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1 | /* |
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2 | * This file is part of Deliantra, the Roguelike Realtime MMORPG. |
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3 | * |
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4 | * Copyright (©) 2005,2006,2007 Marc Alexander Lehmann / Robin Redeker / the Deliantra team |
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5 | * |
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6 | * Deliantra is free software: you can redistribute it and/or modify |
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7 | * it under the terms of the GNU General Public License as published by |
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8 | * the Free Software Foundation, either version 3 of the License, or |
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9 | * (at your option) any later version. |
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10 | * |
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11 | * This program is distributed in the hope that it will be useful, |
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12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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14 | * GNU General Public License for more details. |
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15 | * |
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16 | * You should have received a copy of the GNU General Public License |
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17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
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18 | * |
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19 | * The authors can be reached via e-mail to <support@deliantra.net> |
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20 | */ |
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21 | |
| 1 | #ifndef UTIL_H__ |
22 | #ifndef UTIL_H__ |
| 2 | #define UTIL_H__ |
23 | #define UTIL_H__ |
| 3 | |
24 | |
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25 | #define DEBUG_POISON 0x00 // poison memory before freeing it if != 0 |
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26 | #define DEBUG_SALLOC 0 // add a debug wrapper around all sallocs |
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27 | #define PREFER_MALLOC 0 // use malloc and not the slice allocator |
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28 | |
| 4 | #if __GNUC__ >= 3 |
29 | #if __GNUC__ >= 3 |
| 5 | # define is_constant(c) __builtin_constant_p (c) |
30 | # define is_constant(c) __builtin_constant_p (c) |
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31 | # define expect(expr,value) __builtin_expect ((expr),(value)) |
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32 | # define prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) |
| 6 | #else |
33 | #else |
| 7 | # define is_constant(c) 0 |
34 | # define is_constant(c) 0 |
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35 | # define expect(expr,value) (expr) |
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36 | # define prefetch(addr,rw,locality) |
| 8 | #endif |
37 | #endif |
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38 | |
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39 | #if __GNUC__ < 4 || (__GNUC__ == 4 || __GNUC_MINOR__ < 4) |
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40 | # define decltype(x) typeof(x) |
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41 | #endif |
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42 | |
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43 | // put into ifs if you are very sure that the expression |
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44 | // is mostly true or mosty false. note that these return |
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45 | // booleans, not the expression. |
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46 | #define expect_false(expr) expect ((expr) != 0, 0) |
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47 | #define expect_true(expr) expect ((expr) != 0, 1) |
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48 | |
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49 | #include <pthread.h> |
| 9 | |
50 | |
| 10 | #include <cstddef> |
51 | #include <cstddef> |
| 11 | #include <cmath> |
52 | #include <cmath> |
| 12 | #include <new> |
53 | #include <new> |
| 13 | #include <vector> |
54 | #include <vector> |
| … | |
… | |
| 15 | #include <glib.h> |
56 | #include <glib.h> |
| 16 | |
57 | |
| 17 | #include <shstr.h> |
58 | #include <shstr.h> |
| 18 | #include <traits.h> |
59 | #include <traits.h> |
| 19 | |
60 | |
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61 | #if DEBUG_SALLOC |
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62 | # define g_slice_alloc0(s) debug_slice_alloc0(s) |
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63 | # define g_slice_alloc(s) debug_slice_alloc(s) |
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64 | # define g_slice_free1(s,p) debug_slice_free1(s,p) |
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65 | void *g_slice_alloc (unsigned long size); |
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66 | void *g_slice_alloc0 (unsigned long size); |
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67 | void g_slice_free1 (unsigned long size, void *ptr); |
