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/* |
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* This file is part of Deliantra, the Roguelike Realtime MMORPG. |
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* |
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* Copyright (©) 2005,2006,2007 Marc Alexander Lehmann / Robin Redeker / the Deliantra team |
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* |
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* Deliantra is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation, either version 3 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program. If not, see <http://www.gnu.org/licenses/>. |
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* |
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* The authors can be reached via e-mail to <support@deliantra.net> |
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*/ |
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|
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#ifndef UTIL_H__ |
23 |
#define UTIL_H__ |
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|
25 |
#define DEBUG_POISON 0x00 // poison memory before freeing it if != 0 |
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#define DEBUG_SALLOC 0 // add a debug wrapper around all sallocs |
27 |
#define PREFER_MALLOC 0 // use malloc and not the slice allocator |
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|
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#if __GNUC__ >= 3 |
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# define is_constant(c) __builtin_constant_p (c) |
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# define expect(expr,value) __builtin_expect ((expr),(value)) |
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# define prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) |
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#else |
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# define is_constant(c) 0 |
35 |
# define expect(expr,value) (expr) |
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# define prefetch(addr,rw,locality) |
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#endif |
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|
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#if __GNUC__ < 4 || (__GNUC__ == 4 || __GNUC_MINOR__ < 4) |
40 |
# define decltype(x) typeof(x) |
41 |
#endif |
42 |
|
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// put into ifs if you are very sure that the expression |
44 |
// is mostly true or mosty false. note that these return |
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// booleans, not the expression. |
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#define expect_false(expr) expect ((expr) != 0, 0) |
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#define expect_true(expr) expect ((expr) != 0, 1) |
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|
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#include <pthread.h> |
50 |
|
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#include <cstddef> |
52 |
#include <cmath> |
53 |
#include <new> |
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#include <vector> |
55 |
|
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#include <glib.h> |
57 |
|
58 |
#include <shstr.h> |
59 |
#include <traits.h> |
60 |
|
61 |
#if DEBUG_SALLOC |
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# define g_slice_alloc0(s) debug_slice_alloc0(s) |
63 |
# define g_slice_alloc(s) debug_slice_alloc(s) |
64 |
# define g_slice_free1(s,p) debug_slice_free1(s,p) |
65 |
void *g_slice_alloc (unsigned long size); |
66 |
void *g_slice_alloc0 (unsigned long size); |
67 |
void g_slice_free1 (unsigned long size, void *ptr); |
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#elif PREFER_MALLOC |
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# define g_slice_alloc0(s) calloc (1, (s)) |
70 |
# define g_slice_alloc(s) malloc ((s)) |
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# define g_slice_free1(s,p) free ((p)) |
72 |
#endif |
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|
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// use C0X decltype for auto declarations until ISO C++ sanctifies them (if ever) |
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#define auto(var,expr) decltype(expr) var = (expr) |
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|
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// very ugly macro that basicaly declares and initialises a variable |
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// that is in scope for the next statement only |
79 |
// works only for stuff that can be assigned 0 and converts to false |
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// (note: works great for pointers) |
