[ViewVC] Diff of: cvs/deliantra/server/include/util.h

Comparing deliantra/server/include/util.h (file contents):
Revision 1.46 by root, Mon May 28 21:15:56 2007 UTC vs.
Revision 1.126 by root, Sat Nov 17 23:33:18 2018 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 (©) 2005,2006,2007,2008,2009,2010,2011,2012,2013,2014,2015,2016 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 it under
7	* under the terms of the GNU General Public License as published by the Free	7	* the terms of the Affero GNU General Public License as published by the
8	* Software Foundation; either version 2 of the License, or (at your option)	8	* Free Software Foundation, either version 3 of the License, or (at your
9	* any later version.	9	* 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 Affero GNU General Public License
17	* with Crossfire TRT; if not, write to the Free Software Foundation, Inc. 51	17	* and the GNU General Public License along with this program. If not, see
18	* Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA	18	* <http://www.gnu.org/licenses/>.
19	*	19	*
20	* The authors can be reached via e-mail to <crossfire@schmorp.de>	20	* The authors can be reached via e-mail to <support@deliantra.net>
21	*/	21	*/
22		22
23	#ifndef UTIL_H__	23	#ifndef UTIL_H__
24	#define UTIL_H__	24	#define UTIL_H__
25		25
26	//#define PREFER_MALLOC	26	#include <compiler.h>
27		27
28	#if __GNUC__ >= 3	28	#define DEBUG_POISON 0x00 // poison memory before freeing it if != 0
29	# define is_constant(c) __builtin_constant_p (c)	29	#define DEBUG_SALLOC 0 // add a debug wrapper around all sallocs
30	# define expect(expr,value) __builtin_expect ((expr),(value))	30	#define PREFER_MALLOC 0 // use malloc and not the slice allocator
31	# define prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
32	#else
33	# define is_constant(c) 0
34	# define expect(expr,value) (expr)
35	# define prefetch(addr,rw,locality)
36	#endif
37		31
38	// put into ifs if you are very sure that the expression	32	#include <pthread.h>
39	// is mostly true or mosty false. note that these return
40	// booleans, not the expression.
41	#define expect_false(expr) expect ((expr) != 0, 0)
42	#define expect_true(expr) expect ((expr) != 0, 1)
43		33
44	#include <cstddef>	34	#include <cstddef>
45	#include <cmath>	35	#include <cmath>
46	#include <new>	36	#include <new>
47	#include <vector>	37	#include <vector>
49	#include <glib.h>	39	#include <glib.h>
50		40
51	#include <shstr.h>	41	#include <shstr.h>
52	#include <traits.h>	42	#include <traits.h>
53		43
		44	#if DEBUG_SALLOC
		45	# define g_slice_alloc0(s) debug_slice_alloc0(s)
		46	# define g_slice_alloc(s) debug_slice_alloc(s)
		47	# define g_slice_free1(s,p) debug_slice_free1(s,p)
		48	void *g_slice_alloc (unsigned long size);
		49	void *g_slice_alloc0 (unsigned long size);
		50	void g_slice_free1 (unsigned long size, void *ptr);
		51	#elif PREFER_MALLOC
		52	# define g_slice_alloc0(s) calloc (1, (s))
		53	# define g_slice_alloc(s) malloc ((s))
		54	# define g_slice_free1(s,p) free ((p))
		55	#endif
		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
		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)
		62	template<typename T, int N>
		63	static 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
57	// very ugly macro that basicaly declares and initialises a variable	71	// very ugly macro that basically declares and initialises a variable
58	// that is in scope for the next statement only	72	// that is in scope for the next statement only
59	// 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
60	// (note: works great for pointers)	74	// (note: works great for pointers)
61	// most ugly macro I ever wrote	75	// most ugly macro I ever wrote
62	#define declvar(type, name, value) if (type name = 0) { } else if (((name) = (value)), 1)	76	#define statementvar(type, name, value) if (type name = 0) { } else if (((name) = (value)), 1)
63		77
64	// in range including end	78	// in range including end
65	#define IN_RANGE_INC(val,beg,end) \	79	#define IN_RANGE_INC(val,beg,end) \
66	((unsigned int)(val) - (unsigned int)(beg) <= (unsigned int)(end) - (unsigned int)(beg))	80	((unsigned int)(val) - (unsigned int)(beg) <= (unsigned int)(end) - (unsigned int)(beg))
67		81
68	// in range excluding end	82	// in range excluding end
69	#define IN_RANGE_EXC(val,beg,end) \	83	#define IN_RANGE_EXC(val,beg,end) \
70	((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))
71		85
		86	ecb_cold void cleanup (const char *cause, bool make_core = false);
72	void fork_abort (const char *msg);	87	ecb_cold void fork_abort (const char *msg);
73		88
74	// 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,
75	// 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.
