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392 | |
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393 | void deallocate (value_type *p, std::size_t n) |
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394 | { |
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395 | sfree<Tp> (p, n); |
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396 | } |
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397 | }; |
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398 | |
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399 | template<class T, class U> |
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400 | bool operator == (const slice_allocator<T> &, const slice_allocator<U> &) noexcept |
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401 | { |
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402 | return true; |
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403 | } |
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404 | |
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405 | template<class T, class U> |
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406 | bool operator != (const slice_allocator<T> &x, const slice_allocator<U> &y) noexcept |
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407 | { |
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408 | return !(x == y); |
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409 | } |
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410 | |
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411 | // basically a memory area, but refcounted |
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412 | struct refcnt_buf |
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413 | { |
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414 | char *data; |
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415 | |
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416 | refcnt_buf (size_t size = 0); |
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417 | refcnt_buf (void *data, size_t size); |
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418 | |
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419 | refcnt_buf (const refcnt_buf &src) |
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420 | { |
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421 | data = src.data; |
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422 | inc (); |
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423 | } |
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424 | |
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425 | ~refcnt_buf (); |
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426 | |
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427 | refcnt_buf &operator =(const refcnt_buf &src); |
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428 | |
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429 | operator char *() |
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430 | { |
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431 | return data; |
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432 | } |
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433 | |
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434 | size_t size () const |
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435 | { |
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436 | return _size (); |
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437 | } |
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438 | |
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439 | protected: |
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440 | enum { |
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441 | overhead = sizeof (uint32_t) * 2 |
209 | }; |
442 | }; |
210 | |
443 | |
211 | slice_allocator () throw () { } |
444 | uint32_t &_size () const |
212 | slice_allocator (const slice_allocator &o) throw () { } |
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213 | template<typename Tp2> |
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214 | slice_allocator (const slice_allocator<Tp2> &) throw () { } |
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215 | |
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216 | ~slice_allocator () { } |
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217 | |
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218 | pointer address (reference x) const { return &x; } |
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219 | const_pointer address (const_reference x) const { return &x; } |
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220 | |
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221 | pointer allocate (size_type n, const_pointer = 0) |
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222 | { |
445 | { |
223 | return salloc<Tp> (n); |
446 | return ((unsigned int *)data)[-2]; |
224 | } |
447 | } |
225 | |
448 | |
226 | void deallocate (pointer p, size_type n) |
449 | uint32_t &_refcnt () const |
227 | { |
450 | { |
228 | sfree<Tp> (p, n); |
451 | return ((unsigned int *)data)[-1]; |
229 | } |
452 | } |
230 | |
453 | |
231 | size_type max_size ()const throw () |
454 | void _alloc (uint32_t size) |
232 | { |
455 | { |
233 | return size_t (-1) / sizeof (Tp); |