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68 | #elif PREFER_MALLOC |
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69 | # define g_slice_alloc0(s) calloc (1, (s)) |
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70 | # define g_slice_alloc(s) malloc ((s)) |
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71 | # define g_slice_free1(s,p) free ((p)) |
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72 | #endif |
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73 | |
| 20 | // use a gcc extension for auto declarations until ISO C++ sanctifies them |
74 | // use C0X decltype for auto declarations until ISO C++ sanctifies them (if ever) |
| 21 | #define AUTODECL(var,expr) typeof(expr) var = (expr) |
75 | #define auto(var,expr) decltype(expr) var = (expr) |
| 22 | |
76 | |
| 23 | // very ugly macro that basicaly declares and initialises a variable |
77 | // very ugly macro that basicaly declares and initialises a variable |
| 24 | // that is in scope for the next statement only |
78 | // that is in scope for the next statement only |
| 25 | // works only for stuff that can be assigned 0 and converts to false |
79 | // works only for stuff that can be assigned 0 and converts to false |
| 26 | // (note: works great for pointers) |
80 | // (note: works great for pointers) |
| 27 | // most ugly macro I ever wrote |
81 | // most ugly macro I ever wrote |
| 28 | #define declvar(type, name, value) if (type name = 0) { } else if (((name) = (value)), 1) |
82 | #define statementvar(type, name, value) if (type name = 0) { } else if (((name) = (value)), 1) |
| 29 | |
83 | |
| 30 | // in range including end |
84 | // in range including end |
| 31 | #define IN_RANGE_INC(val,beg,end) \ |
85 | #define IN_RANGE_INC(val,beg,end) \ |
| 32 | ((unsigned int)(val) - (unsigned int)(beg) <= (unsigned int)(end) - (unsigned int)(beg)) |
86 | ((unsigned int)(val) - (unsigned int)(beg) <= (unsigned int)(end) - (unsigned int)(beg)) |
| 33 | |
87 | |
| 34 | // in range excluding end |
88 | // in range excluding end |
| 35 | #define IN_RANGE_EXC(val,beg,end) \ |
89 | #define IN_RANGE_EXC(val,beg,end) \ |
| 36 | ((unsigned int)(val) - (unsigned int)(beg) < (unsigned int)(end) - (unsigned int)(beg)) |
90 | ((unsigned int)(val) - (unsigned int)(beg) < (unsigned int)(end) - (unsigned int)(beg)) |
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91 | |
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92 | void cleanup (const char *cause, bool make_core = false); |
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93 | void fork_abort (const char *msg); |
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94 | |
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95 | // rationale for using (U) not (T) is to reduce signed/unsigned issues, |
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96 | // as a is often a constant while b is the variable. it is still a bug, though. |
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97 | template<typename T, typename U> static inline T min (T a, U b) { return (U)a < b ? (U)a : b; } |
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98 | template<typename T, typename U> static inline T max (T a, U b) { return (U)a > b ? (U)a : b; } |
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99 | template<typename T, typename U, typename V> static inline T clamp (T v, U a, V b) { return v < (T)a ? (T)a : v >(T)b ? (T)b : v; } |
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100 | |
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101 | template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; } |
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102 | |
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103 | 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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104 | 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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105 | |
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106 | template<typename T> |
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107 | static inline T |
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108 | lerp (T val, T min_in, T max_in, T min_out, T max_out) |
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109 | { |
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110 | return (val - min_in) * (max_out - min_out) / (max_in - min_in) + min_out; |
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111 | } |
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112 | |
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113 | // lots of stuff taken from FXT |
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114 | |
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115 | /* Rotate right. This is used in various places for checksumming */ |
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116 | //TODO: that sucks, use a better checksum algo |
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117 | static inline uint32_t |
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118 | rotate_right (uint32_t c, uint32_t count = 1) |
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119 | { |
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120 | return (c << (32 - count)) | (c >> count); |
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121 | } |
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122 | |
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123 | static inline uint32_t |
