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

Comparing deliantra/server/include/util.h (file contents):
Revision 1.27 by root, Mon Jan 15 00:40:49 2007 UTC vs.
Revision 1.94 by root, Sun Nov 8 16:13:45 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>
		35	#include <cmath>
11	#include <new>	36	#include <new>
12	#include <vector>	37	#include <vector>
13		38
14	#include <glib.h>	39	#include <glib.h>
15		40
16	#include <shstr.h>	41	#include <shstr.h>
17	#include <traits.h>	42	#include <traits.h>
18		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
19	// 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)
20	#define AUTODECL(var,expr) typeof(expr) var = (expr)	58	#define auto(var,expr) decltype(expr) var = (expr)
21		59
22	// very ugly macro that basicaly declares and initialises a variable	60	// very ugly macro that basically declares and initialises a variable
23	// that is in scope for the next statement only	61	// that is in scope for the next statement only
24	// 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
25	// (note: works great for pointers)	63	// (note: works great for pointers)
26	// most ugly macro I ever wrote	64	// most ugly macro I ever wrote
27	#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)
28		66
29	// in range including end	67	// in range including end
30	#define IN_RANGE_INC(val,beg,end) \	68	#define IN_RANGE_INC(val,beg,end) \
31	((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))
32		70
33	// in range excluding end	71	// in range excluding end
34	#define IN_RANGE_EXC(val,beg,end) \	72	#define IN_RANGE_EXC(val,beg,end) \
35	((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))
36		74
		75	void cleanup (const char *cause, bool make_core = false);
		76	void fork_abort (const char *msg);
		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.
		80	template<typename T, typename U> static inline T min (T a, U b) { return (U)a < b ? (U)a : b; }
		81	template<typename T, typename U> static inline T max (T a, U b) { return (U)a > b ? (U)a : b; }
		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); }
		87
		88	template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; }
		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
		191	// this is much faster than crossfire's original algorithm
		192	// on modern cpus
		193	inline int
		194	isqrt (int n)
		195	{
		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;
		211	}
		212
		213	// this is only twice as fast as naive sqrtf (dxdy+dydy)
		214	#if 0
		215	// and has a max. error of 6 in the range -100..+100.
		216	#else
		217	// and has a max. error of 9 in the range -100..+100.
		218	#endif
		219	inline int
		220	idistance (int dx, int dy)
		221	{
		222	unsigned int dx_ = abs (dx);
		223	unsigned int dy_ = abs (dy);
		224
		225	#if 0
		226	return dx_ > dy_
		227	? (dx_ * 61685 + dy_ * 26870) >> 16
		228	: (dy_ * 61685 + dx_ * 26870) >> 16;
		229	#else
		230	return dx_ + dy_ - min (dx_, dy_) * 5 / 8;
		231	#endif
		232	}
		233
		234	/*
		235	* absdir(int): Returns a number between 1 and 8, which represent
		236	* the "absolute" direction of a number (it actually takes care of
		237	* "overflow" in previous calculations of a direction).
		238	*/
		239	inline int
		240	absdir (int d)
		241	{
		242	return ((d - 1) & 7) + 1;
		243	}
		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
37	// makes dynamically allocated objects zero-initialised	284	// makes dynamically allocated objects zero-initialised
38	struct zero_initialised	285	struct zero_initialised
39	{	286	{
40	void operator new (size_t s, void p)	287	void operator new (size_t s, void p)
41	{	288	{
43	return p;	290	return p;
44	}	291	}
45		292
46	void *operator new (size_t s)	293	void *operator new (size_t s)
47	{	294	{
48	return g_slice_alloc0 (s);	295	return salloc0<char> (s);
49	}	296	}
50		297
51	void *operator new[] (size_t s)	298	void *operator new[] (size_t s)
52	{	299	{
53	return g_slice_alloc0 (s);	300	return salloc0<char> (s);
54	}	301	}
55		302
56	void operator delete (void *p, size_t s)	303	void operator delete (void *p, size_t s)
57	{	304	{
58	g_slice_free1 (s, p);	305	sfree ((char *)p, s);
59	}	306	}
60		307
61	void operator delete[] (void *p, size_t s)	308	void operator delete[] (void *p, size_t s)
62	{	309	{
63	g_slice_free1 (s, p);	310	sfree ((char *)p, s);
64	}	311	}
65	};	312	};
66		313
67	void *salloc_ (int n) throw (std::bad_alloc);	314	// makes dynamically allocated objects zero-initialised
68	void salloc_ (int n, void src) throw (std::bad_alloc);	315	struct slice_allocated
69
70	// strictly the same as g_slice_alloc, but never returns 0
71	template<typename T>
72	inline T salloc (int n = 1) throw (std::bad_alloc) { return (T )salloc_ (n * sizeof (T)); }
73
74	// also copies src into the new area, like "memdup"
75	// if src is 0, clears the memory
76	template<typename T>
77	inline T salloc (int n, T src) throw (std::bad_alloc) { return (T )salloc_ (n sizeof (T), (void *)src); }
78
79	// clears the memory
