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

Comparing deliantra/server/include/util.h (file contents):
Revision 1.10 by root, Tue Sep 12 19:20:08 2006 UTC vs.
Revision 1.118 by root, Tue Jan 3 11:25:33 2012 UTC

…		…
		1	/*
		2	* This file is part of Deliantra, the Roguelike Realtime MMORPG.
		3	*
		4	* Copyright (©) 2005,2006,2007,2008,2009,2010,2011,2012 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
		28	#define DEBUG_POISON 0x00 // poison memory before freeing it if != 0
		29	#define DEBUG_SALLOC 0 // add a debug wrapper around all sallocs
		30	#define PREFER_MALLOC 0 // use malloc and not the slice allocator
		31
		32	#include <pthread.h>
		33
		34	#include <cstddef>
		35	#include <cmath>
		36	#include <new>
		37	#include <vector>
		38
		39	#include <glib.h>
		40
		41	#include <shstr.h>
		42	#include <traits.h>
		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
		57	// use C0X decltype for auto declarations until ISO C++ sanctifies them (if ever)
		58	#define auto(var,expr) decltype(expr) var = (expr)
		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	}
6	#else	67	#else
7	# define is_constant(c) 0	68	#define array_length(name) (sizeof (name) / sizeof (name [0]))
8	#endif	69	#endif
		70
		71	// very ugly macro that basically declares and initialises a variable
		72	// that is in scope for the next statement only
		73	// works only for stuff that can be assigned 0 and converts to false
		74	// (note: works great for pointers)
		75	// most ugly macro I ever wrote
		76	#define statementvar(type, name, value) if (type name = 0) { } else if (((name) = (value)), 1)
		77
		78	// in range including end
		79	#define IN_RANGE_INC(val,beg,end) \
		80	((unsigned int)(val) - (unsigned int)(beg) <= (unsigned int)(end) - (unsigned int)(beg))
		81
		82	// in range excluding end
		83	#define IN_RANGE_EXC(val,beg,end) \
		84	((unsigned int)(val) - (unsigned int)(beg) < (unsigned int)(end) - (unsigned int)(beg))
		85
		86	void cleanup (const char *cause, bool make_core = false);
		87	void fork_abort (const char *msg);
		88
		89	// rationale for using (U) not (T) is to reduce signed/unsigned issues,
		90	// as a is often a constant while b is the variable. it is still a bug, though.
		91	template<typename T, typename U> static inline T min (T a, U b) { return a < (T)b ? a : (T)b; }
		92	template<typename T, typename U> static inline T max (T a, U b) { return a > (T)b ? a : (T)b; }
		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; }
		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
		99	template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; }
		100
		101	template<typename T, typename U, typename V> static inline T min (T a, U b, V c) { return min (a, min (b, c)); }
		102	template<typename T, typename U, typename V> static inline T max (T a, U b, V c) { return max (a, max (b, c)); }
		103
		104	// sign returns -1 or +1
		105	template<typename T>
		106	static inline T sign (T v) { return v < 0 ? -1 : +1; }
		107	// relies on 2c representation
		108	template<>
		109	inline sint8 sign (sint8 v) { return 1 - (sint8 (uint8 (v) >> 7) * 2); }
		110	template<>
		111	inline sint16 sign (sint16 v) { return 1 - (sint16 (uint16 (v) >> 15) * 2); }
		112	template<>
		113	inline sint32 sign (sint32 v) { return 1 - (sint32 (uint32 (v) >> 31) * 2); }
		114
		115	// sign0 returns -1, 0 or +1
		116	template<typename T>
		117	static inline T sign0 (T v) { return v ? sign (v) : 0; }
		118
