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

Comparing deliantra/server/include/util.h (file contents):
Revision 1.33 by root, Thu Jan 18 22:20:00 2007 UTC vs.
Revision 1.95 by root, Tue Nov 10 00:01:31 2009 UTC

…		…
		1	/*
		2	* This file is part of Deliantra, the Roguelike Realtime MMORPG.
		3	*
		4	* Copyright (©) 2005,2006,2007,2008 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
		5	*
		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
		8	* Free Software Foundation, either version 3 of the License, or (at your
		9	* option) any later version.
		10	*
		11	* This program is distributed in the hope that it will be useful,
		12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
		13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
		14	* GNU General Public License for more details.
		15	*
		16	* You should have received a copy of the Affero GNU General Public License
		17	* and the GNU General Public License along with this program. If not, see
		18	* <http://www.gnu.org/licenses/>.
		19	*
		20	* The authors can be reached via e-mail to <support@deliantra.net>
		21	*/
		22
1	#ifndef UTIL_H__	23	#ifndef UTIL_H__
2	#define UTIL_H__	24	#define UTIL_H__
3		25
4	#if __GNUC__ >= 3	26	#include <compiler.h>
5	# define is_constant(c) __builtin_constant_p (c)	27
6	#else	28	#define DEBUG_POISON 0x00 // poison memory before freeing it if != 0
7	# define is_constant(c) 0	29	#define DEBUG_SALLOC 0 // add a debug wrapper around all sallocs
8	#endif	30	#define PREFER_MALLOC 0 // use malloc and not the slice allocator
		31
		32	#include <pthread.h>
9		33
10	#include <cstddef>	34	#include <cstddef>
11	#include <cmath>	35	#include <cmath>
12	#include <new>	36	#include <new>
13	#include <vector>	37	#include <vector>
15	#include <glib.h>	39	#include <glib.h>
16		40
17	#include <shstr.h>	41	#include <shstr.h>
18	#include <traits.h>	42	#include <traits.h>
19		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
20	// 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)
21	#define AUTODECL(var,expr) typeof(expr) var = (expr)	58	#define auto(var,expr) decltype(expr) var = (expr)
22		59
23	// very ugly macro that basicaly declares and initialises a variable	60	// very ugly macro that basically declares and initialises a variable
24	// that is in scope for the next statement only	61	// that is in scope for the next statement only
25	// 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
26	// (note: works great for pointers)	63	// (note: works great for pointers)
27	// most ugly macro I ever wrote	64	// most ugly macro I ever wrote
28	#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)
29		66
30	// in range including end	67	// in range including end
31	#define IN_RANGE_INC(val,beg,end) \	68	#define IN_RANGE_INC(val,beg,end) \
32	((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))
33		70
34	// in range excluding end	71	// in range excluding end
35	#define IN_RANGE_EXC(val,beg,end) \	72	#define IN_RANGE_EXC(val,beg,end) \
36	((unsigned int)(val) - (unsigned int)(beg) < (unsigned int)(end) - (unsigned int)(beg))	73	((unsigned int)(val) - (unsigned int)(beg) < (unsigned int)(end) - (unsigned int)(beg))
37		74
		75	void cleanup (const char *cause, bool make_core = false);
38	void fork_abort (const char *msg);	76	void fork_abort (const char *msg);
39		77
		78	// rationale for using (U) not (T) is to reduce signed/unsigned issues,
		79	// as a is often a constant while b is the variable. it is still a bug, though.
