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

Comparing deliantra/server/include/util.h (file contents):
Revision 1.37 by root, Thu Feb 15 15:43:36 2007 UTC vs.
Revision 1.117 by root, Tue Jan 3 11:23:41 2012 UTC

…		…
		1	/*
		2	* This file is part of Deliantra, the Roguelike Realtime MMORPG.
		3	*
		4	* Copyright (©) 2005,2006,2007,2008,2009,2010,2011 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	//#define PREFER_MALLOC	26	#include <compiler.h>
5		27
6	#if __GNUC__ >= 3	28	#define DEBUG_POISON 0x00 // poison memory before freeing it if != 0
7	# define is_constant(c) __builtin_constant_p (c)	29	#define DEBUG_SALLOC 0 // add a debug wrapper around all sallocs
8	#else	30	#define PREFER_MALLOC 0 // use malloc and not the slice allocator
9	# define is_constant(c) 0	31
10	#endif	32	#include <pthread.h>
11		33
12	#include <cstddef>	34	#include <cstddef>
13	#include <cmath>	35	#include <cmath>
14	#include <new>	36	#include <new>
15	#include <vector>	37	#include <vector>
17	#include <glib.h>	39	#include <glib.h>
18		40
19	#include <shstr.h>	41	#include <shstr.h>
20	#include <traits.h>	42	#include <traits.h>
21		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
22	// 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)
23	#define AUTODECL(var,expr) typeof(expr) var = (expr)	58	#define auto(var,expr) decltype(expr) var = (expr)
24		59
		60	#if cplusplus_does_not_suck
		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
25	// very ugly macro that basicaly declares and initialises a variable	71	// very ugly macro that basically declares and initialises a variable
26	// that is in scope for the next statement only	72	// that is in scope for the next statement only
27	// 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
28	// (note: works great for pointers)	74	// (note: works great for pointers)
29	// most ugly macro I ever wrote	75	// most ugly macro I ever wrote
30	#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)
31		77
32	// in range including end	78	// in range including end
33	#define IN_RANGE_INC(val,beg,end) \	79	#define IN_RANGE_INC(val,beg,end) \
34	((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))
35		81
36	// in range excluding end	82	// in range excluding end
37	#define IN_RANGE_EXC(val,beg,end) \	83	#define IN_RANGE_EXC(val,beg,end) \
38	((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))
39		85
		86	void cleanup (const char *cause, bool make_core = false);
40	void fork_abort (const char *msg);	87	void fork_abort (const char *msg);
41		88
42	// 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,
43	// 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.
44	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; }
45	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; }
46	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; }
47		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
48	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; }
49		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
		146	template<typename T>
		147	static inline T
		148	lerp (T val, T min_in, T max_in, T min_out, T max_out)
		149	{
		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);
		167	}
		168
50	// lots of stuff taken from FXT	169	// lots of stuff taken from FXT
51		170
52	/* Rotate right. This is used in various places for checksumming */	171	/* Rotate right. This is used in various places for checksumming */
53	//TODO: this sucks, use a better checksum algo	172	//TODO: that sucks, use a better checksum algo
54	static inline uint32_t	173	static inline uint32_t
55	rotate_right (uint32_t c)	174	rotate_right (uint32_t c, uint32_t count = 1)
56	{	175	{
57	return (c << 31) \| (c >> 1);	176	return (c << (32 - count)) \| (c >> count);
		177	}
		178
		179	static inline uint32_t
		180	rotate_left (uint32_t c, uint32_t count = 1)
		181	{
		182	return (c >> (32 - count)) \| (c << count);
58	}	183	}
59		184
60	// Return abs(a-b)	185	// Return abs(a-b)
61	// Both a and b must not have the most significant bit set	186	// Both a and b must not have the most significant bit set
62	static inline uint32_t	187	static inline uint32_t
…		…
84	int32_t d = b - a;	209	int32_t d = b - a;
85	d &= d >> 31;	210	d &= d >> 31;
86	return b - d;	211	return b - d;
87	}	212	}
88		213
89	// this is much faster than crossfires original algorithm	214	// this is much faster than crossfire's original algorithm
90	// on modern cpus	215	// on modern cpus
91	inline int	216	inline int
92	isqrt (int n)	217	isqrt (int n)
93	{	218	{
94	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;
95	}	234	}
96		235
97	// this is only twice as fast as naive sqrtf (dxdy+dydy)	236	// this is only twice as fast as naive sqrtf (dxdy+dydy)
98	#if 0	237	#if 0
99	// 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.