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// most ugly macro I ever wrote |
82 |
#define statementvar(type, name, value) if (type name = 0) { } else if (((name) = (value)), 1) |
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|
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// in range including end |
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#define IN_RANGE_INC(val,beg,end) \ |
86 |
((unsigned int)(val) - (unsigned int)(beg) <= (unsigned int)(end) - (unsigned int)(beg)) |
87 |
|
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// in range excluding end |
89 |
#define IN_RANGE_EXC(val,beg,end) \ |
90 |
((unsigned int)(val) - (unsigned int)(beg) < (unsigned int)(end) - (unsigned int)(beg)) |
91 |
|
92 |
void cleanup (const char *cause, bool make_core = false); |
93 |
void fork_abort (const char *msg); |
94 |
|
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// rationale for using (U) not (T) is to reduce signed/unsigned issues, |
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// as a is often a constant while b is the variable. it is still a bug, though. |
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template<typename T, typename U> static inline T min (T a, U b) { return (U)a < b ? (U)a : b; } |
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template<typename T, typename U> static inline T max (T a, U b) { return (U)a > b ? (U)a : b; } |
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template<typename T, typename U, typename V> static inline T clamp (T v, U a, V b) { return v < (T)a ? (T)a : v >(T)b ? (T)b : v; } |
100 |
|
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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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|
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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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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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|
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template<typename T> |
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static inline T |
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lerp (T val, T min_in, T max_in, T min_out, T max_out) |
109 |
{ |
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return (val - min_in) * (max_out - min_out) / (max_in - min_in) + min_out; |
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} |
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|
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// lots of stuff taken from FXT |
114 |
|
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/* Rotate right. This is used in various places for checksumming */ |
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//TODO: that sucks, use a better checksum algo |
117 |
static inline uint32_t |
118 |
rotate_right (uint32_t c, uint32_t count = 1) |
119 |
{ |
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return (c << (32 - count)) | (c >> count); |
121 |
} |
122 |
|
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static inline uint32_t |
124 |
rotate_left (uint32_t c, uint32_t count = 1) |
125 |
{ |
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return (c >> (32 - count)) | (c << count); |
127 |
} |
128 |
|
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// Return abs(a-b) |
130 |
// Both a and b must not have the most significant bit set |
131 |
static inline uint32_t |
132 |
upos_abs_diff (uint32_t a, uint32_t b) |
133 |
{ |
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long d1 = b - a; |
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long d2 = (d1 & (d1 >> 31)) << 1; |
136 |
|
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return d1 - d2; // == (b - d) - (a + d); |
138 |
} |
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|
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// Both a and b must not have the most significant bit set |
141 |
static inline uint32_t |
142 |
upos_min (uint32_t a, uint32_t b) |
143 |
{ |
144 |
int32_t d = b - a; |
145 |
d &= d >> 31; |
146 |
return a + d; |
147 |
} |
148 |
|
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// Both a and b must not have the most significant bit set |
150 |
static inline uint32_t |
151 |
upos_max (uint32_t a, uint32_t b) |
152 |
{ |
153 |
int32_t d = b - a; |
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d &= d >> 31; |
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return b - d; |
156 |
} |
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|
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// this is much faster than crossfires original algorithm |
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// on modern cpus |
160 |
inline int |
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isqrt (int n) |
