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Comparing deliantra/server/include/util.h (file contents):
Revision 1.89 by sf-marcmagus, Sun Oct 11 01:35:52 2009 UTC vs.
Revision 1.126 by root, Sat Nov 17 23:33:18 2018 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 (©) 2005,2006,2007,2008,2009,2010,2011,2012,2013,2014,2015,2016 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
5 * 5 *
6 * Deliantra is free software: you can redistribute it and/or modify 6 * Deliantra is free software: you can redistribute it and/or modify it under
7 * it under the terms of the GNU General Public License as published by 7 * the terms of the Affero GNU General Public License as published by the
8 * the Free Software Foundation, either version 3 of the License, or 8 * Free Software Foundation, either version 3 of the License, or (at your
9 * (at your option) any later version. 9 * option) any later version.
10 * 10 *
11 * This program is distributed in the hope that it will be useful, 11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details. 14 * GNU General Public License for more details.
15 * 15 *
16 * You should have received a copy of the GNU General Public License 16 * You should have received a copy of the Affero GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>. 17 * and the GNU General Public License along with this program. If not, see
18 * <http://www.gnu.org/licenses/>.
18 * 19 *
19 * The authors can be reached via e-mail to <support@deliantra.net> 20 * The authors can be reached via e-mail to <support@deliantra.net>
20 */ 21 */
21 22
22#ifndef UTIL_H__ 23#ifndef UTIL_H__
23#define UTIL_H__ 24#define UTIL_H__
25
26#include <compiler.h>
24 27
25#define DEBUG_POISON 0x00 // poison memory before freeing it if != 0 28#define DEBUG_POISON 0x00 // poison memory before freeing it if != 0
26#define DEBUG_SALLOC 0 // add a debug wrapper around all sallocs 29#define DEBUG_SALLOC 0 // add a debug wrapper around all sallocs
27#define PREFER_MALLOC 0 // use malloc and not the slice allocator 30#define PREFER_MALLOC 0 // use malloc and not the slice allocator
28
29#if __GNUC__ >= 3
30# define is_constant(c) __builtin_constant_p (c)
31# define expect(expr,value) __builtin_expect ((expr),(value))
32# define prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
33# define noinline __attribute__((__noinline__))
34#else
35# define is_constant(c) 0
36# define expect(expr,value) (expr)
37# define prefetch(addr,rw,locality)
38# define noinline
39#endif
40
41#if __GNUC__ < 4 || (__GNUC__ == 4 || __GNUC_MINOR__ < 4)
42# define decltype(x) typeof(x)
43#endif
44
45// put into ifs if you are very sure that the expression
46// is mostly true or mosty false. note that these return
47// booleans, not the expression.
48#define expect_false(expr) expect ((expr) ? 1 : 0, 0)
49#define expect_true(expr) expect ((expr) ? 1 : 0, 1)
50 31
51#include <pthread.h> 32#include <pthread.h>
52 33
53#include <cstddef> 34#include <cstddef>
54#include <cmath> 35#include <cmath>
… …
74#endif 55#endif
75 56
76// 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)
77#define auto(var,expr) decltype(expr) var = (expr) 58#define auto(var,expr) decltype(expr) var = (expr)
78 59
60#if cplusplus_does_not_suck /* still sucks in codesize with gcc 6, although local types work now */
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
79// very ugly macro that basically declares and initialises a variable 71// very ugly macro that basically declares and initialises a variable
80// that is in scope for the next statement only 72// that is in scope for the next statement only
81// 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
82// (note: works great for pointers) 74// (note: works great for pointers)
83// most ugly macro I ever wrote 75// most ugly macro I ever wrote
… …
89 81
90// in range excluding end 82// in range excluding end
91#define IN_RANGE_EXC(val,beg,end) \ 83#define IN_RANGE_EXC(val,beg,end) \
92 ((unsigned int)(val) - (unsigned int)(beg) < (unsigned int)(end) - (unsigned int)(beg)) 84 ((unsigned int)(val) - (unsigned int)(beg) < (unsigned int)(end) - (unsigned int)(beg))
93 85
94void cleanup (const char *cause, bool make_core = false); 86ecb_cold void cleanup (const char *cause, bool make_core = false);
95void fork_abort (const char *msg); 87ecb_cold void fork_abort (const char *msg);
96 88
97// rationale for using (U) not (T) is to reduce signed/unsigned issues, 89// rationale for using (U) not (T) is to reduce signed/unsigned issues,
98// as a is often a constant while b is the variable. it is still a bug, though. 90// as a is often a constant while b is the variable. it is still a bug, though.