40	template<typename T, typename U> static inline T min (T a, U b) { return a < (T)b ? a : (T)b; }	80	template<typename T, typename U> static inline T min (T a, U b) { return (U)a < b ? (U)a : b; }
41	template<typename T, typename U> static inline T max (T a, U b) { return a > (T)b ? a : (T)b; }	81	template<typename T, typename U> static inline T max (T a, U b) { return (U)a > b ? (U)a : b; }
42	template<typename T, typename U, typename V> static inline T clamp (T v, U a, V b) { return v < (T)a ? a : v >(T)b ? b : v; }	82	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; }
		83
		84	template<typename T, typename U> static inline void min_it (T &v, U m) { v = min (v, (T)m); }
		85	template<typename T, typename U> static inline void max_it (T &v, U m) { v = max (v, (T)m); }
		86	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); }
43		87
44	template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; }	88	template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; }
45		89
		90	template<typename T, typename U, typename V> static inline T min (T a, U b, V c) { return min (a, min (b, c)); }
		91	template<typename T, typename U, typename V> static inline T max (T a, U b, V c) { return max (a, max (b, c)); }
		92
		93	// sign returns -1 or +1
		94	template<typename T>
		95	static inline T sign (T v) { return v < 0 ? -1 : +1; }
		96	// relies on 2c representation
		97	template<>
		98	inline sint8 sign (sint8 v) { return 1 - (sint8 (uint8 (v) >> 7) * 2); }
		99
		100	// sign0 returns -1, 0 or +1
		101	template<typename T>
		102	static inline T sign0 (T v) { return v ? sign (v) : 0; }
		103
		104	// div* only work correctly for div > 0
		105	// div, with correct rounding (< 0.5 downwards, >=0.5 upwards)
		106	template<typename T> static inline T div (T val, T div)
		107	{
		108	return expect_false (val < 0) ? - ((-val + (div - 1) / 2) / div) : (val + div / 2) / div;
		109	}
		110	// div, round-up
		111	template<typename T> static inline T div_ru (T val, T div)
		112	{
		113	return expect_false (val < 0) ? - ((-val ) / div) : (val + div - 1) / div;
		114	}
		115	// div, round-down
		116	template<typename T> static inline T div_rd (T val, T div)
		117	{
		118	return expect_false (val < 0) ? - ((-val + (div - 1) ) / div) : (val ) / div;
		119	}
		120
		121	// lerp* only work correctly for min_in < max_in
		122	// Linear intERPolate, scales val from min_in..max_in to min_out..max_out
		123	template<typename T>
		124	static inline T
		125	lerp (T val, T min_in, T max_in, T min_out, T max_out)
		126	{
		127	return min_out + div <T> ((val - min_in) * (max_out - min_out), max_in - min_in);
		128	}
		129
		130	// lerp, round-down
		131	template<typename T>
		132	static inline T
		133	lerp_rd (T val, T min_in, T max_in, T min_out, T max_out)
		134	{
		135	return min_out + div_rd<T> ((val - min_in) * (max_out - min_out), max_in - min_in);
		136	}
		137
		138	// lerp, round-up
		139	template<typename T>
		140	static inline T
		141	lerp_ru (T val, T min_in, T max_in, T min_out, T max_out)
		142	{
		143	return min_out + div_ru<T> ((val - min_in) * (max_out - min_out), max_in - min_in);
		144	}
		145
		146	// lots of stuff taken from FXT
		147
		148	/* Rotate right. This is used in various places for checksumming */
		149	//TODO: that sucks, use a better checksum algo
		150	static inline uint32_t
		151	rotate_right (uint32_t c, uint32_t count = 1)
		152	{
		153	return (c << (32 - count)) \| (c >> count);
		154	}
		155
		156	static inline uint32_t
		157	rotate_left (uint32_t c, uint32_t count = 1)
		158	{
		159	return (c >> (32 - count)) \| (c << count);
		160	}
		161
		162	// Return abs(a-b)
		163	// Both a and b must not have the most significant bit set
		164	static inline uint32_t
		165	upos_abs_diff (uint32_t a, uint32_t b)
		166	{
		167	long d1 = b - a;
		168	long d2 = (d1 & (d1 >> 31)) << 1;
		169
		170	return d1 - d2; // == (b - d) - (a + d);
		171	}
		172
		173	// Both a and b must not have the most significant bit set
		174	static inline uint32_t
		175	upos_min (uint32_t a, uint32_t b)
		176	{
		177	int32_t d = b - a;
		178	d &= d >> 31;
		179	return a + d;
		180	}
		181
		182	// Both a and b must not have the most significant bit set
		183	static inline uint32_t
		184	upos_max (uint32_t a, uint32_t b)
		185	{
		186	int32_t d = b - a;
		187	d &= d >> 31;
		188	return b - d;
		189	}
		190
46	// this is much faster than crossfires original algorithm	191	// this is much faster than crossfire's original algorithm
47	// on modern cpus	192	// on modern cpus
48	inline int	193	inline int
49	isqrt (int n)	194	isqrt (int n)
50	{	195	{
51	return (int)sqrtf ((float)n);	196	return (int)sqrtf ((float)n);
		197	}
		198
		199	// this is kind of like the ^^ operator, if it would exist, without sequence point.
