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

Comparing deliantra/server/include/util.h (file contents):
Revision 1.41 by root, Sat Apr 21 22:57:16 2007 UTC vs.
Revision 1.127 by root, Sat Nov 17 23:40:02 2018 UTC

…		…
		1	/*
		2	* This file is part of Deliantra, the Roguelike Realtime MMORPG.
		3	*
		4	* Copyright (©) 2017,2018 Marc Alexander Lehmann / the Deliantra team
		5	* Copyright (©) 2005,2006,2007,2008,2009,2010,2011,2012,2013,2014,2015,2016 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
		6	*
		7	* Deliantra is free software: you can redistribute it and/or modify it under
		8	* the terms of the Affero GNU General Public License as published by the
		9	* Free Software Foundation, either version 3 of the License, or (at your
		10	* option) any later version.
		11	*
		12	* This program is distributed in the hope that it will be useful,
		13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
		14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
		15	* GNU General Public License for more details.
		16	*
		17	* You should have received a copy of the Affero GNU General Public License
		18	* and the GNU General Public License along with this program. If not, see
		19	* <http://www.gnu.org/licenses/>.
		20	*
		21	* The authors can be reached via e-mail to <support@deliantra.net>
		22	*/
		23
1	#ifndef UTIL_H__	24	#ifndef UTIL_H__
2	#define UTIL_H__	25	#define UTIL_H__
3		26
4	//#define PREFER_MALLOC	27	#include <compiler.h>
5		28
6	#if __GNUC__ >= 3	29	#define DEBUG_POISON 0x00 // poison memory before freeing it if != 0
7	# define is_constant(c) __builtin_constant_p (c)	30	#define DEBUG_SALLOC 0 // add a debug wrapper around all sallocs
8	#else	31	#define PREFER_MALLOC 0 // use malloc and not the slice allocator
9	# define is_constant(c) 0	32
10	#endif	33	#include <pthread.h>
11		34
12	#include <cstddef>	35	#include <cstddef>
13	#include <cmath>	36	#include <cmath>
14	#include <new>	37	#include <new>
15	#include <vector>	38	#include <vector>
17	#include <glib.h>	40	#include <glib.h>
18		41
19	#include <shstr.h>	42	#include <shstr.h>
20	#include <traits.h>	43	#include <traits.h>
21		44
		45	#if DEBUG_SALLOC
		46	# define g_slice_alloc0(s) debug_slice_alloc0(s)
		47	# define g_slice_alloc(s) debug_slice_alloc(s)
		48	# define g_slice_free1(s,p) debug_slice_free1(s,p)
		49	void *g_slice_alloc (unsigned long size);
		50	void *g_slice_alloc0 (unsigned long size);
		51	void g_slice_free1 (unsigned long size, void *ptr);
		52	#elif PREFER_MALLOC
		53	# define g_slice_alloc0(s) calloc (1, (s))
		54	# define g_slice_alloc(s) malloc ((s))
		55	# define g_slice_free1(s,p) free ((p))
		56	#endif
		57
22	// use a gcc extension for auto declarations until ISO C++ sanctifies them	58	// use C0X decltype for auto declarations until ISO C++ sanctifies them (if ever)
23	#define auto(var,expr) typeof(expr) var = (expr)	59	#define auto(var,expr) decltype(expr) var = (expr)
24		60
		61	#if cplusplus_does_not_suck /* still sucks in codesize with gcc 6, although local types work now */
		62	// does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm)
		63	template<typename T, int N>
		64	static inline int array_length (const T (&arr)[N])
		65	{
		66	return N;
		67	}
		68	#else
		69	#define array_length(name) (sizeof (name) / sizeof (name [0]))
		70	#endif
		71
25	// very ugly macro that basicaly declares and initialises a variable	72	// very ugly macro that basically declares and initialises a variable
26	// that is in scope for the next statement only	73	// that is in scope for the next statement only
27	// works only for stuff that can be assigned 0 and converts to false	74	// works only for stuff that can be assigned 0 and converts to false
28	// (note: works great for pointers)	75	// (note: works great for pointers)
29	// most ugly macro I ever wrote	76	// most ugly macro I ever wrote
30	#define declvar(type, name, value) if (type name = 0) { } else if (((name) = (value)), 1)	77	#define statementvar(type, name, value) if (type name = 0) { } else if (((name) = (value)), 1)
31		78
32	// in range including end	79	// in range including end
33	#define IN_RANGE_INC(val,beg,end) \	80	#define IN_RANGE_INC(val,beg,end) \
34	((unsigned int)(val) - (unsigned int)(beg) <= (unsigned int)(end) - (unsigned int)(beg))	81	((unsigned int)(val) - (unsigned int)(beg) <= (unsigned int)(end) - (unsigned int)(beg))
35		82
36	// in range excluding end	83	// in range excluding end
37	#define IN_RANGE_EXC(val,beg,end) \	84	#define IN_RANGE_EXC(val,beg,end) \