76	template<typename T, typename U> static inline T min (T a, U b) { return (U)a < b ? (U)a : b; }	91	template<typename T, typename U> static inline T min (T a, U b) { return a < (T)b ? a : (T)b; }
77	template<typename T, typename U> static inline T max (T a, U b) { return (U)a > b ? (U)a : b; }	92	template<typename T, typename U> static inline T max (T a, U b) { return a > (T)b ? a : (T)b; }
78	template<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; }	93	template<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; }
79		94
		95	template<typename T, typename U> static inline void min_it (T &v, U m) { v = min (v, (T)m); }
		96	template<typename T, typename U> static inline void max_it (T &v, U m) { v = max (v, (T)m); }
		97	template<typename T, typename U, typename V> static inline void clamp_it (T &v, U a, V b) { v = clamp (v, (T)a, (T)b); }
		98
80	template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; }	99	template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; }
81		100
		101	template<typename T, typename U, typename V> static inline T min (T a, U b, V c) { return min (a, min (b, c)); }
		102	template<typename T, typename U, typename V> static inline T max (T a, U b, V c) { return max (a, max (b, c)); }
		103
		104	// sign returns -1 or +1
		105	template<typename T>
		106	static inline T sign (T v) { return v < 0 ? -1 : +1; }
		107	// relies on 2c representation
		108	template<>
		109	inline sint8 sign (sint8 v) { return 1 - (sint8 (uint8 (v) >> 7) * 2); }
		110	template<>
		111	inline sint16 sign (sint16 v) { return 1 - (sint16 (uint16 (v) >> 15) * 2); }
		112	template<>
		113	inline sint32 sign (sint32 v) { return 1 - (sint32 (uint32 (v) >> 31) * 2); }
		114
		115	// sign0 returns -1, 0 or +1
		116	template<typename T>
		117	static inline T sign0 (T v) { return v ? sign (v) : 0; }
		118
		119	//clashes with C++0x
		120	template<typename T, typename U>
		121	static inline T copysign (T a, U b) { return a > 0 ? b : -b; }
		122
		123	// div* only work correctly for div > 0
		124	// div, with correct rounding (< 0.5 downwards, >=0.5 upwards)
		125	template<typename T> static inline T div (T val, T div)
		126	{
		127	return expect_false (val < 0) ? - ((-val + (div - 1) / 2) / div) : (val + div / 2) / div;
		128	}
		129
		130	template<> inline float div (float val, float div) { return val / div; }
		131	template<> inline double div (double val, double div) { return val / div; }
		132
		133	// div, round-up
		134	template<typename T> static inline T div_ru (T val, T div)
		135	{
		136	return expect_false (val < 0) ? - ((-val ) / div) : (val + div - 1) / div;
		137	}
		138	// div, round-down
		139	template<typename T> static inline T div_rd (T val, T div)
		140	{
		141	return expect_false (val < 0) ? - ((-val + (div - 1) ) / div) : (val ) / div;
		142	}
		143
		144	// lerp* only work correctly for min_in < max_in
		145	// Linear intERPolate, scales val from min_in..max_in to min_out..max_out
82	template<typename T>	146	template<typename T>
83	static inline T	147	static inline T
84	lerp (T val, T min_in, T max_in, T min_out, T max_out)	148	lerp (T val, T min_in, T max_in, T min_out, T max_out)