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124 | rotate_left (uint32_t c, uint32_t count = 1) |
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125 | { |
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126 | return (c >> (32 - count)) | (c << count); |
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127 | } |
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128 | |
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129 | // Return abs(a-b) |
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130 | // Both a and b must not have the most significant bit set |
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131 | static inline uint32_t |
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132 | upos_abs_diff (uint32_t a, uint32_t b) |
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133 | { |
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134 | long d1 = b - a; |
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135 | long d2 = (d1 & (d1 >> 31)) << 1; |
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136 | |
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137 | return d1 - d2; // == (b - d) - (a + d); |
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138 | } |
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139 | |
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140 | // Both a and b must not have the most significant bit set |
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141 | static inline uint32_t |
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142 | upos_min (uint32_t a, uint32_t b) |
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143 | { |
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144 | int32_t d = b - a; |
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145 | d &= d >> 31; |
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146 | return a + d; |
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147 | } |
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148 | |
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149 | // Both a and b must not have the most significant bit set |
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150 | static inline uint32_t |
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151 | upos_max (uint32_t a, uint32_t b) |
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152 | { |
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153 | int32_t d = b - a; |
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154 | d &= d >> 31; |
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155 | return b - d; |
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156 | } |
| 37 | |
157 | |
| 38 | // this is much faster than crossfires original algorithm |
158 | // this is much faster than crossfires original algorithm |
| 39 | // on modern cpus |
159 | // on modern cpus |
| 40 | inline int |
160 | inline int |
| 41 | isqrt (int n) |
161 | isqrt (int n) |
| … | |
… | |
| 58 | #if 0 |
178 | #if 0 |
| 59 | return dx_ > dy_ |
179 | return dx_ > dy_ |
| 60 | ? (dx_ * 61685 + dy_ * 26870) >> 16 |
180 | ? (dx_ * 61685 + dy_ * 26870) >> 16 |
| 61 | : (dy_ * 61685 + dx_ * 26870) >> 16; |
181 | : (dy_ * 61685 + dx_ * 26870) >> 16; |
| 62 | #else |
182 | #else |
| 63 | return dx + dy - min (dx, dy) * 5 / 8; |
183 | return dx_ + dy_ - min (dx_, dy_) * 5 / 8; |
| 64 | #endif |
184 | #endif |
| 65 | } |
185 | } |
| 66 | |
186 | |
| 67 | |
187 | /* |
| 68 | // makes dynamically allocated objects zero-initialised |
188 | * absdir(int): Returns a number between 1 and 8, which represent |
| 69 | struct zero_initialised |
189 | * the "absolute" direction of a number (it actually takes care of |
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190 | * "overflow" in previous calculations of a direction). |
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191 | */ |
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192 | inline int |
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193 | absdir (int d) |
| 70 | { |
194 | { |
| 71 | void *operator new (size_t s, void *p) |
195 | return ((d - 1) & 7) + 1; |
| 72 | { |
196 | } |
| 73 | memset (p, 0, s); |
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| 74 | return p; |
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| 75 | } |
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| 76 | |
197 | |
| 77 | void *operator new (size_t s) |
198 | extern ssize_t slice_alloc; // statistics |
| 78 | { |
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| 79 | return g_slice_alloc0 (s); |
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| 80 | } |
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| 81 | |
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| 82 | void *operator new[] (size_t s) |
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| 83 | { |
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| 84 | return g_slice_alloc0 (s); |
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| 85 | } |
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| 86 | |
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| 87 | void operator delete (void *p, size_t s) |
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| 88 | { |
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| 89 | g_slice_free1 (s, p); |
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| 90 | } |
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| 91 | |