162 |
{ |
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return (int)sqrtf ((float)n); |
164 |
} |
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|
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// this is only twice as fast as naive sqrtf (dx*dy+dy*dy) |
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#if 0 |
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// and has a max. error of 6 in the range -100..+100. |
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#else |
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// and has a max. error of 9 in the range -100..+100. |
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#endif |
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inline int |
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idistance (int dx, int dy) |
174 |
{ |
175 |
unsigned int dx_ = abs (dx); |
176 |
unsigned int dy_ = abs (dy); |
177 |
|
178 |
#if 0 |
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return dx_ > dy_ |
180 |
? (dx_ * 61685 + dy_ * 26870) >> 16 |
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: (dy_ * 61685 + dx_ * 26870) >> 16; |
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#else |
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return dx_ + dy_ - min (dx_, dy_) * 5 / 8; |
184 |
#endif |
185 |
} |
186 |
|
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/* |
188 |
* absdir(int): Returns a number between 1 and 8, which represent |
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* the "absolute" direction of a number (it actually takes care of |
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* "overflow" in previous calculations of a direction). |
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*/ |
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inline int |
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absdir (int d) |
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{ |
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return ((d - 1) & 7) + 1; |
196 |
} |
197 |
|
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extern ssize_t slice_alloc; // statistics |
199 |
|
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void *salloc_ (int n) throw (std::bad_alloc); |
201 |
void *salloc_ (int n, void *src) throw (std::bad_alloc); |
202 |
|
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// strictly the same as g_slice_alloc, but never returns 0 |
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template<typename T> |
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inline T *salloc (int n = 1) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T)); } |
206 |
|
207 |
// also copies src into the new area, like "memdup" |
208 |
// if src is 0, clears the memory |
209 |
template<typename T> |
210 |
inline T *salloc (int n, T *src) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T), (void *)src); } |
211 |
|
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// clears the memory |
213 |
template<typename T> |
214 |
inline T *salloc0(int n = 1) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T), 0); } |
215 |
|
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// for symmetry |
217 |
template<typename T> |
218 |
inline void sfree (T *ptr, int n = 1) throw () |
219 |
{ |
220 |
if (expect_true (ptr)) |
221 |
{ |
222 |
slice_alloc -= n * sizeof (T); |
223 |
if (DEBUG_POISON) memset (ptr, DEBUG_POISON, n * sizeof (T)); |
224 |
g_slice_free1 (n * sizeof (T), (void *)ptr); |
225 |
assert (slice_alloc >= 0);//D |
226 |
} |
227 |
} |
228 |
|
229 |
// makes dynamically allocated objects zero-initialised |
230 |
struct zero_initialised |
231 |
{ |
232 |
void *operator new (size_t s, void *p) |
233 |
{ |
234 |
memset (p, 0, s); |
235 |
return p; |
236 |
} |
237 |
|
238 |
void *operator new (size_t s) |
239 |
{ |
240 |
return salloc0<char> (s); |
241 |
} |
242 |
|
243 |
void *operator new[] (size_t s) |
244 |
{ |
245 |
return salloc0<char> (s); |
246 |
} |
247 |
|
248 |
void operator delete (void *p, size_t s) |
249 |
{ |
250 |
sfree ((char *)p, s); |
251 |
} |
252 |
|
253 |
void operator delete[] (void *p, size_t s) |
254 |
{ |
255 |
sfree ((char *)p, s); |
256 |
} |
257 |
}; |
258 |
|
259 |
// a STL-compatible allocator that uses g_slice |
260 |
// boy, this is verbose |
261 |
template<typename Tp> |
262 |
struct slice_allocator |
263 |
{ |
264 |
typedef size_t size_type; |
265 |
typedef ptrdiff_t difference_type; |
266 |
typedef Tp *pointer; |
267 |
typedef const Tp *const_pointer; |
268 |
typedef Tp &reference; |
269 |
typedef const Tp &const_reference; |
270 |
typedef Tp value_type; |
271 |
|
272 |
template <class U> |
273 |
struct rebind |
274 |
{ |
275 |
typedef slice_allocator<U> other; |
276 |
}; |
277 |
|
278 |
slice_allocator () throw () { } |
279 |
slice_allocator (const slice_allocator &) throw () { } |