456 | data = ((char *)salloc<char> (size + overhead)) + overhead; |
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457 | _size () = size; |
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458 | _refcnt () = 1; |
234 | } |
459 | } |
235 | |
460 | |
236 | void construct (pointer p, const Tp &val) |
461 | void _dealloc (); |
237 | { |
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238 | ::new (p) Tp (val); |
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239 | } |
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240 | |
462 | |
241 | void destroy (pointer p) |
463 | void inc () |
242 | { |
464 | { |
243 | p->~Tp (); |
465 | ++_refcnt (); |
244 | } |
466 | } |
245 | }; |
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246 | |
467 | |
247 | // P. L'Ecuyer, “Maximally Equidistributed Combined Tausworthe Generators”, Mathematics of Computation, 65, 213 (1996), 203–213. |
468 | void dec () |
248 | // http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme.ps |
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249 | // http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme2.ps |
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250 | struct tausworthe_random_generator |
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251 | { |
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252 | // generator |
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253 | uint32_t state [4]; |
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254 | |
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255 | void operator =(const tausworthe_random_generator &src) |
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256 | { |
469 | { |
257 | state [0] = src.state [0]; |
470 | if (!--_refcnt ()) |
258 | state [1] = src.state [1]; |
471 | _dealloc (); |
259 | state [2] = src.state [2]; |
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260 | state [3] = src.state [3]; |
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261 | } |
472 | } |
262 | |
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263 | void seed (uint32_t seed); |
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264 | uint32_t next (); |
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265 | |
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266 | // uniform distribution |
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267 | uint32_t operator ()(uint32_t r_max) |
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268 | { |
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269 | return is_constant (r_max) |
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270 | ? this->next () % r_max |
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271 | : get_range (r_max); |
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272 | } |
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273 | |
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274 | // return a number within (min .. max) |
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275 | int operator () (int r_min, int r_max) |
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276 | { |
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277 | return is_constant (r_min) && is_constant (r_max) |
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278 | ? r_min + (*this) (max (r_max - r_min + 1, 1)) |
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279 | : get_range (r_min, r_max); |
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280 | } |
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281 | |
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282 | double operator ()() |
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283 | { |
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284 | return this->next () / (double)0xFFFFFFFFU; |
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285 | } |
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286 | |
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287 | protected: |
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288 | uint32_t get_range (uint32_t r_max); |
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289 | int get_range (int r_min, int r_max); |
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290 | }; |
473 | }; |
291 | |
474 | |
292 | typedef tausworthe_random_generator rand_gen; |
475 | INTERFACE_CLASS (attachable) |
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476 | struct refcnt_base |
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477 | { |
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478 | typedef int refcnt_t; |
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479 | mutable refcnt_t ACC (RW, refcnt); |
293 | |
480 | |
294 | extern rand_gen rndm; |
481 | MTH void refcnt_inc () const { ++refcnt; } |
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482 | MTH void refcnt_dec () const { --refcnt; } |
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483 | |
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484 | refcnt_base () : refcnt (0) { } |
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485 | }; |
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486 | |
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487 | // to avoid branches with more advanced compilers |