		200	// more handy than it looks like, due to the implicit !! done on its arguments
		201	inline bool
		202	logical_xor (bool a, bool b)
		203	{
		204	return a != b;
		205	}
		206
		207	inline bool
		208	logical_implies (bool a, bool b)
		209	{
		210	return a <= b;
52	}	211	}
53		212
54	// this is only twice as fast as naive sqrtf (dxdy+dydy)	213	// this is only twice as fast as naive sqrtf (dxdy+dydy)
55	#if 0	214	#if 0
56	// and has a max. error of 6 in the range -100..+100.	215	// and has a max. error of 6 in the range -100..+100.
…		…
81	absdir (int d)	240	absdir (int d)
82	{	241	{
83	return ((d - 1) & 7) + 1;	242	return ((d - 1) & 7) + 1;
84	}	243	}
85		244
		245	extern ssize_t slice_alloc; // statistics
		246
		247	void *salloc_ (int n) throw (std::bad_alloc);
		248	void salloc_ (int n, void src) throw (std::bad_alloc);
		249
		250	// strictly the same as g_slice_alloc, but never returns 0
		251	template<typename T>
		252	inline T salloc (int n = 1) throw (std::bad_alloc) { return (T )salloc_ (n * sizeof (T)); }
		253
		254	// also copies src into the new area, like "memdup"
		255	// if src is 0, clears the memory
		256	template<typename T>
		257	inline T salloc (int n, T src) throw (std::bad_alloc) { return (T )salloc_ (n sizeof (T), (void *)src); }
		258
		259	// clears the memory
		260	template<typename T>
		261	inline T salloc0(int n = 1) throw (std::bad_alloc) { return (T )salloc_ (n * sizeof (T), 0); }
		262
		263	// for symmetry
		264	template<typename T>
		265	inline void sfree (T *ptr, int n = 1) throw ()
		266	{
		267	if (expect_true (ptr))
		268	{
		269	slice_alloc -= n * sizeof (T);
		270	if (DEBUG_POISON) memset (ptr, DEBUG_POISON, n * sizeof (T));
		271	g_slice_free1 (n * sizeof (T), (void *)ptr);
		272	assert (slice_alloc >= 0);//D
		273	}
		274	}
		275
		276	// nulls the pointer
		277	template<typename T>
		278	inline void sfree0 (T *&ptr, int n = 1) throw ()
		279	{
		280	sfree<T> (ptr, n);
		281	ptr = 0;
		282	}
		283
86	// makes dynamically allocated objects zero-initialised	284	// makes dynamically allocated objects zero-initialised
87	struct zero_initialised	285	struct zero_initialised
88	{	286	{
89	void operator new (size_t s, void p)	287	void operator new (size_t s, void p)
90	{	288	{
…		…
92	return p;	290	return p;
93	}	291	}
94		292
95	void *operator new (size_t s)	293	void *operator new (size_t s)
96	{	294	{
97	return g_slice_alloc0 (s);	295	return salloc0<char> (s);
98	}	296	}
99		297
100	void *operator new[] (size_t s)	298	void *operator new[] (size_t s)
101	{	299	{
102	return g_slice_alloc0 (s);	300	return salloc0<char> (s);
103	}	301	}
104		302
105	void operator delete (void *p, size_t s)	303	void operator delete (void *p, size_t s)
106	{	304	{
107	g_slice_free1 (s, p);	305	sfree ((char *)p, s);
108	}	306	}
109		307
110	void operator delete[] (void *p, size_t s)	308	void operator delete[] (void *p, size_t s)
111	{	309	{
112	g_slice_free1 (s, p);	310	sfree ((char *)p, s);
113	}	311	}
114	};	312	};
115		313
116	void *salloc_ (int n) throw (std::bad_alloc);	314	// makes dynamically allocated objects zero-initialised
117	void salloc_ (int n, void src) throw (std::bad_alloc);	315	struct slice_allocated
118
119	// strictly the same as g_slice_alloc, but never returns 0
120	template<typename T>
