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

Comparing deliantra/server/include/util.h (file contents):
Revision 1.45 by root, Sat May 26 15:44:05 2007 UTC vs.
Revision 1.114 by root, Sat Apr 23 04:56:51 2011 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	# define expect(expr,value) __builtin_expect ((expr),(value))	30	#define PREFER_MALLOC 0 // use malloc and not the slice allocator
9	# define prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
10	#else
11	# define is_constant(c) 0
12	# define expect(expr,value) (expr)
13	# define prefetch(addr,rw,locality)
14	#endif
15		31
16	// put into ifs if you are very sure that the expression	32	#include <pthread.h>
17	// is mostly true or mosty false. note that these return
18	// booleans, not the expression.
19	#define expect_false(expr) expect ((expr) != 0, 0)
20	#define expect_true(expr) expect ((expr) != 0, 1)
21		33
22	#include <cstddef>	34	#include <cstddef>
23	#include <cmath>	35	#include <cmath>
24	#include <new>	36	#include <new>
25	#include <vector>	37	#include <vector>
27	#include <glib.h>	39	#include <glib.h>
28		40
29	#include <shstr.h>	41	#include <shstr.h>
30	#include <traits.h>	42	#include <traits.h>
31		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
32	// 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)
33	#define auto(var,expr) typeof(expr) var = (expr)	58	#define auto(var,expr) decltype(expr) var = (expr)
34		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
35	// very ugly macro that basicaly declares and initialises a variable	71	// very ugly macro that basically declares and initialises a variable
36	// that is in scope for the next statement only	72	// that is in scope for the next statement only
37	// 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
38	// (note: works great for pointers)	74	// (note: works great for pointers)
39	// most ugly macro I ever wrote	75	// most ugly macro I ever wrote
40	#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)
41		77
42	// in range including end	78	// in range including end
43	#define IN_RANGE_INC(val,beg,end) \	79	#define IN_RANGE_INC(val,beg,end) \
44	((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))
45		81
46	// in range excluding end	82	// in range excluding end
47	#define IN_RANGE_EXC(val,beg,end) \	83	#define IN_RANGE_EXC(val,beg,end) \
48	((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))
49		85
		86	void cleanup (const char *cause, bool make_core = false);
50	void fork_abort (const char *msg);	87	void fork_abort (const char *msg);
51		88
52	// 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,
53	// 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.
54	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 (U)a < b ? (U)a : b; }
55	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 (U)a > b ? (U)a : b; }
56	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; }
57		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
58	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; }
59		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
60	template<typename T>	146	template<typename T>
61	static inline T	147	static inline T
62	lerp (T val, T min_in, T max_in, T min_out, T max_out)	148	lerp (T val, T min_in, T max_in, T min_out, T max_out)
63	{	149	{
64	return (val - min_in) * (max_out - min_out) / (max_in - min_in) + min_out;	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);
65	}	167	}
66		168
67	// lots of stuff taken from FXT	169	// lots of stuff taken from FXT
68		170
69	/* Rotate right. This is used in various places for checksumming */	171	/* Rotate right. This is used in various places for checksumming */
…		…
107	int32_t d = b - a;	209	int32_t d = b - a;
108	d &= d >> 31;	210	d &= d >> 31;
109	return b - d;	211	return b - d;
110	}	212	}
111		213
112	// this is much faster than crossfires original algorithm	214	// this is much faster than crossfire's original algorithm
113	// on modern cpus	215	// on modern cpus
114	inline int	216	inline int
115	isqrt (int n)	217	isqrt (int n)
116	{	218	{
117	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;
118	}	234	}
119		235
120	// this is only twice as fast as naive sqrtf (dxdy+dydy)	236	// this is only twice as fast as naive sqrtf (dxdy+dydy)
121	#if 0	237	#if 0
122	// 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.