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488 | extern refcnt_base::refcnt_t refcnt_dummy; |
295 | |
489 | |
296 | template<class T> |
490 | template<class T> |
297 | struct refptr |
491 | struct refptr |
298 | { |
492 | { |
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493 | // p if not null |
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494 | refcnt_base::refcnt_t *refcnt_ref () { return p ? &p->refcnt : &refcnt_dummy; } |
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495 | |
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496 | void refcnt_dec () |
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497 | { |
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498 | if (!ecb_is_constant (p)) |
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499 | --*refcnt_ref (); |
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500 | else if (p) |
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501 | --p->refcnt; |
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502 | } |
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503 | |
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504 | void refcnt_inc () |
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505 | { |
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506 | if (!ecb_is_constant (p)) |
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507 | ++*refcnt_ref (); |
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508 | else if (p) |
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509 | ++p->refcnt; |
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510 | } |
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511 | |
299 | T *p; |
512 | T *p; |
300 | |
513 | |
301 | refptr () : p(0) { } |
514 | refptr () : p(0) { } |
302 | refptr (const refptr<T> &p) : p(p.p) { if (p) p->refcnt_inc (); } |
515 | refptr (const refptr<T> &p) : p(p.p) { refcnt_inc (); } |
303 | refptr (T *p) : p(p) { if (p) p->refcnt_inc (); } |
516 | refptr (T *p) : p(p) { refcnt_inc (); } |
304 | ~refptr () { if (p) p->refcnt_dec (); } |
517 | ~refptr () { refcnt_dec (); } |
305 | |
518 | |
306 | const refptr<T> &operator =(T *o) |
519 | const refptr<T> &operator =(T *o) |
307 | { |
520 | { |
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521 | // if decrementing ever destroys we need to reverse the order here |
308 | if (p) p->refcnt_dec (); |
522 | refcnt_dec (); |
309 | p = o; |
523 | p = o; |
310 | if (p) p->refcnt_inc (); |
524 | refcnt_inc (); |
311 | |
|
|
312 | return *this; |
525 | return *this; |
313 | } |
526 | } |
314 | |
527 | |
315 | const refptr<T> &operator =(const refptr<T> o) |
528 | const refptr<T> &operator =(const refptr<T> &o) |
316 | { |
529 | { |
317 | *this = o.p; |
530 | *this = o.p; |
318 | return *this; |
531 | return *this; |
319 | } |
532 | } |
320 | |
533 | |
321 | T &operator * () const { return *p; } |
534 | T &operator * () const { return *p; } |
322 | T *operator ->() const { return p; } |
535 | T *operator ->() const { return p; } |
323 | |
536 | |
324 | operator T *() const { return p; } |
537 | operator T *() const { return p; } |
325 | }; |
538 | }; |
326 | |
539 | |
327 | typedef refptr<maptile> maptile_ptr; |
540 | typedef refptr<maptile> maptile_ptr; |
328 | typedef refptr<object> object_ptr; |
541 | typedef refptr<object> object_ptr; |
329 | typedef refptr<archetype> arch_ptr; |
542 | typedef refptr<archetype> arch_ptr; |
330 | typedef refptr<client> client_ptr; |
543 | typedef refptr<client> client_ptr; |
331 | typedef refptr<player> player_ptr; |
544 | typedef refptr<player> player_ptr; |
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545 | typedef refptr<region> region_ptr; |
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546 | |
|
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547 | #define STRHSH_NULL 2166136261 |
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548 | |
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549 | static inline uint32_t |
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550 | strhsh (const char *s) |
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551 | { |
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552 | // use FNV-1a hash (http://isthe.com/chongo/tech/comp/fnv/) |
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|
553 | // it is about twice as fast as the one-at-a-time one, |
|
|
554 | // with good distribution. |
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|
555 | // FNV-1a is faster on many cpus because the multiplication |
|
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556 | // runs concurrently with the looping logic. |
|
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557 | // we modify the hash a bit to improve its distribution |
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558 | uint32_t hash = STRHSH_NULL; |
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|
559 | |
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560 | while (*s) |
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|
561 | hash = (hash ^ *s++) * 16777619U; |
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|
562 | |
|
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563 | return hash ^ (hash >> 16); |
|
|
564 | } |
|
|
565 | |
|
|
566 | static inline uint32_t |