85	{	149	{
86	return (val - min_in) * (max_out - min_out) / (max_in - min_in) + min_out;	150	return min_out + div <T> ((val - min_in) * (max_out - min_out), max_in - min_in);
		151	}
		152
		153	// lerp, round-down
		154	template<typename T>
		155	static inline T
		156	lerp_rd (T val, T min_in, T max_in, T min_out, T max_out)
		157	{
		158	return min_out + div_rd<T> ((val - min_in) * (max_out - min_out), max_in - min_in);
		159	}
		160
		161	// lerp, round-up
		162	template<typename T>
		163	static inline T
		164	lerp_ru (T val, T min_in, T max_in, T min_out, T max_out)
		165	{
		166	return min_out + div_ru<T> ((val - min_in) * (max_out - min_out), max_in - min_in);
87	}	167	}
88		168
89	// lots of stuff taken from FXT	169	// lots of stuff taken from FXT
90		170
91	/* Rotate right. This is used in various places for checksumming */	171	/* Rotate right. This is used in various places for checksumming */
…		…
129	int32_t d = b - a;	209	int32_t d = b - a;
130	d &= d >> 31;	210	d &= d >> 31;
131	return b - d;	211	return b - d;
132	}	212	}
133		213
134	// this is much faster than crossfires original algorithm	214	// this is much faster than crossfire's original algorithm
135	// on modern cpus	215	// on modern cpus
136	inline int	216	inline int
137	isqrt (int n)	217	isqrt (int n)
138	{	218	{
139	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
		224	inline bool
		225	logical_xor (bool a, bool b)
		226	{
		227	return a != b;
		228	}
		229
		230	inline bool
		231	logical_implies (bool a, bool b)
		232	{
		233	return a <= b;
140	}	234	}
141		235
142	// this is only twice as fast as naive sqrtf (dxdy+dydy)	236	// this is only twice as fast as naive sqrtf (dxdy+dydy)
143	#if 0	237	#if 0
144	// 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.
145	#else	239	#else
146	// 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.
147	#endif	241	#endif
148	inline int	242	inline int
149	idistance (int dx, int dy)	243	idistance (int dx, int dy)
150	{	244	{
151	unsigned int dx_ = abs (dx);	245	unsigned int dx_ = abs (dx);
152	unsigned int dy_ = abs (dy);	246	unsigned int dy_ = abs (dy);
153		247
154	#if 0	248	#if 0
155	return dx_ > dy_	249	return dx_ > dy_
…		…
158	#else	252	#else
159	return dx_ + dy_ - min (dx_, dy_) * 5 / 8;	253	return dx_ + dy_ - min (dx_, dy_) * 5 / 8;
160	#endif	254	#endif
161	}	255	}
162		256
		257	// can be substantially faster than floor, if your value range allows for it
		258	template<typename T>
		259	inline T
		260	fastfloor (T x)
		261	{
		262	return std::floor (x);
		263	}
		264
		265	inline float
		266	fastfloor (float x)
		267	{
		268	return sint32(x) - (x < 0);
		269	}
		270
		271	inline double
		272	fastfloor (double x)
		273	{
		274	return sint64(x) - (x < 0);
		275	}
		276
163	/*	277	/*
164	* absdir(int): Returns a number between 1 and 8, which represent	278	* absdir(int): Returns a number between 1 and 8, which represent
165	* the "absolute" direction of a number (it actually takes care of	279	* the "absolute" direction of a number (it actually takes care of
166	* "overflow" in previous calculations of a direction).	280	* "overflow" in previous calculations of a direction).
