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Comparing deliantra/server/include/util.h (file contents):
Revision 1.46 by root, Mon May 28 21:15:56 2007 UTC vs.
Revision 1.58 by root, Thu Nov 8 19:43:25 2007 UTC

1/* 1/*
2 * This file is part of Crossfire TRT, the Multiplayer Online Role Playing Game. 2 * This file is part of Deliantra, the Roguelike Realtime MMORPG.
3 * 3 *
4 * Copyright (©) 2005,2006,2007 Marc Alexander Lehmann / Robin Redeker / the Crossfire TRT team 4 * Copyright (©) 2005,2006,2007 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
5 * 5 *
6 * Crossfire TRT is free software; you can redistribute it and/or modify it 6 * Deliantra is free software: you can redistribute it and/or modify
7 * under the terms of the GNU General Public License as published by the Free 7 * it under the terms of the GNU General Public License as published by
8 * Software Foundation; either version 2 of the License, or (at your option) 8 * the Free Software Foundation, either version 3 of the License, or
9 * any later version. 9 * (at your option) any later version.
10 * 10 *
11 * This program is distributed in the hope that it will be useful, but 11 * This program is distributed in the hope that it will be useful,
12 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * 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 along 16 * You should have received a copy of the GNU General Public License
17 * with Crossfire TRT; if not, write to the Free Software Foundation, Inc. 51 17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 * 18 *
20 * The authors can be reached via e-mail to <crossfire@schmorp.de> 19 * The authors can be reached via e-mail to <support@deliantra.net>
21 */ 20 */
22 21
23#ifndef UTIL_H__ 22#ifndef UTIL_H__
24#define UTIL_H__ 23#define UTIL_H__
25 24
… …
33# define is_constant(c) 0 32# define is_constant(c) 0
34# define expect(expr,value) (expr) 33# define expect(expr,value) (expr)
35# define prefetch(addr,rw,locality) 34# define prefetch(addr,rw,locality)
36#endif 35#endif
37 36
37#if __GNUC__ < 4 || (__GNUC__ == 4 || __GNUC_MINOR__ < 4)
38# define decltype(x) typeof(x)
39#endif
40
38// put into ifs if you are very sure that the expression 41// put into ifs if you are very sure that the expression
39// is mostly true or mosty false. note that these return 42// is mostly true or mosty false. note that these return
40// booleans, not the expression. 43// booleans, not the expression.
41#define expect_false(expr) expect ((expr) != 0, 0) 44#define expect_false(expr) expect ((expr) != 0, 0)
42#define expect_true(expr) expect ((expr) != 0, 1) 45#define expect_true(expr) expect ((expr) != 0, 1)
… …
49#include <glib.h> 52#include <glib.h>
50 53
51#include <shstr.h> 54#include <shstr.h>
52#include <traits.h> 55#include <traits.h>
53 56
54// use a gcc extension for auto declarations until ISO C++ sanctifies them 57// use C0X decltype for auto declarations until ISO C++ sanctifies them (if ever)
55#define auto(var,expr) typeof(expr) var = (expr) 58#define auto(var,expr) decltype(expr) var = (expr)
56 59
57// very ugly macro that basicaly declares and initialises a variable 60// very ugly macro that basicaly declares and initialises a variable
58// that is in scope for the next statement only 61// that is in scope for the next statement only
59// works only for stuff that can be assigned 0 and converts to false 62// works only for stuff that can be assigned 0 and converts to false
60// (note: works great for pointers) 63// (note: works great for pointers)
61// most ugly macro I ever wrote 64// most ugly macro I ever wrote
62#define declvar(type, name, value) if (type name = 0) { } else if (((name) = (value)), 1) 65#define statementvar(type, name, value) if (type name = 0) { } else if (((name) = (value)), 1)
63 66
64// in range including end 67// in range including end
65#define IN_RANGE_INC(val,beg,end) \ 68#define IN_RANGE_INC(val,beg,end) \
66 ((unsigned int)(val) - (unsigned int)(beg) <= (unsigned int)(end) - (unsigned int)(beg)) 69 ((unsigned int)(val) - (unsigned int)(beg) <= (unsigned int)(end) - (unsigned int)(beg))
67 70
… …
169absdir (int d) 172absdir (int d)
170{ 173{
171 return ((d - 1) & 7) + 1; 174 return ((d - 1) & 7) + 1;
172} 175}
173 176