…		…
147	absdir (int d)	263	absdir (int d)
148	{	264	{
149	return ((d - 1) & 7) + 1;	265	return ((d - 1) & 7) + 1;
150	}	266	}
151		267
		268	// avoid ctz name because netbsd or freebsd spams it's namespace with it
		269	#if GCC_VERSION(3,4)
		270	static inline int least_significant_bit (uint32_t x)
		271	{
		272	return __builtin_ctz (x);
		273	}
		274	#else
		275	int least_significant_bit (uint32_t x);
		276	#endif
		277
		278	#define for_all_bits_sparse_32(mask, idxvar) \
		279	for (uint32_t idxvar, mask_ = mask; \
		280	mask_ && ((idxvar = least_significant_bit (mask_)), mask_ &= ~(1 << idxvar), 1);)
		281
		282	extern ssize_t slice_alloc; // statistics
		283
		284	void *salloc_ (int n) throw (std::bad_alloc);
		285	void salloc_ (int n, void src) throw (std::bad_alloc);
		286
		287	// strictly the same as g_slice_alloc, but never returns 0
		288	template<typename T>
		289	inline T salloc (int n = 1) throw (std::bad_alloc) { return (T )salloc_ (n * sizeof (T)); }
		290
		291	// also copies src into the new area, like "memdup"
		292	// if src is 0, clears the memory
		293	template<typename T>
		294	inline T salloc (int n, T src) throw (std::bad_alloc) { return (T )salloc_ (n sizeof (T), (void *)src); }
		295
		296	// clears the memory
		297	template<typename T>
		298	inline T salloc0(int n = 1) throw (std::bad_alloc) { return (T )salloc_ (n * sizeof (T), 0); }
		299
		300	// for symmetry
		301	template<typename T>
		302	inline void sfree (T *ptr, int n = 1) throw ()
		303	{
		304	if (expect_true (ptr))
		305	{
		306	slice_alloc -= n * sizeof (T);
		307	if (DEBUG_POISON) memset (ptr, DEBUG_POISON, n * sizeof (T));
		308	g_slice_free1 (n * sizeof (T), (void *)ptr);
		309	assert (slice_alloc >= 0);//D
		310	}
		311	}
		312
		313	// nulls the pointer
		314	template<typename T>
		315	inline void sfree0 (T *&ptr, int n = 1) throw ()
		316	{
		317	sfree<T> (ptr, n);
		318	ptr = 0;
		319	}
		320
152	// makes dynamically allocated objects zero-initialised	321	// makes dynamically allocated objects zero-initialised
153	struct zero_initialised	322	struct zero_initialised
154	{	323	{
155	void operator new (size_t s, void p)	324	void operator new (size_t s, void p)
156	{	325	{
…		…
158	return p;	327	return p;
159	}	328	}
160		329
161	void *operator new (size_t s)	330	void *operator new (size_t s)
162	{	331	{
163	return g_slice_alloc0 (s);	332	return salloc0<char> (s);
164	}	333	}
165		334
166	void *operator new[] (size_t s)	335	void *operator new[] (size_t s)
167	{	336	{
168	return g_slice_alloc0 (s);	337	return salloc0<char> (s);
169	}	338	}
170		339
171	void operator delete (void *p, size_t s)	340	void operator delete (void *p, size_t s)
172	{	341	{
173	g_slice_free1 (s, p);	342	sfree ((char *)p, s);
174	}	343	}
175		344
176	void operator delete[] (void *p, size_t s)	345	void operator delete[] (void *p, size_t s)
177	{	346	{
178	g_slice_free1 (s, p);	347	sfree ((char *)p, s);
179	}	348	}
180	};	349	};
181		350
182	void *salloc_ (int n) throw (std::bad_alloc);	351	// makes dynamically allocated objects zero-initialised
183	void salloc_ (int n, void src) throw (std::bad_alloc);	352	struct slice_allocated
184
185	// strictly the same as g_slice_alloc, but never returns 0
186	template<typename T>
187	inline T salloc (int n = 1) throw (std::bad_alloc) { return (T )salloc_ (n * sizeof (T)); }
188
189	// also copies src into the new area, like "memdup"
190	// if src is 0, clears the memory
191	template<typename T>
192	inline T salloc (int n, T src) throw (std::bad_alloc) { return (T )salloc_ (n sizeof (T), (void *)src); }
193
194	// clears the memory
