1 | #ifndef UTIL_H__ |
1 | #ifndef UTIL_H__ |
2 | #define UTIL_H__ |
2 | #define UTIL_H__ |
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3 | |
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4 | //#define PREFER_MALLOC |
3 | |
5 | |
4 | #if __GNUC__ >= 3 |
6 | #if __GNUC__ >= 3 |
5 | # define is_constant(c) __builtin_constant_p (c) |
7 | # define is_constant(c) __builtin_constant_p (c) |
6 | #else |
8 | #else |
7 | # define is_constant(c) 0 |
9 | # define is_constant(c) 0 |
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16 | |
18 | |
17 | #include <shstr.h> |
19 | #include <shstr.h> |
18 | #include <traits.h> |
20 | #include <traits.h> |
19 | |
21 | |
20 | // use a gcc extension for auto declarations until ISO C++ sanctifies them |
22 | // use a gcc extension for auto declarations until ISO C++ sanctifies them |
21 | #define AUTODECL(var,expr) typeof(expr) var = (expr) |
23 | #define auto(var,expr) typeof(expr) var = (expr) |
22 | |
24 | |
23 | // very ugly macro that basicaly declares and initialises a variable |
25 | // very ugly macro that basicaly declares and initialises a variable |
24 | // that is in scope for the next statement only |
26 | // that is in scope for the next statement only |
25 | // works only for stuff that can be assigned 0 and converts to false |
27 | // works only for stuff that can be assigned 0 and converts to false |
26 | // (note: works great for pointers) |
28 | // (note: works great for pointers) |
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35 | #define IN_RANGE_EXC(val,beg,end) \ |
37 | #define IN_RANGE_EXC(val,beg,end) \ |
36 | ((unsigned int)(val) - (unsigned int)(beg) < (unsigned int)(end) - (unsigned int)(beg)) |
38 | ((unsigned int)(val) - (unsigned int)(beg) < (unsigned int)(end) - (unsigned int)(beg)) |
37 | |
39 | |
38 | void fork_abort (const char *msg); |
40 | void fork_abort (const char *msg); |
39 | |
41 | |
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42 | // rationale for using (U) not (T) is to reduce signed/unsigned issues, |
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43 | // as a is often a constant while b is the variable. it is still a bug, though. |
40 | template<typename T, typename U> static inline T min (T a, U b) { return a < (T)b ? a : (T)b; } |
44 | template<typename T, typename U> static inline T min (T a, U b) { return (U)a < b ? (U)a : b; } |
41 | template<typename T, typename U> static inline T max (T a, U b) { return a > (T)b ? a : (T)b; } |
45 | template<typename T, typename U> static inline T max (T a, U b) { return (U)a > b ? (U)a : b; } |
42 | template<typename T, typename U, typename V> static inline T clamp (T v, U a, V b) { return v < (T)a ? a : v >(T)b ? b : v; } |
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; } |
43 | |
47 | |
44 | template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; } |
48 | 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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49 | |
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50 | template<typename T> |
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51 | static inline T |
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52 | lerp (T val, T min_in, T max_in, T min_out, T max_out) |
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53 | { |
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54 | return (val - min_in) * (max_out - min_out) / (max_in - min_in) + min_out; |
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55 | } |
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56 | |
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57 | // lots of stuff taken from FXT |
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58 | |
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59 | /* Rotate right. This is used in various places for checksumming */ |
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60 | //TODO: that sucks, use a better checksum algo |
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61 | static inline uint32_t |
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62 | rotate_right (uint32_t c, uint32_t count = 1) |
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63 | { |
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64 | return (c << (32 - count)) | (c >> count); |
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65 | } |
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66 | |
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67 | static inline uint32_t |
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68 | rotate_left (uint32_t c, uint32_t count = 1) |
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69 | { |
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70 | return (c >> (32 - count)) | (c << count); |
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71 | } |
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72 | |
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73 | // Return abs(a-b) |
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74 | // Both a and b must not have the most significant bit set |
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75 | static inline uint32_t |
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76 | upos_abs_diff (uint32_t a, uint32_t b) |
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77 | { |
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78 | long d1 = b - a; |
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79 | long d2 = (d1 & (d1 >> 31)) << 1; |
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80 | |
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81 | return d1 - d2; // == (b - d) - (a + d); |
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82 | } |
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83 | |
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84 | // Both a and b must not have the most significant bit set |
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85 | static inline uint32_t |
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86 | upos_min (uint32_t a, uint32_t b) |
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87 | { |
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88 | int32_t d = b - a; |
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89 | d &= d >> 31; |
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90 | return a + d; |
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91 | } |
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92 | |