177extern size_t slice_alloc; // statistics
178
174// makes dynamically allocated objects zero-initialised 179// makes dynamically allocated objects zero-initialised
175struct zero_initialised 180struct zero_initialised
176{ 181{
177 void *operator new (size_t s, void *p) 182 void *operator new (size_t s, void *p)
178 { 183 {
… …
180 return p; 185 return p;
181 } 186 }
182 187
183 void *operator new (size_t s) 188 void *operator new (size_t s)
184 { 189 {
190 slice_alloc += s;
185 return g_slice_alloc0 (s); 191 return g_slice_alloc0 (s);
186 } 192 }
187 193
188 void *operator new[] (size_t s) 194 void *operator new[] (size_t s)
189 { 195 {
196 slice_alloc += s;
190 return g_slice_alloc0 (s); 197 return g_slice_alloc0 (s);
191 } 198 }
192 199
193 void operator delete (void *p, size_t s) 200 void operator delete (void *p, size_t s)
194 { 201 {
202 slice_alloc -= s;
195 g_slice_free1 (s, p); 203 g_slice_free1 (s, p);
196 } 204 }
197 205
198 void operator delete[] (void *p, size_t s) 206 void operator delete[] (void *p, size_t s)
199 { 207 {
208 slice_alloc -= s;
200 g_slice_free1 (s, p); 209 g_slice_free1 (s, p);
201 } 210 }
202}; 211};
203 212
204void *salloc_ (int n) throw (std::bad_alloc); 213void *salloc_ (int n) throw (std::bad_alloc);
… …
222inline void sfree (T *ptr, int n = 1) throw () 231inline void sfree (T *ptr, int n = 1) throw ()
223{ 232{
224#ifdef PREFER_MALLOC 233#ifdef PREFER_MALLOC
225 free (ptr); 234 free (ptr);
226#else 235#else
236 slice_alloc -= n * sizeof (T);
227 g_slice_free1 (n * sizeof (T), (void *)ptr); 237 g_slice_free1 (n * sizeof (T), (void *)ptr);
228#endif 238#endif
229} 239}
230 240
231// a STL-compatible allocator that uses g_slice 241// a STL-compatible allocator that uses g_slice
… …
330 340
331typedef tausworthe_random_generator rand_gen; 341typedef tausworthe_random_generator rand_gen;
332 342
333extern rand_gen rndm; 343extern rand_gen rndm;
334 344
345INTERFACE_CLASS (attachable)
346struct refcnt_base
347{
348 typedef int refcnt_t;
349 mutable refcnt_t ACC (RW, refcnt);
350
351 MTH void refcnt_inc () const { ++refcnt; }
352 MTH void refcnt_dec () const { --refcnt; }
353
354 refcnt_base () : refcnt (0) { }
355};
356
357// to avoid branches with more advanced compilers
358extern refcnt_base::refcnt_t refcnt_dummy;
359
335template<class T> 360template<class T>
336struct refptr 361struct refptr
337{ 362{
363 // p if not null
364 refcnt_base::refcnt_t *refcnt_ref () { return p ? &p->refcnt : &refcnt_dummy; }
365
366 void refcnt_dec ()
367 {
368 if (!is_constant (p))
369 --*refcnt_ref ();
370 else if (p)
371 --p->refcnt;
372 }
373
374 void refcnt_inc ()
375 {
376 if (!is_constant (p))
377 ++*refcnt_ref ();
378 else if (p)
379 ++p->refcnt;
380 }
381
338 T *p; 382 T *p;
339 383
340 refptr () : p(0) { } 384 refptr () : p(0) { }
341 refptr (const refptr<T> &p) : p(p.p) { if (p) p->refcnt_inc (); } 385 refptr (const refptr<T> &p) : p(p.p) { refcnt_inc (); }
342 refptr (T *p) : p(p) { if (p) p->refcnt_inc (); } 386 refptr (T *p) : p(p) { refcnt_inc (); }
343 ~refptr () { if (p) p->refcnt_dec (); } 387 ~refptr () { refcnt_dec (); }
344 388
345 const refptr<T> &operator =(T *o) 389 const refptr<T> &operator =(T *o)
346 { 390 {
391 // if decrementing ever destroys we need to reverse the order here
347 if (p) p->refcnt_dec (); 392 refcnt_dec ();
348 p = o; 393 p = o;
349 if (p) p->refcnt_inc (); 394 refcnt_inc ();
350
351 return *this; 395 return *this;
352 } 396 }
353 397
354 const refptr<T> &operator =(const refptr<T> o) 398 const refptr<T> &operator =(const refptr<T> &o)
355 { 399 {
356 *this = o.p; 400 *this = o.p;
357 return *this; 401 return *this;
358 } 402 }
359 403
360 T &operator * () const { return *p; } 404 T &operator * () const { return *p; }
361 T *operator ->() const { return p; } 405 T *operator ->() const { return p; }
362 406
363 operator T *() const { return p; } 407 operator T *() const { return p; }
364}; 408};
365 409
366typedef refptr<maptile> maptile_ptr; 410typedef refptr<maptile> maptile_ptr;
… …
401 { 445 {
402 return !strcmp (a, b); 446 return !strcmp (a, b);
403 } 447 }
404}; 448};
405 449
450// Mostly the same as std::vector, but insert/erase can reorder
451// the elements, making append(=insert)/remove O(1) instead of O(n).