38	((unsigned int)(val) - (unsigned int)(beg) < (unsigned int)(end) - (unsigned int)(beg))	85	((unsigned int)(val) - (unsigned int)(beg) < (unsigned int)(end) - (unsigned int)(beg))
39		86
		87	ecb_cold void cleanup (const char *cause, bool make_core = false);
40	void fork_abort (const char *msg);	88	ecb_cold void fork_abort (const char *msg);
41		89
42	// rationale for using (U) not (T) is to reduce signed/unsigned issues,	90	// 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.	91	// 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; }	92	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; }	93	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; }	94	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		95
		96	template<typename T, typename U> static inline void min_it (T &v, U m) { v = min (v, (T)m); }
		97	template<typename T, typename U> static inline void max_it (T &v, U m) { v = max (v, (T)m); }
		98	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); }
		99
48	template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; }	100	template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; }
		101
		102	template<typename T, typename U, typename V> static inline T min (T a, U b, V c) { return min (a, min (b, c)); }
		103	template<typename T, typename U, typename V> static inline T max (T a, U b, V c) { return max (a, max (b, c)); }
		104
		105	// sign returns -1 or +1
		106	template<typename T>
		107	static inline T sign (T v) { return v < 0 ? -1 : +1; }
		108	// relies on 2c representation
		109	template<>
		110	inline sint8 sign (sint8 v) { return 1 - (sint8 (uint8 (v) >> 7) * 2); }
		111	template<>
		112	inline sint16 sign (sint16 v) { return 1 - (sint16 (uint16 (v) >> 15) * 2); }
		113	template<>
		114	inline sint32 sign (sint32 v) { return 1 - (sint32 (uint32 (v) >> 31) * 2); }
		115
		116	// sign0 returns -1, 0 or +1
		117	template<typename T>
		118	static inline T sign0 (T v) { return v ? sign (v) : 0; }
		119
		120	//clashes with C++0x
		121	template<typename T, typename U>
		122	static inline T copysign (T a, U b) { return a > 0 ? b : -b; }
		123
		124	// div* only work correctly for div > 0
		125	// div, with correct rounding (< 0.5 downwards, >=0.5 upwards)
		126	template<typename T> static inline T div (T val, T div)
		127	{
		128	return expect_false (val < 0) ? - ((-val + (div - 1) / 2) / div) : (val + div / 2) / div;
		129	}
		130
		131	template<> inline float div (float val, float div) { return val / div; }
		132	template<> inline double div (double val, double div) { return val / div; }
		133
		134	// div, round-up
		135	template<typename T> static inline T div_ru (T val, T div)
		136	{
		137	return expect_false (val < 0) ? - ((-val ) / div) : (val + div - 1) / div;
		138	}
		139	// div, round-down
		140	template<typename T> static inline T div_rd (T val, T div)
		141	{
		142	return expect_false (val < 0) ? - ((-val + (div - 1) ) / div) : (val ) / div;
		143	}
		144
		145	// lerp* only work correctly for min_in < max_in
		146	// Linear intERPolate, scales val from min_in..max_in to min_out..max_out
		147	template<typename T>
		148	static inline T
		149	lerp (T val, T min_in, T max_in, T min_out, T max_out)
		150	{
		151	return min_out + div <T> ((val - min_in) * (max_out - min_out), max_in - min_in);
		152	}
		153
		154	// lerp, round-down
		155	template<typename T>
		156	static inline T
		157	lerp_rd (T val, T min_in, T max_in, T min_out, T max_out)
		158	{
		159	return min_out + div_rd<T> ((val - min_in) * (max_out - min_out), max_in - min_in);
		160	}
		161
		162	// lerp, round-up
		163	template<typename T>
		164	static inline T
		165	lerp_ru (T val, T min_in, T max_in, T min_out, T max_out)
		166	{
		167	return min_out + div_ru<T> ((val - min_in) * (max_out - min_out), max_in - min_in);
		168	}
49		169
50	// lots of stuff taken from FXT	170	// lots of stuff taken from FXT
51		171
52	/* Rotate right. This is used in various places for checksumming */	172	/* Rotate right. This is used in various places for checksumming */
53	//TODO: that sucks, use a better checksum algo	173	//TODO: that sucks, use a better checksum algo
…		…
90	int32_t d = b - a;	210	int32_t d = b - a;
91	d &= d >> 31;	211	d &= d >> 31;
92	return b - d;	212	return b - d;
93	}	213	}
94		214
95	// this is much faster than crossfires original algorithm	215	// this is much faster than crossfire's original algorithm
96	// on modern cpus	216	// on modern cpus
97	inline int	217	inline int
98	isqrt (int n)	218	isqrt (int n)
99	{	219	{
100	return (int)sqrtf ((float)n);	220	return (int)sqrtf ((float)n);
		221	}
		222
		223	// this is kind of like the ^^ operator, if it would exist, without sequence point.