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| 92 | void operator delete[] (void *p, size_t s) |
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| 93 | { |
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| 94 | g_slice_free1 (s, p); |
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| 95 | } |
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| 96 | }; |
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| 97 | |
199 | |
| 98 | void *salloc_ (int n) throw (std::bad_alloc); |
200 | void *salloc_ (int n) throw (std::bad_alloc); |
| 99 | void *salloc_ (int n, void *src) throw (std::bad_alloc); |
201 | void *salloc_ (int n, void *src) throw (std::bad_alloc); |
| 100 | |
202 | |
| 101 | // strictly the same as g_slice_alloc, but never returns 0 |
203 | // strictly the same as g_slice_alloc, but never returns 0 |
| … | |
… | |
| 113 | |
215 | |
| 114 | // for symmetry |
216 | // for symmetry |
| 115 | template<typename T> |
217 | template<typename T> |
| 116 | inline void sfree (T *ptr, int n = 1) throw () |
218 | inline void sfree (T *ptr, int n = 1) throw () |
| 117 | { |
219 | { |
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220 | if (expect_true (ptr)) |
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221 | { |
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222 | slice_alloc -= n * sizeof (T); |
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223 | if (DEBUG_POISON) memset (ptr, DEBUG_POISON, n * sizeof (T)); |
| 118 | g_slice_free1 (n * sizeof (T), (void *)ptr); |
224 | g_slice_free1 (n * sizeof (T), (void *)ptr); |
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225 | assert (slice_alloc >= 0);//D |
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226 | } |
| 119 | } |
227 | } |
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228 | |
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229 | // nulls the pointer |
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230 | template<typename T> |
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231 | inline void sfree0 (T *&ptr, int n = 1) throw () |
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232 | { |
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233 | sfree<T> (ptr, n); |
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234 | ptr = 0; |
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235 | } |
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236 | |
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237 | // makes dynamically allocated objects zero-initialised |
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238 | struct zero_initialised |
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239 | { |
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240 | void *operator new (size_t s, void *p) |
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241 | { |
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242 | memset (p, 0, s); |
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243 | return p; |
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244 | } |
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245 | |
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246 | void *operator new (size_t s) |
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247 | { |
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248 | return salloc0<char> (s); |
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249 | } |
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250 | |
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251 | void *operator new[] (size_t s) |
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252 | { |
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253 | return salloc0<char> (s); |
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254 | } |
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255 | |
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256 | void operator delete (void *p, size_t s) |
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257 | { |
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258 | sfree ((char *)p, s); |
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259 | } |
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260 | |
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261 | void operator delete[] (void *p, size_t s) |
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262 | { |
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263 | sfree ((char *)p, s); |
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264 | } |
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265 | }; |
| 120 | |
266 | |
| 121 | // a STL-compatible allocator that uses g_slice |
267 | // a STL-compatible allocator that uses g_slice |
| 122 | // boy, this is verbose |
268 | // boy, this is verbose |
| 123 | template<typename Tp> |
269 | template<typename Tp> |
| 124 | struct slice_allocator |
270 | struct slice_allocator |
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… | |
| 136 | { |
282 | { |
| 137 | typedef slice_allocator<U> other; |
283 | typedef slice_allocator<U> other; |
| 138 | }; |
284 | }; |
| 139 | |
285 | |
| 140 | slice_allocator () throw () { } |
286 | slice_allocator () throw () { } |
| 141 | slice_allocator (const slice_allocator &o) throw () { } |
287 | slice_allocator (const slice_allocator &) throw () { } |
| 142 | template<typename Tp2> |
288 | template<typename Tp2> |
| 143 | slice_allocator (const slice_allocator<Tp2> &) throw () { } |