195	template<typename T>
196	inline T salloc0(int n = 1) throw (std::bad_alloc) { return (T )salloc_ (n * sizeof (T), 0); }
197
198	// for symmetry
199	template<typename T>
200	inline void sfree (T *ptr, int n = 1) throw ()
201	{	353	{
202	#ifdef PREFER_MALLOC	354	void operator new (size_t s, void p)
203	free (ptr);	355	{
204	#else	356	return p;
205	g_slice_free1 (n * sizeof (T), (void *)ptr);	357	}
206	#endif	358
207	}	359	void *operator new (size_t s)
		360	{
		361	return salloc<char> (s);
		362	}
		363
		364	void *operator new[] (size_t s)
		365	{
		366	return salloc<char> (s);
		367	}
		368
		369	void operator delete (void *p, size_t s)
		370	{
		371	sfree ((char *)p, s);
		372	}
		373
		374	void operator delete[] (void *p, size_t s)
		375	{
		376	sfree ((char *)p, s);
		377	}
		378	};
208		379
209	// a STL-compatible allocator that uses g_slice	380	// a STL-compatible allocator that uses g_slice
210	// boy, this is verbose	381	// boy, this is verbose
211	template<typename Tp>	382	template<typename Tp>
212	struct slice_allocator	383	struct slice_allocator
…		…
224	{	395	{
225	typedef slice_allocator<U> other;	396	typedef slice_allocator<U> other;
226	};	397	};
227		398
228	slice_allocator () throw () { }	399	slice_allocator () throw () { }
229	slice_allocator (const slice_allocator &o) throw () { }	400	slice_allocator (const slice_allocator &) throw () { }
230	template<typename Tp2>	401	template<typename Tp2>
231	slice_allocator (const slice_allocator<Tp2> &) throw () { }	402	slice_allocator (const slice_allocator<Tp2> &) throw () { }
232		403
233	~slice_allocator () { }	404	~slice_allocator () { }
234		405
…		…
243	void deallocate (pointer p, size_type n)	414	void deallocate (pointer p, size_type n)
244	{	415	{
245	sfree<Tp> (p, n);	416	sfree<Tp> (p, n);
246	}	417	}
247		418
248	size_type max_size ()const throw ()	419	size_type max_size () const throw ()
249	{	420	{
250	return size_t (-1) / sizeof (Tp);	421	return size_t (-1) / sizeof (Tp);
251	}	422	}
252		423
253	void construct (pointer p, const Tp &val)	424	void construct (pointer p, const Tp &val)
…		…
259	{	430	{
260	p->~Tp ();	431	p->~Tp ();
261	}	432	}
262	};	433	};
263		434
264	// P. L'Ecuyer, “Maximally Equidistributed Combined Tausworthe Generators”, Mathematics of Computation, 65, 213 (1996), 203–213.	435	INTERFACE_CLASS (attachable)
265	// http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme.ps	436	struct refcnt_base
266	// http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme2.ps
267	struct tausworthe_random_generator
268	{	437	{
269	// generator	438	typedef int refcnt_t;
270	uint32_t state [4];	439	mutable refcnt_t ACC (RW, refcnt);
271		440
272	void operator =(const tausworthe_random_generator &src)	441	MTH void refcnt_inc () const { ++refcnt; }
273	{	442	MTH void refcnt_dec () const { --refcnt; }
274	state [0] = src.state [0];
275	state [1] = src.state [1];
276	state [2] = src.state [2];
277	state [3] = src.state [3];
278	}
279		443
280	void seed (uint32_t seed);	444	refcnt_base () : refcnt (0) { }
281	uint32_t next ();
282
283	// uniform distribution
284	uint32_t operator ()(uint32_t num)
285	{
286	return is_constant (num)
287	? (next () * (uint64_t)num) >> 32U
288	: get_range (num);
289	}
290
291	// return a number within (min .. max)
292	int operator () (int r_min, int r_max)
293	{
294	return is_constant (r_min) && is_constant (r_max) && r_min <= r_max
295	? r_min + operator ()(r_max - r_min + 1)
296	: get_range (r_min, r_max);
297	}
298
299	double operator ()()
300	{
301	return this->next () / (double)0xFFFFFFFFU;
302	}
303
304	protected:
