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

Comparing deliantra/server/include/util.h (file contents):
Revision 1.11 by root, Tue Sep 12 20:55:40 2006 UTC vs.
Revision 1.125 by root, Wed Nov 14 22:52:13 2018 UTC

…		…
		1	/*
		2	* This file is part of Deliantra, the Roguelike Realtime MMORPG.
		3	*
		4	* Copyright (©) 2005,2006,2007,2008,2009,2010,2011,2012,2013,2014,2015,2016 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 /* still sucks in codesize with gcc 6, although local types work now */
		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
9		70
10	#include <cstddef>	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)
11		77
12	#include <glib.h>	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);
		305	void salloc_ (int n, void src);
		306
		307	// strictly the same as g_slice_alloc, but never returns 0
		308	template<typename T>
		309	inline T salloc (int n = 1) { 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) { return (T )salloc_ (n sizeof (T), (void *)src); }
		315
		316	// clears the memory
		317	template<typename T>
		318	inline T salloc0(int n = 1) { return (T )salloc_ (n * sizeof (T), 0); }
		319
		320	// for symmetry
		321	template<typename T>
		322	inline void sfree (T *ptr, int n = 1) noexcept
		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) noexcept
		335	{
		336	sfree<T> (ptr, n);
		337	ptr = 0;
		338	}
13		339
14	// makes dynamically allocated objects zero-initialised	340	// makes dynamically allocated objects zero-initialised
15	struct zero_initialised	341	struct zero_initialised
16	{	342	{
17	void operator new (size_t s, void p)	343	void operator new (size_t s, void p)
20	return p;	346	return p;
21	}	347	}
22		348
23	void *operator new (size_t s)	349	void *operator new (size_t s)
24	{	350	{
25	return g_slice_alloc0 (s);	351	return salloc0<char> (s);
26	}	352	}
27		353
28	void *operator new[] (size_t s)	354	void *operator new[] (size_t s)
29	{	355	{
30	return g_slice_alloc0 (s);	356	return salloc0<char> (s);
31	}	357	}
32		358
33	void operator delete (void *p, size_t s)	359	void operator delete (void *p, size_t s)
34	{	360	{
35	g_slice_free1 (s, p);	361	sfree ((char *)p, s);
36	}	362	}
37		363
38	void operator delete[] (void *p, size_t s)	364	void operator delete[] (void *p, size_t s)
39	{	365	{
40	g_slice_free1 (s, p);	366	sfree ((char *)p, s);
41	}	367	}
42	};	368	};
43		369
44	void throw_bad_alloc () throw (std::bad_alloc);	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	}
45		377
46	void *alloc (int s) throw (std::bad_alloc);	378	void *operator new (size_t s)
47	void dealloc (void *p, int s) throw ();	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	};
48		398
49	// a STL-compatible allocator that uses g_slice	399	// a STL-compatible allocator that uses g_slice
50	// boy, this is verbose	400	// boy, this is verbose
51	template<typename Tp>	401	template<typename Tp>
52	struct slice_allocator	402	struct slice_allocator
…		…
57	typedef const Tp *const_pointer;	407	typedef const Tp *const_pointer;
58	typedef Tp &reference;	408	typedef Tp &reference;
59	typedef const Tp &const_reference;	409	typedef const Tp &const_reference;
60	typedef Tp value_type;	410	typedef Tp value_type;
61		411
62	template <class U>	412	template <class U>
63	struct rebind	413	struct rebind
64	{	414	{
65	typedef slice_allocator<U> other;	415	typedef slice_allocator<U> other;
66	};	416	};
67		417
68	slice_allocator () throw () { }	418	slice_allocator () noexcept { }
69	slice_allocator (const slice_allocator &o) throw () { }	419	slice_allocator (const slice_allocator &) noexcept { }
70	template<typename Tp2>	420	template<typename Tp2>
71	slice_allocator (const slice_allocator<Tp2> &) throw () { }	421	slice_allocator (const slice_allocator<Tp2> &) noexcept { }
72		422
73	~slice_allocator () { }	423	~slice_allocator () { }
74		424
75	pointer address (reference x) const { return &x; }	425	pointer address (reference x) const { return &x; }
76	const_pointer address (const_reference x) const { return &x; }	426	const_pointer address (const_reference x) const { return &x; }
77		427
78	pointer allocate (size_type n, const_pointer = 0)	428	pointer allocate (size_type n, const_pointer = 0)