121	inline T salloc (int n = 1) throw (std::bad_alloc) { return (T )salloc_ (n * sizeof (T)); }
122
123	// also copies src into the new area, like "memdup"
124	// if src is 0, clears the memory
125	template<typename T>
126	inline T salloc (int n, T src) throw (std::bad_alloc) { return (T )salloc_ (n sizeof (T), (void *)src); }
127
128	// clears the memory
129	template<typename T>
130	inline T salloc0(int n = 1) throw (std::bad_alloc) { return (T )salloc_ (n * sizeof (T), 0); }
131
132	// for symmetry
133	template<typename T>
134	inline void sfree (T *ptr, int n = 1) throw ()
135	{	316	{
136	g_slice_free1 (n * sizeof (T), (void *)ptr);	317	void operator new (size_t s, void p)
137	}	318	{
		319	return p;
		320	}
		321
		322	void *operator new (size_t s)
		323	{
		324	return salloc<char> (s);
		325	}
		326
		327	void *operator new[] (size_t s)
		328	{
		329	return salloc<char> (s);
		330	}
		331
		332	void operator delete (void *p, size_t s)
		333	{
		334	sfree ((char *)p, s);
		335	}
		336
		337	void operator delete[] (void *p, size_t s)
		338	{
		339	sfree ((char *)p, s);
		340	}
		341	};
138		342
139	// a STL-compatible allocator that uses g_slice	343	// a STL-compatible allocator that uses g_slice
140	// boy, this is verbose	344	// boy, this is verbose
141	template<typename Tp>	345	template<typename Tp>
142	struct slice_allocator	346	struct slice_allocator
…		…
154	{	358	{
155	typedef slice_allocator<U> other;	359	typedef slice_allocator<U> other;
156	};	360	};
157		361
158	slice_allocator () throw () { }	362	slice_allocator () throw () { }
159	slice_allocator (const slice_allocator &o) throw () { }	363	slice_allocator (const slice_allocator &) throw () { }
160	template<typename Tp2>	364	template<typename Tp2>
161	slice_allocator (const slice_allocator<Tp2> &) throw () { }	365	slice_allocator (const slice_allocator<Tp2> &) throw () { }
162		366
163	~slice_allocator () { }	367	~slice_allocator () { }
164		368
…		…
173	void deallocate (pointer p, size_type n)	377	void deallocate (pointer p, size_type n)
174	{	378	{
175	sfree<Tp> (p, n);	379	sfree<Tp> (p, n);
176	}	380	}
177		381
178	size_type max_size ()const throw ()	382	size_type max_size () const throw ()
179	{	383	{
180	return size_t (-1) / sizeof (Tp);	384	return size_t (-1) / sizeof (Tp);
181	}	385	}
182		386
183	void construct (pointer p, const Tp &val)	387	void construct (pointer p, const Tp &val)
…		…
196	// http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme2.ps	400	// http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme2.ps
197	struct tausworthe_random_generator	401	struct tausworthe_random_generator
198	{	402	{
199	uint32_t state [4];	403	uint32_t state [4];
200		404
201	tausworthe_random_generator (uint32_t seed);	405	void operator =(const tausworthe_random_generator &src)
		406	{
		407	state [0] = src.state [0];
		408	state [1] = src.state [1];
		409	state [2] = src.state [2];
		410	state [3] = src.state [3];
		411	}
		412
		413	void seed (uint32_t seed);
202	uint32_t next ();	414	uint32_t next ();
		415	};
203		416
		417	// Xorshift RNGs, George Marsaglia
		418	// http://www.jstatsoft.org/v08/i14/paper
		419	// this one is about 40% faster than the tausworthe one above (i.e. not much),
		420	// despite the inlining, and has the issue of only creating 2**32-1 numbers.
