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

Comparing deliantra/server/include/util.h (file contents):
Revision 1.30 by root, Mon Jan 15 01:50:33 2007 UTC vs.
Revision 1.103 by root, Thu Apr 29 15:49:04 2010 UTC

…		…
		1	/*
		2	* This file is part of Deliantra, the Roguelike Realtime MMORPG.
		3	*
		4	* Copyright (©) 2005,2006,2007,2008,2009,2010 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
		60	// could use the sizeof (arr) /( sizeof (arr [0]) here, but C++ is
		61	// much more obfuscated... :)
		62
		63	template<typename T, int N>
		64	inline int array_length (const T (&arr)[N])
		65	{
		66	return N;
		67	}
		68
23	// very ugly macro that basicaly declares and initialises a variable	69	// very ugly macro that basically declares and initialises a variable
24	// that is in scope for the next statement only	70	// that is in scope for the next statement only
25	// works only for stuff that can be assigned 0 and converts to false	71	// works only for stuff that can be assigned 0 and converts to false
26	// (note: works great for pointers)	72	// (note: works great for pointers)
27	// most ugly macro I ever wrote	73	// most ugly macro I ever wrote
28	#define declvar(type, name, value) if (type name = 0) { } else if (((name) = (value)), 1)	74	#define statementvar(type, name, value) if (type name = 0) { } else if (((name) = (value)), 1)
29		75
30	// in range including end	76	// in range including end
31	#define IN_RANGE_INC(val,beg,end) \	77	#define IN_RANGE_INC(val,beg,end) \
32	((unsigned int)(val) - (unsigned int)(beg) <= (unsigned int)(end) - (unsigned int)(beg))	78	((unsigned int)(val) - (unsigned int)(beg) <= (unsigned int)(end) - (unsigned int)(beg))
33		79
34	// in range excluding end	80	// in range excluding end
35	#define IN_RANGE_EXC(val,beg,end) \	81	#define IN_RANGE_EXC(val,beg,end) \
36	((unsigned int)(val) - (unsigned int)(beg) < (unsigned int)(end) - (unsigned int)(beg))	82	((unsigned int)(val) - (unsigned int)(beg) < (unsigned int)(end) - (unsigned int)(beg))
37		83
		84	void cleanup (const char *cause, bool make_core = false);
		85	void fork_abort (const char *msg);
		86
		87	// rationale for using (U) not (T) is to reduce signed/unsigned issues,
		88	// as a is often a constant while b is the variable. it is still a bug, though.
		89	template<typename T, typename U> static inline T min (T a, U b) { return (U)a < b ? (U)a : b; }
		90	template<typename T, typename U> static inline T max (T a, U b) { return (U)a > b ? (U)a : b; }
		91	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; }
		92
		93	template<typename T, typename U> static inline void min_it (T &v, U m) { v = min (v, (T)m); }
		94	template<typename T, typename U> static inline void max_it (T &v, U m) { v = max (v, (T)m); }
		95	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); }
		96
		97	template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; }
		98
		99	template<typename T, typename U, typename V> static inline T min (T a, U b, V c) { return min (a, min (b, c)); }
		100	template<typename T, typename U, typename V> static inline T max (T a, U b, V c) { return max (a, max (b, c)); }
		101
		102	// sign returns -1 or +1
		103	template<typename T>
		104	static inline T sign (T v) { return v < 0 ? -1 : +1; }
		105	// relies on 2c representation
		106	template<>
		107	inline sint8 sign (sint8 v) { return 1 - (sint8 (uint8 (v) >> 7) * 2); }
		108	template<>
		109	inline sint16 sign (sint16 v) { return 1 - (sint16 (uint16 (v) >> 15) * 2); }
		110	template<>
		111	inline sint32 sign (sint32 v) { return 1 - (sint32 (uint32 (v) >> 31) * 2); }
		112
		113	// sign0 returns -1, 0 or +1
		114	template<typename T>
		115	static inline T sign0 (T v) { return v ? sign (v) : 0; }
		116
		117	template<typename T, typename U>