80	template<typename T>
81	inline T salloc0(int n = 1) throw (std::bad_alloc) { return (T )salloc_ (n * sizeof (T), 0); }
82
83	// for symmetry
84	template<typename T>
85	inline void sfree (T *ptr, int n = 1) throw ()
86	{	316	{
87	g_slice_free1 (n * sizeof (T), (void *)ptr);	317	void operator new (size_t s, void p)
88	}	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	};
89		342
90	// a STL-compatible allocator that uses g_slice	343	// a STL-compatible allocator that uses g_slice
91	// boy, this is verbose	344	// boy, this is verbose
92	template<typename Tp>	345	template<typename Tp>
93	struct slice_allocator	346	struct slice_allocator
…		…
105	{	358	{
106	typedef slice_allocator<U> other;	359	typedef slice_allocator<U> other;
107	};	360	};
108		361
109	slice_allocator () throw () { }	362	slice_allocator () throw () { }
110	slice_allocator (const slice_allocator &o) throw () { }	363	slice_allocator (const slice_allocator &) throw () { }
111	template<typename Tp2>	364	template<typename Tp2>
112	slice_allocator (const slice_allocator<Tp2> &) throw () { }	365	slice_allocator (const slice_allocator<Tp2> &) throw () { }
113		366
114	~slice_allocator () { }	367	~slice_allocator () { }
115		368
…		…
124	void deallocate (pointer p, size_type n)	377	void deallocate (pointer p, size_type n)
125	{	378	{
126	sfree<Tp> (p, n);	379	sfree<Tp> (p, n);
127	}	380	}
128		381
129	size_type max_size ()const throw ()	382	size_type max_size () const throw ()
130	{	383	{
131	return size_t (-1) / sizeof (Tp);	384	return size_t (-1) / sizeof (Tp);
132	}	385	}
133		386
134	void construct (pointer p, const Tp &val)	387	void construct (pointer p, const Tp &val)
…		…
139	void destroy (pointer p)	392	void destroy (pointer p)
140	{	393	{
141	p->~Tp ();	394	p->~Tp ();
142	}	395	}
143	};	396	};
		397
		398	// P. L'Ecuyer, “Maximally Equidistributed Combined Tausworthe Generators”, Mathematics of Computation, 65, 213 (1996), 203–213.
		399	// http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme.ps
		400	// http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme2.ps
		401	struct tausworthe_random_generator
		402	{
		403	uint32_t state [4];
		404
		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);
		414	uint32_t next ();
		415	};
		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)
		451	uint32_t operator ()(uint32_t num)
		452	{
		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
		456	}
		457
		458	// return a number within (min .. max)
		459	int operator () (int r_min, int r_max)
		460	{
		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);
		464	}
		465
		466	double operator ()()
		467	{
		468	return this->next () / (double)0xFFFFFFFFU;
		469	}
		470
		471	protected:
		472	uint32_t get_range (uint32_t r_max);
		473	int get_range (int r_min, int r_max);
		474	};
		475
		476	typedef random_number_generator<tausworthe_random_generator> rand_gen;
		477
		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;
144		494
145	template<class T>	495	template<class T>
146	struct refptr	496	struct refptr
147	{	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
148	T *p;	517	T *p;
149		518
150	refptr () : p(0) { }	519	refptr () : p(0) { }
151	refptr (const refptr<T> &p) : p(p.p) { if (p) p->refcnt_inc (); }	520	refptr (const refptr<T> &p) : p(p.p) { refcnt_inc (); }
152	refptr (T *p) : p(p) { if (p) p->refcnt_inc (); }	521	refptr (T *p) : p(p) { refcnt_inc (); }
153	~refptr () { if (p) p->refcnt_dec (); }	522	~refptr () { refcnt_dec (); }
154		523
155	const refptr<T> &operator =(T *o)	524	const refptr<T> &operator =(T *o)
156	{	525	{
		526	// if decrementing ever destroys we need to reverse the order here
157	if (p) p->refcnt_dec ();	527	refcnt_dec ();
158	p = o;	528	p = o;
159	if (p) p->refcnt_inc ();	529	refcnt_inc ();
160
161	return *this;	530	return *this;
162	}	531	}
163		532
164	const refptr<T> &operator =(const refptr<T> o)	533	const refptr<T> &operator =(const refptr<T> &o)
165	{	534	{
166	*this = o.p;	535	*this = o.p;
167	return *this;	536	return *this;
168	}	537	}
169		538
170	T &operator * () const { return *p; }	539	T &operator * () const { return *p; }
171	T *operator ->() const { return p; }	540	T *operator ->() const { return p; }
172		541
173	operator T *() const { return p; }	542	operator T *() const { return p; }
174	};	543	};
175		544
176	typedef refptr<maptile> maptile_ptr;	545	typedef refptr<maptile> maptile_ptr;
…		…
181		550
182	struct str_hash	551	struct str_hash
183	{	552	{
184	std::size_t operator ()(const char *s) const	553	std::size_t operator ()(const char *s) const
185	{	554	{
186	unsigned long hash = 0;	555	#if 0
		556	uint32_t hash = 0;
187		557
188	/* use the one-at-a-time hash function, which supposedly is	558	/* use the one-at-a-time hash function, which supposedly is
189	* better than the djb2-like one used by perl5.005, but	559	* better than the djb2-like one used by perl5.005, but
190	* certainly is better then the bug used here before.	560	* certainly is better then the bug used here before.
