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Comparing deliantra/server/include/util.h (file contents):
Revision 1.95 by root, Tue Nov 10 00:01:31 2009 UTC vs.
Revision 1.107 by root, Sun May 2 14:46:56 2010 UTC

1/* 1/*
2 * This file is part of Deliantra, the Roguelike Realtime MMORPG. 2 * This file is part of Deliantra, the Roguelike Realtime MMORPG.
3 * 3 *
4 * Copyright (©) 2005,2006,2007,2008 Marc Alexander Lehmann / Robin Redeker / the Deliantra team 4 * Copyright (©) 2005,2006,2007,2008,2009,2010 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
5 * 5 *
6 * Deliantra is free software: you can redistribute it and/or modify it under 6 * Deliantra is free software: you can redistribute it and/or modify it under
7 * the terms of the Affero GNU General Public License as published by the 7 * the terms of the Affero GNU General Public License as published by the
8 * Free Software Foundation, either version 3 of the License, or (at your 8 * Free Software Foundation, either version 3 of the License, or (at your
9 * option) any later version. 9 * option) any later version.
… …
55#endif 55#endif
56 56
57// use C0X decltype for auto declarations until ISO C++ sanctifies them (if ever) 57// use C0X decltype for auto declarations until ISO C++ sanctifies them (if ever)
58#define auto(var,expr) decltype(expr) var = (expr) 58#define auto(var,expr) decltype(expr) var = (expr)
59 59
60#if cplusplus_does_not_suck
61// does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm)
62template<typename T, int N>
63static inline int array_length (const T (&arr)[N])
64{
65 return N;
66}
67#else
68#define array_length(name) (sizeof (name) / sizeof (name [0]))
69#endif
70
60// very ugly macro that basically declares and initialises a variable 71// very ugly macro that basically declares and initialises a variable
61// that is in scope for the next statement only 72// that is in scope for the next statement only
62// works only for stuff that can be assigned 0 and converts to false 73// works only for stuff that can be assigned 0 and converts to false
63// (note: works great for pointers) 74// (note: works great for pointers)
64// most ugly macro I ever wrote 75// most ugly macro I ever wrote
… …
93// sign returns -1 or +1 104// sign returns -1 or +1
94template<typename T> 105template<typename T>
95static inline T sign (T v) { return v < 0 ? -1 : +1; } 106static inline T sign (T v) { return v < 0 ? -1 : +1; }
96// relies on 2c representation 107// relies on 2c representation
97template<> 108template<>
98inline sint8 sign (sint8 v) { return 1 - (sint8 (uint8 (v) >> 7) * 2); } 109inline sint8 sign (sint8 v) { return 1 - (sint8 (uint8 (v) >> 7) * 2); }
110template<>
111inline sint16 sign (sint16 v) { return 1 - (sint16 (uint16 (v) >> 15) * 2); }
112template<>
113inline sint32 sign (sint32 v) { return 1 - (sint32 (uint32 (v) >> 31) * 2); }
99 114
100// sign0 returns -1, 0 or +1 115// sign0 returns -1, 0 or +1
101template<typename T> 116template<typename T>
102static inline T sign0 (T v) { return v ? sign (v) : 0; } 117static inline T sign0 (T v) { return v ? sign (v) : 0; }
118
119template<typename T, typename U>
120static inline T copysign (T a, U b) { return a > 0 ? b : -b; }
103 121
104// div* only work correctly for div > 0 122// div* only work correctly for div > 0
105// div, with correct rounding (< 0.5 downwards, >=0.5 upwards) 123// div, with correct rounding (< 0.5 downwards, >=0.5 upwards)
106template<typename T> static inline T div (T val, T div) 124template<typename T> static inline T div (T val, T div)
107{ 125{
108 return expect_false (val < 0) ? - ((-val + (div - 1) / 2) / div) : (val + div / 2) / div; 126 return expect_false (val < 0) ? - ((-val + (div - 1) / 2) / div) : (val + div / 2) / div;
109} 127}
128
129template<> inline float div (float val, float div) { return val / div; }
130template<> inline double div (double val, double div) { return val / div; }
131
110// div, round-up 132// div, round-up
111template<typename T> static inline T div_ru (T val, T div) 133template<typename T> static inline T div_ru (T val, T div)
112{ 134{
113 return expect_false (val < 0) ? - ((-val ) / div) : (val + div - 1) / div; 135 return expect_false (val < 0) ? - ((-val ) / div) : (val + div - 1) / div;