305	uint32_t get_range (uint32_t r_max);
306	int get_range (int r_min, int r_max);
307	};	445	};
308		446
309	typedef tausworthe_random_generator rand_gen;	447	// to avoid branches with more advanced compilers
310		448	extern refcnt_base::refcnt_t refcnt_dummy;
311	extern rand_gen rndm;
312		449
313	template<class T>	450	template<class T>
314	struct refptr	451	struct refptr
315	{	452	{
		453	// p if not null
		454	refcnt_base::refcnt_t *refcnt_ref () { return p ? &p->refcnt : &refcnt_dummy; }
		455
		456	void refcnt_dec ()
		457	{
		458	if (!is_constant (p))
		459	--*refcnt_ref ();
		460	else if (p)
		461	--p->refcnt;
		462	}
		463
		464	void refcnt_inc ()
		465	{
		466	if (!is_constant (p))
		467	++*refcnt_ref ();
		468	else if (p)
		469	++p->refcnt;
		470	}
		471
316	T *p;	472	T *p;
317		473
318	refptr () : p(0) { }	474	refptr () : p(0) { }
319	refptr (const refptr<T> &p) : p(p.p) { if (p) p->refcnt_inc (); }	475	refptr (const refptr<T> &p) : p(p.p) { refcnt_inc (); }
320	refptr (T *p) : p(p) { if (p) p->refcnt_inc (); }	476	refptr (T *p) : p(p) { refcnt_inc (); }
321	~refptr () { if (p) p->refcnt_dec (); }	477	~refptr () { refcnt_dec (); }
322		478
323	const refptr<T> &operator =(T *o)	479	const refptr<T> &operator =(T *o)
324	{	480	{
		481	// if decrementing ever destroys we need to reverse the order here
325	if (p) p->refcnt_dec ();	482	refcnt_dec ();
326	p = o;	483	p = o;
327	if (p) p->refcnt_inc ();	484	refcnt_inc ();
328
329	return *this;	485	return *this;
330	}	486	}
331		487
332	const refptr<T> &operator =(const refptr<T> o)	488	const refptr<T> &operator =(const refptr<T> &o)
333	{	489	{
334	*this = o.p;	490	*this = o.p;
335	return *this;	491	return *this;
336	}	492	}
337		493
338	T &operator * () const { return *p; }	494	T &operator * () const { return *p; }
339	T *operator ->() const { return p; }	495	T *operator ->() const { return p; }
340		496
341	operator T *() const { return p; }	497	operator T *() const { return p; }
342	};	498	};
343		499
344	typedef refptr<maptile> maptile_ptr;	500	typedef refptr<maptile> maptile_ptr;
345	typedef refptr<object> object_ptr;	501	typedef refptr<object> object_ptr;
346	typedef refptr<archetype> arch_ptr;	502	typedef refptr<archetype> arch_ptr;
347	typedef refptr<client> client_ptr;	503	typedef refptr<client> client_ptr;
348	typedef refptr<player> player_ptr;	504	typedef refptr<player> player_ptr;
		505	typedef refptr<region> region_ptr;
		506
		507	#define STRHSH_NULL 2166136261
		508
		509	static inline uint32_t
		510	strhsh (const char *s)
		511	{
		512	// use FNV-1a hash (http://isthe.com/chongo/tech/comp/fnv/)
		513	// it is about twice as fast as the one-at-a-time one,
		514	// with good distribution.
		515	// FNV-1a is faster on many cpus because the multiplication
		516	// runs concurrently with the looping logic.
		517	// we modify the hash a bit to improve its distribution
		518	uint32_t hash = STRHSH_NULL;
		519
		520	while (*s)
		521	hash = (hash ^ s++) 16777619U;
		522
		523	return hash ^ (hash >> 16);
		524	}
		525
		526	static inline uint32_t
		527	memhsh (const char *s, size_t len)
		528	{
		529	uint32_t hash = STRHSH_NULL;
		530
		531	while (len--)
		532	hash = (hash ^ s++) 16777619U;
		533
		534	return hash;
		535	}
349		536
350	struct str_hash	537	struct str_hash
351	{	538	{
352	std::size_t operator ()(const char *s) const	539	std::size_t operator ()(const char *s) const
353	{	540	{
354	unsigned long hash = 0;
355
356	/* use the one-at-a-time hash function, which supposedly is
357	* better than the djb2-like one used by perl5.005, but
358	* certainly is better then the bug used here before.