…		…
113	#else	252	#else
114	return dx_ + dy_ - min (dx_, dy_) * 5 / 8;	253	return dx_ + dy_ - min (dx_, dy_) * 5 / 8;
115	#endif	254	#endif
116	}	255	}
117		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
118	/*	277	/*
119	* absdir(int): Returns a number between 1 and 8, which represent	278	* absdir(int): Returns a number between 1 and 8, which represent
120	* the "absolute" direction of a number (it actually takes care of	279	* the "absolute" direction of a number (it actually takes care of
121	* "overflow" in previous calculations of a direction).	280	* "overflow" in previous calculations of a direction).
122	*/	281	*/
…		…
124	absdir (int d)	283	absdir (int d)
125	{	284	{
126	return ((d - 1) & 7) + 1;	285	return ((d - 1) & 7) + 1;
127	}	286	}
128		287
		288	// avoid ctz name because netbsd or freebsd spams it's namespace with it
		289	#if GCC_VERSION(3,4)
		290	static inline int least_significant_bit (uint32_t x)
		291	{
		292	return __builtin_ctz (x);
		293	}
		294	#else
		295	int least_significant_bit (uint32_t x);
		296	#endif
		297
		298	#define for_all_bits_sparse_32(mask, idxvar) \
		299	for (uint32_t idxvar, mask_ = mask; \
		300	mask_ && ((idxvar = least_significant_bit (mask_)), mask_ &= ~(1 << idxvar), 1);)
		301
		302	extern ssize_t slice_alloc; // statistics
		303
		304	void *salloc_ (int n) throw (std::bad_alloc);
		305	void salloc_ (int n, void src) throw (std::bad_alloc);
		306
		307	// strictly the same as g_slice_alloc, but never returns 0
		308	template<typename T>
		309	inline T salloc (int n = 1) throw (std::bad_alloc) { return (T )salloc_ (n * sizeof (T)); }
		310
		311	// also copies src into the new area, like "memdup"
		312	// if src is 0, clears the memory
		313	template<typename T>
		314	inline T salloc (int n, T src) throw (std::bad_alloc) { return (T )salloc_ (n sizeof (T), (void *)src); }
		315
		316	// clears the memory
		317	template<typename T>
		318	inline T salloc0(int n = 1) throw (std::bad_alloc) { return (T )salloc_ (n * sizeof (T), 0); }
		319
		320	// for symmetry
		321	template<typename T>
		322	inline void sfree (T *ptr, int n = 1) throw ()
		323	{
		324	if (expect_true (ptr))
		325	{
		326	slice_alloc -= n * sizeof (T);
		327	if (DEBUG_POISON) memset (ptr, DEBUG_POISON, n * sizeof (T));
		328	g_slice_free1 (n * sizeof (T), (void *)ptr);
		329	}
		330	}
		331
		332	// nulls the pointer
		333	template<typename T>
		334	inline void sfree0 (T *&ptr, int n = 1) throw ()
		335	{
		336	sfree<T> (ptr, n);
		337	ptr = 0;
		338	}
		339
129	// makes dynamically allocated objects zero-initialised	340	// makes dynamically allocated objects zero-initialised
130	struct zero_initialised	341	struct zero_initialised
131	{	342	{
132	void operator new (size_t s, void p)	343	void operator new (size_t s, void p)
133	{	344	{
…		…
135	return p;	346	return p;
136	}	347	}
137		348
138	void *operator new (size_t s)	349	void *operator new (size_t s)
139	{	350	{
140	return g_slice_alloc0 (s);	351	return salloc0<char> (s);
141	}	352	}
142		353
143	void *operator new[] (size_t s)	354	void *operator new[] (size_t s)
144	{	355	{
145	return g_slice_alloc0 (s);	356	return salloc0<char> (s);
146	}	357	}
147		358
148	void operator delete (void *p, size_t s)	359	void operator delete (void *p, size_t s)
149	{	360	{