280 |
template<typename Tp2> |
281 |
slice_allocator (const slice_allocator<Tp2> &) throw () { } |
282 |
|
283 |
~slice_allocator () { } |
284 |
|
285 |
pointer address (reference x) const { return &x; } |
286 |
const_pointer address (const_reference x) const { return &x; } |
287 |
|
288 |
pointer allocate (size_type n, const_pointer = 0) |
289 |
{ |
290 |
return salloc<Tp> (n); |
291 |
} |
292 |
|
293 |
void deallocate (pointer p, size_type n) |
294 |
{ |
295 |
sfree<Tp> (p, n); |
296 |
} |
297 |
|
298 |
size_type max_size () const throw () |
299 |
{ |
300 |
return size_t (-1) / sizeof (Tp); |
301 |
} |
302 |
|
303 |
void construct (pointer p, const Tp &val) |
304 |
{ |
305 |
::new (p) Tp (val); |
306 |
} |
307 |
|
308 |
void destroy (pointer p) |
309 |
{ |
310 |
p->~Tp (); |
311 |
} |
312 |
}; |
313 |
|
314 |
// P. L'Ecuyer, “Maximally Equidistributed Combined Tausworthe Generators”, Mathematics of Computation, 65, 213 (1996), 203–213. |
315 |
// http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme.ps |
316 |
// http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme2.ps |
317 |
struct tausworthe_random_generator |
318 |
{ |
319 |
// generator |
320 |
uint32_t state [4]; |
321 |
|
322 |
void operator =(const tausworthe_random_generator &src) |
323 |
{ |
324 |
state [0] = src.state [0]; |
325 |
state [1] = src.state [1]; |
326 |
state [2] = src.state [2]; |
327 |
state [3] = src.state [3]; |
328 |
} |
329 |
|
330 |
void seed (uint32_t seed); |
331 |
uint32_t next (); |
332 |
|
333 |
// uniform distribution |
334 |
uint32_t operator ()(uint32_t num) |
335 |
{ |
336 |
return is_constant (num) |
337 |
? (next () * (uint64_t)num) >> 32U |
338 |
: get_range (num); |
339 |
} |
340 |
|
341 |
// return a number within (min .. max) |
342 |
int operator () (int r_min, int r_max) |
343 |
{ |
344 |
return is_constant (r_min) && is_constant (r_max) && r_min <= r_max |
345 |
? r_min + operator ()(r_max - r_min + 1) |
346 |
: get_range (r_min, r_max); |
347 |
} |
348 |
|
349 |
double operator ()() |
350 |
{ |
351 |
return this->next () / (double)0xFFFFFFFFU; |
352 |
} |
353 |
|
354 |
protected: |
355 |
uint32_t get_range (uint32_t r_max); |
356 |
int get_range (int r_min, int r_max); |
357 |
}; |
358 |
|
359 |
typedef tausworthe_random_generator rand_gen; |
360 |
|
361 |
extern rand_gen rndm; |
362 |
|
363 |
INTERFACE_CLASS (attachable) |
364 |
struct refcnt_base |
365 |
{ |
366 |
typedef int refcnt_t; |
367 |
mutable refcnt_t ACC (RW, refcnt); |
368 |
|
369 |
MTH void refcnt_inc () const { ++refcnt; } |
370 |
MTH void refcnt_dec () const { --refcnt; } |
371 |
|
372 |
refcnt_base () : refcnt (0) { } |
373 |
}; |
374 |
|
375 |
// to avoid branches with more advanced compilers |
376 |
extern refcnt_base::refcnt_t refcnt_dummy; |
377 |
|
378 |
template<class T> |
379 |
struct refptr |
380 |
{ |
381 |
// p if not null |
382 |
refcnt_base::refcnt_t *refcnt_ref () { return p ? &p->refcnt : &refcnt_dummy; } |
383 |
|
384 |
void refcnt_dec () |
385 |
{ |
386 |
if (!is_constant (p)) |
387 |
--*refcnt_ref (); |
388 |
else if (p) |
389 |
--p->refcnt; |
390 |
} |
391 |
|
392 |
void refcnt_inc () |
393 |
{ |
394 |
if (!is_constant (p)) |
395 |
++*refcnt_ref (); |
396 |
else if (p) |
397 |
++p->refcnt; |
398 |
} |
399 |
|
400 |
T *p; |
401 |
|
402 |
refptr () : p(0) { } |
403 |
refptr (const refptr<T> &p) : p(p.p) { refcnt_inc (); } |
404 |
refptr (T *p) : p(p) { refcnt_inc (); } |
405 |
~refptr () { refcnt_dec (); } |
406 |
|
407 |
const refptr<T> &operator =(T *o) |
408 |
{ |
409 |
// if decrementing ever destroys we need to reverse the order here |
410 |
refcnt_dec (); |
411 |
p = o; |
412 |
refcnt_inc (); |
413 |
return *this; |
414 |
} |
415 |
|
416 |
const refptr<T> &operator =(const refptr<T> &o) |
417 |
{ |
418 |
*this = o.p; |
419 |
return *this; |
420 |
} |
421 |
|
422 |
T &operator * () const { return *p; } |
423 |
T *operator ->() const { return p; } |
424 |
|
425 |
operator T *() const { return p; } |
426 |
}; |
427 |
|
428 |
typedef refptr<maptile> maptile_ptr; |
429 |
typedef refptr<object> object_ptr; |
430 |
typedef refptr<archetype> arch_ptr; |
431 |
typedef refptr<client> client_ptr; |
432 |
typedef refptr<player> player_ptr; |
433 |
|
434 |
struct str_hash |
435 |
{ |
436 |
std::size_t operator ()(const char *s) const |
437 |
{ |
438 |
unsigned long hash = 0; |
439 |
|
440 |
/* use the one-at-a-time hash function, which supposedly is |
441 |
* better than the djb2-like one used by perl5.005, but |
442 |
* certainly is better then the bug used here before. |
443 |
* see http://burtleburtle.net/bob/hash/doobs.html |
444 |
*/ |
445 |
while (*s) |
446 |
{ |
447 |
hash += *s++; |
448 |
hash += hash << 10; |
449 |
hash ^= hash >> 6; |
450 |
} |
451 |
|
452 |
hash += hash << 3; |
453 |
hash ^= hash >> 11; |
454 |
hash += hash << 15; |
455 |
|
456 |
return hash; |