191	* see http://burtleburtle.net/bob/hash/doobs.html	561	* see http://burtleburtle.net/bob/hash/doobs.html
…		…
198	}	568	}
199		569
200	hash += hash << 3;	570	hash += hash << 3;
201	hash ^= hash >> 11;	571	hash ^= hash >> 11;
202	hash += hash << 15;	572	hash += hash << 15;
		573	#else
		574	// use FNV-1a hash (http://isthe.com/chongo/tech/comp/fnv/)
		575	// it is about twice as fast as the one-at-a-time one,
		576	// with good distribution.
		577	// FNV-1a is faster on many cpus because the multiplication
		578	// runs concurrent with the looping logic.
		579	uint32_t hash = 2166136261;
		580
		581	while (*s)
		582	hash = (hash ^ s++) 16777619;
		583	#endif
203		584
204	return hash;	585	return hash;
205	}	586	}
206	};	587	};
207		588
…		…
211	{	592	{
212	return !strcmp (a, b);	593	return !strcmp (a, b);
213	}	594	}
214	};	595	};
215		596
		597	// Mostly the same as std::vector, but insert/erase can reorder
		598	// the elements, making append(=insert)/remove O(1) instead of O(n).
		599	//
		600	// NOTE: only some forms of erase are available
216	template<class T>	601	template<class T>
217	struct unordered_vector : std::vector<T, slice_allocator<T> >	602	struct unordered_vector : std::vector<T, slice_allocator<T> >
218	{	603	{
219	typedef typename unordered_vector::iterator iterator;	604	typedef typename unordered_vector::iterator iterator;
220		605
…		…
230	{	615	{
231	erase ((unsigned int )(i - this->begin ()));	616	erase ((unsigned int )(i - this->begin ()));
232	}	617	}
233	};	618	};
234		619
235	template<class T, int T::* index>	620	// This container blends advantages of linked lists
		621	// (efficiency) with vectors (random access) by
		622	// by using an unordered vector and storing the vector
		623	// index inside the object.
		624	//
		625	// + memory-efficient on most 64 bit archs
		626	// + O(1) insert/remove
		627	// + free unique (but varying) id for inserted objects
		628	// + cache-friendly iteration
		629	// - only works for pointers to structs
		630	//
		631	// NOTE: only some forms of erase/insert are available
		632	typedef int object_vector_index;
		633
		634	template<class T, object_vector_index T::*indexmember>
236	struct object_vector : std::vector<T , slice_allocator<T > >	635	struct object_vector : std::vector<T , slice_allocator<T > >
237	{	636	{
		637	typedef typename object_vector::iterator iterator;
		638
		639	bool contains (const T *obj) const
		640	{
		641	return obj->*indexmember;
		642	}
		643
		644	iterator find (const T *obj)
		645	{
		646	return obj->*indexmember
		647	? this->begin () + obj->*indexmember - 1
		648	: this->end ();
		649	}
		650
		651	void push_back (T *obj)
		652	{
		653	std::vector<T , slice_allocator<T > >::push_back (obj);
		654	obj->*indexmember = this->size ();
		655	}
		656
238	void insert (T *obj)	657	void insert (T *obj)
239	{	658	{
240	assert (!(obj->*index));
241	push_back (obj);	659	push_back (obj);
242	obj->*index = this->size ();
243	}	660	}
244		661
245	void insert (T &obj)	662	void insert (T &obj)
246	{	663	{
247	insert (&obj);	664	insert (&obj);
248	}	665	}
249		666
250	void erase (T *obj)	667	void erase (T *obj)
251	{	668	{
252	assert (obj->*index);
253	int pos = obj->*index;	669	unsigned int pos = obj->*indexmember;
254	obj->*index = 0;	670	obj->*indexmember = 0;
255		671
256	if (pos < this->size ())	672	if (pos < this->size ())
257	{	673	{
258	(this)[pos - 1] = (this)[this->size () - 1];	674	(this)[pos - 1] = (this)[this->size () - 1];
259	(this)[pos - 1]->index = pos;	675	(this)[pos - 1]->indexmember = pos;
260	}	676	}
261		677
262	this->pop_back ();	678	this->pop_back ();