150	g_slice_free1 (s, p);	361	sfree ((char *)p, s);
151	}	362	}
152		363
153	void operator delete[] (void *p, size_t s)	364	void operator delete[] (void *p, size_t s)
154	{	365	{
155	g_slice_free1 (s, p);	366	sfree ((char *)p, s);
156	}	367	}
157	};	368	};
158		369
159	void *salloc_ (int n) throw (std::bad_alloc);	370	// makes dynamically allocated objects zero-initialised
160	void salloc_ (int n, void src) throw (std::bad_alloc);	371	struct slice_allocated
161
162	// strictly the same as g_slice_alloc, but never returns 0
163	template<typename T>
164	inline T salloc (int n = 1) throw (std::bad_alloc) { return (T )salloc_ (n * sizeof (T)); }
165
166	// also copies src into the new area, like "memdup"
167	// if src is 0, clears the memory
168	template<typename T>
169	inline T salloc (int n, T src) throw (std::bad_alloc) { return (T )salloc_ (n sizeof (T), (void *)src); }
170
171	// clears the memory
172	template<typename T>
173	inline T salloc0(int n = 1) throw (std::bad_alloc) { return (T )salloc_ (n * sizeof (T), 0); }
174
175	// for symmetry
176	template<typename T>
177	inline void sfree (T *ptr, int n = 1) throw ()
178	{	372	{
179	#ifdef PREFER_MALLOC	373	void operator new (size_t s, void p)
180	free (ptr);	374	{
181	#else	375	return p;
182	g_slice_free1 (n * sizeof (T), (void *)ptr);	376	}
183	#endif	377
184	}	378	void *operator new (size_t s)
		379	{
		380	return salloc<char> (s);
		381	}
		382
		383	void *operator new[] (size_t s)
		384	{
		385	return salloc<char> (s);
		386	}
		387
		388	void operator delete (void *p, size_t s)
		389	{
		390	sfree ((char *)p, s);
		391	}
		392
		393	void operator delete[] (void *p, size_t s)
		394	{
		395	sfree ((char *)p, s);
		396	}
		397	};
185		398
186	// a STL-compatible allocator that uses g_slice	399	// a STL-compatible allocator that uses g_slice
187	// boy, this is verbose	400	// boy, this is verbose
188	template<typename Tp>	401	template<typename Tp>
189	struct slice_allocator	402	struct slice_allocator
…		…
201	{	414	{
202	typedef slice_allocator<U> other;	415	typedef slice_allocator<U> other;
203	};	416	};
204		417
205	slice_allocator () throw () { }	418	slice_allocator () throw () { }
206	slice_allocator (const slice_allocator &o) throw () { }	419	slice_allocator (const slice_allocator &) throw () { }
207	template<typename Tp2>	420	template<typename Tp2>
208	slice_allocator (const slice_allocator<Tp2> &) throw () { }	421	slice_allocator (const slice_allocator<Tp2> &) throw () { }
209		422
210	~slice_allocator () { }	423	~slice_allocator () { }
211		424
…		…
220	void deallocate (pointer p, size_type n)	433	void deallocate (pointer p, size_type n)
221	{	434	{
222	sfree<Tp> (p, n);	435	sfree<Tp> (p, n);
223	}	436	}
224		437
225	size_type max_size ()const throw ()	438	size_type max_size () const throw ()
226	{	439	{
227	return size_t (-1) / sizeof (Tp);	440	return size_t (-1) / sizeof (Tp);
228	}	441	}
229		442
230	void construct (pointer p, const Tp &val)	443	void construct (pointer p, const Tp &val)
…		…
236	{	449	{
237	p->~Tp ();	450	p->~Tp ();
238	}	451	}
239	};	452	};
240		453
241	// P. L'Ecuyer, “Maximally Equidistributed Combined Tausworthe Generators”, Mathematics of Computation, 65, 213 (1996), 203–213.	454	// basically a memory area, but refcounted