		224	// more handy than it looks like, due to the implicit !! done on its arguments
		225	inline bool
		226	logical_xor (bool a, bool b)
		227	{
		228	return a != b;
		229	}
		230
		231	inline bool
		232	logical_implies (bool a, bool b)
		233	{
		234	return a <= b;
101	}	235	}
102		236
103	// this is only twice as fast as naive sqrtf (dxdy+dydy)	237	// this is only twice as fast as naive sqrtf (dxdy+dydy)
104	#if 0	238	#if 0
105	// and has a max. error of 6 in the range -100..+100.	239	// and has a max. error of 6 in the range -100..+100.
106	#else	240	#else
107	// and has a max. error of 9 in the range -100..+100.	241	// and has a max. error of 9 in the range -100..+100.
108	#endif	242	#endif
109	inline int	243	inline int
110	idistance (int dx, int dy)	244	idistance (int dx, int dy)
111	{	245	{
112	unsigned int dx_ = abs (dx);	246	unsigned int dx_ = abs (dx);
113	unsigned int dy_ = abs (dy);	247	unsigned int dy_ = abs (dy);
114		248
115	#if 0	249	#if 0
116	return dx_ > dy_	250	return dx_ > dy_
…		…
119	#else	253	#else
120	return dx_ + dy_ - min (dx_, dy_) * 5 / 8;	254	return dx_ + dy_ - min (dx_, dy_) * 5 / 8;
121	#endif	255	#endif
122	}	256	}
123		257
		258	// can be substantially faster than floor, if your value range allows for it
		259	template<typename T>
		260	inline T
		261	fastfloor (T x)
		262	{
		263	return std::floor (x);
		264	}
		265
		266	inline float
		267	fastfloor (float x)
		268	{
		269	return sint32(x) - (x < 0);
		270	}
		271
		272	inline double
		273	fastfloor (double x)
		274	{
		275	return sint64(x) - (x < 0);
		276	}
		277
124	/*	278	/*
125	* absdir(int): Returns a number between 1 and 8, which represent	279	* absdir(int): Returns a number between 1 and 8, which represent
126	* the "absolute" direction of a number (it actually takes care of	280	* the "absolute" direction of a number (it actually takes care of
127	* "overflow" in previous calculations of a direction).	281	* "overflow" in previous calculations of a direction).