263	}	679	}
264		680
265	void erase (T &obj)	681	void erase (T &obj)
266	{	682	{
267	errase (&obj);	683	erase (&obj);
268	}	684	}
269	};	685	};
270
271	template<typename T, typename U> static inline T min (T a, U b) { return a < (T)b ? a : (T)b; }
272	template<typename T, typename U> static inline T max (T a, U b) { return a > (T)b ? a : (T)b; }
273	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; }
274
275	template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; }
276		686
277	// basically does what strncpy should do, but appends "..." to strings exceeding length	687	// basically does what strncpy should do, but appends "..." to strings exceeding length
		688	// returns the number of bytes actually used (including \0)
278	void assign (char dst, const char src, int maxlen);	689	int assign (char dst, const char src, int maxsize);
279		690
280	// type-safe version of assign	691	// type-safe version of assign
281	template<int N>	692	template<int N>
282	inline void assign (char (&dst)[N], const char *src)	693	inline int assign (char (&dst)[N], const char *src)
283	{	694	{
284	assign ((char *)&dst, src, N);	695	return assign ((char *)&dst, src, N);
285	}	696	}
286		697
287	typedef double tstamp;	698	typedef double tstamp;
288		699
289	// return current time as timestampe	700	// return current time as timestamp
290	tstamp now ();	701	tstamp now ();
291		702
292	int similar_direction (int a, int b);	703	int similar_direction (int a, int b);
293		704
		705	// like v?sprintf, but returns a "static" buffer
		706	char vformat (const char format, va_list ap);
		707	char format (const char format, ...) attribute ((format (printf, 1, 2)));
		708
		709	// safety-check player input which will become object->msg
		710	bool msg_is_safe (const char *msg);
		711
		712	/////////////////////////////////////////////////////////////////////////////
		713	// threads, very very thin wrappers around pthreads
		714
		715	struct thread
		716	{
		717	pthread_t id;
		718
		719	void start (void (start_routine)(void ), void arg = 0);
		720
		721	void cancel ()
		722	{
		723	pthread_cancel (id);
		724	}
		725
		726	void *join ()
		727	{
		728	void *ret;
		729
		730	if (pthread_join (id, &ret))
		731	cleanup ("pthread_join failed", 1);
		732
		733	return ret;
		734	}
		735	};
		736
		737	// note that mutexes are not classes
		738	typedef pthread_mutex_t smutex;
		739
		740	#if __linux && defined (PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP)
		741	#define SMUTEX_INITIALISER PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP
		742	#else
		743	#define SMUTEX_INITIALISER PTHREAD_MUTEX_INITIALIZER
294	#endif	744	#endif
295		745
		746	#define SMUTEX(name) smutex name = SMUTEX_INITIALISER
		747	#define SMUTEX_LOCK(name) pthread_mutex_lock (&(name))
		748	#define SMUTEX_UNLOCK(name) pthread_mutex_unlock (&(name))
		749
		750	typedef pthread_cond_t scond;
		751
		752	#define SCOND(name) scond name = PTHREAD_COND_INITIALIZER
		753	#define SCOND_SIGNAL(name) pthread_cond_signal (&(name))
		754	#define SCOND_BROADCAST(name) pthread_cond_broadcast (&(name))
		755	#define SCOND_WAIT(name,mutex) pthread_cond_wait (&(name), &(mutex))
		756
		757	#endif
		758

Diff Legend

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

Comparing deliantra/server/include/util.h (file contents): Revision 1.27 by root, Mon Jan 15 00:40:49 2007 UTC vs. Revision 1.94 by root, Sun Nov 8 16:13:45 2009 UTC

Diff Legend

Comparing deliantra/server/include/util.h (file contents):
Revision 1.27 by root, Mon Jan 15 00:40:49 2007 UTC vs.
Revision 1.94 by root, Sun Nov 8 16:13:45 2009 UTC