457 |
} |
458 |
}; |
459 |
|
460 |
struct str_equal |
461 |
{ |
462 |
bool operator ()(const char *a, const char *b) const |
463 |
{ |
464 |
return !strcmp (a, b); |
465 |
} |
466 |
}; |
467 |
|
468 |
// Mostly the same as std::vector, but insert/erase can reorder |
469 |
// the elements, making append(=insert)/remove O(1) instead of O(n). |
470 |
// |
471 |
// NOTE: only some forms of erase are available |
472 |
template<class T> |
473 |
struct unordered_vector : std::vector<T, slice_allocator<T> > |
474 |
{ |
475 |
typedef typename unordered_vector::iterator iterator; |
476 |
|
477 |
void erase (unsigned int pos) |
478 |
{ |
479 |
if (pos < this->size () - 1) |
480 |
(*this)[pos] = (*this)[this->size () - 1]; |
481 |
|
482 |
this->pop_back (); |
483 |
} |
484 |
|
485 |
void erase (iterator i) |
486 |
{ |
487 |
erase ((unsigned int )(i - this->begin ())); |
488 |
} |
489 |
}; |
490 |
|
491 |
// This container blends advantages of linked lists |
492 |
// (efficiency) with vectors (random access) by |
493 |
// by using an unordered vector and storing the vector |
494 |
// index inside the object. |
495 |
// |
496 |
// + memory-efficient on most 64 bit archs |
497 |
// + O(1) insert/remove |
498 |
// + free unique (but varying) id for inserted objects |
499 |
// + cache-friendly iteration |
500 |
// - only works for pointers to structs |
501 |
// |
502 |
// NOTE: only some forms of erase/insert are available |
503 |
typedef int object_vector_index; |
504 |
|
505 |
template<class T, object_vector_index T::*indexmember> |
506 |
struct object_vector : std::vector<T *, slice_allocator<T *> > |
507 |
{ |
508 |
typedef typename object_vector::iterator iterator; |
509 |
|
510 |
bool contains (const T *obj) const |
511 |
{ |
512 |
return obj->*indexmember; |
513 |
} |
514 |
|
515 |
iterator find (const T *obj) |
516 |
{ |
517 |
return obj->*indexmember |
518 |
? this->begin () + obj->*indexmember - 1 |
519 |
: this->end (); |
520 |
} |
521 |
|
522 |
void push_back (T *obj) |
523 |
{ |
524 |
std::vector<T *, slice_allocator<T *> >::push_back (obj); |
525 |
obj->*indexmember = this->size (); |
526 |
} |
527 |
|
528 |
void insert (T *obj) |
529 |
{ |
530 |
push_back (obj); |
531 |
} |
532 |
|
533 |
void insert (T &obj) |
534 |
{ |
535 |
insert (&obj); |
536 |
} |
537 |
|
538 |
void erase (T *obj) |
539 |
{ |
540 |
unsigned int pos = obj->*indexmember; |
541 |
obj->*indexmember = 0; |
542 |
|
543 |
if (pos < this->size ()) |
544 |
{ |
545 |
(*this)[pos - 1] = (*this)[this->size () - 1]; |
546 |
(*this)[pos - 1]->*indexmember = pos; |
547 |
} |
548 |
|
549 |
this->pop_back (); |
550 |
} |
551 |
|
552 |
void erase (T &obj) |
553 |
{ |
554 |
erase (&obj); |
555 |
} |
556 |
}; |
557 |
|
558 |
// basically does what strncpy should do, but appends "..." to strings exceeding length |
559 |
void assign (char *dst, const char *src, int maxlen); |
560 |
|
561 |
// type-safe version of assign |
562 |
template<int N> |
563 |
inline void assign (char (&dst)[N], const char *src) |
564 |
{ |
565 |
assign ((char *)&dst, src, N); |
566 |
} |
567 |
|
568 |
typedef double tstamp; |
569 |
|
570 |
// return current time as timestamp |
571 |
tstamp now (); |
572 |
|
573 |
int similar_direction (int a, int b); |
574 |
|
575 |
// like sprintf, but returns a "static" buffer |
576 |
const char *format (const char *format, ...); |
577 |
|
578 |
///////////////////////////////////////////////////////////////////////////// |
579 |
// threads, very very thin wrappers around pthreads |
580 |
|
581 |
struct thread |
582 |
{ |
583 |
pthread_t id; |
584 |
|
585 |
void start (void *(*start_routine)(void *), void *arg = 0); |
586 |
|
587 |
void cancel () |
588 |
{ |
589 |
pthread_cancel (id); |
590 |
} |
591 |
|
592 |
void *join () |
593 |
{ |
594 |
void *ret; |
595 |
|
596 |
if (pthread_join (id, &ret)) |
597 |
cleanup ("pthread_join failed", 1); |
598 |
|
599 |
return ret; |
600 |
} |
601 |
}; |
602 |
|
603 |
// note that mutexes are not classes |
604 |
typedef pthread_mutex_t smutex; |
605 |
|
606 |
#if __linux && defined (PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP) |
607 |
#define SMUTEX_INITIALISER PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP |
608 |
#else |
609 |
#define SMUTEX_INITIALISER PTHREAD_MUTEX_INITIALIZER |
610 |
#endif |
611 |
|
612 |
#define SMUTEX(name) smutex name = SMUTEX_INITIALISER |
613 |
#define SMUTEX_LOCK(name) pthread_mutex_lock (&(name)) |
614 |
#define SMUTEX_UNLOCK(name) pthread_mutex_unlock (&(name)) |
615 |
|
616 |
typedef pthread_cond_t scond; |
617 |
|
618 |
#define SCOND(name) scond name = PTHREAD_COND_INITIALIZER |
619 |
#define SCOND_SIGNAL(name) pthread_cond_signal (&(name)) |
620 |
#define SCOND_BROADCAST(name) pthread_cond_broadcast (&(name)) |
621 |
#define SCOND_WAIT(name,mutex) pthread_cond_wait (&(name), &(mutex)) |
622 |
|
623 |
#endif |
624 |
|