242	// http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme.ps	455	struct refcnt_buf
243	// http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme2.ps
244	struct tausworthe_random_generator
245	{	456	{
246	// generator	457	char *data;
247	uint32_t state [4];
248		458
249	void operator =(const tausworthe_random_generator &src)	459	refcnt_buf (size_t size = 0);
250	{	460	refcnt_buf (void *data, size_t size);
251	state [0] = src.state [0];
252	state [1] = src.state [1];
253	state [2] = src.state [2];
254	state [3] = src.state [3];
255	}
256		461
257	void seed (uint32_t seed);	462	refcnt_buf (const refcnt_buf &src)
258	uint32_t next ();
259
260	// uniform distribution
261	uint32_t operator ()(uint32_t r_max)
262	{	463	{
263	return is_constant (r_max)	464	data = src.data;
264	? this->next () % r_max	465	++_refcnt ();
265	: get_range (r_max);
266	}	466	}
267		467
268	// return a number within (min .. max)	468	~refcnt_buf ();
269	int operator () (int r_min, int r_max)
270	{
271	return is_constant (r_min) && is_constant (r_max)
272	? r_min + (*this) (max (r_max - r_min + 1, 1))
273	: get_range (r_min, r_max);
274	}
275		469
276	double operator ()()	470	refcnt_buf &operator =(const refcnt_buf &src);
		471
		472	operator char *()
277	{	473	{
278	return this->next () / (double)0xFFFFFFFFU;	474	return data;
		475	}
		476
		477	size_t size () const
		478	{
		479	return _size ();
279	}	480	}
280		481
281	protected:	482	protected:
282	uint32_t get_range (uint32_t r_max);	483	enum {
283	int get_range (int r_min, int r_max);	484	overhead = sizeof (unsigned int) * 2
284	};	485	};
285		486
286	typedef tausworthe_random_generator rand_gen;	487	unsigned int &_size () const
		488	{
		489	return ((unsigned int *)data)[-2];
		490	}
287		491
288	extern rand_gen rndm;	492	unsigned int &_refcnt () const
		493	{
		494	return ((unsigned int *)data)[-1];
		495	}
		496
		497	void _alloc (unsigned int size)
		498	{
		499	data = ((char *)salloc<char> (size + overhead)) + overhead;
		500	_size () = size;
		501	_refcnt () = 1;
		502	}
		503
		504	void dec ()
		505	{
		506	if (!--_refcnt ())
		507	sfree<char> (data - overhead, size () + overhead);
		508	}
		509	};
		510
		511	INTERFACE_CLASS (attachable)
		512	struct refcnt_base
		513	{
		514	typedef int refcnt_t;
		515	mutable refcnt_t ACC (RW, refcnt);
		516
		517	MTH void refcnt_inc () const { ++refcnt; }
		518	MTH void refcnt_dec () const { --refcnt; }
		519
		520	refcnt_base () : refcnt (0) { }
		521	};
		522
		523	// to avoid branches with more advanced compilers
		524	extern refcnt_base::refcnt_t refcnt_dummy;
289		525
290	template<class T>	526	template<class T>
291	struct refptr	527	struct refptr
292	{	528	{
		529	// p if not null
		530	refcnt_base::refcnt_t *refcnt_ref () { return p ? &p->refcnt : &refcnt_dummy; }
		531
		532	void refcnt_dec ()
		533	{
		534	if (!is_constant (p))
		535	--*refcnt_ref ();
		536	else if (p)
		537	--p->refcnt;
		538	}
		539
		540	void refcnt_inc ()
		541	{
		542	if (!is_constant (p))
		543	++*refcnt_ref ();
		544	else if (p)
		545	++p->refcnt;
		546	}
		547
293	T *p;	548	T *p;
294		549
295	refptr () : p(0) { }	550	refptr () : p(0) { }
296	refptr (const refptr<T> &p) : p(p.p) { if (p) p->refcnt_inc (); }	551	refptr (const refptr<T> &p) : p(p.p) { refcnt_inc (); }
297	refptr (T *p) : p(p) { if (p) p->refcnt_inc (); }	552	refptr (T *p) : p(p) { refcnt_inc (); }