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567 | memhsh (const char *s, size_t len) |
|
|
568 | { |
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|
569 | uint32_t hash = STRHSH_NULL; |
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570 | |
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|
571 | while (len--) |
|
|
572 | hash = (hash ^ *s++) * 16777619U; |
|
|
573 | |
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|
574 | return hash; |
|
|
575 | } |
332 | |
576 | |
333 | struct str_hash |
577 | struct str_hash |
334 | { |
578 | { |
335 | std::size_t operator ()(const char *s) const |
579 | std::size_t operator ()(const char *s) const |
336 | { |
580 | { |
337 | unsigned long hash = 0; |
|
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338 | |
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339 | /* use the one-at-a-time hash function, which supposedly is |
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340 | * better than the djb2-like one used by perl5.005, but |
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341 | * certainly is better then the bug used here before. |
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342 | * see http://burtleburtle.net/bob/hash/doobs.html |
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343 | */ |
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344 | while (*s) |
|
|
345 | { |
|
|
346 | hash += *s++; |
|
|
347 | hash += hash << 10; |
|
|
348 | hash ^= hash >> 6; |
|
|
349 | } |
|
|
350 | |
|
|
351 | hash += hash << 3; |
|
|
352 | hash ^= hash >> 11; |
|
|
353 | hash += hash << 15; |
|
|
354 | |
|
|
355 | return hash; |
581 | return strhsh (s); |
356 | } |
582 | } |
|
|
583 | |
|
|
584 | std::size_t operator ()(const shstr &s) const |
|
|
585 | { |
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|
586 | return strhsh (s); |
|
|
587 | } |
|
|
588 | |
|
|
589 | typedef ska::power_of_two_hash_policy hash_policy; |
357 | }; |
590 | }; |
358 | |
591 | |
359 | struct str_equal |
592 | struct str_equal |
360 | { |
593 | { |
361 | bool operator ()(const char *a, const char *b) const |
594 | bool operator ()(const char *a, const char *b) const |
362 | { |
595 | { |
363 | return !strcmp (a, b); |
596 | return !strcmp (a, b); |
364 | } |
597 | } |
365 | }; |
598 | }; |
366 | |
599 | |
|
|
600 | // Mostly the same as std::vector, but insert/erase can reorder |
|
|
601 | // the elements, making append(=insert)/remove O(1) instead of O(n). |
|
|
602 | // |
|
|
603 | // NOTE: only some forms of erase are available |
367 | template<class T> |
604 | template<class T> |
368 | struct unordered_vector : std::vector<T, slice_allocator<T> > |
605 | struct unordered_vector : std::vector<T, slice_allocator<T> > |
369 | { |
606 | { |
370 | typedef typename unordered_vector::iterator iterator; |
607 | typedef typename unordered_vector::iterator iterator; |
371 | |
608 | |
… | |
… | |
381 | { |
618 | { |
382 | erase ((unsigned int )(i - this->begin ())); |
619 | erase ((unsigned int )(i - this->begin ())); |
383 | } |
620 | } |
384 | }; |
621 | }; |
385 | |
622 | |
386 | template<class T, int T::* index> |
623 | // This container blends advantages of linked lists |
|
|
624 | // (efficiency) with vectors (random access) by |
|
|
625 | // using an unordered vector and storing the vector |
|
|
626 | // index inside the object. |
|
|
627 | // |
|
|
628 | // + memory-efficient on most 64 bit archs |
|
|
629 | // + O(1) insert/remove |
|
|
630 | // + free unique (but varying) id for inserted objects |
|
|
631 | // + cache-friendly iteration |
|
|
632 | // - only works for pointers to structs |
|
|
633 | // |
|
|
634 | // NOTE: only some forms of erase/insert are available |
|
|
635 | typedef int object_vector_index; |
|
|
636 | |
|
|
637 | template<class T, object_vector_index T::*indexmember> |
387 | struct object_vector : std::vector<T *, slice_allocator<T *> > |
638 | struct object_vector : std::vector<T *, slice_allocator<T *> > |
388 | { |
639 | { |
|
|
640 | typedef typename object_vector::iterator iterator; |
|
|
641 | |
|
|
642 | bool contains (const T *obj) const |
|
|
643 | { |
|
|
644 | return obj->*indexmember; |
|
|
645 | } |
|
|
646 | |
|
|
647 | iterator find (const T *obj) |
|
|
648 | { |
|
|
649 | return obj->*indexmember |
|
|
650 | ? this->begin () + obj->*indexmember - 1 |
|
|
651 | : this->end (); |
|
|
652 | } |
|
|
653 | |
|
|
654 | void push_back (T *obj) |
|
|
655 | { |
|
|
656 | std::vector<T *, slice_allocator<T *> >::push_back (obj); |
|
|
657 | obj->*indexmember = this->size (); |
|
|
658 | } |
|
|
659 | |
389 | void insert (T *obj) |
660 | void insert (T *obj) |
390 | { |
661 | { |
391 | assert (!(obj->*index)); |
|
|
392 | push_back (obj); |
662 | push_back (obj); |
393 | obj->*index = this->size (); |
|
|
394 | } |
663 | } |
395 | |
664 | |
396 | void insert (T &obj) |
665 | void insert (T &obj) |
397 | { |
666 | { |
398 | insert (&obj); |
667 | insert (&obj); |
399 | } |
668 | } |
400 | |
669 | |
401 | void erase (T *obj) |
670 | void erase (T *obj) |
402 | { |
671 | { |
403 | assert (obj->*index); |
672 | object_vector_index pos = obj->*indexmember; |
404 | int pos = obj->*index; |
|
|
405 | obj->*index = 0; |
673 | obj->*indexmember = 0; |
406 | |
674 | |
407 | if (pos < this->size ()) |
675 | if (pos < this->size ()) |