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93 | // Both a and b must not have the most significant bit set |
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94 | static inline uint32_t |
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95 | upos_max (uint32_t a, uint32_t b) |
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96 | { |
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97 | int32_t d = b - a; |
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98 | d &= d >> 31; |
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99 | return b - d; |
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100 | } |
45 | |
101 | |
46 | // this is much faster than crossfires original algorithm |
102 | // this is much faster than crossfires original algorithm |
47 | // on modern cpus |
103 | // on modern cpus |
48 | inline int |
104 | inline int |
49 | isqrt (int n) |
105 | isqrt (int n) |
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131 | |
187 | |
132 | // for symmetry |
188 | // for symmetry |
133 | template<typename T> |
189 | template<typename T> |
134 | inline void sfree (T *ptr, int n = 1) throw () |
190 | inline void sfree (T *ptr, int n = 1) throw () |
135 | { |
191 | { |
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192 | #ifdef PREFER_MALLOC |
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193 | free (ptr); |
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194 | #else |
136 | g_slice_free1 (n * sizeof (T), (void *)ptr); |
195 | g_slice_free1 (n * sizeof (T), (void *)ptr); |
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196 | #endif |
137 | } |
197 | } |
138 | |
198 | |
139 | // a STL-compatible allocator that uses g_slice |
199 | // a STL-compatible allocator that uses g_slice |
140 | // boy, this is verbose |
200 | // boy, this is verbose |
141 | template<typename Tp> |
201 | template<typename Tp> |
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194 | // P. L'Ecuyer, “Maximally Equidistributed Combined Tausworthe Generators”, Mathematics of Computation, 65, 213 (1996), 203–213. |
254 | // P. L'Ecuyer, “Maximally Equidistributed Combined Tausworthe Generators”, Mathematics of Computation, 65, 213 (1996), 203–213. |
195 | // http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme.ps |
255 | // http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme.ps |
196 | // http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme2.ps |
256 | // http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme2.ps |
197 | struct tausworthe_random_generator |
257 | struct tausworthe_random_generator |
198 | { |
258 | { |
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259 | // generator |
199 | uint32_t state [4]; |
260 | uint32_t state [4]; |
200 | |
261 | |
201 | tausworthe_random_generator (uint32_t seed); |
262 | void operator =(const tausworthe_random_generator &src) |
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263 | { |
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264 | state [0] = src.state [0]; |
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265 | state [1] = src.state [1]; |
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266 | state [2] = src.state [2]; |
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267 | state [3] = src.state [3]; |
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268 | } |
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269 | |
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270 | void seed (uint32_t seed); |
202 | uint32_t next (); |
271 | uint32_t next (); |
203 | |
272 | |
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273 | // uniform distribution |
204 | uint32_t operator ()(uint32_t r_max) |
274 | uint32_t operator ()(uint32_t num) |
205 | { |
275 | { |
206 | return next () % r_max; |
276 | return is_constant (num) |
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277 | ? (next () * (uint64_t)num) >> 32U |
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278 | : get_range (num); |
207 | } |
279 | } |
208 | |
280 | |
209 | // return a number within (min .. max) |
281 | // return a number within (min .. max) |
210 | int operator () (int r_min, int r_max) |
282 | int operator () (int r_min, int r_max) |
211 | { |
283 | { |
212 | return r_min + next () % max (r_max - r_min + 1, 1); |
284 | return is_constant (r_min) && is_constant (r_max) && r_min <= r_max |
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285 | ? r_min + operator ()(r_max - r_min + 1) |
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286 | : get_range (r_min, r_max); |
213 | } |
287 | } |
214 | |
288 | |
215 | double operator ()() |
289 | double operator ()() |
216 | { |
290 | { |
217 | return next () / (double)0xFFFFFFFFU; |
291 | return this->next () / (double)0xFFFFFFFFU; |
218 | } |
292 | } |
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293 | |
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294 | protected: |
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295 | uint32_t get_range (uint32_t r_max); |
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296 | int get_range (int r_min, int r_max); |
219 | }; |
297 | }; |
220 | |
298 | |
221 | typedef tausworthe_random_generator rand_gen; |
299 | typedef tausworthe_random_generator rand_gen; |
222 | |
300 | |
223 | extern rand_gen rndm; |
301 | extern rand_gen rndm; |
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328 | } |
406 | } |
329 | |
407 | |
330 | void erase (T *obj) |
408 | void erase (T *obj) |
331 | { |
409 | { |
332 | assert (obj->*index); |
410 | assert (obj->*index); |
333 | int pos = obj->*index; |
411 | unsigned int pos = obj->*index; |
334 | obj->*index = 0; |
412 | obj->*index = 0; |
335 | |
413 | |
336 | if (pos < this->size ()) |
414 | if (pos < this->size ()) |
337 | { |
415 | { |
338 | (*this)[pos - 1] = (*this)[this->size () - 1]; |
416 | (*this)[pos - 1] = (*this)[this->size () - 1]; |
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363 | // return current time as timestampe |
441 | // return current time as timestampe |
364 | tstamp now (); |
442 | tstamp now (); |
365 | |
443 | |
366 | int similar_direction (int a, int b); |
444 | int similar_direction (int a, int b); |
367 | |
445 | |
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446 | // like printf, but returns a std::string |
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447 | const std::string format (const char *format, ...); |
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448 | |
368 | #endif |
449 | #endif |
369 | |
450 | |