289 | slice_allocator (const slice_allocator<Tp2> &) throw () { } |
| 144 | |
290 | |
| 145 | ~slice_allocator () { } |
291 | ~slice_allocator () { } |
| 146 | |
292 | |
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| 155 | void deallocate (pointer p, size_type n) |
301 | void deallocate (pointer p, size_type n) |
| 156 | { |
302 | { |
| 157 | sfree<Tp> (p, n); |
303 | sfree<Tp> (p, n); |
| 158 | } |
304 | } |
| 159 | |
305 | |
| 160 | size_type max_size ()const throw () |
306 | size_type max_size () const throw () |
| 161 | { |
307 | { |
| 162 | return size_t (-1) / sizeof (Tp); |
308 | return size_t (-1) / sizeof (Tp); |
| 163 | } |
309 | } |
| 164 | |
310 | |
| 165 | void construct (pointer p, const Tp &val) |
311 | void construct (pointer p, const Tp &val) |
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| 170 | void destroy (pointer p) |
316 | void destroy (pointer p) |
| 171 | { |
317 | { |
| 172 | p->~Tp (); |
318 | p->~Tp (); |
| 173 | } |
319 | } |
| 174 | }; |
320 | }; |
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321 | |
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322 | // P. L'Ecuyer, “Maximally Equidistributed Combined Tausworthe Generators”, Mathematics of Computation, 65, 213 (1996), 203–213. |
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323 | // http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme.ps |
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324 | // http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme2.ps |
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325 | struct tausworthe_random_generator |
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326 | { |
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327 | // generator |
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328 | uint32_t state [4]; |
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329 | |
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330 | void operator =(const tausworthe_random_generator &src) |
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331 | { |
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332 | state [0] = src.state [0]; |
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333 | state [1] = src.state [1]; |
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334 | state [2] = src.state [2]; |
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335 | state [3] = src.state [3]; |
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336 | } |
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337 | |
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338 | void seed (uint32_t seed); |
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339 | uint32_t next (); |
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340 | |
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341 | // uniform distribution |
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342 | uint32_t operator ()(uint32_t num) |
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343 | { |
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344 | return is_constant (num) |
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345 | ? (next () * (uint64_t)num) >> 32U |
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346 | : get_range (num); |
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347 | } |
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348 | |
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349 | // return a number within (min .. max) |
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350 | int operator () (int r_min, int r_max) |
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351 | { |
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352 | return is_constant (r_min) && is_constant (r_max) && r_min <= r_max |
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353 | ? r_min + operator ()(r_max - r_min + 1) |
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354 | : get_range (r_min, r_max); |
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355 | } |
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356 | |
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357 | double operator ()() |
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358 | { |
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359 | return this->next () / (double)0xFFFFFFFFU; |
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360 | } |
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361 | |
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362 | protected: |
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363 | uint32_t get_range (uint32_t r_max); |
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364 | int get_range (int r_min, int r_max); |
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365 | }; |
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366 | |
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367 | typedef tausworthe_random_generator rand_gen; |
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368 | |
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369 | extern rand_gen rndm; |
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370 | |
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371 | INTERFACE_CLASS (attachable) |
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372 | struct refcnt_base |
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373 | { |
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374 | typedef int refcnt_t; |