408 | { |
676 | { |
409 | (*this)[pos - 1] = (*this)[this->size () - 1]; |
677 | (*this)[pos - 1] = (*this)[this->size () - 1]; |
410 | (*this)[pos - 1]->*index = pos; |
678 | (*this)[pos - 1]->*indexmember = pos; |
411 | } |
679 | } |
412 | |
680 | |
413 | this->pop_back (); |
681 | this->pop_back (); |
414 | } |
682 | } |
415 | |
683 | |
416 | void erase (T &obj) |
684 | void erase (T &obj) |
417 | { |
685 | { |
418 | errase (&obj); |
686 | erase (&obj); |
419 | } |
687 | } |
420 | }; |
688 | }; |
|
|
689 | |
|
|
690 | ///////////////////////////////////////////////////////////////////////////// |
|
|
691 | |
|
|
692 | // something like a vector or stack, but without |
|
|
693 | // out of bounds checking |
|
|
694 | template<typename T> |
|
|
695 | struct fixed_stack |
|
|
696 | { |
|
|
697 | T *data; |
|
|
698 | int size; |
|
|
699 | int max; |
|
|
700 | |
|
|
701 | fixed_stack () |
|
|
702 | : size (0), data (0) |
|
|
703 | { |
|
|
704 | } |
|
|
705 | |
|
|
706 | fixed_stack (int max) |
|
|
707 | : size (0), max (max) |
|
|
708 | { |
|
|
709 | data = salloc<T> (max); |
|
|
710 | } |
|
|
711 | |
|
|
712 | void reset (int new_max) |
|
|
713 | { |
|
|
714 | sfree (data, max); |
|
|
715 | size = 0; |
|
|
716 | max = new_max; |
|
|
717 | data = salloc<T> (max); |
|
|
718 | } |
|
|
719 | |
|
|
720 | void free () |
|
|
721 | { |
|
|
722 | sfree (data, max); |
|
|
723 | data = 0; |
|
|
724 | } |
|
|
725 | |
|
|
726 | ~fixed_stack () |
|
|
727 | { |
|
|
728 | sfree (data, max); |
|
|
729 | } |
|
|
730 | |
|
|
731 | T &operator[](int idx) |
|
|
732 | { |
|
|
733 | return data [idx]; |
|
|
734 | } |
|
|
735 | |
|
|
736 | void push (T v) |
|
|
737 | { |
|
|
738 | data [size++] = v; |
|
|
739 | } |
|
|
740 | |
|
|
741 | T &pop () |
|
|
742 | { |
|
|
743 | return data [--size]; |
|
|
744 | } |
|
|
745 | |
|
|
746 | T remove (int idx) |
|
|
747 | { |
|
|
748 | T v = data [idx]; |
|
|
749 | |
|
|
750 | data [idx] = data [--size]; |
|
|
751 | |
|
|
752 | return v; |
|
|
753 | } |
|
|
754 | }; |
|
|
755 | |
|
|
756 | ///////////////////////////////////////////////////////////////////////////// |
421 | |
757 | |
422 | // basically does what strncpy should do, but appends "..." to strings exceeding length |
758 | // basically does what strncpy should do, but appends "..." to strings exceeding length |
|
|
759 | // returns the number of bytes actually used (including \0) |
423 | void assign (char *dst, const char *src, int maxlen); |
760 | int assign (char *dst, const char *src, int maxsize); |
424 | |
761 | |
425 | // type-safe version of assign |
762 | // type-safe version of assign |
426 | template<int N> |
763 | template<int N> |
427 | inline void assign (char (&dst)[N], const char *src) |
764 | inline int assign (char (&dst)[N], const char *src) |
428 | { |
765 | { |
429 | assign ((char *)&dst, src, N); |
766 | return assign ((char *)&dst, src, N); |
430 | } |
767 | } |
431 | |
768 | |
432 | typedef double tstamp; |
769 | typedef double tstamp; |
433 | |
770 | |
434 | // return current time as timestampe |
771 | // return current time as timestamp |
435 | tstamp now (); |
772 | tstamp now (); |
436 | |
773 | |
437 | int similar_direction (int a, int b); |
774 | int similar_direction (int a, int b); |
438 | |
775 | |
|
|
776 | // like v?sprintf, but returns a "static" buffer |
|
|
777 | char *vformat (const char *format, va_list ap); |
|
|
778 | char *format (const char *format, ...) ecb_attribute ((format (printf, 1, 2))); |
|
|
779 | |
|
|
780 | // safety-check player input which will become object->msg |
|
|
781 | bool msg_is_safe (const char *msg); |
|
|
782 | |
|
|
783 | ///////////////////////////////////////////////////////////////////////////// |
|
|
784 | // threads, very very thin wrappers around pthreads |
|
|
785 | |
|
|
786 | struct thread |
|
|
787 | { |
|
|
788 | pthread_t id; |
|
|
789 | |
|
|
790 | void start (void *(*start_routine)(void *), void *arg = 0); |
|
|
791 | |
|
|
792 | void cancel () |
|
|
793 | { |
|
|
794 | pthread_cancel (id); |
|
|
795 | } |
|
|
796 | |
|
|
797 | void *join () |
|
|
798 | { |
|
|
799 | void *ret; |
|
|
800 | |
|
|
801 | if (pthread_join (id, &ret)) |
|
|
802 | cleanup ("pthread_join failed", 1); |
|
|
803 | |
|
|
804 | return ret; |
|
|
805 | } |
|
|
806 | }; |
|
|
807 | |
|
|
808 | // note that mutexes are not classes |
|
|
809 | typedef pthread_mutex_t smutex; |
|
|
810 | |
|
|
811 | #if __linux && defined (PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP) |
|
|
812 | #define SMUTEX_INITIALISER PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP |
|
|
813 | #else |
|
|
814 | #define SMUTEX_INITIALISER PTHREAD_MUTEX_INITIALIZER |
439 | #endif |
815 | #endif |
440 | |
816 | |
|
|
817 | #define SMUTEX(name) smutex name = SMUTEX_INITIALISER |
|
|
818 | #define SMUTEX_LOCK(name) pthread_mutex_lock (&(name)) |
|
|
819 | #define SMUTEX_UNLOCK(name) pthread_mutex_unlock (&(name)) |
|
|
820 | |
|
|
821 | typedef pthread_cond_t scond; |
|
|
822 | |
|
|
823 | #define SCOND(name) scond name = PTHREAD_COND_INITIALIZER |
|
|
824 | #define SCOND_SIGNAL(name) pthread_cond_signal (&(name)) |
|
|
825 | #define SCOND_BROADCAST(name) pthread_cond_broadcast (&(name)) |
|
|
826 | #define SCOND_WAIT(name,mutex) pthread_cond_wait (&(name), &(mutex)) |
|
|
827 | |
|
|
828 | #endif |
|
|
829 | |