359	* see http://burtleburtle.net/bob/hash/doobs.html
360	*/
361	while (*s)
362	{
363	hash += *s++;
364	hash += hash << 10;
365	hash ^= hash >> 6;
366	}
367
368	hash += hash << 3;
369	hash ^= hash >> 11;
370	hash += hash << 15;
371
372	return hash;	541	return strhsh (s);
		542	}
		543
		544	std::size_t operator ()(const shstr &s) const
		545	{
		546	return strhsh (s);
373	}	547	}
374	};	548	};
375		549
376	struct str_equal	550	struct str_equal
377	{	551	{
…		…
379	{	553	{
380	return !strcmp (a, b);	554	return !strcmp (a, b);
381	}	555	}
382	};	556	};
383		557
		558	// Mostly the same as std::vector, but insert/erase can reorder
		559	// the elements, making append(=insert)/remove O(1) instead of O(n).
		560	//
		561	// NOTE: only some forms of erase are available
384	template<class T>	562	template<class T>
385	struct unordered_vector : std::vector<T, slice_allocator<T> >	563	struct unordered_vector : std::vector<T, slice_allocator<T> >
386	{	564	{
387	typedef typename unordered_vector::iterator iterator;	565	typedef typename unordered_vector::iterator iterator;
388		566
…		…
398	{	576	{
399	erase ((unsigned int )(i - this->begin ()));	577	erase ((unsigned int )(i - this->begin ()));
400	}	578	}
401	};	579	};
402		580
403	template<class T, int T::* index>	581	// This container blends advantages of linked lists
		582	// (efficiency) with vectors (random access) by
		583	// by using an unordered vector and storing the vector
		584	// index inside the object.
		585	//
		586	// + memory-efficient on most 64 bit archs
		587	// + O(1) insert/remove
		588	// + free unique (but varying) id for inserted objects
		589	// + cache-friendly iteration
		590	// - only works for pointers to structs
		591	//
		592	// NOTE: only some forms of erase/insert are available
		593	typedef int object_vector_index;
		594
		595	template<class T, object_vector_index T::*indexmember>
404	struct object_vector : std::vector<T , slice_allocator<T > >	596	struct object_vector : std::vector<T , slice_allocator<T > >
405	{	597	{
		598	typedef typename object_vector::iterator iterator;
		599
		600	bool contains (const T *obj) const
		601	{
		602	return obj->*indexmember;
		603	}
		604
		605	iterator find (const T *obj)
		606	{
		607	return obj->*indexmember
		608	? this->begin () + obj->*indexmember - 1
		609	: this->end ();
		610	}
		611
		612	void push_back (T *obj)
		613	{
		614	std::vector<T , slice_allocator<T > >::push_back (obj);
		615	obj->*indexmember = this->size ();
		616	}
		617
406	void insert (T *obj)	618	void insert (T *obj)
407	{	619	{
408	assert (!(obj->*index));
409	push_back (obj);	620	push_back (obj);
410	obj->*index = this->size ();
411	}	621	}
412		622
413	void insert (T &obj)	623	void insert (T &obj)
414	{	624	{
415	insert (&obj);	625	insert (&obj);
416	}	626	}
417		627
418	void erase (T *obj)	628	void erase (T *obj)
419	{	629	{
420	assert (obj->*index);
421	unsigned int pos = obj->*index;	630	unsigned int pos = obj->*indexmember;
422	obj->*index = 0;	631	obj->*indexmember = 0;
423		632
424	if (pos < this->size ())	633	if (pos < this->size ())
425	{	634	{
426	(this)[pos - 1] = (this)[this->size () - 1];	635	(this)[pos - 1] = (this)[this->size () - 1];
427	(this)[pos - 1]->index = pos;	636	(this)[pos - 1]->indexmember = pos;
428	}	637	}
429		638
430	this->pop_back ();	639	this->pop_back ();
431	}	640	}
432		641
433	void erase (T &obj)	642	void erase (T &obj)
434	{	643	{
435	errase (&obj);	644	erase (&obj);
436	}	645	}
437	};	646	};
		647
		648	/////////////////////////////////////////////////////////////////////////////
		649
		650	// something like a vector or stack, but without
		651	// out of bounds checking
		652	template<typename T>
		653	struct fixed_stack
		654	{
		655	T *data;
		656	int size;
		657	int max;
		658
		659	fixed_stack ()
		660	: size (0), data (0)
		661	{
		662	}
		663
		664	fixed_stack (int max)
		665	: size (0), max (max)
		666	{
		667	data = salloc<T> (max);
		668	}
		669