		421	// see also http://www.iro.umontreal.ca/~lecuyer/myftp/papers/xorshift.pdf
		422	struct xorshift_random_generator
		423	{
		424	uint32_t x, y;
		425
		426	void operator =(const xorshift_random_generator &src)
		427	{
		428	x = src.x;
		429	y = src.y;
		430	}
		431
		432	void seed (uint32_t seed)
		433	{
		434	x = seed;
		435	y = seed * 69069U;
		436	}
		437
		438	uint32_t next ()
		439	{
		440	uint32_t t = x ^ (x << 10);
		441	x = y;
		442	y = y ^ (y >> 13) ^ t ^ (t >> 10);
		443	return y;
		444	}
		445	};
		446
		447	template<class generator>
		448	struct random_number_generator : generator
		449	{
		450	// uniform distribution, 0 .. max (0, num - 1)
204	uint32_t operator ()(uint32_t r_max)	451	uint32_t operator ()(uint32_t num)
205	{	452	{
206	return next () % r_max;	453	return !is_constant (num) ? get_range (num) // non-constant
		454	: num & (num - 1) ? (this->next () * (uint64_t)num) >> 32U // constant, non-power-of-two
		455	: this->next () & (num - 1); // constant, power-of-two
207	}	456	}
208		457
209	// return a number within (min .. max)	458	// return a number within (min .. max)
210	int operator () (int r_min, int r_max)	459	int operator () (int r_min, int r_max)
211	{	460	{
212	return r_min + (*this) (max (r_max - r_min + 1, 1));	461	return is_constant (r_min) && is_constant (r_max) && r_min <= r_max
		462	? r_min + operator ()(r_max - r_min + 1)
		463	: get_range (r_min, r_max);
213	}	464	}
214		465
215	double operator ()()	466	double operator ()()
216	{	467	{
217	return next () / (double)0xFFFFFFFFU;	468	return this->next () / (double)0xFFFFFFFFU;
218	}	469	}
219	};
220		470
		471	protected:
		472	uint32_t get_range (uint32_t r_max);
		473	int get_range (int r_min, int r_max);
		474	};
		475
221	typedef tausworthe_random_generator rand_gen;	476	typedef random_number_generator<tausworthe_random_generator> rand_gen;
222		477
223	extern rand_gen rndm;	478	extern rand_gen rndm, rmg_rndm;
		479
		480	INTERFACE_CLASS (attachable)
		481	struct refcnt_base
		482	{
		483	typedef int refcnt_t;
		484	mutable refcnt_t ACC (RW, refcnt);
		485
		486	MTH void refcnt_inc () const { ++refcnt; }
		487	MTH void refcnt_dec () const { --refcnt; }
		488
		489	refcnt_base () : refcnt (0) { }
		490	};
		491
		492	// to avoid branches with more advanced compilers
		493	extern refcnt_base::refcnt_t refcnt_dummy;
224		494
225	template<class T>	495	template<class T>
226	struct refptr	496	struct refptr
227	{	497	{
		498	// p if not null
		499	refcnt_base::refcnt_t *refcnt_ref () { return p ? &p->refcnt : &refcnt_dummy; }
		500
		501	void refcnt_dec ()
		502	{
		503	if (!is_constant (p))
		504	--*refcnt_ref ();
		505	else if (p)
		506	--p->refcnt;
		507	}
		508
		509	void refcnt_inc ()
		510	{
		511	if (!is_constant (p))
		512	++*refcnt_ref ();
		513	else if (p)
		514	++p->refcnt;
		515	}
		516
228	T *p;	517	T *p;
229		518
230	refptr () : p(0) { }	519	refptr () : p(0) { }
231	refptr (const refptr<T> &p) : p(p.p) { if (p) p->refcnt_inc (); }	520	refptr (const refptr<T> &p) : p(p.p) { refcnt_inc (); }
232	refptr (T *p) : p(p) { if (p) p->refcnt_inc (); }	521	refptr (T *p) : p(p) { refcnt_inc (); }
233	~refptr () { if (p) p->refcnt_dec (); }	522	~refptr () { refcnt_dec (); }
234		523
235	const refptr<T> &operator =(T *o)	524	const refptr<T> &operator =(T *o)
236	{	525	{
		526	// if decrementing ever destroys we need to reverse the order here
237	if (p) p->refcnt_dec ();	527	refcnt_dec ();
238	p = o;	528	p = o;
239	if (p) p->refcnt_inc ();	529	refcnt_inc ();
240
241	return *this;	530	return *this;
242	}	531	}
243		532
244	const refptr<T> &operator =(const refptr<T> o)	533	const refptr<T> &operator =(const refptr<T> &o)
245	{	534	{
246	*this = o.p;	535	*this = o.p;
247	return *this;	536	return *this;
248	}	537	}
249		538
250	T &operator * () const { return *p; }	539	T &operator * () const { return *p; }
251	T *operator ->() const { return p; }	540	T *operator ->() const { return p; }
252		541
253	operator T *() const { return p; }	542	operator T *() const { return p; }
254	};	543	};
255		544
256	typedef refptr<maptile> maptile_ptr;	545	typedef refptr<maptile> maptile_ptr;
257	typedef refptr<object> object_ptr;	546	typedef refptr<object> object_ptr;
258	typedef refptr<archetype> arch_ptr;	547	typedef refptr<archetype> arch_ptr;
259	typedef refptr<client> client_ptr;	548	typedef refptr<client> client_ptr;
260	typedef refptr<player> player_ptr;	549	typedef refptr<player> player_ptr;
261		550
		551	#define STRHSH_NULL 2166136261
		552
		553	static inline uint32_t
		554	strhsh (const char *s)
		555	{
		556	// use FNV-1a hash (http://isthe.com/chongo/tech/comp/fnv/)
		557	// it is about twice as fast as the one-at-a-time one,
		558	// with good distribution.