167	*/	281	*/
…		…
169	absdir (int d)	283	absdir (int d)
170	{	284	{
171	return ((d - 1) & 7) + 1;	285	return ((d - 1) & 7) + 1;
172	}	286	}
173		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
		292	extern ssize_t slice_alloc; // statistics
		293
		294	void *salloc_ (int n);
		295	void salloc_ (int n, void src);
		296
		297	// strictly the same as g_slice_alloc, but never returns 0
		298	template<typename T>
		299	inline T salloc (int n = 1) { return (T )salloc_ (n * sizeof (T)); }
		300
		301	// also copies src into the new area, like "memdup"
		302	// if src is 0, clears the memory
		303	template<typename T>
		304	inline T salloc (int n, T src) { return (T )salloc_ (n sizeof (T), (void *)src); }
		305
		306	// clears the memory
		307	template<typename T>
		308	inline T salloc0(int n = 1) { return (T )salloc_ (n * sizeof (T), 0); }
		309
		310	// for symmetry
		311	template<typename T>
		312	inline void sfree (T *ptr, int n = 1) noexcept
		313	{
		314	if (expect_true (ptr))
		315	{
		316	slice_alloc -= n * sizeof (T);
		317	if (DEBUG_POISON) memset (ptr, DEBUG_POISON, n * sizeof (T));
		318	g_slice_free1 (n * sizeof (T), (void *)ptr);
		319	}
		320	}
		321
		322	// nulls the pointer
		323	template<typename T>
		324	inline void sfree0 (T *&ptr, int n = 1) noexcept
		325	{
		326	sfree<T> (ptr, n);
		327	ptr = 0;
		328	}
		329
174	// makes dynamically allocated objects zero-initialised	330	// makes dynamically allocated objects zero-initialised
175	struct zero_initialised	331	struct zero_initialised
176	{	332	{
177	void operator new (size_t s, void p)	333	void operator new (size_t s, void p)
178	{	334	{
…		…
180	return p;	336	return p;
181	}	337	}
182		338
183	void *operator new (size_t s)	339	void *operator new (size_t s)
184	{	340	{
185	return g_slice_alloc0 (s);	341	return salloc0<char> (s);
186	}	342	}
187		343
188	void *operator new[] (size_t s)	344	void *operator new[] (size_t s)
189	{	345	{
190	return g_slice_alloc0 (s);	346	return salloc0<char> (s);
191	}	347	}
192		348
193	void operator delete (void *p, size_t s)	349	void operator delete (void *p, size_t s)
194	{	350	{
195	g_slice_free1 (s, p);	351	sfree ((char *)p, s);
196	}	352	}
197		353
198	void operator delete[] (void *p, size_t s)	354	void operator delete[] (void *p, size_t s)
199	{	355	{
200	g_slice_free1 (s, p);	356	sfree ((char *)p, s);
201	}	357	}
202	};	358	};
203		359
204	void *salloc_ (int n) throw (std::bad_alloc);	360	// makes dynamically allocated objects zero-initialised
205	void salloc_ (int n, void src) throw (std::bad_alloc);	361	struct slice_allocated
206
207	// strictly the same as g_slice_alloc, but never returns 0
208	template<typename T>
209	inline T salloc (int n = 1) throw (std::bad_alloc) { return (T )salloc_ (n * sizeof (T)); }
210
211	// also copies src into the new area, like "memdup"
212	// if src is 0, clears the memory
213	template<typename T>
214	inline T salloc (int n, T src) throw (std::bad_alloc) { return (T )salloc_ (n sizeof (T), (void *)src); }
215
216	// clears the memory
217	template<typename T>
218	inline T salloc0(int n = 1) throw (std::bad_alloc) { return (T )salloc_ (n * sizeof (T), 0); }
219
220	// for symmetry
221	template<typename T>
222	inline void sfree (T *ptr, int n = 1) throw ()
223	{	362	{
224	#ifdef PREFER_MALLOC	363	void operator new (size_t s, void p)
225	free (ptr);	364	{
226	#else	365	return p;
227	g_slice_free1 (n * sizeof (T), (void *)ptr);	366	}
228	#endif	367
229	}	368	void *operator new (size_t s)
		369	{
		370	return salloc<char> (s);
		371	}
		372
		373	void *operator new[] (size_t s)
		374	{
		375	return salloc<char> (s);
		376	}
		377
		378	void operator delete (void *p, size_t s)
