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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 1.102 by root, Thu Apr 29 12:24:04 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// could use the sizeof (arr) /( sizeof (arr [0]) here, but C++ is
61// much more obfuscated... :)
62
63template<typename T, int N>
64inline int array_length (const T (&arr)[N])
65{
66 return N;
67}
68
60// very ugly macro that basically declares and initialises a variable 69// very ugly macro that basically declares and initialises a variable
61// that is in scope for the next statement only 70// that is in scope for the next statement only
62// works only for stuff that can be assigned 0 and converts to false 71// works only for stuff that can be assigned 0 and converts to false
63// (note: works great for pointers) 72// (note: works great for pointers)
64// most ugly macro I ever wrote 73// most ugly macro I ever wrote
… …
98inline sint8 sign (sint8 v) { return 1 - (sint8 (uint8 (v) >> 7) * 2); } 107inline sint8 sign (sint8 v) { return 1 - (sint8 (uint8 (v) >> 7) * 2); }
99 108
100// sign0 returns -1, 0 or +1 109// sign0 returns -1, 0 or +1
101template<typename T> 110template<typename T>
102static inline T sign0 (T v) { return v ? sign (v) : 0; } 111static inline T sign0 (T v) { return v ? sign (v) : 0; }
112
113template<typename T, typename U>
114static inline T copysign (T a, U b) { return a > 0 ? b : -b; }
103 115
104// div* only work correctly for div > 0 116// div* only work correctly for div > 0
105// div, with correct rounding (< 0.5 downwards, >=0.5 upwards) 117// div, with correct rounding (< 0.5 downwards, >=0.5 upwards)
106template<typename T> static inline T div (T val, T div) 118template<typename T> static inline T div (T val, T div)
107{ 119{
… …
240absdir (int d) 252absdir (int d)
241{ 253{
242 return ((d - 1) & 7) + 1; 254 return ((d - 1) & 7) + 1;
243} 255}
244 256
257// avoid ctz name because netbsd or freebsd spams it's namespace with it
258#if GCC_VERSION(3,4)
259static inline int least_significant_bit (uint32_t x)
260{
261 return __builtin_ctz (x);
262}
263#else
264int least_significant_bit (uint32_t x);
265#endif
266
267#define for_all_bits_sparse_32(mask, idxvar) \
268 for (uint32_t idxvar, mask_ = mask; \
269 mask_ && ((idxvar = least_significant_bit (mask_)), mask_ &= ~(1 << idxvar), 1);)
270
245extern ssize_t slice_alloc; // statistics 271extern ssize_t slice_alloc; // statistics
246 272
247void *salloc_ (int n) throw (std::bad_alloc); 273void *salloc_ (int n) throw (std::bad_alloc);
248void *salloc_ (int n, void *src) throw (std::bad_alloc); 274void *salloc_ (int n, void *src) throw (std::bad_alloc);
249 275
… …
453 return !is_constant (num) ? get_range (num) // non-constant 479 return !is_constant (num) ? get_range (num) // non-constant
454 : num & (num - 1) ? (this->next () * (uint64_t)num) >> 32U // constant, non-power-of-two 480 : num & (num - 1) ? (this->next () * (uint64_t)num) >> 32U // constant, non-power-of-two
455 : this->next () & (num - 1); // constant, power-of-two 481 : this->next () & (num - 1); // constant, power-of-two
456 } 482 }
457 483
458 // return a number within (min .. max) 484 // return a number within the closed interval [min .. max]
459 int operator () (int r_min, int r_max) 485 int operator () (int r_min, int r_max)
460 { 486 {
461 return is_constant (r_min) && is_constant (r_max) && r_min <= r_max 487 return is_constant (r_min) && is_constant (r_max) && r_min <= r_max
462 ? r_min + operator ()(r_max - r_min + 1) 488 ? r_min + operator ()(r_max - r_min + 1)
463 : get_range (r_min, r_max); 489 : get_range (r_min, r_max);
464 } 490 }
465 491
492 // return a number within the closed interval [0..1]
466 double operator ()() 493 double operator ()()
467 { 494 {
468 return this->next () / (double)0xFFFFFFFFU; 495 return this->next () / (double)0xFFFFFFFFU;
469 } 496 }
470 497
… …
545typedef refptr<maptile> maptile_ptr; 572typedef refptr<maptile> maptile_ptr;
546typedef refptr<object> object_ptr; 573typedef refptr<object> object_ptr;
547typedef refptr<archetype> arch_ptr; 574typedef refptr<archetype> arch_ptr;
548typedef refptr<client> client_ptr; 575typedef refptr<client> client_ptr;
549typedef refptr<player> player_ptr; 576typedef refptr<player> player_ptr;
577typedef refptr<region> region_ptr;
550 578
551#define STRHSH_NULL 2166136261 579#define STRHSH_NULL 2166136261
552 580
553static inline uint32_t 581static inline uint32_t
554strhsh (const char *s) 582strhsh (const char *s)
… …
559 // FNV-1a is faster on many cpus because the multiplication 587 // FNV-1a is faster on many cpus because the multiplication
560 // runs concurrently with the looping logic. 588 // runs concurrently with the looping logic.
561 uint32_t hash = STRHSH_NULL; 589 uint32_t hash = STRHSH_NULL;
562 590
563 while (*s) 591 while (*s)
564 hash = (hash ^ *s++) * 16777619; 592 hash = (hash ^ *s++) * 16777619U;
565 593
566 return hash; 594 return hash;
567} 595}
568 596
569static inline uint32_t 597static inline uint32_t
570memhsh (const char *s, size_t len) 598memhsh (const char *s, size_t len)
571{ 599{
572 uint32_t hash = STRHSH_NULL; 600 uint32_t hash = STRHSH_NULL;
573 601
574 while (len--) 602 while (len--)
575 hash = (hash ^ *s++) * 16777619; 603 hash = (hash ^ *s++) * 16777619U;
576 604
577 return hash; 605 return hash;
578} 606}
579 607
580struct str_hash 608struct str_hash

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