128	*/	282	*/
…		…
130	absdir (int d)	284	absdir (int d)
131	{	285	{
132	return ((d - 1) & 7) + 1;	286	return ((d - 1) & 7) + 1;
133	}	287	}
134		288
		289	#define for_all_bits_sparse_32(mask, idxvar) \
		290	for (uint32_t idxvar, mask_ = mask; \
		291	mask_ && ((idxvar = ecb_ctz32 (mask_)), mask_ &= ~(1 << idxvar), 1);)
		292
		293	extern ssize_t slice_alloc; // statistics
		294
		295	void *salloc_ (int n);
		296	void salloc_ (int n, void src);
		297
		298	// strictly the same as g_slice_alloc, but never returns 0
		299	template<typename T>
		300	inline T salloc (int n = 1) { return (T )salloc_ (n * sizeof (T)); }
		301
		302	// also copies src into the new area, like "memdup"
		303	// if src is 0, clears the memory
		304	template<typename T>
		305	inline T salloc (int n, T src) { return (T )salloc_ (n sizeof (T), (void *)src); }
		306
		307	// clears the memory
		308	template<typename T>
		309	inline T salloc0(int n = 1) { return (T )salloc_ (n * sizeof (T), 0); }
		310
		311	// for symmetry
		312	template<typename T>
		313	inline void sfree (T *ptr, int n = 1) noexcept
		314	{
		315	if (expect_true (ptr))
		316	{
		317	slice_alloc -= n * sizeof (T);
		318	if (DEBUG_POISON) memset (ptr, DEBUG_POISON, n * sizeof (T));
		319	g_slice_free1 (n * sizeof (T), (void *)ptr);
		320	}
		321	}
		322
		323	// nulls the pointer
		324	template<typename T>
		325	inline void sfree0 (T *&ptr, int n = 1) noexcept
		326	{
		327	sfree<T> (ptr, n);
		328	ptr = 0;
		329	}
		330
135	// makes dynamically allocated objects zero-initialised	331	// makes dynamically allocated objects zero-initialised
136	struct zero_initialised	332	struct zero_initialised
137	{	333	{
138	void operator new (size_t s, void p)	334	void operator new (size_t s, void p)
139	{	335	{
…		…
141	return p;	337	return p;
142	}	338	}
143		339
144	void *operator new (size_t s)	340	void *operator new (size_t s)
145	{	341	{
146	return g_slice_alloc0 (s);	342	return salloc0<char> (s);
147	}	343	}
148		344
149	void *operator new[] (size_t s)	345	void *operator new[] (size_t s)
150	{	346	{
151	return g_slice_alloc0 (s);	347	return salloc0<char> (s);
152	}	348	}
153		349
154	void operator delete (void *p, size_t s)	350	void operator delete (void *p, size_t s)
155	{	351	{
156	g_slice_free1 (s, p);	352	sfree ((char *)p, s);
157	}	353	}
158		354
159	void operator delete[] (void *p, size_t s)	355	void operator delete[] (void *p, size_t s)
160	{	356	{
161	g_slice_free1 (s, p);	357	sfree ((char *)p, s);
162	}	358	}
163	};	359	};
164		360
165	void *salloc_ (int n) throw (std::bad_alloc);	361	// makes dynamically allocated objects zero-initialised
166	void salloc_ (int n, void src) throw (std::bad_alloc);	362	struct slice_allocated
167
168	// strictly the same as g_slice_alloc, but never returns 0
169	template<typename T>
170	inline T salloc (int n = 1) throw (std::bad_alloc) { return (T )salloc_ (n * sizeof (T)); }
171
172	// also copies src into the new area, like "memdup"
173	// if src is 0, clears the memory
174	template<typename T>
175	inline T salloc (int n, T src) throw (std::bad_alloc) { return (T )salloc_ (n sizeof (T), (void *)src); }
176
177	// clears the memory
178	template<typename T>
179	inline T salloc0(int n = 1) throw (std::bad_alloc) { return (T )salloc_ (n * sizeof (T), 0); }
180
181	// for symmetry
182	template<typename T>
183	inline void sfree (T *ptr, int n = 1) throw ()
184	{	363	{
185	#ifdef PREFER_MALLOC	364	void operator new (size_t s, void p)
186	free (ptr);	365	{
187	#else	366	return p;
188	g_slice_free1 (n * sizeof (T), (void *)ptr);	367	}
189	#endif	368
190	}	369	void *operator new (size_t s)
		370	{
		371	return salloc<char> (s);
		372	}
		373
		374	void *operator new[] (size_t s)
		375	{
		376	return salloc<char> (s);
		377	}
		378
		379	void operator delete (void *p, size_t s)
		380	{
		381	sfree ((char *)p, s);
		382	}
		383
		384	void operator delete[] (void *p, size_t s)
		385	{
		386	sfree ((char *)p, s);
		387	}
		388	};
191		389
192	// a STL-compatible allocator that uses g_slice	390	// a STL-compatible allocator that uses g_slice