		559	// FNV-1a is faster on many cpus because the multiplication
		560	// runs concurrently with the looping logic.
		561	uint32_t hash = STRHSH_NULL;
		562
		563	while (*s)
		564	hash = (hash ^ s++) 16777619;
		565
		566	return hash;
		567	}
		568
		569	static inline uint32_t
		570	memhsh (const char *s, size_t len)
		571	{
		572	uint32_t hash = STRHSH_NULL;
		573
		574	while (len--)
		575	hash = (hash ^ s++) 16777619;
		576
		577	return hash;
		578	}
		579
262	struct str_hash	580	struct str_hash
263	{	581	{
264	std::size_t operator ()(const char *s) const	582	std::size_t operator ()(const char *s) const
265	{	583	{
266	unsigned long hash = 0;
267
268	/* use the one-at-a-time hash function, which supposedly is
269	* better than the djb2-like one used by perl5.005, but
270	* certainly is better then the bug used here before.
271	* see http://burtleburtle.net/bob/hash/doobs.html
272	*/
273	while (*s)
274	{
275	hash += *s++;
276	hash += hash << 10;
277	hash ^= hash >> 6;
278	}
279
280	hash += hash << 3;
281	hash ^= hash >> 11;
282	hash += hash << 15;
283
284	return hash;	584	return strhsh (s);
		585	}
		586
		587	std::size_t operator ()(const shstr &s) const
		588	{
		589	return strhsh (s);
285	}	590	}
286	};	591	};
287		592
288	struct str_equal	593	struct str_equal
289	{	594	{
…		…
291	{	596	{
292	return !strcmp (a, b);	597	return !strcmp (a, b);
293	}	598	}
294	};	599	};
295		600
		601	// Mostly the same as std::vector, but insert/erase can reorder
		602	// the elements, making append(=insert)/remove O(1) instead of O(n).
		603	//
		604	// NOTE: only some forms of erase are available
296	template<class T>	605	template<class T>
297	struct unordered_vector : std::vector<T, slice_allocator<T> >	606	struct unordered_vector : std::vector<T, slice_allocator<T> >
298	{	607	{
299	typedef typename unordered_vector::iterator iterator;	608	typedef typename unordered_vector::iterator iterator;
300		609
…		…
310	{	619	{
311	erase ((unsigned int )(i - this->begin ()));	620	erase ((unsigned int )(i - this->begin ()));
312	}	621	}
313	};	622	};
314		623
315	template<class T, int T::* index>	624	// This container blends advantages of linked lists
		625	// (efficiency) with vectors (random access) by
		626	// by using an unordered vector and storing the vector
		627	// index inside the object.
		628	//
		629	// + memory-efficient on most 64 bit archs
		630	// + O(1) insert/remove
		631	// + free unique (but varying) id for inserted objects
		632	// + cache-friendly iteration
		633	// - only works for pointers to structs
		634	//
		635	// NOTE: only some forms of erase/insert are available
		636	typedef int object_vector_index;
		637
		638	template<class T, object_vector_index T::*indexmember>
316	struct object_vector : std::vector<T , slice_allocator<T > >	639	struct object_vector : std::vector<T , slice_allocator<T > >
317	{	640	{
		641	typedef typename object_vector::iterator iterator;
		642
		643	bool contains (const T *obj) const
		644	{
		645	return obj->*indexmember;
		646	}
		647
		648	iterator find (const T *obj)
		649	{
		650	return obj->*indexmember
		651	? this->begin () + obj->*indexmember - 1
		652	: this->end ();
		653	}
		654
		655	void push_back (T *obj)
		656	{
		657	std::vector<T , slice_allocator<T > >::push_back (obj);
		658	obj->*indexmember = this->size ();
		659	}
		660
318	void insert (T *obj)	661	void insert (T *obj)
319	{	662	{
320	assert (!(obj->*index));
321	push_back (obj);	663	push_back (obj);
322	obj->*index = this->size ();
323	}	664	}
324		665
325	void insert (T &obj)	666	void insert (T &obj)
326	{	667	{
327	insert (&obj);	668	insert (&obj);
328	}	669	}
329		670
330	void erase (T *obj)	671	void erase (T *obj)
331	{	672	{
332	assert (obj->*index);