		119	//clashes with C++0x
		120	template<typename T, typename U>
		121	static inline T copysign (T a, U b) { return a > 0 ? b : -b; }
		122
		123	// div* only work correctly for div > 0
		124	// div, with correct rounding (< 0.5 downwards, >=0.5 upwards)
		125	template<typename T> static inline T div (T val, T div)
		126	{
		127	return expect_false (val < 0) ? - ((-val + (div - 1) / 2) / div) : (val + div / 2) / div;
		128	}
		129
		130	template<> inline float div (float val, float div) { return val / div; }
		131	template<> inline double div (double val, double div) { return val / div; }
		132
		133	// div, round-up
		134	template<typename T> static inline T div_ru (T val, T div)
		135	{
		136	return expect_false (val < 0) ? - ((-val ) / div) : (val + div - 1) / div;
		137	}
		138	// div, round-down
		139	template<typename T> static inline T div_rd (T val, T div)
		140	{
		141	return expect_false (val < 0) ? - ((-val + (div - 1) ) / div) : (val ) / div;
		142	}
		143
		144	// lerp* only work correctly for min_in < max_in
		145	// Linear intERPolate, scales val from min_in..max_in to min_out..max_out
		146	template<typename T>
		147	static inline T
		148	lerp (T val, T min_in, T max_in, T min_out, T max_out)
		149	{
		150	return min_out + div <T> ((val - min_in) * (max_out - min_out), max_in - min_in);
		151	}
		152
		153	// lerp, round-down
		154	template<typename T>
		155	static inline T
		156	lerp_rd (T val, T min_in, T max_in, T min_out, T max_out)
		157	{
		158	return min_out + div_rd<T> ((val - min_in) * (max_out - min_out), max_in - min_in);
		159	}
		160
		161	// lerp, round-up
		162	template<typename T>
		163	static inline T
		164	lerp_ru (T val, T min_in, T max_in, T min_out, T max_out)
		165	{
		166	return min_out + div_ru<T> ((val - min_in) * (max_out - min_out), max_in - min_in);
		167	}
		168
		169	// lots of stuff taken from FXT
		170
		171	/* Rotate right. This is used in various places for checksumming */
		172	//TODO: that sucks, use a better checksum algo
		173	static inline uint32_t
		174	rotate_right (uint32_t c, uint32_t count = 1)
		175	{
		176	return (c << (32 - count)) \| (c >> count);
		177	}
		178
		179	static inline uint32_t
		180	rotate_left (uint32_t c, uint32_t count = 1)
		181	{
		182	return (c >> (32 - count)) \| (c << count);
		183	}
		184
		185	// Return abs(a-b)
		186	// Both a and b must not have the most significant bit set
		187	static inline uint32_t
		188	upos_abs_diff (uint32_t a, uint32_t b)
		189	{
		190	long d1 = b - a;
		191	long d2 = (d1 & (d1 >> 31)) << 1;
		192
		193	return d1 - d2; // == (b - d) - (a + d);
		194	}
		195
		196	// Both a and b must not have the most significant bit set
		197	static inline uint32_t
		198	upos_min (uint32_t a, uint32_t b)
		199	{
		200	int32_t d = b - a;
		201	d &= d >> 31;
		202	return a + d;
		203	}
		204
		205	// Both a and b must not have the most significant bit set
		206	static inline uint32_t
		207	upos_max (uint32_t a, uint32_t b)
		208	{
		209	int32_t d = b - a;
		210	d &= d >> 31;
		211	return b - d;
		212	}
		213
		214	// this is much faster than crossfire's original algorithm
		215	// on modern cpus
		216	inline int
		217	isqrt (int n)
		218	{
		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;
		234	}
		235
		236	// this is only twice as fast as naive sqrtf (dxdy+dydy)
		237	#if 0
		238	// and has a max. error of 6 in the range -100..+100.
		239	#else
		240	// and has a max. error of 9 in the range -100..+100.