193	// boy, this is verbose	391	// boy, this is verbose
194	template<typename Tp>	392	template<typename Tp>
195	struct slice_allocator	393	struct slice_allocator
…		…
200	typedef const Tp *const_pointer;	398	typedef const Tp *const_pointer;
201	typedef Tp &reference;	399	typedef Tp &reference;
202	typedef const Tp &const_reference;	400	typedef const Tp &const_reference;
203	typedef Tp value_type;	401	typedef Tp value_type;
204		402
205	template <class U>	403	template <class U>
206	struct rebind	404	struct rebind
207	{	405	{
208	typedef slice_allocator<U> other;	406	typedef slice_allocator<U> other;
209	};	407	};
210		408
211	slice_allocator () throw () { }	409	slice_allocator () noexcept { }
212	slice_allocator (const slice_allocator &o) throw () { }	410	slice_allocator (const slice_allocator &) noexcept { }
213	template<typename Tp2>	411	template<typename Tp2>
214	slice_allocator (const slice_allocator<Tp2> &) throw () { }	412	slice_allocator (const slice_allocator<Tp2> &) noexcept { }
215		413
216	~slice_allocator () { }	414	~slice_allocator () { }
217		415
218	pointer address (reference x) const { return &x; }	416	pointer address (reference x) const { return &x; }
219	const_pointer address (const_reference x) const { return &x; }	417	const_pointer address (const_reference x) const { return &x; }
…		…
226	void deallocate (pointer p, size_type n)	424	void deallocate (pointer p, size_type n)
227	{	425	{
228	sfree<Tp> (p, n);	426	sfree<Tp> (p, n);
229	}	427	}
230		428
231	size_type max_size ()const throw ()	429	size_type max_size () const noexcept
232	{	430	{
233	return size_t (-1) / sizeof (Tp);	431	return size_t (-1) / sizeof (Tp);
234	}	432	}
235		433
236	void construct (pointer p, const Tp &val)	434	void construct (pointer p, const Tp &val)
…		…
242	{	440	{
243	p->~Tp ();	441	p->~Tp ();
244	}	442	}
245	};	443	};
246		444
247	// P. L'Ecuyer, “Maximally Equidistributed Combined Tausworthe Generators”, Mathematics of Computation, 65, 213 (1996), 203–213.	445	// basically a memory area, but refcounted
248	// http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme.ps	446	struct refcnt_buf
249	// http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme2.ps
250	struct tausworthe_random_generator
251	{	447	{
252	// generator	448	char *data;
253	uint32_t state [4];
254		449
255	void operator =(const tausworthe_random_generator &src)	450	refcnt_buf (size_t size = 0);
256	{	451	refcnt_buf (void *data, size_t size);
257	state [0] = src.state [0];
258	state [1] = src.state [1];
259	state [2] = src.state [2];
260	state [3] = src.state [3];
261	}
262		452
263	void seed (uint32_t seed);	453	refcnt_buf (const refcnt_buf &src)
264	uint32_t next ();
265
266	// uniform distribution
267	uint32_t operator ()(uint32_t r_max)
268	{	454	{
269	return is_constant (r_max)	455	data = src.data;
270	? (next () * (uint64_t)r_max) >> 32U	456	inc ();
271	: get_range (r_max);
272	}	457	}
273		458
274	// return a number within (min .. max)	459	~refcnt_buf ();
275	int operator () (int r_min, int r_max)
276	{
277	return is_constant (r_min) && is_constant (r_max)
278	? r_min + operator ()(max (r_max - r_min + 1, 1))
279	: get_range (r_min, r_max);
280	}
281		460
282	double operator ()()	461	refcnt_buf &operator =(const refcnt_buf &src);
		462
		463	operator char *()
283	{	464	{
284	return this->next () / (double)0xFFFFFFFFU;	465	return data;
		466	}
		467
		468	size_t size () const
		469	{
		470	return _size ();
285	}	471	}
286		472
287	protected:	473	protected:
288	uint32_t get_range (uint32_t r_max);	474	enum {
289	int get_range (int r_min, int r_max);	475	overhead = sizeof (uint32_t) * 2
290	};	476	};
291		477
292	typedef tausworthe_random_generator rand_gen;	478	uint32_t &_size () const
		479	{
		480	return ((unsigned int *)data)[-2];
		481	}
293		482
294	extern rand_gen rndm;	483	uint32_t &_refcnt () const
		484	{
		485	return ((unsigned int *)data)[-1];
		486	}
		487
		488	void _alloc (uint32_t size)
		489	{