99template<typename T, typename U> static inline T min (T a, U b) { return (U)a < b ? (U)a : b; } 91template<typename T, typename U> static inline T min (T a, U b) { return a < (T)b ? a : (T)b; }
100template<typename T, typename U> static inline T max (T a, U b) { return (U)a > b ? (U)a : b; } 92template<typename T, typename U> static inline T max (T a, U b) { return a > (T)b ? a : (T)b; }
101template<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; } 93template<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; }
102 94
103template<typename T, typename U> static inline void min_it (T &v, U m) { v = min (v, (T)m); } 95template<typename T, typename U> static inline void min_it (T &v, U m) { v = min (v, (T)m); }
104template<typename T, typename U> static inline void max_it (T &v, U m) { v = max (v, (T)m); } 96template<typename T, typename U> static inline void max_it (T &v, U m) { v = max (v, (T)m); }
105template<typename T, typename U, typename V> static inline void clamp_it (T &v, U a, V b) { v = clamp (v, (T)a, (T)b); } 97template<typename T, typename U, typename V> static inline void clamp_it (T &v, U a, V b) { v = clamp (v, (T)a, (T)b); }
… …
112// sign returns -1 or +1 104// sign returns -1 or +1
113template<typename T> 105template<typename T>
114static inline T sign (T v) { return v < 0 ? -1 : +1; } 106static inline T sign (T v) { return v < 0 ? -1 : +1; }
115// relies on 2c representation 107// relies on 2c representation
116template<> 108template<>
117inline 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); }
118 114
119// sign0 returns -1, 0 or +1 115// sign0 returns -1, 0 or +1
120template<typename T> 116template<typename T>
121static inline T sign0 (T v) { return v ? sign (v) : 0; } 117static inline T sign0 (T v) { return v ? sign (v) : 0; }
118
119//clashes with C++0x
120template<typename T, typename U>
121static inline T copysign (T a, U b) { return a > 0 ? b : -b; }
122 122
123// div* only work correctly for div > 0 123// div* only work correctly for div > 0
124// div, with correct rounding (< 0.5 downwards, >=0.5 upwards) 124// div, with correct rounding (< 0.5 downwards, >=0.5 upwards)
125template<typename T> static inline T div (T val, T div) 125template<typename T> static inline T div (T val, T div)
126{ 126{
127 return expect_false (val < 0) ? - ((-val + (div - 1) / 2) / div) : (val + div / 2) / div; 127 return expect_false (val < 0) ? - ((-val + (div - 1) / 2) / div) : (val + div / 2) / div;
128} 128}
129
130template<> inline float div (float val, float div) { return val / div; }
131template<> inline double div (double val, double div) { return val / div; }
132
129// div, round-up 133// div, round-up
130template<typename T> static inline T div_ru (T val, T div) 134template<typename T> static inline T div_ru (T val, T div)
131{ 135{
132 return expect_false (val < 0) ? - ((-val ) / div) : (val + div - 1) / div; 136 return expect_false (val < 0) ? - ((-val ) / div) : (val + div - 1) / div;
133} 137}
… …
205 int32_t d = b - a; 209 int32_t d = b - a;
206 d &= d >> 31; 210 d &= d >> 31;
207 return b - d; 211 return b - d;
208} 212}
209 213
210// this is much faster than crossfires original algorithm 214// this is much faster than crossfire's original algorithm
211// on modern cpus 215// on modern cpus
212inline int 216inline int
213isqrt (int n) 217isqrt (int n)
214{ 218{
215 return (int)sqrtf ((float)n); 219 return (int)sqrtf ((float)n);
220}
221
222// this is kind of like the ^^ operator, if it would exist, without sequence point.
223// more handy than it looks like, due to the implicit !! done on its arguments
224inline bool
225logical_xor (bool a, bool b)
226{
227 return a != b;
228}
229
230inline bool
231logical_implies (bool a, bool b)
232{
233 return a <= b;
216} 234}
217 235
218// this is only twice as fast as naive sqrtf (dx*dy+dy*dy) 236// this is only twice as fast as naive sqrtf (dx*dy+dy*dy)
219#if 0 237#if 0
220// and has a max. error of 6 in the range -100..+100. 238// and has a max. error of 6 in the range -100..+100.
221#else 239#else
222// and has a max. error of 9 in the range -100..+100. 240// and has a max. error of 9 in the range -100..+100.