		118	static inline T copysign (T a, U b) { return a > 0 ? b : -b; }
		119
		120	// div* only work correctly for div > 0
		121	// div, with correct rounding (< 0.5 downwards, >=0.5 upwards)
		122	template<typename T> static inline T div (T val, T div)
		123	{
		124	return expect_false (val < 0) ? - ((-val + (div - 1) / 2) / div) : (val + div / 2) / div;
		125	}
		126	// div, round-up
		127	template<typename T> static inline T div_ru (T val, T div)
		128	{
		129	return expect_false (val < 0) ? - ((-val ) / div) : (val + div - 1) / div;
		130	}
		131	// div, round-down
		132	template<typename T> static inline T div_rd (T val, T div)
		133	{
		134	return expect_false (val < 0) ? - ((-val + (div - 1) ) / div) : (val ) / div;
		135	}
		136
		137	// lerp* only work correctly for min_in < max_in
		138	// Linear intERPolate, scales val from min_in..max_in to min_out..max_out
		139	template<typename T>
		140	static inline T
		141	lerp (T val, T min_in, T max_in, T min_out, T max_out)
		142	{
		143	return min_out + div <T> ((val - min_in) * (max_out - min_out), max_in - min_in);
		144	}
		145
		146	// lerp, round-down
		147	template<typename T>
		148	static inline T
		149	lerp_rd (T val, T min_in, T max_in, T min_out, T max_out)
		150	{
		151	return min_out + div_rd<T> ((val - min_in) * (max_out - min_out), max_in - min_in);
		152	}
		153
		154	// lerp, round-up
		155	template<typename T>
		156	static inline T
		157	lerp_ru (T val, T min_in, T max_in, T min_out, T max_out)
		158	{
		159	return min_out + div_ru<T> ((val - min_in) * (max_out - min_out), max_in - min_in);
		160	}
		161
		162	// lots of stuff taken from FXT
		163
		164	/* Rotate right. This is used in various places for checksumming */
		165	//TODO: that sucks, use a better checksum algo
		166	static inline uint32_t
		167	rotate_right (uint32_t c, uint32_t count = 1)
		168	{
		169	return (c << (32 - count)) \| (c >> count);
		170	}
		171
		172	static inline uint32_t
		173	rotate_left (uint32_t c, uint32_t count = 1)
		174	{
		175	return (c >> (32 - count)) \| (c << count);
		176	}
		177
		178	// Return abs(a-b)
		179	// Both a and b must not have the most significant bit set
		180	static inline uint32_t
		181	upos_abs_diff (uint32_t a, uint32_t b)
		182	{
		183	long d1 = b - a;
		184	long d2 = (d1 & (d1 >> 31)) << 1;
		185
		186	return d1 - d2; // == (b - d) - (a + d);
		187	}
		188
		189	// Both a and b must not have the most significant bit set
		190	static inline uint32_t
		191	upos_min (uint32_t a, uint32_t b)
		192	{
		193	int32_t d = b - a;
		194	d &= d >> 31;
		195	return a + d;
		196	}
		197
		198	// Both a and b must not have the most significant bit set
		199	static inline uint32_t
		200	upos_max (uint32_t a, uint32_t b)
		201	{
		202	int32_t d = b - a;
		203	d &= d >> 31;
		204	return b - d;
		205	}
		206
38	// this is much faster than crossfires original algorithm	207	// this is much faster than crossfire's original algorithm
39	// on modern cpus	208	// on modern cpus
40	inline int	209	inline int
41	isqrt (int n)	210	isqrt (int n)
42	{	211	{
43	return (int)sqrtf ((float)n);	212	return (int)sqrtf ((float)n);
		213	}
		214
		215	// this is kind of like the ^^ operator, if it would exist, without sequence point.
		216	// more handy than it looks like, due to the implicit !! done on its arguments
		217	inline bool
		218	logical_xor (bool a, bool b)
		219	{
		220	return a != b;
		221	}
		222
		223	inline bool
		224	logical_implies (bool a, bool b)
		225	{
		226	return a <= b;
44	}	227	}
45		228
46	// this is only twice as fast as naive sqrtf (dxdy+dydy)	229	// this is only twice as fast as naive sqrtf (dxdy+dydy)
47	#if 0	230	#if 0
48	// and has a max. error of 6 in the range -100..+100.	231	// and has a max. error of 6 in the range -100..+100.