		490	data = ((char *)salloc<char> (size + overhead)) + overhead;
		491	_size () = size;
		492	_refcnt () = 1;
		493	}
		494
		495	void _dealloc ();
		496
		497	void inc ()
		498	{
		499	++_refcnt ();
		500	}
		501
		502	void dec ()
		503	{
		504	if (!--_refcnt ())
		505	_dealloc ();
		506	}
		507	};
		508
		509	INTERFACE_CLASS (attachable)
		510	struct refcnt_base
		511	{
		512	typedef int refcnt_t;
		513	mutable refcnt_t ACC (RW, refcnt);
		514
		515	MTH void refcnt_inc () const { ++refcnt; }
		516	MTH void refcnt_dec () const { --refcnt; }
		517
		518	refcnt_base () : refcnt (0) { }
		519	};
		520
		521	// to avoid branches with more advanced compilers
		522	extern refcnt_base::refcnt_t refcnt_dummy;
295		523
296	template<class T>	524	template<class T>
297	struct refptr	525	struct refptr
298	{	526	{
		527	// p if not null
		528	refcnt_base::refcnt_t *refcnt_ref () { return p ? &p->refcnt : &refcnt_dummy; }
		529
		530	void refcnt_dec ()
		531	{
		532	if (!ecb_is_constant (p))
		533	--*refcnt_ref ();
		534	else if (p)
		535	--p->refcnt;
		536	}
		537
		538	void refcnt_inc ()
		539	{
		540	if (!ecb_is_constant (p))
		541	++*refcnt_ref ();
		542	else if (p)
		543	++p->refcnt;
		544	}
		545
299	T *p;	546	T *p;
300		547
301	refptr () : p(0) { }	548	refptr () : p(0) { }
302	refptr (const refptr<T> &p) : p(p.p) { if (p) p->refcnt_inc (); }	549	refptr (const refptr<T> &p) : p(p.p) { refcnt_inc (); }
303	refptr (T *p) : p(p) { if (p) p->refcnt_inc (); }	550	refptr (T *p) : p(p) { refcnt_inc (); }
304	~refptr () { if (p) p->refcnt_dec (); }	551	~refptr () { refcnt_dec (); }
305		552
306	const refptr<T> &operator =(T *o)	553	const refptr<T> &operator =(T *o)
307	{	554	{
		555	// if decrementing ever destroys we need to reverse the order here
308	if (p) p->refcnt_dec ();	556	refcnt_dec ();
309	p = o;	557	p = o;
310	if (p) p->refcnt_inc ();	558	refcnt_inc ();
311
312	return *this;	559	return *this;
313	}	560	}
314		561
315	const refptr<T> &operator =(const refptr<T> o)	562	const refptr<T> &operator =(const refptr<T> &o)
316	{	563	{
317	*this = o.p;	564	*this = o.p;
318	return *this;	565	return *this;
319	}	566	}
320		567
321	T &operator * () const { return *p; }	568	T &operator * () const { return *p; }
322	T *operator ->() const { return p; }	569	T *operator ->() const { return p; }
323		570
324	operator T *() const { return p; }	571	operator T *() const { return p; }
325	};	572	};
326		573
327	typedef refptr<maptile> maptile_ptr;	574	typedef refptr<maptile> maptile_ptr;
328	typedef refptr<object> object_ptr;	575	typedef refptr<object> object_ptr;
329	typedef refptr<archetype> arch_ptr;	576	typedef refptr<archetype> arch_ptr;
330	typedef refptr<client> client_ptr;	577	typedef refptr<client> client_ptr;
331	typedef refptr<player> player_ptr;	578	typedef refptr<player> player_ptr;
		579	typedef refptr<region> region_ptr;
		580
		581	#define STRHSH_NULL 2166136261
		582
		583	static inline uint32_t
		584	strhsh (const char *s)
		585	{
		586	// use FNV-1a hash (http://isthe.com/chongo/tech/comp/fnv/)
		587	// it is about twice as fast as the one-at-a-time one,
		588	// with good distribution.
		589	// FNV-1a is faster on many cpus because the multiplication
		590	// runs concurrently with the looping logic.
		591	// we modify the hash a bit to improve its distribution
		592	uint32_t hash = STRHSH_NULL;
		593
		594	while (*s)
		595	hash = (hash ^ s++) 16777619U;
		596
		597	return hash ^ (hash >> 16);
		598	}
		599
		600	static inline uint32_t
		601	memhsh (const char *s, size_t len)
		602	{
		603	uint32_t hash = STRHSH_NULL;
		604
		605	while (len--)
		606	hash = (hash ^ s++) 16777619U;
		607
		608	return hash;
		609	}
332		610
333	struct str_hash	611	struct str_hash
334	{	612	{
335	std::size_t operator ()(const char *s) const	613	std::size_t operator ()(const char *s) const
336	{	614	{
337	unsigned long hash = 0;
338
339	/* use the one-at-a-time hash function, which supposedly is
340	* better than the djb2-like one used by perl5.005, but
341	* certainly is better then the bug used here before.
