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Comparing deliantra/server/include/util.h (file contents):
Revision 1.25 by root, Sat Dec 30 10:16:10 2006 UTC vs.
Revision 1.34 by root, Fri Jan 19 15:15:50 2007 UTC

… …
6#else 6#else
7# define is_constant(c) 0 7# define is_constant(c) 0
8#endif 8#endif
9 9
10#include <cstddef> 10#include <cstddef>
11#include <cmath>
11#include <new> 12#include <new>
12#include <vector> 13#include <vector>
13 14
14#include <glib.h> 15#include <glib.h>
15 16
16#include <shstr.h> 17#include <shstr.h>
17#include <traits.h> 18#include <traits.h>
18 19
19// use a gcc extension for auto declarations until ISO C++ sanctifies them 20// use a gcc extension for auto declarations until ISO C++ sanctifies them
20#define AUTODECL(var,expr) typeof(expr) var = (expr) 21#define AUTODECL(var,expr) typeof(expr) var = (expr)
22
23// very ugly macro that basicaly declares and initialises a variable
24// that is in scope for the next statement only
25// works only for stuff that can be assigned 0 and converts to false
26// (note: works great for pointers)
27// most ugly macro I ever wrote
28#define declvar(type, name, value) if (type name = 0) { } else if (((name) = (value)), 1)
29
30// in range including end
31#define IN_RANGE_INC(val,beg,end) \
32 ((unsigned int)(val) - (unsigned int)(beg) <= (unsigned int)(end) - (unsigned int)(beg))
33
34// in range excluding end
35#define IN_RANGE_EXC(val,beg,end) \
36 ((unsigned int)(val) - (unsigned int)(beg) < (unsigned int)(end) - (unsigned int)(beg))
37
38void fork_abort (const char *msg);
39
40template<typename T, typename U> static inline T min (T a, U b) { return a < (T)b ? a : (T)b; }
41template<typename T, typename U> static inline T max (T a, U b) { return a > (T)b ? a : (T)b; }
42template<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; }
43
44template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; }
45
46// this is much faster than crossfires original algorithm
47// on modern cpus
48inline int
49isqrt (int n)
50{
51 return (int)sqrtf ((float)n);
52}
53
54// this is only twice as fast as naive sqrtf (dx*dy+dy*dy)
55#if 0
56// and has a max. error of 6 in the range -100..+100.
57#else
58// and has a max. error of 9 in the range -100..+100.
59#endif
60inline int
61idistance (int dx, int dy)
62{
63 unsigned int dx_ = abs (dx);
64 unsigned int dy_ = abs (dy);
65
66#if 0
67 return dx_ > dy_
68 ? (dx_ * 61685 + dy_ * 26870) >> 16
69 : (dy_ * 61685 + dx_ * 26870) >> 16;
70#else
71 return dx_ + dy_ - min (dx_, dy_) * 5 / 8;
72#endif
73}
74
75/*
76 * absdir(int): Returns a number between 1 and 8, which represent
77 * the "absolute" direction of a number (it actually takes care of
78 * "overflow" in previous calculations of a direction).
79 */
80inline int
81absdir (int d)
82{
83 return ((d - 1) & 7) + 1;
84}
21 85
22// makes dynamically allocated objects zero-initialised 86// makes dynamically allocated objects zero-initialised
23struct zero_initialised 87struct zero_initialised
24{ 88{
25 void *operator new (size_t s, void *p) 89 void *operator new (size_t s, void *p)
… …
124 void destroy (pointer p) 188 void destroy (pointer p)
125 { 189 {
126 p->~Tp (); 190 p->~Tp ();
127 } 191 }
128}; 192};
193
194// 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
196// http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme2.ps
197struct tausworthe_random_generator
198{
199 // generator
200 uint32_t state [4];
201
202 void operator =(const tausworthe_random_generator &src)
203 {
204 state [0] = src.state [0];
205 state [1] = src.state [1];
206 state [2] = src.state [2];
207 state [3] = src.state [3];
208 }
209
210 void seed (uint32_t seed);
211 uint32_t next ();
212
213 // uniform distribution
214 uint32_t operator ()(uint32_t r_max)
215 {
216 return is_constant (r_max)
217 ? this->next () % r_max
218 : get_range (r_max);
219 }
220
221 // return a number within (min .. max)
222 int operator () (int r_min, int r_max)
223 {
224 return is_constant (r_min) && is_constant (r_max)
225 ? r_min + (*this) (max (r_max - r_min + 1, 1))
226 : get_range (r_min, r_max);
227 }
228
229 double operator ()()
230 {
231 return this->next () / (double)0xFFFFFFFFU;
232 }
233
234protected:
235 uint32_t get_range (uint32_t r_max);
236 int get_range (int r_min, int r_max);
237};
238
239typedef tausworthe_random_generator rand_gen;
240
241extern rand_gen rndm;
129 242
130template<class T> 243template<class T>
131struct refptr 244struct refptr
132{ 245{
133 T *p; 246 T *p;
… …
196 { 309 {
197 return !strcmp (a, b); 310 return !strcmp (a, b);
198 } 311 }
199}; 312};
200 313
201template<class obj> 314template<class T>
202struct unordered_vector : std::vector<obj, slice_allocator<obj> > 315struct unordered_vector : std::vector<T, slice_allocator<T> >
203{ 316{
204 typedef typename unordered_vector::iterator iterator; 317 typedef typename unordered_vector::iterator iterator;
205 318
206 void erase (unsigned int pos) 319 void erase (unsigned int pos)
207 { 320 {
… …
215 { 328 {
216 erase ((unsigned int )(i - this->begin ())); 329 erase ((unsigned int )(i - this->begin ()));
217 } 330 }
218}; 331};
219 332
220template<typename T, typename U> static inline T min (T a, U b) { return a < (T)b ? a : (T)b; } 333template<class T, int T::* index>
221template<typename T, typename U> static inline T max (T a, U b) { return a > (T)b ? a : (T)b; } 334struct object_vector : std::vector<T *, slice_allocator<T *> >
222template<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; } 335{
336 void insert (T *obj)
337 {
338 assert (!(obj->*index));
339 push_back (obj);
340 obj->*index = this->size ();
341 }
223 342
224template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; } 343 void insert (T &obj)
344 {
345 insert (&obj);
346 }
347
348 void erase (T *obj)
349 {
350 assert (obj->*index);
351 int pos = obj->*index;
352 obj->*index = 0;
353
354 if (pos < this->size ())
355 {
356 (*this)[pos - 1] = (*this)[this->size () - 1];
357 (*this)[pos - 1]->*index = pos;
358 }
359
360 this->pop_back ();
361 }
362
363 void erase (T &obj)
364 {
365 errase (&obj);
366 }
367};
225 368
226// basically does what strncpy should do, but appends "..." to strings exceeding length 369// basically does what strncpy should do, but appends "..." to strings exceeding length
227void assign (char *dst, const char *src, int maxlen); 370void assign (char *dst, const char *src, int maxlen);
228 371
229// type-safe version of assign 372// type-safe version of assign

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