		379	{
		380	sfree ((char *)p, s);
		381	}
		382
		383	void operator delete[] (void *p, size_t s)
		384	{
		385	sfree ((char *)p, s);
		386	}
		387	};
230		388
231	// a STL-compatible allocator that uses g_slice	389	// a STL-compatible allocator that uses g_slice
232	// boy, this is verbose	390	// boy, this is verbose
233	template<typename Tp>	391	template<typename Tp>
234	struct slice_allocator	392	struct slice_allocator
…		…
239	typedef const Tp *const_pointer;	397	typedef const Tp *const_pointer;
240	typedef Tp &reference;	398	typedef Tp &reference;
241	typedef const Tp &const_reference;	399	typedef const Tp &const_reference;
242	typedef Tp value_type;	400	typedef Tp value_type;
243		401
244	template <class U>	402	template <class U>
245	struct rebind	403	struct rebind
246	{	404	{
247	typedef slice_allocator<U> other;	405	typedef slice_allocator<U> other;
248	};	406	};
249		407
250	slice_allocator () throw () { }	408	slice_allocator () noexcept { }
251	slice_allocator (const slice_allocator &o) throw () { }	409	slice_allocator (const slice_allocator &) noexcept { }
252	template<typename Tp2>	410	template<typename Tp2>
253	slice_allocator (const slice_allocator<Tp2> &) throw () { }	411	slice_allocator (const slice_allocator<Tp2> &) noexcept { }
254		412
255	~slice_allocator () { }	413	~slice_allocator () { }
256		414
257	pointer address (reference x) const { return &x; }	415	pointer address (reference x) const { return &x; }
258	const_pointer address (const_reference x) const { return &x; }	416	const_pointer address (const_reference x) const { return &x; }
…		…
265	void deallocate (pointer p, size_type n)	423	void deallocate (pointer p, size_type n)
266	{	424	{
267	sfree<Tp> (p, n);	425	sfree<Tp> (p, n);
268	}	426	}
269		427
270	size_type max_size ()const throw ()	428	size_type max_size () const noexcept
271	{	429	{
272	return size_t (-1) / sizeof (Tp);	430	return size_t (-1) / sizeof (Tp);
273	}	431	}
274		432
275	void construct (pointer p, const Tp &val)	433	void construct (pointer p, const Tp &val)
…		…
281	{	439	{
282	p->~Tp ();	440	p->~Tp ();
283	}	441	}
284	};	442	};
285		443
286	// P. L'Ecuyer, “Maximally Equidistributed Combined Tausworthe Generators”, Mathematics of Computation, 65, 213 (1996), 203–213.	444	// basically a memory area, but refcounted
287	// http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme.ps	445	struct refcnt_buf
288	// http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme2.ps
289	struct tausworthe_random_generator
290	{	446	{
291	// generator	447	char *data;
292	uint32_t state [4];
293		448
294	void operator =(const tausworthe_random_generator &src)	449	refcnt_buf (size_t size = 0);
295	{	450	refcnt_buf (void *data, size_t size);
296	state [0] = src.state [0];
297	state [1] = src.state [1];
298	state [2] = src.state [2];
299	state [3] = src.state [3];
300	}
301		451
302	void seed (uint32_t seed);	452	refcnt_buf (const refcnt_buf &src)
303	uint32_t next ();
304
305	// uniform distribution
306	uint32_t operator ()(uint32_t num)
307	{	453	{
308	return is_constant (num)	454	data = src.data;
309	? (next () * (uint64_t)num) >> 32U	455	inc ();
310	: get_range (num);
311	}	456	}
312		457
313	// return a number within (min .. max)	458	~refcnt_buf ();
314	int operator () (int r_min, int r_max)
315	{
316	return is_constant (r_min) && is_constant (r_max) && r_min <= r_max
317	? r_min + operator ()(r_max - r_min + 1)
318	: get_range (r_min, r_max);
319	}
320		459
321	double operator ()()	460	refcnt_buf &operator =(const refcnt_buf &src);
		461
		462	operator char *()
322	{	463	{
323	return this->next () / (double)0xFFFFFFFFU;	464	return data;
		465	}
		466