342	* see http://burtleburtle.net/bob/hash/doobs.html
343	*/
344	while (*s)
345	{
346	hash += *s++;
347	hash += hash << 10;
348	hash ^= hash >> 6;
349	}
350
351	hash += hash << 3;
352	hash ^= hash >> 11;
353	hash += hash << 15;
354
355	return hash;	615	return strhsh (s);
		616	}
		617
		618	std::size_t operator ()(const shstr &s) const
		619	{
		620	return strhsh (s);
356	}	621	}
357	};	622	};
358		623
359	struct str_equal	624	struct str_equal
360	{	625	{
…		…
362	{	627	{
363	return !strcmp (a, b);	628	return !strcmp (a, b);
364	}	629	}
365	};	630	};
366		631
		632	// Mostly the same as std::vector, but insert/erase can reorder
		633	// the elements, making append(=insert)/remove O(1) instead of O(n).
		634	//
		635	// NOTE: only some forms of erase are available
367	template<class T>	636	template<class T>
368	struct unordered_vector : std::vector<T, slice_allocator<T> >	637	struct unordered_vector : std::vector<T, slice_allocator<T> >
369	{	638	{
370	typedef typename unordered_vector::iterator iterator;	639	typedef typename unordered_vector::iterator iterator;
371		640
…		…
381	{	650	{
382	erase ((unsigned int )(i - this->begin ()));	651	erase ((unsigned int )(i - this->begin ()));
383	}	652	}
384	};	653	};
385		654
386	template<class T, int T::* index>	655	// This container blends advantages of linked lists
		656	// (efficiency) with vectors (random access) by
		657	// using an unordered vector and storing the vector
		658	// index inside the object.
		659	//
		660	// + memory-efficient on most 64 bit archs
		661	// + O(1) insert/remove
		662	// + free unique (but varying) id for inserted objects
		663	// + cache-friendly iteration
		664	// - only works for pointers to structs
		665	//
		666	// NOTE: only some forms of erase/insert are available
		667	typedef int object_vector_index;
		668
		669	template<class T, object_vector_index T::*indexmember>
387	struct object_vector : std::vector<T , slice_allocator<T > >	670	struct object_vector : std::vector<T , slice_allocator<T > >
388	{	671	{
		672	typedef typename object_vector::iterator iterator;
		673
		674	bool contains (const T *obj) const
		675	{
		676	return obj->*indexmember;
		677	}
		678
		679	iterator find (const T *obj)
		680	{
		681	return obj->*indexmember
		682	? this->begin () + obj->*indexmember - 1
		683	: this->end ();
		684	}
		685
		686	void push_back (T *obj)
		687	{
		688	std::vector<T , slice_allocator<T > >::push_back (obj);
		689	obj->*indexmember = this->size ();
		690	}
		691
389	void insert (T *obj)	692	void insert (T *obj)
390	{	693	{
391	assert (!(obj->*index));
392	push_back (obj);	694	push_back (obj);
393	obj->*index = this->size ();
394	}	695	}
395		696
396	void insert (T &obj)	697	void insert (T &obj)
397	{	698	{
398	insert (&obj);	699	insert (&obj);
399	}	700	}
400		701
401	void erase (T *obj)	702	void erase (T *obj)
402	{	703	{
403	assert (obj->*index);	704	object_vector_index pos = obj->*indexmember;
404	unsigned int pos = obj->*index;
405	obj->*index = 0;	705	obj->*indexmember = 0;
406		706
407	if (pos < this->size ())	707	if (pos < this->size ())
408	{	708	{
409	(this)[pos - 1] = (this)[this->size () - 1];	709	(this)[pos - 1] = (this)[this->size () - 1];
410	(this)[pos - 1]->index = pos;	710	(this)[pos - 1]->indexmember = pos;
411	}	711	}
412		712
413	this->pop_back ();	713	this->pop_back ();
414	}	714	}
415		715
416	void erase (T &obj)	716	void erase (T &obj)
417	{	717	{
418	errase (&obj);	718	erase (&obj);
419	}	719	}
420	};	720	};
		721
		722	/////////////////////////////////////////////////////////////////////////////
		723
		724	// something like a vector or stack, but without
		725	// out of bounds checking
		726	template<typename T>
		727	struct fixed_stack
		728	{
		729	T *data;
		730	int size;
		731	int max;
		732
		733	fixed_stack ()
		734	: size (0), data (0)
		735	{
		736	}
		737
		738	fixed_stack (int max)
		739	: size (0), max (max)
		740	{