…		…
73	absdir (int d)	256	absdir (int d)
74	{	257	{
75	return ((d - 1) & 7) + 1;	258	return ((d - 1) & 7) + 1;
76	}	259	}
77		260
		261	// avoid ctz name because netbsd or freebsd spams it's namespace with it
		262	#if GCC_VERSION(3,4)
		263	static inline int least_significant_bit (uint32_t x)
		264	{
		265	return __builtin_ctz (x);
		266	}
		267	#else
		268	int least_significant_bit (uint32_t x);
		269	#endif
		270
		271	#define for_all_bits_sparse_32(mask, idxvar) \
		272	for (uint32_t idxvar, mask_ = mask; \
		273	mask_ && ((idxvar = least_significant_bit (mask_)), mask_ &= ~(1 << idxvar), 1);)
		274
		275	extern ssize_t slice_alloc; // statistics
		276
		277	void *salloc_ (int n) throw (std::bad_alloc);
		278	void salloc_ (int n, void src) throw (std::bad_alloc);
		279
		280	// strictly the same as g_slice_alloc, but never returns 0
		281	template<typename T>
		282	inline T salloc (int n = 1) throw (std::bad_alloc) { return (T )salloc_ (n * sizeof (T)); }
		283
		284	// also copies src into the new area, like "memdup"
		285	// if src is 0, clears the memory
		286	template<typename T>
		287	inline T salloc (int n, T src) throw (std::bad_alloc) { return (T )salloc_ (n sizeof (T), (void *)src); }
		288
		289	// clears the memory
		290	template<typename T>
		291	inline T salloc0(int n = 1) throw (std::bad_alloc) { return (T )salloc_ (n * sizeof (T), 0); }
		292
		293	// for symmetry
		294	template<typename T>
		295	inline void sfree (T *ptr, int n = 1) throw ()
		296	{
		297	if (expect_true (ptr))
		298	{
		299	slice_alloc -= n * sizeof (T);
		300	if (DEBUG_POISON) memset (ptr, DEBUG_POISON, n * sizeof (T));
		301	g_slice_free1 (n * sizeof (T), (void *)ptr);
		302	assert (slice_alloc >= 0);//D
		303	}
		304	}
		305
		306	// nulls the pointer
		307	template<typename T>
		308	inline void sfree0 (T *&ptr, int n = 1) throw ()
		309	{
		310	sfree<T> (ptr, n);
		311	ptr = 0;
		312	}
		313
78	// makes dynamically allocated objects zero-initialised	314	// makes dynamically allocated objects zero-initialised
79	struct zero_initialised	315	struct zero_initialised
80	{	316	{
81	void operator new (size_t s, void p)	317	void operator new (size_t s, void p)
82	{	318	{
…		…
84	return p;	320	return p;
85	}	321	}
86		322
87	void *operator new (size_t s)	323	void *operator new (size_t s)
88	{	324	{
89	return g_slice_alloc0 (s);	325	return salloc0<char> (s);
90	}	326	}
91		327
92	void *operator new[] (size_t s)	328	void *operator new[] (size_t s)
93	{	329	{
94	return g_slice_alloc0 (s);	330	return salloc0<char> (s);
95	}	331	}
96		332
97	void operator delete (void *p, size_t s)	333	void operator delete (void *p, size_t s)
98	{	334	{
99	g_slice_free1 (s, p);	335	sfree ((char *)p, s);
100	}	336	}
101		337
102	void operator delete[] (void *p, size_t s)	338	void operator delete[] (void *p, size_t s)
103	{	339	{
104	g_slice_free1 (s, p);	340	sfree ((char *)p, s);
105	}	341	}
106	};	342	};
107		343
108	void *salloc_ (int n) throw (std::bad_alloc);	344	// makes dynamically allocated objects zero-initialised
109	void salloc_ (int n, void src) throw (std::bad_alloc);	345	struct slice_allocated
110
111	// strictly the same as g_slice_alloc, but never returns 0
112	template<typename T>
113	inline T salloc (int n = 1) throw (std::bad_alloc) { return (T )salloc_ (n * sizeof (T)); }
114