298	~refptr () { if (p) p->refcnt_dec (); }	553	~refptr () { refcnt_dec (); }
299		554
300	const refptr<T> &operator =(T *o)	555	const refptr<T> &operator =(T *o)
301	{	556	{
		557	// if decrementing ever destroys we need to reverse the order here
302	if (p) p->refcnt_dec ();	558	refcnt_dec ();
303	p = o;	559	p = o;
304	if (p) p->refcnt_inc ();	560	refcnt_inc ();
305
306	return *this;	561	return *this;
307	}	562	}
308		563
309	const refptr<T> &operator =(const refptr<T> o)	564	const refptr<T> &operator =(const refptr<T> &o)
310	{	565	{
311	*this = o.p;	566	*this = o.p;
312	return *this;	567	return *this;
313	}	568	}
314		569
315	T &operator * () const { return *p; }	570	T &operator * () const { return *p; }
316	T *operator ->() const { return p; }	571	T *operator ->() const { return p; }
317		572
318	operator T *() const { return p; }	573	operator T *() const { return p; }
319	};	574	};
320		575
321	typedef refptr<maptile> maptile_ptr;	576	typedef refptr<maptile> maptile_ptr;
322	typedef refptr<object> object_ptr;	577	typedef refptr<object> object_ptr;
323	typedef refptr<archetype> arch_ptr;	578	typedef refptr<archetype> arch_ptr;
324	typedef refptr<client> client_ptr;	579	typedef refptr<client> client_ptr;
325	typedef refptr<player> player_ptr;	580	typedef refptr<player> player_ptr;
		581	typedef refptr<region> region_ptr;
		582
		583	#define STRHSH_NULL 2166136261
		584
		585	static inline uint32_t
		586	strhsh (const char *s)
		587	{
		588	// use FNV-1a hash (http://isthe.com/chongo/tech/comp/fnv/)
		589	// it is about twice as fast as the one-at-a-time one,
		590	// with good distribution.
		591	// FNV-1a is faster on many cpus because the multiplication
		592	// runs concurrently with the looping logic.
		593	// we modify the hash a bit to improve its distribution
		594	uint32_t hash = STRHSH_NULL;
		595
		596	while (*s)
		597	hash = (hash ^ s++) 16777619U;
		598
		599	return hash ^ (hash >> 16);
		600	}
		601
		602	static inline uint32_t
		603	memhsh (const char *s, size_t len)
		604	{
		605	uint32_t hash = STRHSH_NULL;
		606
		607	while (len--)
		608	hash = (hash ^ s++) 16777619U;
		609
		610	return hash;
		611	}
326		612
327	struct str_hash	613	struct str_hash
328	{	614	{
329	std::size_t operator ()(const char *s) const	615	std::size_t operator ()(const char *s) const
330	{	616	{
331	unsigned long hash = 0;
332
333	/* use the one-at-a-time hash function, which supposedly is
334	* better than the djb2-like one used by perl5.005, but
335	* certainly is better then the bug used here before.
336	* see http://burtleburtle.net/bob/hash/doobs.html
337	*/
338	while (*s)
339	{
340	hash += *s++;
341	hash += hash << 10;
342	hash ^= hash >> 6;
343	}
344
345	hash += hash << 3;
346	hash ^= hash >> 11;
347	hash += hash << 15;
348
349	return hash;	617	return strhsh (s);
		618	}
		619
		620	std::size_t operator ()(const shstr &s) const
		621	{
		622	return strhsh (s);
350	}	623	}
351	};	624	};
352		625
353	struct str_equal	626	struct str_equal
354	{	627	{
…		…
356	{	629	{
357	return !strcmp (a, b);	630	return !strcmp (a, b);
358	}	631	}
359	};	632	};
360		633
		634	// Mostly the same as std::vector, but insert/erase can reorder
		635	// the elements, making append(=insert)/remove O(1) instead of O(n).