		241	#endif
		242	inline int
		243	idistance (int dx, int dy)
		244	{
		245	unsigned int dx_ = abs (dx);
		246	unsigned int dy_ = abs (dy);
		247
		248	#if 0
		249	return dx_ > dy_
		250	? (dx_ * 61685 + dy_ * 26870) >> 16
		251	: (dy_ * 61685 + dx_ * 26870) >> 16;
		252	#else
		253	return dx_ + dy_ - min (dx_, dy_) * 5 / 8;
		254	#endif
		255	}
		256
		257	// can be substantially faster than floor, if your value range allows for it
		258	template<typename T>
		259	inline T
		260	fastfloor (T x)
		261	{
		262	return std::floor (x);
		263	}
		264
		265	inline float
		266	fastfloor (float x)
		267	{
		268	return sint32(x) - (x < 0);
		269	}
		270
		271	inline double
		272	fastfloor (double x)
		273	{
		274	return sint64(x) - (x < 0);
		275	}
		276
		277	/*
		278	* absdir(int): Returns a number between 1 and 8, which represent
		279	* the "absolute" direction of a number (it actually takes care of
		280	* "overflow" in previous calculations of a direction).
		281	*/
		282	inline int
		283	absdir (int d)
		284	{
		285	return ((d - 1) & 7) + 1;
		286	}
		287
		288	// avoid ctz name because netbsd or freebsd spams it's namespace with it
		289	#if GCC_VERSION(3,4)
		290	static inline int least_significant_bit (uint32_t x)
		291	{
		292	return __builtin_ctz (x);
		293	}
		294	#else
		295	int least_significant_bit (uint32_t x);
		296	#endif
		297
		298	#define for_all_bits_sparse_32(mask, idxvar) \
		299	for (uint32_t idxvar, mask_ = mask; \
		300	mask_ && ((idxvar = least_significant_bit (mask_)), mask_ &= ~(1 << idxvar), 1);)
		301
		302	extern ssize_t slice_alloc; // statistics
		303
		304	void *salloc_ (int n) throw (std::bad_alloc);
		305	void salloc_ (int n, void src) throw (std::bad_alloc);
		306
		307	// strictly the same as g_slice_alloc, but never returns 0
		308	template<typename T>
		309	inline T salloc (int n = 1) throw (std::bad_alloc) { return (T )salloc_ (n * sizeof (T)); }
		310
		311	// also copies src into the new area, like "memdup"
		312	// if src is 0, clears the memory
		313	template<typename T>
		314	inline T salloc (int n, T src) throw (std::bad_alloc) { return (T )salloc_ (n sizeof (T), (void *)src); }
		315
		316	// clears the memory
		317	template<typename T>
		318	inline T salloc0(int n = 1) throw (std::bad_alloc) { return (T )salloc_ (n * sizeof (T), 0); }
		319
		320	// for symmetry
		321	template<typename T>
		322	inline void sfree (T *ptr, int n = 1) throw ()
		323	{
		324	if (expect_true (ptr))
		325	{
		326	slice_alloc -= n * sizeof (T);
		327	if (DEBUG_POISON) memset (ptr, DEBUG_POISON, n * sizeof (T));
		328	g_slice_free1 (n * sizeof (T), (void *)ptr);
		329	}
		330	}
		331
		332	// nulls the pointer
		333	template<typename T>
		334	inline void sfree0 (T *&ptr, int n = 1) throw ()
		335	{
		336	sfree<T> (ptr, n);
		337	ptr = 0;
		338	}
9		339
10	// makes dynamically allocated objects zero-initialised	340	// makes dynamically allocated objects zero-initialised
11	struct zero_initialised	341	struct zero_initialised
12	{	342	{
13	void operator new (size_t s, void );	343	void operator new (size_t s, void p)
		344	{
		345	memset (p, 0, s);
		346	return p;
		347	}
		348
14	void *operator new (size_t s);	349	void *operator new (size_t s)
		350	{
		351	return salloc0<char> (s);
		352	}
		353
15	void *operator new [] (size_t s);	354	void *operator new[] (size_t s)
		355	{