		467	size_t size () const
		468	{
		469	return _size ();
324	}	470	}
325		471
326	protected:	472	protected:
327	uint32_t get_range (uint32_t r_max);	473	enum {
328	int get_range (int r_min, int r_max);	474	overhead = sizeof (uint32_t) * 2
329	};	475	};
330		476
331	typedef tausworthe_random_generator rand_gen;	477	uint32_t &_size () const
		478	{
		479	return ((unsigned int *)data)[-2];
		480	}
332		481
333	extern rand_gen 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	};
		507
		508	INTERFACE_CLASS (attachable)
		509	struct refcnt_base
		510	{
		511	typedef int refcnt_t;
		512	mutable refcnt_t ACC (RW, refcnt);
		513
		514	MTH void refcnt_inc () const { ++refcnt; }
		515	MTH void refcnt_dec () const { --refcnt; }
		516
		517	refcnt_base () : refcnt (0) { }
		518	};
		519
		520	// to avoid branches with more advanced compilers
		521	extern refcnt_base::refcnt_t refcnt_dummy;
334		522
335	template<class T>	523	template<class T>
336	struct refptr	524	struct refptr
337	{	525	{
		526	// p if not null
		527	refcnt_base::refcnt_t *refcnt_ref () { return p ? &p->refcnt : &refcnt_dummy; }
		528
		529	void refcnt_dec ()
		530	{
		531	if (!ecb_is_constant (p))
		532	--*refcnt_ref ();
		533	else if (p)
		534	--p->refcnt;
		535	}
		536
		537	void refcnt_inc ()
		538	{
		539	if (!ecb_is_constant (p))
		540	++*refcnt_ref ();
		541	else if (p)
		542	++p->refcnt;
		543	}
		544
338	T *p;	545	T *p;
339		546
340	refptr () : p(0) { }	547	refptr () : p(0) { }
341	refptr (const refptr<T> &p) : p(p.p) { if (p) p->refcnt_inc (); }	548	refptr (const refptr<T> &p) : p(p.p) { refcnt_inc (); }
342	refptr (T *p) : p(p) { if (p) p->refcnt_inc (); }	549	refptr (T *p) : p(p) { refcnt_inc (); }
343	~refptr () { if (p) p->refcnt_dec (); }	550	~refptr () { refcnt_dec (); }
344		551
345	const refptr<T> &operator =(T *o)	552	const refptr<T> &operator =(T *o)
346	{	553	{
		554	// if decrementing ever destroys we need to reverse the order here
347	if (p) p->refcnt_dec ();	555	refcnt_dec ();
348	p = o;	556	p = o;
349	if (p) p->refcnt_inc ();	557	refcnt_inc ();
350
351	return *this;	558	return *this;
352	}	559	}
353		560
354	const refptr<T> &operator =(const refptr<T> o)	561	const refptr<T> &operator =(const refptr<T> &o)
355	{	562	{
356	*this = o.p;	563	*this = o.p;
357	return *this;	564	return *this;
358	}	565	}
359		566
360	T &operator * () const { return *p; }	567	T &operator * () const { return *p; }
361	T *operator ->() const { return p; }	568	T *operator ->() const { return p; }
362		569
363	operator T *() const { return p; }	570	operator T *() const { return p; }
364	};	571	};
365		572
366	typedef refptr<maptile> maptile_ptr;	573	typedef refptr<maptile> maptile_ptr;
367	typedef refptr<object> object_ptr;	574	typedef refptr<object> object_ptr;
368	typedef refptr<archetype> arch_ptr;	575	typedef refptr<archetype> arch_ptr;
369	typedef refptr<client> client_ptr;	576	typedef refptr<client> client_ptr;
370	typedef refptr<player> player_ptr;	577	typedef refptr<player> player_ptr;
		578	typedef refptr<region> region_ptr;
		579
		580	#define STRHSH_NULL 2166136261
		581
		582	static inline uint32_t
		583	strhsh (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
		599	static inline uint32_t
		600	memhsh (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	}
371		609
372	struct str_hash	610	struct str_hash
373	{	611	{
374	std::size_t operator ()(const char *s) const	612	std::size_t operator ()(const char *s) const
375	{	613	{
376	unsigned long hash = 0;
377
378	/* use the one-at-a-time hash function, which supposedly is
379	* better than the djb2-like one used by perl5.005, but
380	* certainly is better then the bug used here before.