115	// also copies src into the new area, like "memdup"
116	// if src is 0, clears the memory
117	template<typename T>
118	inline T salloc (int n, T src) throw (std::bad_alloc) { return (T )salloc_ (n sizeof (T), (void *)src); }
119
120	// clears the memory
121	template<typename T>
122	inline T salloc0(int n = 1) throw (std::bad_alloc) { return (T )salloc_ (n * sizeof (T), 0); }
123
124	// for symmetry
125	template<typename T>
126	inline void sfree (T *ptr, int n = 1) throw ()
127	{	346	{
128	g_slice_free1 (n * sizeof (T), (void *)ptr);	347	void operator new (size_t s, void p)
129	}	348	{
		349	return p;
		350	}
		351
		352	void *operator new (size_t s)
		353	{
		354	return salloc<char> (s);
		355	}
		356
		357	void *operator new[] (size_t s)
		358	{
		359	return salloc<char> (s);
		360	}
		361
		362	void operator delete (void *p, size_t s)
		363	{
		364	sfree ((char *)p, s);
		365	}
		366
		367	void operator delete[] (void *p, size_t s)
		368	{
		369	sfree ((char *)p, s);
		370	}
		371	};
130		372
131	// a STL-compatible allocator that uses g_slice	373	// a STL-compatible allocator that uses g_slice
132	// boy, this is verbose	374	// boy, this is verbose
133	template<typename Tp>	375	template<typename Tp>
134	struct slice_allocator	376	struct slice_allocator
…		…
146	{	388	{
147	typedef slice_allocator<U> other;	389	typedef slice_allocator<U> other;
148	};	390	};
149		391
150	slice_allocator () throw () { }	392	slice_allocator () throw () { }
151	slice_allocator (const slice_allocator &o) throw () { }	393	slice_allocator (const slice_allocator &) throw () { }
152	template<typename Tp2>	394	template<typename Tp2>
153	slice_allocator (const slice_allocator<Tp2> &) throw () { }	395	slice_allocator (const slice_allocator<Tp2> &) throw () { }
154		396
155	~slice_allocator () { }	397	~slice_allocator () { }
156		398
…		…
165	void deallocate (pointer p, size_type n)	407	void deallocate (pointer p, size_type n)
166	{	408	{
167	sfree<Tp> (p, n);	409	sfree<Tp> (p, n);
168	}	410	}
169		411
170	size_type max_size ()const throw ()	412	size_type max_size () const throw ()
171	{	413	{
172	return size_t (-1) / sizeof (Tp);	414	return size_t (-1) / sizeof (Tp);
173	}	415	}
174		416
175	void construct (pointer p, const Tp &val)	417	void construct (pointer p, const Tp &val)
…		…
180	void destroy (pointer p)	422	void destroy (pointer p)
181	{	423	{
182	p->~Tp ();	424	p->~Tp ();
183	}	425	}
184	};	426	};
		427
		428	// P. L'Ecuyer, “Maximally Equidistributed Combined Tausworthe Generators”, Mathematics of Computation, 65, 213 (1996), 203–213.
		429	// http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme.ps
		430	// http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme2.ps
		431	struct tausworthe_random_generator
		432	{
		433	uint32_t state [4];
		434
		435	void operator =(const tausworthe_random_generator &src)
		436	{
		437	state [0] = src.state [0];
		438	state [1] = src.state [1];
		439	state [2] = src.state [2];
		440	state [3] = src.state [3];
		441	}
		442
		443	void seed (uint32_t seed);
		444	uint32_t next ();
		445	};
		446
		447	// Xorshift RNGs, George Marsaglia
		448	// http://www.jstatsoft.org/v08/i14/paper
		449	// this one is about 40% faster than the tausworthe one above (i.e. not much),
		450	// despite the inlining, and has the issue of only creating 2**32-1 numbers.