		356	return salloc0<char> (s);
		357	}
		358
16	void operator delete (void *p, size_t s);	359	void operator delete (void *p, size_t s)
		360	{
		361	sfree ((char *)p, s);
		362	}
		363
17	void operator delete [] (void *p, size_t s);	364	void operator delete[] (void *p, size_t s)
		365	{
		366	sfree ((char *)p, s);
		367	}
18	};	368	};
19		369
		370	// makes dynamically allocated objects zero-initialised
		371	struct slice_allocated
		372	{
		373	void operator new (size_t s, void p)
		374	{
		375	return p;
		376	}
		377
		378	void *operator new (size_t s)
		379	{
		380	return salloc<char> (s);
		381	}
		382
		383	void *operator new[] (size_t s)
		384	{
		385	return salloc<char> (s);
		386	}
		387
		388	void operator delete (void *p, size_t s)
		389	{
		390	sfree ((char *)p, s);
		391	}
		392
		393	void operator delete[] (void *p, size_t s)
		394	{
		395	sfree ((char *)p, s);
		396	}
		397	};
		398
		399	// a STL-compatible allocator that uses g_slice
		400	// boy, this is verbose
		401	template<typename Tp>
		402	struct slice_allocator
		403	{
		404	typedef size_t size_type;
		405	typedef ptrdiff_t difference_type;
		406	typedef Tp *pointer;
		407	typedef const Tp *const_pointer;
		408	typedef Tp &reference;
		409	typedef const Tp &const_reference;
		410	typedef Tp value_type;
		411
		412	template <class U>
		413	struct rebind
		414	{
		415	typedef slice_allocator<U> other;
		416	};
		417
		418	slice_allocator () throw () { }
		419	slice_allocator (const slice_allocator &) throw () { }
		420	template<typename Tp2>
		421	slice_allocator (const slice_allocator<Tp2> &) throw () { }
		422
		423	~slice_allocator () { }
		424
		425	pointer address (reference x) const { return &x; }
		426	const_pointer address (const_reference x) const { return &x; }
		427
		428	pointer allocate (size_type n, const_pointer = 0)
		429	{
		430	return salloc<Tp> (n);
		431	}
		432
		433	void deallocate (pointer p, size_type n)
		434	{
		435	sfree<Tp> (p, n);
		436	}
		437
		438	size_type max_size () const throw ()
		439	{
		440	return size_t (-1) / sizeof (Tp);
		441	}
		442
		443	void construct (pointer p, const Tp &val)
		444	{
		445	::new (p) Tp (val);
		446	}
		447
		448	void destroy (pointer p)
		449	{
		450	p->~Tp ();
		451	}
		452	};
		453
		454	// basically a memory area, but refcounted
		455	struct refcnt_buf
		456	{
		457	char *data;
		458
		459	refcnt_buf (size_t size = 0);
		460	refcnt_buf (void *data, size_t size);
		461
		462	refcnt_buf (const refcnt_buf &src)
		463	{
		464	data = src.data;
		465	++_refcnt ();
		466	}
		467
		468	~refcnt_buf ();
		469
		470	refcnt_buf &operator =(const refcnt_buf &src);
		471
		472	operator char *()
		473	{
		474	return data;
		475	}
		476
		477	size_t size () const
		478	{
		479	return _size ();
		480	}
		481
		482	protected:
		483	enum {
		484	overhead = sizeof (unsigned int) * 2
		485	};
		486
		487	unsigned int &_size () const
		488	{
		489	return ((unsigned int *)data)[-2];
		490	}
		491
		492	unsigned int &_refcnt () const
		493	{
		494	return ((unsigned int *)data)[-1];
		495	}
		496
		497	void _alloc (unsigned int size)
		498	{
		499	data = ((char *)salloc<char> (size + overhead)) + overhead;
		500	_size () = size;
		501	_refcnt () = 1;
		502	}
		503
		504	void dec ()
		505	{
		506	if (!--_refcnt ())
		507	sfree<char> (data - overhead, size () + overhead);
		508	}
