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Comparing deliantra/server/include/util.h (file contents):
Revision 1.37 by root, Thu Feb 15 15:43:36 2007 UTC vs.
Revision 1.45 by root, Sat May 26 15:44:05 2007 UTC

… …
2#define UTIL_H__ 2#define UTIL_H__
3 3
4//#define PREFER_MALLOC 4//#define PREFER_MALLOC
5 5
6#if __GNUC__ >= 3 6#if __GNUC__ >= 3
7# define is_constant(c) __builtin_constant_p (c) 7# define is_constant(c) __builtin_constant_p (c)
8# define expect(expr,value) __builtin_expect ((expr),(value))
9# define prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
8#else 10#else
9# define is_constant(c) 0 11# define is_constant(c) 0
12# define expect(expr,value) (expr)
13# define prefetch(addr,rw,locality)
10#endif 14#endif
15
16// put into ifs if you are very sure that the expression
17// is mostly true or mosty false. note that these return
18// booleans, not the expression.
19#define expect_false(expr) expect ((expr) != 0, 0)
20#define expect_true(expr) expect ((expr) != 0, 1)
11 21
12#include <cstddef> 22#include <cstddef>
13#include <cmath> 23#include <cmath>
14#include <new> 24#include <new>
15#include <vector> 25#include <vector>
… …
18 28
19#include <shstr.h> 29#include <shstr.h>
20#include <traits.h> 30#include <traits.h>
21 31
22// use a gcc extension for auto declarations until ISO C++ sanctifies them 32// use a gcc extension for auto declarations until ISO C++ sanctifies them
23#define AUTODECL(var,expr) typeof(expr) var = (expr) 33#define auto(var,expr) typeof(expr) var = (expr)
24 34
25// very ugly macro that basicaly declares and initialises a variable 35// very ugly macro that basicaly declares and initialises a variable
26// that is in scope for the next statement only 36// that is in scope for the next statement only
27// works only for stuff that can be assigned 0 and converts to false 37// works only for stuff that can be assigned 0 and converts to false
28// (note: works great for pointers) 38// (note: works great for pointers)
… …
45template<typename T, typename U> static inline T max (T a, U b) { return (U)a > b ? (U)a : b; } 55template<typename T, typename U> static inline T max (T a, U b) { return (U)a > b ? (U)a : b; }
46template<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; } 56template<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 57
48template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; } 58template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; }
49 59
60template<typename T>
61static inline T
62lerp (T val, T min_in, T max_in, T min_out, T max_out)
63{
64 return (val - min_in) * (max_out - min_out) / (max_in - min_in) + min_out;
65}
66
50// lots of stuff taken from FXT 67// lots of stuff taken from FXT
51 68
52/* Rotate right. This is used in various places for checksumming */ 69/* Rotate right. This is used in various places for checksumming */
53//TODO: this sucks, use a better checksum algo 70//TODO: that sucks, use a better checksum algo
54static inline uint32_t 71static inline uint32_t
55rotate_right (uint32_t c) 72rotate_right (uint32_t c, uint32_t count = 1)
56{ 73{
57 return (c << 31) | (c >> 1); 74 return (c << (32 - count)) | (c >> count);
75}
76
77static inline uint32_t
78rotate_left (uint32_t c, uint32_t count = 1)
79{
80 return (c >> (32 - count)) | (c << count);
58} 81}
59 82
60// Return abs(a-b) 83// Return abs(a-b)
61// Both a and b must not have the most significant bit set 84// Both a and b must not have the most significant bit set
62static inline uint32_t 85static inline uint32_t
… …
256 279
257 void seed (uint32_t seed); 280 void seed (uint32_t seed);
258 uint32_t next (); 281 uint32_t next ();
259 282
260 // uniform distribution 283 // uniform distribution
261 uint32_t operator ()(uint32_t r_max) 284 uint32_t operator ()(uint32_t num)
262 { 285 {
263 return is_constant (r_max) 286 return is_constant (num)
264 ? this->next () % r_max 287 ? (next () * (uint64_t)num) >> 32U
265 : get_range (r_max); 288 : get_range (num);
266 } 289 }
267 290
268 // return a number within (min .. max) 291 // return a number within (min .. max)
269 int operator () (int r_min, int r_max) 292 int operator () (int r_min, int r_max)
270 { 293 {
271 return is_constant (r_min) && is_constant (r_max) 294 return is_constant (r_min) && is_constant (r_max) && r_min <= r_max
272 ? r_min + (*this) (max (r_max - r_min + 1, 1)) 295 ? r_min + operator ()(r_max - r_min + 1)
273 : get_range (r_min, r_max); 296 : get_range (r_min, r_max);
274 } 297 }
275 298
276 double operator ()() 299 double operator ()()
277 { 300 {
… …
393 } 416 }
394 417
395 void erase (T *obj) 418 void erase (T *obj)
396 { 419 {
397 assert (obj->*index); 420 assert (obj->*index);
398 int pos = obj->*index; 421 unsigned int pos = obj->*index;
399 obj->*index = 0; 422 obj->*index = 0;
400 423
401 if (pos < this->size ()) 424 if (pos < this->size ())
402 { 425 {
403 (*this)[pos - 1] = (*this)[this->size () - 1]; 426 (*this)[pos - 1] = (*this)[this->size () - 1];
… …
428// return current time as timestampe 451// return current time as timestampe
429tstamp now (); 452tstamp now ();
430 453
431int similar_direction (int a, int b); 454int similar_direction (int a, int b);
432 455
456// like printf, but returns a std::string
457const std::string format (const char *format, ...);
458
433#endif 459#endif
434 460

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