		741	data = salloc<T> (max);
		742	}
		743
		744	void reset (int new_max)
		745	{
		746	sfree (data, max);
		747	size = 0;
		748	max = new_max;
		749	data = salloc<T> (max);
		750	}
		751
		752	void free ()
		753	{
		754	sfree (data, max);
		755	data = 0;
		756	}
		757
		758	~fixed_stack ()
		759	{
		760	sfree (data, max);
		761	}
		762
		763	T &operator[](int idx)
		764	{
		765	return data [idx];
		766	}
		767
		768	void push (T v)
		769	{
		770	data [size++] = v;
		771	}
		772
		773	T &pop ()
		774	{
		775	return data [--size];
		776	}
		777
		778	T remove (int idx)
		779	{
		780	T v = data [idx];
		781
		782	data [idx] = data [--size];
		783
		784	return v;
		785	}
		786	};
		787
		788	/////////////////////////////////////////////////////////////////////////////
421		789
422	// basically does what strncpy should do, but appends "..." to strings exceeding length	790	// basically does what strncpy should do, but appends "..." to strings exceeding length
		791	// returns the number of bytes actually used (including \0)
423	void assign (char dst, const char src, int maxlen);	792	int assign (char dst, const char src, int maxsize);
424		793
425	// type-safe version of assign	794	// type-safe version of assign
426	template<int N>	795	template<int N>
427	inline void assign (char (&dst)[N], const char *src)	796	inline int assign (char (&dst)[N], const char *src)
428	{	797	{
429	assign ((char *)&dst, src, N);	798	return assign ((char *)&dst, src, N);
430	}	799	}
431		800
432	typedef double tstamp;	801	typedef double tstamp;
433		802
434	// return current time as timestampe	803	// return current time as timestamp
435	tstamp now ();	804	tstamp now ();
436		805
437	int similar_direction (int a, int b);	806	int similar_direction (int a, int b);
438		807
		808	// like v?sprintf, but returns a "static" buffer
		809	char vformat (const char format, va_list ap);
		810	char format (const char format, ...) ecb_attribute ((format (printf, 1, 2)));
		811
		812	// safety-check player input which will become object->msg
		813	bool msg_is_safe (const char *msg);
		814
		815	/////////////////////////////////////////////////////////////////////////////
		816	// threads, very very thin wrappers around pthreads
		817
		818	struct thread
		819	{
		820	pthread_t id;
		821
		822	void start (void (start_routine)(void ), void arg = 0);
		823
		824	void cancel ()
		825	{
		826	pthread_cancel (id);
		827	}
		828
		829	void *join ()
		830	{
		831	void *ret;
		832
		833	if (pthread_join (id, &ret))
		834	cleanup ("pthread_join failed", 1);
		835
		836	return ret;
		837	}
		838	};
		839
		840	// note that mutexes are not classes
		841	typedef pthread_mutex_t smutex;
		842
		843	#if __linux && defined (PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP)
		844	#define SMUTEX_INITIALISER PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP
		845	#else
		846	#define SMUTEX_INITIALISER PTHREAD_MUTEX_INITIALIZER
439	#endif	847	#endif
440		848
		849	#define SMUTEX(name) smutex name = SMUTEX_INITIALISER
		850	#define SMUTEX_LOCK(name) pthread_mutex_lock (&(name))
		851	#define SMUTEX_UNLOCK(name) pthread_mutex_unlock (&(name))
		852
		853	typedef pthread_cond_t scond;
		854
		855	#define SCOND(name) scond name = PTHREAD_COND_INITIALIZER
		856	#define SCOND_SIGNAL(name) pthread_cond_signal (&(name))
		857	#define SCOND_BROADCAST(name) pthread_cond_broadcast (&(name))
		858	#define SCOND_WAIT(name,mutex) pthread_cond_wait (&(name), &(mutex))
		859
		860	#endif
		861

Diff Legend

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

Comparing deliantra/server/include/util.h (file contents): Revision 1.41 by root, Sat Apr 21 22:57:16 2007 UTC vs. Revision 1.127 by root, Sat Nov 17 23:40:02 2018 UTC

Diff Legend

Comparing deliantra/server/include/util.h (file contents):
Revision 1.41 by root, Sat Apr 21 22:57:16 2007 UTC vs.
Revision 1.127 by root, Sat Nov 17 23:40:02 2018 UTC