		670	void reset (int new_max)
		671	{
		672	sfree (data, max);
		673	size = 0;
		674	max = new_max;
		675	data = salloc<T> (max);
		676	}
		677
		678	void free ()
		679	{
		680	sfree (data, max);
		681	data = 0;
		682	}
		683
		684	~fixed_stack ()
		685	{
		686	sfree (data, max);
		687	}
		688
		689	T &operator[](int idx)
		690	{
		691	return data [idx];
		692	}
		693
		694	void push (T v)
		695	{
		696	data [size++] = v;
		697	}
		698
		699	T &pop ()
		700	{
		701	return data [--size];
		702	}
		703
		704	T remove (int idx)
		705	{
		706	T v = data [idx];
		707
		708	data [idx] = data [--size];
		709
		710	return v;
		711	}
		712	};
		713
		714	/////////////////////////////////////////////////////////////////////////////
438		715
439	// basically does what strncpy should do, but appends "..." to strings exceeding length	716	// basically does what strncpy should do, but appends "..." to strings exceeding length
		717	// returns the number of bytes actually used (including \0)
440	void assign (char dst, const char src, int maxlen);	718	int assign (char dst, const char src, int maxsize);
441		719
442	// type-safe version of assign	720	// type-safe version of assign
443	template<int N>	721	template<int N>
444	inline void assign (char (&dst)[N], const char *src)	722	inline int assign (char (&dst)[N], const char *src)
445	{	723	{
446	assign ((char *)&dst, src, N);	724	return assign ((char *)&dst, src, N);
447	}	725	}
448		726
449	typedef double tstamp;	727	typedef double tstamp;
450		728
451	// return current time as timestampe	729	// return current time as timestamp
452	tstamp now ();	730	tstamp now ();
453		731
454	int similar_direction (int a, int b);	732	int similar_direction (int a, int b);
455		733
456	// like printf, but returns a std::string	734	// like v?sprintf, but returns a "static" buffer
457	const std::string format (const char *format, ...);	735	char vformat (const char format, va_list ap);
		736	char format (const char format, ...) attribute ((format (printf, 1, 2)));
458		737
		738	// safety-check player input which will become object->msg
		739	bool msg_is_safe (const char *msg);
		740
		741	/////////////////////////////////////////////////////////////////////////////
		742	// threads, very very thin wrappers around pthreads
		743
		744	struct thread
		745	{
		746	pthread_t id;
		747
		748	void start (void (start_routine)(void ), void arg = 0);
		749
		750	void cancel ()
		751	{
		752	pthread_cancel (id);
		753	}
		754
		755	void *join ()
		756	{
		757	void *ret;
		758
		759	if (pthread_join (id, &ret))
		760	cleanup ("pthread_join failed", 1);
		761
		762	return ret;
		763	}
		764	};
		765
		766	// note that mutexes are not classes
		767	typedef pthread_mutex_t smutex;
		768
		769	#if __linux && defined (PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP)
		770	#define SMUTEX_INITIALISER PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP
		771	#else
		772	#define SMUTEX_INITIALISER PTHREAD_MUTEX_INITIALIZER
459	#endif	773	#endif
460		774
		775	#define SMUTEX(name) smutex name = SMUTEX_INITIALISER
		776	#define SMUTEX_LOCK(name) pthread_mutex_lock (&(name))
		777	#define SMUTEX_UNLOCK(name) pthread_mutex_unlock (&(name))
		778
		779	typedef pthread_cond_t scond;
		780
		781	#define SCOND(name) scond name = PTHREAD_COND_INITIALIZER
		782	#define SCOND_SIGNAL(name) pthread_cond_signal (&(name))
		783	#define SCOND_BROADCAST(name) pthread_cond_broadcast (&(name))
		784	#define SCOND_WAIT(name,mutex) pthread_cond_wait (&(name), &(mutex))
		785
		786	#endif
		787

Diff Legend

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

Comparing deliantra/server/include/util.h (file contents): Revision 1.45 by root, Sat May 26 15:44:05 2007 UTC vs. Revision 1.114 by root, Sat Apr 23 04:56:51 2011 UTC

Diff Legend

Comparing deliantra/server/include/util.h (file contents):
Revision 1.45 by root, Sat May 26 15:44:05 2007 UTC vs.
Revision 1.114 by root, Sat Apr 23 04:56:51 2011 UTC