114} 136}
… …
240absdir (int d) 262absdir (int d)
241{ 263{
242 return ((d - 1) & 7) + 1; 264 return ((d - 1) & 7) + 1;
243} 265}
244 266
267// avoid ctz name because netbsd or freebsd spams it's namespace with it
268#if GCC_VERSION(3,4)
269static inline int least_significant_bit (uint32_t x)
270{
271 return __builtin_ctz (x);
272}
273#else
274int least_significant_bit (uint32_t x);
275#endif
276
277#define for_all_bits_sparse_32(mask, idxvar) \
278 for (uint32_t idxvar, mask_ = mask; \
279 mask_ && ((idxvar = least_significant_bit (mask_)), mask_ &= ~(1 << idxvar), 1);)
280
245extern ssize_t slice_alloc; // statistics 281extern ssize_t slice_alloc; // statistics
246 282
247void *salloc_ (int n) throw (std::bad_alloc); 283void *salloc_ (int n) throw (std::bad_alloc);
248void *salloc_ (int n, void *src) throw (std::bad_alloc); 284void *salloc_ (int n, void *src) throw (std::bad_alloc);
249 285
… …
445}; 481};
446 482
447template<class generator> 483template<class generator>
448struct random_number_generator : generator 484struct random_number_generator : generator
449{ 485{
450 // uniform distribution, 0 .. max (0, num - 1) 486 // uniform distribution, [0 .. num - 1]
451 uint32_t operator ()(uint32_t num) 487 uint32_t operator ()(uint32_t num)
452 { 488 {
453 return !is_constant (num) ? get_range (num) // non-constant 489 return !is_constant (num) ? get_range (num) // non-constant
454 : num & (num - 1) ? (this->next () * (uint64_t)num) >> 32U // constant, non-power-of-two 490 : num & (num - 1) ? (this->next () * (uint64_t)num) >> 32U // constant, non-power-of-two
455 : this->next () & (num - 1); // constant, power-of-two 491 : this->next () & (num - 1); // constant, power-of-two
456 } 492 }
457 493
458 // return a number within (min .. max) 494 // return a number within the closed interval [min .. max]
459 int operator () (int r_min, int r_max) 495 int operator () (int r_min, int r_max)
460 { 496 {
461 return is_constant (r_min) && is_constant (r_max) && r_min <= r_max 497 return is_constant (r_min <= r_max) && r_min <= r_max
462 ? r_min + operator ()(r_max - r_min + 1) 498 ? r_min + operator ()(r_max - r_min + 1)
463 : get_range (r_min, r_max); 499 : get_range (r_min, r_max);
464 } 500 }
465 501
502 // return a number within the half-open interval [0..1[
466 double operator ()() 503 double operator ()()
467 { 504 {
468 return this->next () / (double)0xFFFFFFFFU; 505 return this->next () / (double)0x100000000;
469 } 506 }
470 507
471protected: 508protected:
472 uint32_t get_range (uint32_t r_max); 509 uint32_t get_range (uint32_t r_max);
473 int get_range (int r_min, int r_max); 510 int get_range (int r_min, int r_max);
… …
545typedef refptr<maptile> maptile_ptr; 582typedef refptr<maptile> maptile_ptr;
546typedef refptr<object> object_ptr; 583typedef refptr<object> object_ptr;
547typedef refptr<archetype> arch_ptr; 584typedef refptr<archetype> arch_ptr;
548typedef refptr<client> client_ptr; 585typedef refptr<client> client_ptr;
549typedef refptr<player> player_ptr; 586typedef refptr<player> player_ptr;
587typedef refptr<region> region_ptr;
550 588
551#define STRHSH_NULL 2166136261 589#define STRHSH_NULL 2166136261
552 590
553static inline uint32_t 591static inline uint32_t
554strhsh (const char *s) 592strhsh (const char *s)
… …
559 // FNV-1a is faster on many cpus because the multiplication 597 // FNV-1a is faster on many cpus because the multiplication
560 // runs concurrently with the looping logic. 598 // runs concurrently with the looping logic.
561 uint32_t hash = STRHSH_NULL; 599 uint32_t hash = STRHSH_NULL;
562 600
563 while (*s) 601 while (*s)
564 hash = (hash ^ *s++) * 16777619; 602 hash = (hash ^ *s++) * 16777619U;
565 603
566 return hash; 604 return hash;
567} 605}
568 606
569static inline uint32_t 607static inline uint32_t
570memhsh (const char *s, size_t len) 608memhsh (const char *s, size_t len)
571{ 609{
572 uint32_t hash = STRHSH_NULL; 610 uint32_t hash = STRHSH_NULL;
573 611
574 while (len--) 612 while (len--)
575 hash = (hash ^ *s++) * 16777619; 613 hash = (hash ^ *s++) * 16777619U;
576 614
577 return hash; 615 return hash;
578} 616}
579 617
580struct str_hash 618struct str_hash

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