		509	};
		510
		511	INTERFACE_CLASS (attachable)
20	struct refcounted	512	struct refcnt_base
21	{	513	{
22	mutable int refcnt;	514	typedef int refcnt_t;
23	refcounted () : refcnt (0) { }	515	mutable refcnt_t ACC (RW, refcnt);
		516
24	void refcnt_inc () { ++refcnt; }	517	MTH void refcnt_inc () const { ++refcnt; }
25	void refcnt_dec () { --refcnt;	518	MTH void refcnt_dec () const { --refcnt; }
26	if (refcnt < 0)abort();}//D	519
		520	refcnt_base () : refcnt (0) { }
27	};	521	};
		522
		523	// to avoid branches with more advanced compilers
		524	extern refcnt_base::refcnt_t refcnt_dummy;
28		525
29	template<class T>	526	template<class T>
30	struct refptr	527	struct refptr
31	{	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
32	T *p;	548	T *p;
33		549
34	refptr () : p(0) { }	550	refptr () : p(0) { }
35	refptr (const refptr<T> &p) : p(p.p) { if (p) p->refcnt_inc (); }	551	refptr (const refptr<T> &p) : p(p.p) { refcnt_inc (); }
36	refptr (T *p) : p(p) { if (p) p->refcnt_inc (); }	552	refptr (T *p) : p(p) { refcnt_inc (); }
37	~refptr () { if (p) p->refcnt_dec (); }	553	~refptr () { refcnt_dec (); }
38		554
39	const refptr<T> &operator =(T *o)	555	const refptr<T> &operator =(T *o)
40	{	556	{
		557	// if decrementing ever destroys we need to reverse the order here
41	if (p) p->refcnt_dec ();	558	refcnt_dec ();
42	p = o;	559	p = o;
43	if (p) p->refcnt_inc ();	560	refcnt_inc ();
44
45	return *this;	561	return *this;
46	}	562	}
47		563
48	const refptr<T> &operator =(const refptr<T> o)	564	const refptr<T> &operator =(const refptr<T> &o)
49	{	565	{
50	*this = o.p;	566	*this = o.p;
51	return *this;	567	return *this;
52	}	568	}
53		569
54	T &operator * () const { return *p; }	570	T &operator * () const { return *p; }
55	T *operator ->() const { return p; }	571	T *operator ->() const { return p; }
56		572
57	operator T *() const { return p; }	573	operator T *() const { return p; }
58	};	574	};
59		575
		576	typedef refptr<maptile> maptile_ptr;
		577	typedef refptr<object> object_ptr;
		578	typedef refptr<archetype> arch_ptr;
		579	typedef refptr<client> client_ptr;
		580	typedef refptr<player> player_ptr;
		581	typedef refptr<region> region_ptr;
		582
		583	#define STRHSH_NULL 2166136261
		584
		585	static inline uint32_t
		586	strhsh (const char *s)
		587	{
		588	// use FNV-1a hash (http://isthe.com/chongo/tech/comp/fnv/)
		589	// it is about twice as fast as the one-at-a-time one,
		590	// with good distribution.
		591	// FNV-1a is faster on many cpus because the multiplication
		592	// runs concurrently with the looping logic.
		593	// we modify the hash a bit to improve its distribution
		594	uint32_t hash = STRHSH_NULL;
		595
		596	while (*s)
		597	hash = (hash ^ s++) 16777619U;
		598
		599	return hash ^ (hash >> 16);
		600	}
		601
		602	static inline uint32_t
		603	memhsh (const char *s, size_t len)
		604	{
		605	uint32_t hash = STRHSH_NULL;
		606
		607	while (len--)
		608	hash = (hash ^ s++) 16777619U;
		609
		610	return hash;
		611	}
		612
60	struct str_hash	613	struct str_hash
61	{	614	{
62	std::size_t operator ()(const char *s) const	615	std::size_t operator ()(const char *s) const
63	{	616	{
64	unsigned long hash = 0;
65
66	/* use the one-at-a-time hash function, which supposedly is
67	* better than the djb2-like one used by perl5.005, but
68	* certainly is better then the bug used here before.