381	* see http://burtleburtle.net/bob/hash/doobs.html
382	*/
383	while (*s)
384	{
385	hash += *s++;
386	hash += hash << 10;
387	hash ^= hash >> 6;
388	}
389
390	hash += hash << 3;
391	hash ^= hash >> 11;
392	hash += hash << 15;
393
394	return hash;	614	return strhsh (s);
		615	}
		616
		617	std::size_t operator ()(const shstr &s) const
		618	{
		619	return strhsh (s);
395	}	620	}
396	};	621	};
397		622
398	struct str_equal	623	struct str_equal
399	{	624	{
…		…
401	{	626	{
402	return !strcmp (a, b);	627	return !strcmp (a, b);
403	}	628	}
404	};	629	};
405		630
		631	// Mostly the same as std::vector, but insert/erase can reorder
		632	// the elements, making append(=insert)/remove O(1) instead of O(n).
		633	//
		634	// NOTE: only some forms of erase are available
406	template<class T>	635	template<class T>
407	struct unordered_vector : std::vector<T, slice_allocator<T> >	636	struct unordered_vector : std::vector<T, slice_allocator<T> >
408	{	637	{
409	typedef typename unordered_vector::iterator iterator;	638	typedef typename unordered_vector::iterator iterator;
410		639
…		…
420	{	649	{
421	erase ((unsigned int )(i - this->begin ()));	650	erase ((unsigned int )(i - this->begin ()));
422	}	651	}
423	};	652	};
424		653
425	template<class T, int T::* index>	654	// This container blends advantages of linked lists
		655	// (efficiency) with vectors (random access) by
		656	// using an unordered vector and storing the vector
		657	// index inside the object.
		658	//
		659	// + memory-efficient on most 64 bit archs
		660	// + O(1) insert/remove
		661	// + free unique (but varying) id for inserted objects
		662	// + cache-friendly iteration
		663	// - only works for pointers to structs
		664	//
		665	// NOTE: only some forms of erase/insert are available
		666	typedef int object_vector_index;
		667
		668	template<class T, object_vector_index T::*indexmember>
426	struct object_vector : std::vector<T , slice_allocator<T > >	669	struct object_vector : std::vector<T , slice_allocator<T > >
427	{	670	{
		671	typedef typename object_vector::iterator iterator;
		672
		673	bool contains (const T *obj) const
		674	{
		675	return obj->*indexmember;
		676	}
		677
		678	iterator find (const T *obj)
		679	{
		680	return obj->*indexmember
		681	? this->begin () + obj->*indexmember - 1
		682	: this->end ();
		683	}
		684
		685	void push_back (T *obj)
		686	{
		687	std::vector<T , slice_allocator<T > >::push_back (obj);
		688	obj->*indexmember = this->size ();
		689	}
		690
428	void insert (T *obj)	691	void insert (T *obj)
429	{	692	{
430	assert (!(obj->*index));
431	push_back (obj);	693	push_back (obj);
432	obj->*index = this->size ();
433	}	694	}
434		695
435	void insert (T &obj)	696	void insert (T &obj)
436	{	697	{
437	insert (&obj);	698	insert (&obj);
438	}	699	}
439		700
440	void erase (T *obj)	701	void erase (T *obj)
441	{	702	{
442	assert (obj->*index);	703	object_vector_index pos = obj->*indexmember;
443	unsigned int pos = obj->*index;
444	obj->*index = 0;	704	obj->*indexmember = 0;
445		705
446	if (pos < this->size ())	706	if (pos < this->size ())
447	{	707	{
448	(this)[pos - 1] = (this)[this->size () - 1];	708	(this)[pos - 1] = (this)[this->size () - 1];
449	(this)[pos - 1]->index = pos;	709	(this)[pos - 1]->indexmember = pos;
450	}	710	}
451		711
452	this->pop_back ();	712	this->pop_back ();
453	}	713	}
454		714
455	void erase (T &obj)	715	void erase (T &obj)
456	{	716	{