333	int pos = obj->*index;	673	unsigned int pos = obj->*indexmember;
334	obj->*index = 0;	674	obj->*indexmember = 0;
335		675
336	if (pos < this->size ())	676	if (pos < this->size ())
337	{	677	{
338	(this)[pos - 1] = (this)[this->size () - 1];	678	(this)[pos - 1] = (this)[this->size () - 1];
339	(this)[pos - 1]->index = pos;	679	(this)[pos - 1]->indexmember = pos;
340	}	680	}
341		681
342	this->pop_back ();	682	this->pop_back ();
343	}	683	}
344		684
345	void erase (T &obj)	685	void erase (T &obj)
346	{	686	{
347	errase (&obj);	687	erase (&obj);
348	}	688	}
349	};	689	};
350		690
351	// basically does what strncpy should do, but appends "..." to strings exceeding length	691	// basically does what strncpy should do, but appends "..." to strings exceeding length
		692	// returns the number of bytes actually used (including \0)
352	void assign (char dst, const char src, int maxlen);	693	int assign (char dst, const char src, int maxsize);
353		694
354	// type-safe version of assign	695	// type-safe version of assign
355	template<int N>	696	template<int N>
356	inline void assign (char (&dst)[N], const char *src)	697	inline int assign (char (&dst)[N], const char *src)
357	{	698	{
358	assign ((char *)&dst, src, N);	699	return assign ((char *)&dst, src, N);
359	}	700	}
360		701
361	typedef double tstamp;	702	typedef double tstamp;
362		703
363	// return current time as timestampe	704	// return current time as timestamp
364	tstamp now ();	705	tstamp now ();
365		706
366	int similar_direction (int a, int b);	707	int similar_direction (int a, int b);
367		708
		709	// like v?sprintf, but returns a "static" buffer
		710	char vformat (const char format, va_list ap);
		711	char format (const char format, ...) attribute ((format (printf, 1, 2)));
		712
		713	// safety-check player input which will become object->msg
		714	bool msg_is_safe (const char *msg);
		715
		716	/////////////////////////////////////////////////////////////////////////////
		717	// threads, very very thin wrappers around pthreads
		718
		719	struct thread
		720	{
		721	pthread_t id;
		722
		723	void start (void (start_routine)(void ), void arg = 0);
		724
		725	void cancel ()
		726	{
		727	pthread_cancel (id);
		728	}
		729
		730	void *join ()
		731	{
		732	void *ret;
		733
		734	if (pthread_join (id, &ret))
		735	cleanup ("pthread_join failed", 1);
		736
		737	return ret;
		738	}
		739	};
		740
		741	// note that mutexes are not classes
		742	typedef pthread_mutex_t smutex;
		743
		744	#if __linux && defined (PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP)
		745	#define SMUTEX_INITIALISER PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP
		746	#else
		747	#define SMUTEX_INITIALISER PTHREAD_MUTEX_INITIALIZER
368	#endif	748	#endif
369		749
		750	#define SMUTEX(name) smutex name = SMUTEX_INITIALISER
		751	#define SMUTEX_LOCK(name) pthread_mutex_lock (&(name))
		752	#define SMUTEX_UNLOCK(name) pthread_mutex_unlock (&(name))
		753
		754	typedef pthread_cond_t scond;
		755
		756	#define SCOND(name) scond name = PTHREAD_COND_INITIALIZER
		757	#define SCOND_SIGNAL(name) pthread_cond_signal (&(name))
		758	#define SCOND_BROADCAST(name) pthread_cond_broadcast (&(name))
		759	#define SCOND_WAIT(name,mutex) pthread_cond_wait (&(name), &(mutex))
		760
		761	#endif
		762

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Comparing deliantra/server/include/util.h (file contents): Revision 1.33 by root, Thu Jan 18 22:20:00 2007 UTC vs. Revision 1.95 by root, Tue Nov 10 00:01:31 2009 UTC

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Comparing deliantra/server/include/util.h (file contents):
Revision 1.33 by root, Thu Jan 18 22:20:00 2007 UTC vs.
Revision 1.95 by root, Tue Nov 10 00:01:31 2009 UTC