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375 | mutable refcnt_t ACC (RW, refcnt); |
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376 | |
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377 | MTH void refcnt_inc () const { ++refcnt; } |
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378 | MTH void refcnt_dec () const { --refcnt; } |
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379 | |
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380 | refcnt_base () : refcnt (0) { } |
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381 | }; |
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382 | |
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383 | // to avoid branches with more advanced compilers |
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384 | extern refcnt_base::refcnt_t refcnt_dummy; |
| 175 | |
385 | |
| 176 | template<class T> |
386 | template<class T> |
| 177 | struct refptr |
387 | struct refptr |
| 178 | { |
388 | { |
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389 | // p if not null |
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390 | refcnt_base::refcnt_t *refcnt_ref () { return p ? &p->refcnt : &refcnt_dummy; } |
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391 | |
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392 | void refcnt_dec () |
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393 | { |
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394 | if (!is_constant (p)) |
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395 | --*refcnt_ref (); |
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396 | else if (p) |
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397 | --p->refcnt; |
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398 | } |
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399 | |
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400 | void refcnt_inc () |
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401 | { |
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402 | if (!is_constant (p)) |
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403 | ++*refcnt_ref (); |
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404 | else if (p) |
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405 | ++p->refcnt; |
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406 | } |
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407 | |
| 179 | T *p; |
408 | T *p; |
| 180 | |
409 | |
| 181 | refptr () : p(0) { } |
410 | refptr () : p(0) { } |
| 182 | refptr (const refptr<T> &p) : p(p.p) { if (p) p->refcnt_inc (); } |
411 | refptr (const refptr<T> &p) : p(p.p) { refcnt_inc (); } |
| 183 | refptr (T *p) : p(p) { if (p) p->refcnt_inc (); } |
412 | refptr (T *p) : p(p) { refcnt_inc (); } |
| 184 | ~refptr () { if (p) p->refcnt_dec (); } |
413 | ~refptr () { refcnt_dec (); } |
| 185 | |
414 | |
| 186 | const refptr<T> &operator =(T *o) |
415 | const refptr<T> &operator =(T *o) |
| 187 | { |
416 | { |
|
|
417 | // if decrementing ever destroys we need to reverse the order here |
| 188 | if (p) p->refcnt_dec (); |
418 | refcnt_dec (); |
| 189 | p = o; |
419 | p = o; |
| 190 | if (p) p->refcnt_inc (); |
420 | refcnt_inc (); |
| 191 | |
|
|
| 192 | return *this; |
421 | return *this; |
| 193 | } |
422 | } |
| 194 | |
423 | |
| 195 | const refptr<T> &operator =(const refptr<T> o) |
424 | const refptr<T> &operator =(const refptr<T> &o) |
| 196 | { |
425 | { |
| 197 | *this = o.p; |
426 | *this = o.p; |
| 198 | return *this; |
427 | return *this; |
| 199 | } |
428 | } |
| 200 | |
429 | |
| 201 | T &operator * () const { return *p; } |
430 | T &operator * () const { return *p; } |
| 202 | T *operator ->() const { return p; } |
431 | T *operator ->() const { return p; } |
| 203 | |
432 | |
| 204 | operator T *() const { return p; } |
433 | operator T *() const { return p; } |
| 205 | }; |
434 | }; |
| 206 | |
435 | |
| 207 | typedef refptr<maptile> maptile_ptr; |
436 | typedef refptr<maptile> maptile_ptr; |
| … | |
… | |
| 242 | { |
471 | { |
| 243 | return !strcmp (a, b); |
472 | return !strcmp (a, b); |
| 244 | } |
473 | } |
| 245 | }; |
474 | }; |
| 246 | |
475 | |
|
|
476 | // Mostly the same as std::vector, but insert/erase can reorder |
|
|
477 | // the elements, making append(=insert)/remove O(1) instead of O(n). |
|
|
478 | // |
|
|
479 | // NOTE: only some forms of erase are available |
| 247 | template<class T> |
480 | template<class T> |
| 248 | struct unordered_vector : std::vector<T, slice_allocator<T> > |
481 | struct unordered_vector : std::vector<T, slice_allocator<T> > |
| 249 | { |
482 | { |
| 250 | typedef typename unordered_vector::iterator iterator; |
483 | typedef typename unordered_vector::iterator iterator; |
| 251 | |
484 | |
| … | |
… | |
| 261 | { |
494 | { |
| 262 | erase ((unsigned int )(i - this->begin ())); |
495 | erase ((unsigned int )(i - this->begin ())); |
| 263 | } |
496 | } |
| 264 | }; |
497 | }; |
| 265 | |
498 | |
| 266 | template<class T, int T::* index> |
499 | // This container blends advantages of linked lists |
|
|
500 | // (efficiency) with vectors (random access) by |
|
|
501 | // by using an unordered vector and storing the vector |
|
|
502 | // index inside the object. |
|
|
503 | // |
|
|
504 | // + memory-efficient on most 64 bit archs |
|
|
505 | // + O(1) insert/remove |
|
|
506 | // + free unique (but varying) id for inserted objects |
|
|
507 | // + cache-friendly iteration |
|
|
508 | // - only works for pointers to structs |