223#endif 241#endif
224inline int 242inline int
225idistance (int dx, int dy) 243idistance (int dx, int dy)
226{ 244{
227 unsigned int dx_ = abs (dx); 245 unsigned int dx_ = abs (dx);
228 unsigned int dy_ = abs (dy); 246 unsigned int dy_ = abs (dy);
229 247
230#if 0 248#if 0
231 return dx_ > dy_ 249 return dx_ > dy_
… …
234#else 252#else
235 return dx_ + dy_ - min (dx_, dy_) * 5 / 8; 253 return dx_ + dy_ - min (dx_, dy_) * 5 / 8;
236#endif 254#endif
237} 255}
238 256
257// can be substantially faster than floor, if your value range allows for it
258template<typename T>
259inline T
260fastfloor (T x)
261{
262 return std::floor (x);
263}
264
265inline float
266fastfloor (float x)
267{
268 return sint32(x) - (x < 0);
269}
270
271inline double
272fastfloor (double x)
273{
274 return sint64(x) - (x < 0);
275}
276
239/* 277/*
240 * absdir(int): Returns a number between 1 and 8, which represent 278 * absdir(int): Returns a number between 1 and 8, which represent
241 * the "absolute" direction of a number (it actually takes care of 279 * the "absolute" direction of a number (it actually takes care of
242 * "overflow" in previous calculations of a direction). 280 * "overflow" in previous calculations of a direction).
243 */ 281 */
… …
245absdir (int d) 283absdir (int d)
246{ 284{
247 return ((d - 1) & 7) + 1; 285 return ((d - 1) & 7) + 1;
248} 286}
249 287
288#define for_all_bits_sparse_32(mask, idxvar) \
289 for (uint32_t idxvar, mask_ = mask; \
290 mask_ && ((idxvar = ecb_ctz32 (mask_)), mask_ &= ~(1 << idxvar), 1);)
291
250extern ssize_t slice_alloc; // statistics 292extern ssize_t slice_alloc; // statistics
251 293
252void *salloc_ (int n) throw (std::bad_alloc); 294void *salloc_ (int n);
253void *salloc_ (int n, void *src) throw (std::bad_alloc); 295void *salloc_ (int n, void *src);
254 296
255// strictly the same as g_slice_alloc, but never returns 0 297// strictly the same as g_slice_alloc, but never returns 0
256template<typename T> 298template<typename T>
257inline T *salloc (int n = 1) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T)); } 299inline T *salloc (int n = 1) { return (T *)salloc_ (n * sizeof (T)); }
258 300
259// also copies src into the new area, like "memdup" 301// also copies src into the new area, like "memdup"
260// if src is 0, clears the memory 302// if src is 0, clears the memory
261template<typename T> 303template<typename T>
262inline T *salloc (int n, T *src) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T), (void *)src); } 304inline T *salloc (int n, T *src) { return (T *)salloc_ (n * sizeof (T), (void *)src); }
263 305
264// clears the memory 306// clears the memory
265template<typename T> 307template<typename T>
266inline T *salloc0(int n = 1) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T), 0); } 308inline T *salloc0(int n = 1) { return (T *)salloc_ (n * sizeof (T), 0); }
267 309
268// for symmetry 310// for symmetry
269template<typename T> 311template<typename T>
270inline void sfree (T *ptr, int n = 1) throw () 312inline void sfree (T *ptr, int n = 1) noexcept
271{ 313{
272 if (expect_true (ptr)) 314 if (expect_true (ptr))
273 { 315 {
274 slice_alloc -= n * sizeof (T); 316 slice_alloc -= n * sizeof (T);
275 if (DEBUG_POISON) memset (ptr, DEBUG_POISON, n * sizeof (T)); 317 if (DEBUG_POISON) memset (ptr, DEBUG_POISON, n * sizeof (T));
276 g_slice_free1 (n * sizeof (T), (void *)ptr); 318 g_slice_free1 (n * sizeof (T), (void *)ptr);
277 assert (slice_alloc >= 0);//D
278 } 319 }
279} 320}
280 321
281// nulls the pointer 322// nulls the pointer
282template<typename T> 323template<typename T>
283inline void sfree0 (T *&ptr, int n = 1) throw () 324inline void sfree0 (T *&ptr, int n = 1) noexcept
284{ 325{
285 sfree<T> (ptr, n); 326 sfree<T> (ptr, n);