457	errase (&obj);	717	erase (&obj);
458	}	718	}
459	};	719	};
		720
		721	/////////////////////////////////////////////////////////////////////////////
		722
		723	// something like a vector or stack, but without
		724	// out of bounds checking
		725	template<typename T>
		726	struct 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	/////////////////////////////////////////////////////////////////////////////
460		788
461	// 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
		790	// returns the number of bytes actually used (including \0)
462	void assign (char dst, const char src, int maxlen);	791	int assign (char dst, const char src, int maxsize);
463		792
464	// type-safe version of assign	793	// type-safe version of assign
465	template<int N>	794	template<int N>
466	inline void assign (char (&dst)[N], const char *src)	795	inline int assign (char (&dst)[N], const char *src)
467	{	796	{
468	assign ((char *)&dst, src, N);	797	return assign ((char *)&dst, src, N);
469	}	798	}
470		799
471	typedef double tstamp;	800	typedef double tstamp;
472		801
473	// return current time as timestampe	802	// return current time as timestamp
474	tstamp now ();	803	tstamp now ();
475		804
476	int similar_direction (int a, int b);	805	int similar_direction (int a, int b);
477		806
478	// like printf, but returns a std::string	807	// like v?sprintf, but returns a "static" buffer
479	const std::string format (const char *format, ...);	808	char vformat (const char format, va_list ap);
		809	char format (const char format, ...) ecb_attribute ((format (printf, 1, 2)));
480		810
		811	// safety-check player input which will become object->msg
		812	bool msg_is_safe (const char *msg);
		813
		814	/////////////////////////////////////////////////////////////////////////////
		815	// threads, very very thin wrappers around pthreads
		816
		817	struct thread
		818	{
		819	pthread_t id;
		820
		821	void start (void (start_routine)(void ), void arg = 0);
		822
		823	void cancel ()
		824	{
		825	pthread_cancel (id);
		826	}
		827
		828	void *join ()
		829	{
		830	void *ret;
		831
		832	if (pthread_join (id, &ret))
		833	cleanup ("pthread_join failed", 1);
		834
		835	return ret;
		836	}
		837	};
		838
		839	// note that mutexes are not classes
		840	typedef pthread_mutex_t smutex;
		841
		842	#if __linux && defined (PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP)
		843	#define SMUTEX_INITIALISER PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP
		844	#else
		845	#define SMUTEX_INITIALISER PTHREAD_MUTEX_INITIALIZER
481	#endif	846	#endif
482		847
		848	#define SMUTEX(name) smutex name = SMUTEX_INITIALISER
		849	#define SMUTEX_LOCK(name) pthread_mutex_lock (&(name))
		850	#define SMUTEX_UNLOCK(name) pthread_mutex_unlock (&(name))
		851
		852	typedef pthread_cond_t scond;
		853
		854	#define SCOND(name) scond name = PTHREAD_COND_INITIALIZER
		855	#define SCOND_SIGNAL(name) pthread_cond_signal (&(name))
		856	#define SCOND_BROADCAST(name) pthread_cond_broadcast (&(name))
		857	#define SCOND_WAIT(name,mutex) pthread_cond_wait (&(name), &(mutex))
		858
		859	#endif
		860

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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 1.126 by root, Sat Nov 17 23:33:18 2018 UTC

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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 1.126 by root, Sat Nov 17 23:33:18 2018 UTC