		451	// see also http://www.iro.umontreal.ca/~lecuyer/myftp/papers/xorshift.pdf
		452	struct xorshift_random_generator
		453	{
		454	uint32_t x, y;
		455
		456	void operator =(const xorshift_random_generator &src)
		457	{
		458	x = src.x;
		459	y = src.y;
		460	}
		461
		462	void seed (uint32_t seed)
		463	{
		464	x = seed;
		465	y = seed * 69069U;
		466	}
		467
		468	uint32_t next ()
		469	{
		470	uint32_t t = x ^ (x << 10);
		471	x = y;
		472	y = y ^ (y >> 13) ^ t ^ (t >> 10);
		473	return y;
		474	}
		475	};
		476
		477	template<class generator>
		478	struct random_number_generator : generator
		479	{
		480	// uniform distribution, 0 .. max (0, num - 1)
		481	uint32_t operator ()(uint32_t num)
		482	{
		483	return !is_constant (num) ? get_range (num) // non-constant
		484	: num & (num - 1) ? (this->next () * (uint64_t)num) >> 32U // constant, non-power-of-two
		485	: this->next () & (num - 1); // constant, power-of-two
		486	}
		487
		488	// return a number within the closed interval [min .. max]
		489	int operator () (int r_min, int r_max)
		490	{
		491	return is_constant (r_min) && is_constant (r_max) && r_min <= r_max
		492	? r_min + operator ()(r_max - r_min + 1)
		493	: get_range (r_min, r_max);
		494	}
		495
		496	// return a number within the closed interval [0..1]
		497	double operator ()()
		498	{
		499	return this->next () / (double)0xFFFFFFFFU;
		500	}
		501
		502	protected:
		503	uint32_t get_range (uint32_t r_max);
		504	int get_range (int r_min, int r_max);
		505	};
		506
		507	typedef random_number_generator<tausworthe_random_generator> rand_gen;
		508
		509	extern rand_gen rndm, rmg_rndm;
		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;
185		525
186	template<class T>	526	template<class T>
187	struct refptr	527	struct refptr
188	{	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
189	T *p;	548	T *p;
190		549
191	refptr () : p(0) { }	550	refptr () : p(0) { }
192	refptr (const refptr<T> &p) : p(p.p) { if (p) p->refcnt_inc (); }	551	refptr (const refptr<T> &p) : p(p.p) { refcnt_inc (); }
193	refptr (T *p) : p(p) { if (p) p->refcnt_inc (); }	552	refptr (T *p) : p(p) { refcnt_inc (); }
194	~refptr () { if (p) p->refcnt_dec (); }	553	~refptr () { refcnt_dec (); }
195		554
196	const refptr<T> &operator =(T *o)	555	const refptr<T> &operator =(T *o)
197	{	556	{
		557	// if decrementing ever destroys we need to reverse the order here
198	if (p) p->refcnt_dec ();	558	refcnt_dec ();
199	p = o;	559	p = o;
200	if (p) p->refcnt_inc ();	560	refcnt_inc ();
201
202	return *this;	561	return *this;
203	}	562	}
204		563
205	const refptr<T> &operator =(const refptr<T> o)	564	const refptr<T> &operator =(const refptr<T> &o)
206	{	565	{
207	*this = o.p;	566	*this = o.p;
208	return *this;	567	return *this;
209	}	568	}
210		569
211	T &operator * () const { return *p; }	570	T &operator * () const { return *p; }
212	T *operator ->() const { return p; }	571	T *operator ->() const { return p; }
213		572
214	operator T *() const { return p; }	573	operator T *() const { return p; }
215	};	574	};
216		575
217	typedef refptr<maptile> maptile_ptr;	576	typedef refptr<maptile> maptile_ptr;
218	typedef refptr<object> object_ptr;	577	typedef refptr<object> object_ptr;
219	typedef refptr<archetype> arch_ptr;	578	typedef refptr<archetype> arch_ptr;
220	typedef refptr<client> client_ptr;	579	typedef refptr<client> client_ptr;
221	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	uint32_t hash = STRHSH_NULL;
		594
		595	while (*s)
		596	hash = (hash ^ s++) 16777619U;
		597
		598	return hash;
		599	}
		600
		601	static inline uint32_t
		602	memhsh (const char *s, size_t len)
		603	{
		604	uint32_t hash = STRHSH_NULL;
		605
		606	while (len--)
		607	hash = (hash ^ s++) 16777619U;
		608
		609	return hash;
		610	}
222		611
223	struct str_hash	612	struct str_hash
224	{	613	{
225	std::size_t operator ()(const char *s) const	614	std::size_t operator ()(const char *s) const
226	{	615	{
227	unsigned long hash = 0;
228
229	/* use the one-at-a-time hash function, which supposedly is
230	* better than the djb2-like one used by perl5.005, but
231	* certainly is better then the bug used here before.