286 ptr = 0; 327 ptr = 0;
287} 328}
288 329
… …
356 typedef const Tp *const_pointer; 397 typedef const Tp *const_pointer;
357 typedef Tp &reference; 398 typedef Tp &reference;
358 typedef const Tp &const_reference; 399 typedef const Tp &const_reference;
359 typedef Tp value_type; 400 typedef Tp value_type;
360 401
361 template <class U> 402 template <class U>
362 struct rebind 403 struct rebind
363 { 404 {
364 typedef slice_allocator<U> other; 405 typedef slice_allocator<U> other;
365 }; 406 };
366 407
367 slice_allocator () throw () { } 408 slice_allocator () noexcept { }
368 slice_allocator (const slice_allocator &) throw () { } 409 slice_allocator (const slice_allocator &) noexcept { }
369 template<typename Tp2> 410 template<typename Tp2>
370 slice_allocator (const slice_allocator<Tp2> &) throw () { } 411 slice_allocator (const slice_allocator<Tp2> &) noexcept { }
371 412
372 ~slice_allocator () { } 413 ~slice_allocator () { }
373 414
374 pointer address (reference x) const { return &x; } 415 pointer address (reference x) const { return &x; }
375 const_pointer address (const_reference x) const { return &x; } 416 const_pointer address (const_reference x) const { return &x; }
… …
382 void deallocate (pointer p, size_type n) 423 void deallocate (pointer p, size_type n)
383 { 424 {
384 sfree<Tp> (p, n); 425 sfree<Tp> (p, n);
385 } 426 }
386 427
387 size_type max_size () const throw () 428 size_type max_size () const noexcept
388 { 429 {
389 return size_t (-1) / sizeof (Tp); 430 return size_t (-1) / sizeof (Tp);
390 } 431 }
391 432
392 void construct (pointer p, const Tp &val) 433 void construct (pointer p, const Tp &val)
… …
398 { 439 {
399 p->~Tp (); 440 p->~Tp ();
400 } 441 }
401}; 442};
402 443
403// P. L'Ecuyer, “Maximally Equidistributed Combined Tausworthe Generators”, Mathematics of Computation, 65, 213 (1996), 203–213. 444// basically a memory area, but refcounted
404// http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme.ps 445struct refcnt_buf
405// http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme2.ps
406struct tausworthe_random_generator
407{ 446{
408 uint32_t state [4]; 447 char *data;
409 448
410 void operator =(const tausworthe_random_generator &src) 449 refcnt_buf (size_t size = 0);
411 { 450 refcnt_buf (void *data, size_t size);
412 state [0] = src.state [0];
413 state [1] = src.state [1];
414 state [2] = src.state [2];
415 state [3] = src.state [3];
416 }
417 451
418 void seed (uint32_t seed); 452 refcnt_buf (const refcnt_buf &src)
419 uint32_t next ();
420};
421
422// Xorshift RNGs, George Marsaglia
423// http://www.jstatsoft.org/v08/i14/paper
424// this one is about 40% faster than the tausworthe one above (i.e. not much),
425// despite the inlining, and has the issue of only creating 2**32-1 numbers.
426// see also http://www.iro.umontreal.ca/~lecuyer/myftp/papers/xorshift.pdf
427struct xorshift_random_generator
428{
429 uint32_t x, y;
430
431 void operator =(const xorshift_random_generator &src)
432 { 453 {
433 x = src.x; 454 data = src.data;
434 y = src.y; 455 inc ();
435 } 456 }
436 457
437 void seed (uint32_t seed) 458 ~refcnt_buf ();
438 {
439 x = seed;
440 y = seed * 69069U;
441 }
442 459
443 uint32_t next () 460 refcnt_buf &operator =(const refcnt_buf &src);
461
462 operator char *()
444 { 463 {
445 uint32_t t = x ^ (x << 10);
446 x = y;
447 y = y ^ (y >> 13) ^ t ^ (t >> 10);
448 return y; 464 return data;
449 } 465 }
450};
451 466
452template<class generator> 467 size_t size () const
453struct random_number_generator : generator
454{
455 // uniform distribution, 0 .. max (0, num - 1)
456 uint32_t operator ()(uint32_t num)
457 { 468 {
458 return !is_constant (num) ? get_range (num) // non-constant 469 return _size ();