|
|
509 | // |
|
|
510 | // NOTE: only some forms of erase/insert are available |
|
|
511 | typedef int object_vector_index; |
|
|
512 | |
|
|
513 | template<class T, object_vector_index T::*indexmember> |
| 267 | struct object_vector : std::vector<T *, slice_allocator<T *> > |
514 | struct object_vector : std::vector<T *, slice_allocator<T *> > |
| 268 | { |
515 | { |
|
|
516 | typedef typename object_vector::iterator iterator; |
|
|
517 | |
|
|
518 | bool contains (const T *obj) const |
|
|
519 | { |
|
|
520 | return obj->*indexmember; |
|
|
521 | } |
|
|
522 | |
|
|
523 | iterator find (const T *obj) |
|
|
524 | { |
|
|
525 | return obj->*indexmember |
|
|
526 | ? this->begin () + obj->*indexmember - 1 |
|
|
527 | : this->end (); |
|
|
528 | } |
|
|
529 | |
|
|
530 | void push_back (T *obj) |
|
|
531 | { |
|
|
532 | std::vector<T *, slice_allocator<T *> >::push_back (obj); |
|
|
533 | obj->*indexmember = this->size (); |
|
|
534 | } |
|
|
535 | |
| 269 | void insert (T *obj) |
536 | void insert (T *obj) |
| 270 | { |
537 | { |
| 271 | assert (!(obj->*index)); |
|
|
| 272 | push_back (obj); |
538 | push_back (obj); |
| 273 | obj->*index = this->size (); |
|
|
| 274 | } |
539 | } |
| 275 | |
540 | |
| 276 | void insert (T &obj) |
541 | void insert (T &obj) |
| 277 | { |
542 | { |
| 278 | insert (&obj); |
543 | insert (&obj); |
| 279 | } |
544 | } |
| 280 | |
545 | |
| 281 | void erase (T *obj) |
546 | void erase (T *obj) |
| 282 | { |
547 | { |
| 283 | assert (obj->*index); |
|
|
| 284 | int pos = obj->*index; |
548 | unsigned int pos = obj->*indexmember; |
| 285 | obj->*index = 0; |
549 | obj->*indexmember = 0; |
| 286 | |
550 | |
| 287 | if (pos < this->size ()) |
551 | if (pos < this->size ()) |
| 288 | { |
552 | { |
| 289 | (*this)[pos - 1] = (*this)[this->size () - 1]; |
553 | (*this)[pos - 1] = (*this)[this->size () - 1]; |
| 290 | (*this)[pos - 1]->*index = pos; |
554 | (*this)[pos - 1]->*indexmember = pos; |
| 291 | } |
555 | } |
| 292 | |
556 | |
| 293 | this->pop_back (); |
557 | this->pop_back (); |
| 294 | } |
558 | } |
| 295 | |
559 | |
| 296 | void erase (T &obj) |
560 | void erase (T &obj) |
| 297 | { |
561 | { |
| 298 | errase (&obj); |
562 | erase (&obj); |
| 299 | } |
563 | } |
| 300 | }; |
564 | }; |
| 301 | |
|
|
| 302 | template<typename T, typename U> static inline T min (T a, U b) { return a < (T)b ? a : (T)b; } |
|
|
| 303 | template<typename T, typename U> static inline T max (T a, U b) { return a > (T)b ? a : (T)b; } |
|
|
| 304 | template<typename T, typename U, typename V> static inline T clamp (T v, U a, V b) { return v < (T)a ? a : v >(T)b ? b : v; } |
|
|
| 305 | |
|
|
| 306 | template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; } |
|
|
| 307 | |
565 | |
| 308 | // basically does what strncpy should do, but appends "..." to strings exceeding length |
566 | // basically does what strncpy should do, but appends "..." to strings exceeding length |
| 309 | void assign (char *dst, const char *src, int maxlen); |
567 | void assign (char *dst, const char *src, int maxlen); |
| 310 | |
568 | |
| 311 | // type-safe version of assign |
569 | // type-safe version of assign |
| … | |
… | |
| 315 | assign ((char *)&dst, src, N); |
573 | assign ((char *)&dst, src, N); |
| 316 | } |
574 | } |
| 317 | |
575 | |
| 318 | typedef double tstamp; |
576 | typedef double tstamp; |
| 319 | |
577 | |
| 320 | // return current time as timestampe |
578 | // return current time as timestamp |
| 321 | tstamp now (); |
579 | tstamp now (); |
| 322 | |
580 | |
| 323 | int similar_direction (int a, int b); |
581 | int similar_direction (int a, int b); |
| 324 | |
582 | |
|
|
583 | // like sprintf, but returns a "static" buffer |
|
|
584 | const char *format (const char *format, ...); |
|
|
585 | |
|
|
586 | ///////////////////////////////////////////////////////////////////////////// |
|
|
587 | // threads, very very thin wrappers around pthreads |
|
|
588 | |
|
|
589 | struct thread |
|
|
590 | { |
|
|
591 | pthread_t id; |
|
|
592 | |
|
|
593 | void start (void *(*start_routine)(void *), void *arg = 0); |
|
|
594 | |
|
|
595 | void cancel () |
|
|
596 | { |
|
|
597 | pthread_cancel (id); |
|
|
598 | } |
|
|
599 | |
|
|
600 | void *join () |
|
|
601 | { |
|
|
602 | void *ret; |
|
|
603 | |
|
|
604 | if (pthread_join (id, &ret)) |
|
|
605 | cleanup ("pthread_join failed", 1); |
|
|
606 | |
|
|
607 | return ret; |
|
|
608 | } |
|
|
609 | }; |
|
|
610 | |
|
|
611 | // note that mutexes are not classes |
|
|
612 | typedef pthread_mutex_t smutex; |
|
|
613 | |
|
|
614 | #if __linux && defined (PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP) |
|
|
615 | #define SMUTEX_INITIALISER PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP |
|
|
616 | #else |
|
|
617 | #define SMUTEX_INITIALISER PTHREAD_MUTEX_INITIALIZER |
| 325 | #endif |
618 | #endif |
| 326 | |
619 | |
|
|
620 | #define SMUTEX(name) smutex name = SMUTEX_INITIALISER |
|
|
621 | #define SMUTEX_LOCK(name) pthread_mutex_lock (&(name)) |
|
|
622 | #define SMUTEX_UNLOCK(name) pthread_mutex_unlock (&(name)) |
|
|
623 | |
|
|
624 | typedef pthread_cond_t scond; |
|
|
625 | |
|
|
626 | #define SCOND(name) scond name = PTHREAD_COND_INITIALIZER |
|
|
627 | #define SCOND_SIGNAL(name) pthread_cond_signal (&(name)) |
|
|
628 | #define SCOND_BROADCAST(name) pthread_cond_broadcast (&(name)) |
|
|
629 | #define SCOND_WAIT(name,mutex) pthread_cond_wait (&(name), &(mutex)) |
|
|
630 | |
|
|
631 | #endif |
|
|
632 | |