79	{	429	{
80	return static_cast<pointer>(alloc (n * sizeof (Tp)));	430	return salloc<Tp> (n);
81	}	431	}
82		432
83	void deallocate (pointer p, size_type n)	433	void deallocate (pointer p, size_type n)
84	{	434	{
85	dealloc (static_cast<void *>(p), n);	435	sfree<Tp> (p, n);
86	}	436	}
87		437
88	size_type max_size ()const throw ()	438	size_type max_size () const noexcept
89	{	439	{
90	return size_t (-1) / sizeof (Tp);	440	return size_t (-1) / sizeof (Tp);
91	}	441	}
92		442
93	void construct (pointer p, const Tp &val)	443	void construct (pointer p, const Tp &val)
…		…
99	{	449	{
100	p->~Tp ();	450	p->~Tp ();
101	}	451	}
102	};	452	};
103		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	inc ();
		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 (uint32_t) * 2
		485	};
		486
		487	uint32_t &_size () const
		488	{
		489	return ((unsigned int *)data)[-2];
		490	}
		491
		492	uint32_t &_refcnt () const
		493	{
		494	return ((unsigned int *)data)[-1];
		495	}
		496
		497	void _alloc (uint32_t size)
		498	{
		499	data = ((char *)salloc<char> (size + overhead)) + overhead;
		500	_size () = size;
		501	_refcnt () = 1;
		502	}
		503
		504	void _dealloc ();
		505
		506	void inc ()
		507	{
		508	++_refcnt ();
		509	}
		510
		511	void dec ()
		512	{
		513	if (!--_refcnt ())
		514	_dealloc ();
		515	}
		516	};
		517
		518	INTERFACE_CLASS (attachable)
104	struct refcounted	519	struct refcnt_base
105	{	520	{
106	mutable int refcnt;	521	typedef int refcnt_t;
107	refcounted () : refcnt (0) { }	522	mutable refcnt_t ACC (RW, refcnt);
		523
108	void refcnt_inc () { ++refcnt; }	524	MTH void refcnt_inc () const { ++refcnt; }
109	void refcnt_dec () { --refcnt;	525	MTH void refcnt_dec () const { --refcnt; }
110	if (refcnt < 0)abort();}//D	526
		527	refcnt_base () : refcnt (0) { }
111	};	528	};
		529
		530	// to avoid branches with more advanced compilers
		531	extern refcnt_base::refcnt_t refcnt_dummy;
112		532
113	template<class T>	533	template<class T>
114	struct refptr	534	struct refptr
115	{	535	{
		536	// p if not null
		537	refcnt_base::refcnt_t *refcnt_ref () { return p ? &p->refcnt : &refcnt_dummy; }
		538
		539	void refcnt_dec ()
		540	{
		541	if (!is_constant (p))
		542	--*refcnt_ref ();
		543	else if (p)
		544	--p->refcnt;
		545	}
		546
		547	void refcnt_inc ()
		548	{
		549	if (!is_constant (p))
		550	++*refcnt_ref ();
		551	else if (p)
		552	++p->refcnt;
		553	}
		554
116	T *p;	555	T *p;
117		556
118	refptr () : p(0) { }	557	refptr () : p(0) { }
119	refptr (const refptr<T> &p) : p(p.p) { if (p) p->refcnt_inc (); }	558	refptr (const refptr<T> &p) : p(p.p) { refcnt_inc (); }
120	refptr (T *p) : p(p) { if (p) p->refcnt_inc (); }	559	refptr (T *p) : p(p) { refcnt_inc (); }
121	~refptr () { if (p) p->refcnt_dec (); }	560	~refptr () { refcnt_dec (); }
122		561
123	const refptr<T> &operator =(T *o)	562	const refptr<T> &operator =(T *o)
124	{	563	{
		564	// if decrementing ever destroys we need to reverse the order here
125	if (p) p->refcnt_dec ();	565	refcnt_dec ();
126	p = o;	566	p = o;
127	if (p) p->refcnt_inc ();	567	refcnt_inc ();
128
129	return *this;	568	return *this;
130	}	569	}
131		570
132	const refptr<T> &operator =(const refptr<T> o)	571	const refptr<T> &operator =(const refptr<T> &o)
133	{	572	{
134	*this = o.p;	573	*this = o.p;
135	return *this;	574	return *this;
136	}	575	}
137		576
138	T &operator * () const { return *p; }	577	T &operator * () const { return *p; }
139	T *operator ->() const { return p; }	578	T *operator ->() const { return p; }
140		579
141	operator T *() const { return p; }	580	operator T *() const { return p; }
142	};	581	};
143		582
		583	typedef refptr<maptile> maptile_ptr;
		584	typedef refptr<object> object_ptr;
		585	typedef refptr<archetype> arch_ptr;
		586	typedef refptr<client> client_ptr;
		587	typedef refptr<player> player_ptr;
		588	typedef refptr<region> region_ptr;
		589
		590	#define STRHSH_NULL 2166136261
		591
		592	static inline uint32_t
		593	strhsh (const char *s)
		594	{
		595	// use FNV-1a hash (http://isthe.com/chongo/tech/comp/fnv/)
		596	// it is about twice as fast as the one-at-a-time one,
		597	// with good distribution.