459 : num & (num - 1) ? (this->next () * (uint64_t)num) >> 32U // constant, non-power-of-two
460 : this->next () & (num - 1); // constant, power-of-two
461 }
462
463 // return a number within (min .. max)
464 int operator () (int r_min, int r_max)
465 {
466 return is_constant (r_min) && is_constant (r_max) && r_min <= r_max
467 ? r_min + operator ()(r_max - r_min + 1)
468 : get_range (r_min, r_max);
469 }
470
471 double operator ()()
472 {
473 return this->next () / (double)0xFFFFFFFFU;
474 } 470 }
475 471
476protected: 472protected:
477 uint32_t get_range (uint32_t r_max); 473 enum {
478 int get_range (int r_min, int r_max); 474 overhead = sizeof (uint32_t) * 2
479}; 475 };
480 476
481typedef random_number_generator<tausworthe_random_generator> rand_gen; 477 uint32_t &_size () const
478 {
479 return ((unsigned int *)data)[-2];
480 }
482 481
483extern rand_gen rndm, rmg_rndm; 482 uint32_t &_refcnt () const
483 {
484 return ((unsigned int *)data)[-1];
485 }
486
487 void _alloc (uint32_t size)
488 {
489 data = ((char *)salloc<char> (size + overhead)) + overhead;
490 _size () = size;
491 _refcnt () = 1;
492 }
493
494 void _dealloc ();
495
496 void inc ()
497 {
498 ++_refcnt ();
499 }
500
501 void dec ()
502 {
503 if (!--_refcnt ())
504 _dealloc ();
505 }
506};
484 507
485INTERFACE_CLASS (attachable) 508INTERFACE_CLASS (attachable)
486struct refcnt_base 509struct refcnt_base
487{ 510{
488 typedef int refcnt_t; 511 typedef int refcnt_t;
… …
503 // p if not null 526 // p if not null
504 refcnt_base::refcnt_t *refcnt_ref () { return p ? &p->refcnt : &refcnt_dummy; } 527 refcnt_base::refcnt_t *refcnt_ref () { return p ? &p->refcnt : &refcnt_dummy; }
505 528
506 void refcnt_dec () 529 void refcnt_dec ()
507 { 530 {
508 if (!is_constant (p)) 531 if (!ecb_is_constant (p))
509 --*refcnt_ref (); 532 --*refcnt_ref ();
510 else if (p) 533 else if (p)
511 --p->refcnt; 534 --p->refcnt;
512 } 535 }
513 536
514 void refcnt_inc () 537 void refcnt_inc ()
515 { 538 {
516 if (!is_constant (p)) 539 if (!ecb_is_constant (p))
517 ++*refcnt_ref (); 540 ++*refcnt_ref ();
518 else if (p) 541 else if (p)
519 ++p->refcnt; 542 ++p->refcnt;
520 } 543 }
521 544
… …
550typedef refptr<maptile> maptile_ptr; 573typedef refptr<maptile> maptile_ptr;
551typedef refptr<object> object_ptr; 574typedef refptr<object> object_ptr;
552typedef refptr<archetype> arch_ptr; 575typedef refptr<archetype> arch_ptr;
553typedef refptr<client> client_ptr; 576typedef refptr<client> client_ptr;
554typedef refptr<player> player_ptr; 577typedef refptr<player> player_ptr;
578typedef refptr<region> region_ptr;
579
580#define STRHSH_NULL 2166136261
581
582static inline uint32_t
583strhsh (const char *s)
584{
585 // use FNV-1a hash (http://isthe.com/chongo/tech/comp/fnv/)
586 // it is about twice as fast as the one-at-a-time one,
587 // with good distribution.
588 // FNV-1a is faster on many cpus because the multiplication
589 // runs concurrently with the looping logic.
590 // we modify the hash a bit to improve its distribution
591 uint32_t hash = STRHSH_NULL;
592
593 while (*s)
594 hash = (hash ^ *s++) * 16777619U;
595
596 return hash ^ (hash >> 16);
597}
598
599static inline uint32_t
600memhsh (const char *s, size_t len)
601{
602 uint32_t hash = STRHSH_NULL;
603
604 while (len--)
605 hash = (hash ^ *s++) * 16777619U;
606
607 return hash;
608}
555 609
556struct str_hash 610struct str_hash
557{ 611{
558 std::size_t operator ()(const char *s) const 612 std::size_t operator ()(const char *s) const
559 { 613 {
560#if 0
561 uint32_t hash = 0;
562
563 /* use the one-at-a-time hash function, which supposedly is
564 * better than the djb2-like one used by perl5.005, but
565 * certainly is better then the bug used here before.