452//
453// NOTE: only some forms of erase are available
406template<class T> 454template<class T>
407struct unordered_vector : std::vector<T, slice_allocator<T> > 455struct unordered_vector : std::vector<T, slice_allocator<T> >
408{ 456{
409 typedef typename unordered_vector::iterator iterator; 457 typedef typename unordered_vector::iterator iterator;
410 458
… …
420 { 468 {
421 erase ((unsigned int )(i - this->begin ())); 469 erase ((unsigned int )(i - this->begin ()));
422 } 470 }
423}; 471};
424 472
425template<class T, int T::* index> 473// This container blends advantages of linked lists
474// (efficiency) with vectors (random access) by
475// by using an unordered vector and storing the vector
476// index inside the object.
477//
478// + memory-efficient on most 64 bit archs
479// + O(1) insert/remove
480// + free unique (but varying) id for inserted objects
481// + cache-friendly iteration
482// - only works for pointers to structs
483//
484// NOTE: only some forms of erase/insert are available
485typedef int object_vector_index;
486
487template<class T, object_vector_index T::*indexmember>
426struct object_vector : std::vector<T *, slice_allocator<T *> > 488struct object_vector : std::vector<T *, slice_allocator<T *> >
427{ 489{
490 typedef typename object_vector::iterator iterator;
491
492 bool contains (const T *obj) const
493 {
494 return obj->*indexmember;
495 }
496
497 iterator find (const T *obj)
498 {
499 return obj->*indexmember
500 ? this->begin () + obj->*indexmember - 1
501 : this->end ();
502 }
503
504 void push_back (T *obj)
505 {
506 std::vector<T *, slice_allocator<T *> >::push_back (obj);
507 obj->*indexmember = this->size ();
508 }
509
428 void insert (T *obj) 510 void insert (T *obj)
429 { 511 {
430 assert (!(obj->*index));
431 push_back (obj); 512 push_back (obj);
432 obj->*index = this->size ();
433 } 513 }
434 514
435 void insert (T &obj) 515 void insert (T &obj)
436 { 516 {
437 insert (&obj); 517 insert (&obj);
438 } 518 }
439 519
440 void erase (T *obj) 520 void erase (T *obj)
441 { 521 {
442 assert (obj->*index);
443 unsigned int pos = obj->*index; 522 unsigned int pos = obj->*indexmember;
444 obj->*index = 0; 523 obj->*indexmember = 0;
445 524
446 if (pos < this->size ()) 525 if (pos < this->size ())
447 { 526 {
448 (*this)[pos - 1] = (*this)[this->size () - 1]; 527 (*this)[pos - 1] = (*this)[this->size () - 1];
449 (*this)[pos - 1]->*index = pos; 528 (*this)[pos - 1]->*indexmember = pos;
450 } 529 }
451 530
452 this->pop_back (); 531 this->pop_back ();
453 } 532 }
454 533
455 void erase (T &obj) 534 void erase (T &obj)
456 { 535 {
457 errase (&obj); 536 erase (&obj);
458 } 537 }
459}; 538};
460 539
461// basically does what strncpy should do, but appends "..." to strings exceeding length 540// basically does what strncpy should do, but appends "..." to strings exceeding length
462void assign (char *dst, const char *src, int maxlen); 541void assign (char *dst, const char *src, int maxlen);
… …
473// return current time as timestampe 552// return current time as timestampe
474tstamp now (); 553tstamp now ();
475 554
476int similar_direction (int a, int b); 555int similar_direction (int a, int b);
477 556
478// like printf, but returns a std::string 557// like sprintf, but returns a "static" buffer
479const std::string format (const char *format, ...); 558const char *format (const char *format, ...);
480 559
481#endif 560#endif
482 561

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