232	* see http://burtleburtle.net/bob/hash/doobs.html
233	*/
234	while (*s)
235	{
236	hash += *s++;
237	hash += hash << 10;
238	hash ^= hash >> 6;
239	}
240
241	hash += hash << 3;
242	hash ^= hash >> 11;
243	hash += hash << 15;
244
245	return hash;	616	return strhsh (s);
		617	}
		618
		619	std::size_t operator ()(const shstr &s) const
		620	{
		621	return strhsh (s);
246	}	622	}
247	};	623	};
248		624
249	struct str_equal	625	struct str_equal
250	{	626	{
…		…
252	{	628	{
253	return !strcmp (a, b);	629	return !strcmp (a, b);
254	}	630	}
255	};	631	};
256		632
		633	// Mostly the same as std::vector, but insert/erase can reorder
		634	// the elements, making append(=insert)/remove O(1) instead of O(n).
		635	//
		636	// NOTE: only some forms of erase are available
257	template<class T>	637	template<class T>
258	struct unordered_vector : std::vector<T, slice_allocator<T> >	638	struct unordered_vector : std::vector<T, slice_allocator<T> >
259	{	639	{
260	typedef typename unordered_vector::iterator iterator;	640	typedef typename unordered_vector::iterator iterator;
261		641
…		…
271	{	651	{
272	erase ((unsigned int )(i - this->begin ()));	652	erase ((unsigned int )(i - this->begin ()));
273	}	653	}
274	};	654	};
275		655
276	template<class T, int T::* index>	656	// This container blends advantages of linked lists
		657	// (efficiency) with vectors (random access) by
		658	// by using an unordered vector and storing the vector
		659	// index inside the object.
		660	//
		661	// + memory-efficient on most 64 bit archs
		662	// + O(1) insert/remove
		663	// + free unique (but varying) id for inserted objects
		664	// + cache-friendly iteration
		665	// - only works for pointers to structs
		666	//
		667	// NOTE: only some forms of erase/insert are available
		668	typedef int object_vector_index;
		669
		670	template<class T, object_vector_index T::*indexmember>
277	struct object_vector : std::vector<T , slice_allocator<T > >	671	struct object_vector : std::vector<T , slice_allocator<T > >
278	{	672	{
		673	typedef typename object_vector::iterator iterator;
		674
		675	bool contains (const T *obj) const
		676	{
		677	return obj->*indexmember;
		678	}
		679
		680	iterator find (const T *obj)
		681	{
		682	return obj->*indexmember
		683	? this->begin () + obj->*indexmember - 1
		684	: this->end ();
		685	}
		686
		687	void push_back (T *obj)
		688	{
		689	std::vector<T , slice_allocator<T > >::push_back (obj);
		690	obj->*indexmember = this->size ();
		691	}
		692
279	void insert (T *obj)	693	void insert (T *obj)
280	{	694	{
281	assert (!(obj->*index));
282	push_back (obj);	695	push_back (obj);
283	obj->*index = this->size ();
284	}	696	}
285		697
286	void insert (T &obj)	698	void insert (T &obj)
287	{	699	{
288	insert (&obj);	700	insert (&obj);
289	}	701	}
290		702
291	void erase (T *obj)	703	void erase (T *obj)
292	{	704	{
293	assert (obj->*index);
294	int pos = obj->*index;	705	unsigned int pos = obj->*indexmember;
295	obj->*index = 0;	706	obj->*indexmember = 0;
296		707
297	if (pos < this->size ())	708	if (pos < this->size ())
298	{	709	{
299	(this)[pos - 1] = (this)[this->size () - 1];	710	(this)[pos - 1] = (this)[this->size () - 1];
300	(this)[pos - 1]->index = pos;	711	(this)[pos - 1]->indexmember = pos;
301	}	712	}
302		713
303	this->pop_back ();	714	this->pop_back ();
304	}	715	}
305		716
306	void erase (T &obj)	717	void erase (T &obj)
307	{	718	{
308	errase (&obj);	719	erase (&obj);
309	}	720	}
310	};	721	};
311