		636	//
		637	// NOTE: only some forms of erase are available
361	template<class T>	638	template<class T>
362	struct unordered_vector : std::vector<T, slice_allocator<T> >	639	struct unordered_vector : std::vector<T, slice_allocator<T> >
363	{	640	{
364	typedef typename unordered_vector::iterator iterator;	641	typedef typename unordered_vector::iterator iterator;
365		642
…		…
375	{	652	{
376	erase ((unsigned int )(i - this->begin ()));	653	erase ((unsigned int )(i - this->begin ()));
377	}	654	}
378	};	655	};
379		656
380	template<class T, int T::* index>	657	// This container blends advantages of linked lists
		658	// (efficiency) with vectors (random access) by
		659	// by using an unordered vector and storing the vector
		660	// index inside the object.
		661	//
		662	// + memory-efficient on most 64 bit archs
		663	// + O(1) insert/remove
		664	// + free unique (but varying) id for inserted objects
		665	// + cache-friendly iteration
		666	// - only works for pointers to structs
		667	//
		668	// NOTE: only some forms of erase/insert are available
		669	typedef int object_vector_index;
		670
		671	template<class T, object_vector_index T::*indexmember>
381	struct object_vector : std::vector<T , slice_allocator<T > >	672	struct object_vector : std::vector<T , slice_allocator<T > >
382	{	673	{
		674	typedef typename object_vector::iterator iterator;
		675
		676	bool contains (const T *obj) const
		677	{
		678	return obj->*indexmember;
		679	}
		680
		681	iterator find (const T *obj)
		682	{
		683	return obj->*indexmember
		684	? this->begin () + obj->*indexmember - 1
		685	: this->end ();
		686	}
		687
		688	void push_back (T *obj)
		689	{
		690	std::vector<T , slice_allocator<T > >::push_back (obj);
		691	obj->*indexmember = this->size ();
		692	}
		693
383	void insert (T *obj)	694	void insert (T *obj)
384	{	695	{
385	assert (!(obj->*index));
386	push_back (obj);	696	push_back (obj);
387	obj->*index = this->size ();
388	}	697	}
389		698
390	void insert (T &obj)	699	void insert (T &obj)
391	{	700	{
392	insert (&obj);	701	insert (&obj);
393	}	702	}
394		703
395	void erase (T *obj)	704	void erase (T *obj)
396	{	705	{
397	assert (obj->*index);
398	int pos = obj->*index;	706	unsigned int pos = obj->*indexmember;
399	obj->*index = 0;	707	obj->*indexmember = 0;
400		708
401	if (pos < this->size ())	709	if (pos < this->size ())
402	{	710	{
403	(this)[pos - 1] = (this)[this->size () - 1];	711	(this)[pos - 1] = (this)[this->size () - 1];
404	(this)[pos - 1]->index = pos;	712	(this)[pos - 1]->indexmember = pos;
405	}	713	}
406		714
407	this->pop_back ();	715	this->pop_back ();
408	}	716	}
409		717
410	void erase (T &obj)	718	void erase (T &obj)
411	{	719	{
412	errase (&obj);	720	erase (&obj);
413	}	721	}
414	};	722	};
		723
		724	/////////////////////////////////////////////////////////////////////////////
		725
		726	// something like a vector or stack, but without
		727	// out of bounds checking
		728	template<typename T>
		729	struct fixed_stack
		730	{
		731	T *data;
		732	int size;
		733	int max;
		734
		735	fixed_stack ()
		736	: size (0), data (0)
		737	{
		738	}
		739
		740	fixed_stack (int max)
		741	: size (0), max (max)
		742	{
		743	data = salloc<T> (max);
		744	}
		745
		746	void reset (int new_max)
		747	{
		748	sfree (data, max);
		749	size = 0;
		750	max = new_max;
		751	data = salloc<T> (max);
		752	}
		753
		754	void free ()
		755	{
		756	sfree (data, max);
		757	data = 0;
		758	}
		759
		760	~fixed_stack ()
		761	{
		762	sfree (data, max);
		763	}
		764
		765	T &operator[](int idx)