69	* see http://burtleburtle.net/bob/hash/doobs.html
70	*/
71	while (*s)
72	{
73	hash += *s++;
74	hash += hash << 10;
75	hash ^= hash >> 6;
76	}
77
78	hash += hash << 3;
79	hash ^= hash >> 11;
80	hash += hash << 15;
81
82	return hash;	617	return strhsh (s);
		618	}
		619
		620	std::size_t operator ()(const shstr &s) const
		621	{
		622	return strhsh (s);
83	}	623	}
84	};	624	};
85		625
86	struct str_equal	626	struct str_equal
87	{	627	{
89	{	629	{
90	return !strcmp (a, b);	630	return !strcmp (a, b);
91	}	631	}
92	};	632	};
93		633
94	#include <vector>	634	// Mostly the same as std::vector, but insert/erase can reorder
95		635	// the elements, making append(=insert)/remove O(1) instead of O(n).
		636	//
		637	// NOTE: only some forms of erase are available
96	template<class obj>	638	template<class T>
97	struct unordered_vector : std::vector<obj>	639	struct unordered_vector : std::vector<T, slice_allocator<T> >
98	{	640	{
99	typedef typename std::vector<obj>::iterator iterator;	641	typedef typename unordered_vector::iterator iterator;
100		642
101	void erase (unsigned int pos)	643	void erase (unsigned int pos)
102	{	644	{
103	if (pos < this->size () - 1)	645	if (pos < this->size () - 1)
104	(this)[pos] = (this)[this->size () - 1];	646	(this)[pos] = (this)[this->size () - 1];
…		…
110	{	652	{
111	erase ((unsigned int )(i - this->begin ()));	653	erase ((unsigned int )(i - this->begin ()));
112	}	654	}
113	};	655	};
114		656
115	template<typename T, typename U> static inline T min (T a, U b) { return a < (T)b ? a : (T)b; }	657	// This container blends advantages of linked lists
116	template<typename T, typename U> static inline T max (T a, U b) { return a > (T)b ? a : (T)b; }	658	// (efficiency) with vectors (random access) by
117	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; }	659	// by using an unordered vector and storing the vector
		660	// index inside the object.
		661	//
		662	// + memory-efficient on most 64 bit archs
		663	// + O(1) insert/remove
		664	// + free unique (but varying) id for inserted objects
		665	// + cache-friendly iteration
		666	// - only works for pointers to structs
		667	//
		668	// NOTE: only some forms of erase/insert are available
		669	typedef int object_vector_index;
118		670
119	template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; }	671	template<class T, object_vector_index T::*indexmember>
		672	struct object_vector : std::vector<T , slice_allocator<T > >
		673	{
		674	typedef typename object_vector::iterator iterator;
		675
		676	bool contains (const T *obj) const
		677	{
		678	return obj->*indexmember;
		679	}
		680
		681	iterator find (const T *obj)
		682	{
		683	return obj->*indexmember
		684	? this->begin () + obj->*indexmember - 1
		685	: this->end ();
		686	}
		687
		688	void push_back (T *obj)
		689	{
		690	std::vector<T , slice_allocator<T > >::push_back (obj);
		691	obj->*indexmember = this->size ();
		692	}
		693
		694	void insert (T *obj)
		695	{
		696	push_back (obj);
		697	}
		698
		699	void insert (T &obj)
		700	{
		701	insert (&obj);
		702	}
		703
		704	void erase (T *obj)
		705	{
		706	unsigned int pos = obj->*indexmember;
		707	obj->*indexmember = 0;
		708
		709	if (pos < this->size ())
		710	{
		711	(this)[pos - 1] = (this)[this->size () - 1];
		712	(this)[pos - 1]->indexmember = pos;
		713	}
		714
		715	this->pop_back ();
		716	}
		717
		718	void erase (T &obj)
		719	{
		720	erase (&obj);
		721	}
		722	};
		723
		724	/////////////////////////////////////////////////////////////////////////////
		725
		726	// something like a vector or stack, but without
		727	// out of bounds checking
		728	template<typename T>
		729	struct fixed_stack
		730	{
		731	T *data;
		732	int size;
		733	int max;
		734
		735	fixed_stack ()
		736	: size (0), data (0)
		737	{
		738	}
		739
		740	fixed_stack (int max)