566 * see http://burtleburtle.net/bob/hash/doobs.html
567 */
568 while (*s)
569 {
570 hash += *s++;
571 hash += hash << 10;
572 hash ^= hash >> 6;
573 }
574
575 hash += hash << 3;
576 hash ^= hash >> 11;
577 hash += hash << 15;
578#else
579 // use FNV-1a hash (http://isthe.com/chongo/tech/comp/fnv/)
580 // it is about twice as fast as the one-at-a-time one,
581 // with good distribution.
582 // FNV-1a is faster on many cpus because the multiplication
583 // runs concurrent with the looping logic.
584 uint32_t hash = 2166136261;
585
586 while (*s)
587 hash = (hash ^ *s++) * 16777619;
588#endif
589
590 return hash; 614 return strhsh (s);
615 }
616
617 std::size_t operator ()(const shstr &s) const
618 {
619 return strhsh (s);
591 } 620 }
592}; 621};
593 622
594struct str_equal 623struct str_equal
595{ 624{
… …
622 } 651 }
623}; 652};
624 653
625// This container blends advantages of linked lists 654// This container blends advantages of linked lists
626// (efficiency) with vectors (random access) by 655// (efficiency) with vectors (random access) by
627// by using an unordered vector and storing the vector 656// using an unordered vector and storing the vector
628// index inside the object. 657// index inside the object.
629// 658//
630// + memory-efficient on most 64 bit archs 659// + memory-efficient on most 64 bit archs
631// + O(1) insert/remove 660// + O(1) insert/remove
632// + free unique (but varying) id for inserted objects 661// + free unique (but varying) id for inserted objects
… …
669 insert (&obj); 698 insert (&obj);
670 } 699 }
671 700
672 void erase (T *obj) 701 void erase (T *obj)
673 { 702 {
674 unsigned int pos = obj->*indexmember; 703 object_vector_index pos = obj->*indexmember;
675 obj->*indexmember = 0; 704 obj->*indexmember = 0;
676 705
677 if (pos < this->size ()) 706 if (pos < this->size ())
678 { 707 {
679 (*this)[pos - 1] = (*this)[this->size () - 1]; 708 (*this)[pos - 1] = (*this)[this->size () - 1];
… …
687 { 716 {
688 erase (&obj); 717 erase (&obj);
689 } 718 }
690}; 719};
691 720
721/////////////////////////////////////////////////////////////////////////////
722
723// something like a vector or stack, but without
724// out of bounds checking
725template<typename T>
726struct fixed_stack
727{
728 T *data;
729 int size;
730 int max;
731
732 fixed_stack ()
733 : size (0), data (0)
734 {
735 }
736
737 fixed_stack (int max)
738 : size (0), max (max)
739 {
740 data = salloc<T> (max);
741 }
742
743 void reset (int new_max)
744 {
745 sfree (data, max);
746 size = 0;
747 max = new_max;
748 data = salloc<T> (max);
749 }
750
751 void free ()
752 {
753 sfree (data, max);
754 data = 0;
755 }
756
757 ~fixed_stack ()
758 {
759 sfree (data, max);
760 }
761
762 T &operator[](int idx)
763 {
764 return data [idx];
765 }
766
767 void push (T v)
768 {
769 data [size++] = v;
770 }
771
772 T &pop ()
773 {
774 return data [--size];
775 }
776
777 T remove (int idx)
778 {
779 T v = data [idx];
780
781 data [idx] = data [--size];
782
783 return v;
784 }
785};
786
787/////////////////////////////////////////////////////////////////////////////
788
692// basically does what strncpy should do, but appends "..." to strings exceeding length 789// basically does what strncpy should do, but appends "..." to strings exceeding length
693// returns the number of bytes actually used (including \0) 790// returns the number of bytes actually used (including \0)
694int assign (char *dst, const char *src, int maxsize); 791int assign (char *dst, const char *src, int maxsize);
695 792
696// type-safe version of assign 793// type-safe version of assign
… …
705// return current time as timestamp 802// return current time as timestamp
706tstamp now (); 803tstamp now ();
707 804
708int similar_direction (int a, int b); 805int similar_direction (int a, int b);
709 806
710// like sprintf, but returns a "static" buffer 807// like v?sprintf, but returns a "static" buffer
711const char *format (const char *format, ...); 808char *vformat (const char *format, va_list ap);
809char *format (const char *format, ...) ecb_attribute ((format (printf, 1, 2)));
712 810
713// safety-check player input which will become object->msg 811// safety-check player input which will become object->msg
714bool msg_is_safe (const char *msg); 812bool msg_is_safe (const char *msg);
715 813
716///////////////////////////////////////////////////////////////////////////// 814/////////////////////////////////////////////////////////////////////////////

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