		766	{
		767	return data [idx];
		768	}
		769
		770	void push (T v)
		771	{
		772	data [size++] = v;
		773	}
		774
		775	T &pop ()
		776	{
		777	return data [--size];
		778	}
		779
		780	T remove (int idx)
		781	{
		782	T v = data [idx];
		783
		784	data [idx] = data [--size];
		785
		786	return v;
		787	}
		788	};
		789
		790	/////////////////////////////////////////////////////////////////////////////
415		791
416	// basically does what strncpy should do, but appends "..." to strings exceeding length	792	// basically does what strncpy should do, but appends "..." to strings exceeding length
		793	// returns the number of bytes actually used (including \0)
417	void assign (char dst, const char src, int maxlen);	794	int assign (char dst, const char src, int maxsize);
418		795
419	// type-safe version of assign	796	// type-safe version of assign
420	template<int N>	797	template<int N>
421	inline void assign (char (&dst)[N], const char *src)	798	inline int assign (char (&dst)[N], const char *src)
422	{	799	{
423	assign ((char *)&dst, src, N);	800	return assign ((char *)&dst, src, N);
424	}	801	}
425		802
426	typedef double tstamp;	803	typedef double tstamp;
427		804
428	// return current time as timestampe	805	// return current time as timestamp
429	tstamp now ();	806	tstamp now ();
430		807
431	int similar_direction (int a, int b);	808	int similar_direction (int a, int b);
432		809
		810	// like v?sprintf, but returns a "static" buffer
		811	char vformat (const char format, va_list ap);
		812	char format (const char format, ...) attribute ((format (printf, 1, 2)));
		813
		814	// safety-check player input which will become object->msg
		815	bool msg_is_safe (const char *msg);
		816
		817	/////////////////////////////////////////////////////////////////////////////
		818	// threads, very very thin wrappers around pthreads
		819
		820	struct thread
		821	{
		822	pthread_t id;
		823
		824	void start (void (start_routine)(void ), void arg = 0);
		825
		826	void cancel ()
		827	{
		828	pthread_cancel (id);
		829	}
		830
		831	void *join ()
		832	{
		833	void *ret;
		834
		835	if (pthread_join (id, &ret))
		836	cleanup ("pthread_join failed", 1);
		837
		838	return ret;
		839	}
		840	};
		841
		842	// note that mutexes are not classes
		843	typedef pthread_mutex_t smutex;
		844
		845	#if __linux && defined (PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP)
		846	#define SMUTEX_INITIALISER PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP
		847	#else
		848	#define SMUTEX_INITIALISER PTHREAD_MUTEX_INITIALIZER
433	#endif	849	#endif
434		850
		851	#define SMUTEX(name) smutex name = SMUTEX_INITIALISER
		852	#define SMUTEX_LOCK(name) pthread_mutex_lock (&(name))
		853	#define SMUTEX_UNLOCK(name) pthread_mutex_unlock (&(name))
		854
		855	typedef pthread_cond_t scond;
		856
		857	#define SCOND(name) scond name = PTHREAD_COND_INITIALIZER
		858	#define SCOND_SIGNAL(name) pthread_cond_signal (&(name))
		859	#define SCOND_BROADCAST(name) pthread_cond_broadcast (&(name))
		860	#define SCOND_WAIT(name,mutex) pthread_cond_wait (&(name), &(mutex))
		861
		862	#endif
		863

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Comparing deliantra/server/include/util.h (file contents): Revision 1.37 by root, Thu Feb 15 15:43:36 2007 UTC vs. Revision 1.117 by root, Tue Jan 3 11:23:41 2012 UTC

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Comparing deliantra/server/include/util.h (file contents):
Revision 1.37 by root, Thu Feb 15 15:43:36 2007 UTC vs.
Revision 1.117 by root, Tue Jan 3 11:23:41 2012 UTC