		741	: size (0), max (max)
		742	{
		743	data = salloc<T> (max);
		744	}
		745
		746	void reset (int new_max)
		747	{
		748	sfree (data, max);
		749	size = 0;
		750	max = new_max;
		751	data = salloc<T> (max);
		752	}
		753
		754	void free ()
		755	{
		756	sfree (data, max);
		757	data = 0;
		758	}
		759
		760	~fixed_stack ()
		761	{
		762	sfree (data, max);
		763	}
		764
		765	T &operator[](int idx)
		766	{
		767	return data [idx];
		768	}
		769
		770	void push (T v)
		771	{
		772	data [size++] = v;
		773	}
		774
		775	T &pop ()
		776	{
		777	return data [--size];
		778	}
		779
		780	T remove (int idx)
		781	{
		782	T v = data [idx];
		783
		784	data [idx] = data [--size];
		785
		786	return v;
		787	}
		788	};
		789
		790	/////////////////////////////////////////////////////////////////////////////
120		791
121	// basically does what strncpy should do, but appends "..." to strings exceeding length	792	// basically does what strncpy should do, but appends "..." to strings exceeding length
		793	// returns the number of bytes actually used (including \0)
122	void assign (char dst, const char src, int maxlen);	794	int assign (char dst, const char src, int maxsize);
123		795
124	// type-safe version of assign	796	// type-safe version of assign
125	template<int N>	797	template<int N>
126	inline void assign (char (&dst)[N], const char *src)	798	inline int assign (char (&dst)[N], const char *src)
127	{	799	{
128	assign ((char *)&dst, src, N);	800	return assign ((char *)&dst, src, N);
129	}	801	}
130		802
		803	typedef double tstamp;
		804
		805	// return current time as timestamp
		806	tstamp now ();
		807
		808	int similar_direction (int a, int b);
		809
		810	// like v?sprintf, but returns a "static" buffer
		811	char vformat (const char format, va_list ap);
		812	char format (const char format, ...) attribute ((format (printf, 1, 2)));
		813
		814	// safety-check player input which will become object->msg
		815	bool msg_is_safe (const char *msg);
		816
		817	/////////////////////////////////////////////////////////////////////////////
		818	// threads, very very thin wrappers around pthreads
		819
		820	struct thread
		821	{
		822	pthread_t id;
		823
		824	void start (void (start_routine)(void ), void arg = 0);
		825
		826	void cancel ()
		827	{
		828	pthread_cancel (id);
		829	}
		830
		831	void *join ()
		832	{
		833	void *ret;
		834
		835	if (pthread_join (id, &ret))
		836	cleanup ("pthread_join failed", 1);
		837
		838	return ret;
		839	}
		840	};
		841
		842	// note that mutexes are not classes
		843	typedef pthread_mutex_t smutex;
		844
		845	#if __linux && defined (PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP)
		846	#define SMUTEX_INITIALISER PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP
		847	#else
		848	#define SMUTEX_INITIALISER PTHREAD_MUTEX_INITIALIZER
131	#endif	849	#endif
132		850
		851	#define SMUTEX(name) smutex name = SMUTEX_INITIALISER
		852	#define SMUTEX_LOCK(name) pthread_mutex_lock (&(name))
		853	#define SMUTEX_UNLOCK(name) pthread_mutex_unlock (&(name))
		854
		855	typedef pthread_cond_t scond;
		856
		857	#define SCOND(name) scond name = PTHREAD_COND_INITIALIZER
		858	#define SCOND_SIGNAL(name) pthread_cond_signal (&(name))
		859	#define SCOND_BROADCAST(name) pthread_cond_broadcast (&(name))
		860	#define SCOND_WAIT(name,mutex) pthread_cond_wait (&(name), &(mutex))
		861
		862	#endif
		863

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Comparing deliantra/server/include/util.h (file contents): Revision 1.10 by root, Tue Sep 12 19:20:08 2006 UTC vs. Revision 1.118 by root, Tue Jan 3 11:25:33 2012 UTC

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Comparing deliantra/server/include/util.h (file contents):
Revision 1.10 by root, Tue Sep 12 19:20:08 2006 UTC vs.
Revision 1.118 by root, Tue Jan 3 11:25:33 2012 UTC