312	template<typename T, typename U> static inline T min (T a, U b) { return a < (T)b ? a : (T)b; }
313	template<typename T, typename U> static inline T max (T a, U b) { return a > (T)b ? a : (T)b; }
314	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; }
315
316	template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; }
317		722
318	// basically does what strncpy should do, but appends "..." to strings exceeding length	723	// basically does what strncpy should do, but appends "..." to strings exceeding length
		724	// returns the number of bytes actually used (including \0)
319	void assign (char dst, const char src, int maxlen);	725	int assign (char dst, const char src, int maxsize);
320		726
321	// type-safe version of assign	727	// type-safe version of assign
322	template<int N>	728	template<int N>
323	inline void assign (char (&dst)[N], const char *src)	729	inline int assign (char (&dst)[N], const char *src)
324	{	730	{
325	assign ((char *)&dst, src, N);	731	return assign ((char *)&dst, src, N);
326	}	732	}
327		733
328	typedef double tstamp;	734	typedef double tstamp;
329		735
330	// return current time as timestampe	736	// return current time as timestamp
331	tstamp now ();	737	tstamp now ();
332		738
333	int similar_direction (int a, int b);	739	int similar_direction (int a, int b);
334		740
		741	// like v?sprintf, but returns a "static" buffer
		742	char vformat (const char format, va_list ap);
		743	char format (const char format, ...) attribute ((format (printf, 1, 2)));
		744
		745	// safety-check player input which will become object->msg
		746	bool msg_is_safe (const char *msg);
		747
		748	/////////////////////////////////////////////////////////////////////////////
		749	// threads, very very thin wrappers around pthreads
		750
		751	struct thread
		752	{
		753	pthread_t id;
		754
		755	void start (void (start_routine)(void ), void arg = 0);
		756
		757	void cancel ()
		758	{
		759	pthread_cancel (id);
		760	}
		761
		762	void *join ()
		763	{
		764	void *ret;
		765
		766	if (pthread_join (id, &ret))
		767	cleanup ("pthread_join failed", 1);
		768
		769	return ret;
		770	}
		771	};
		772
		773	// note that mutexes are not classes
		774	typedef pthread_mutex_t smutex;
		775
		776	#if __linux && defined (PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP)
		777	#define SMUTEX_INITIALISER PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP
		778	#else
		779	#define SMUTEX_INITIALISER PTHREAD_MUTEX_INITIALIZER
335	#endif	780	#endif
336		781
		782	#define SMUTEX(name) smutex name = SMUTEX_INITIALISER
		783	#define SMUTEX_LOCK(name) pthread_mutex_lock (&(name))
		784	#define SMUTEX_UNLOCK(name) pthread_mutex_unlock (&(name))
		785
		786	typedef pthread_cond_t scond;
		787
		788	#define SCOND(name) scond name = PTHREAD_COND_INITIALIZER
		789	#define SCOND_SIGNAL(name) pthread_cond_signal (&(name))
		790	#define SCOND_BROADCAST(name) pthread_cond_broadcast (&(name))
		791	#define SCOND_WAIT(name,mutex) pthread_cond_wait (&(name), &(mutex))
		792
		793	#endif
		794

Diff Legend

-–
+Removed lines
-+
+Added lines
-<
+Changed lines
->
+Changed lines

Comparing deliantra/server/include/util.h (file contents): Revision 1.30 by root, Mon Jan 15 01:50:33 2007 UTC vs. Revision 1.103 by root, Thu Apr 29 15:49:04 2010 UTC

Diff Legend

Comparing deliantra/server/include/util.h (file contents):
Revision 1.30 by root, Mon Jan 15 01:50:33 2007 UTC vs.
Revision 1.103 by root, Thu Apr 29 15:49:04 2010 UTC