		598	// FNV-1a is faster on many cpus because the multiplication
		599	// runs concurrently with the looping logic.
		600	// we modify the hash a bit to improve its distribution
		601	uint32_t hash = STRHSH_NULL;
		602
		603	while (*s)
		604	hash = (hash ^ s++) 16777619U;
		605
		606	return hash ^ (hash >> 16);
		607	}
		608
		609	static inline uint32_t
		610	memhsh (const char *s, size_t len)
		611	{
		612	uint32_t hash = STRHSH_NULL;
		613
		614	while (len--)
		615	hash = (hash ^ s++) 16777619U;
		616
		617	return hash;
		618	}
		619
144	struct str_hash	620	struct str_hash
145	{	621	{
146	std::size_t operator ()(const char *s) const	622	std::size_t operator ()(const char *s) const
147	{	623	{
148	unsigned long hash = 0;
149
150	/* use the one-at-a-time hash function, which supposedly is
151	* better than the djb2-like one used by perl5.005, but
152	* certainly is better then the bug used here before.
153	* see http://burtleburtle.net/bob/hash/doobs.html
154	*/
155	while (*s)
156	{
157	hash += *s++;
158	hash += hash << 10;
159	hash ^= hash >> 6;
160	}
161
162	hash += hash << 3;
163	hash ^= hash >> 11;
164	hash += hash << 15;
165
166	return hash;	624	return strhsh (s);
		625	}
		626
		627	std::size_t operator ()(const shstr &s) const
		628	{
		629	return strhsh (s);
167	}	630	}
168	};	631	};
169		632
170	struct str_equal	633	struct str_equal
171	{	634	{
…		…
173	{	636	{
174	return !strcmp (a, b);	637	return !strcmp (a, b);
175	}	638	}
176	};	639	};
177		640
178	#include <vector>	641	// Mostly the same as std::vector, but insert/erase can reorder
179		642	// the elements, making append(=insert)/remove O(1) instead of O(n).
		643	//
		644	// NOTE: only some forms of erase are available
180	template<class obj>	645	template<class T>
181	struct unordered_vector : std::vector<obj, slice_allocator<obj> >	646	struct unordered_vector : std::vector<T, slice_allocator<T> >
182	{	647	{
183	typedef typename unordered_vector::iterator iterator;	648	typedef typename unordered_vector::iterator iterator;
184		649
185	void erase (unsigned int pos)	650	void erase (unsigned int pos)
186	{	651	{
…		…
194	{	659	{
195	erase ((unsigned int )(i - this->begin ()));	660	erase ((unsigned int )(i - this->begin ()));
196	}	661	}
197	};	662	};
198		663
199	template<typename T, typename U> static inline T min (T a, U b) { return a < (T)b ? a : (T)b; }	664	// This container blends advantages of linked lists
200	template<typename T, typename U> static inline T max (T a, U b) { return a > (T)b ? a : (T)b; }	665	// (efficiency) with vectors (random access) by
201	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; }	666	// using an unordered vector and storing the vector
		667	// index inside the object.
		668	//
		669	// + memory-efficient on most 64 bit archs
		670	// + O(1) insert/remove
		671	// + free unique (but varying) id for inserted objects
		672	// + cache-friendly iteration
		673	// - only works for pointers to structs
		674	//
		675	// NOTE: only some forms of erase/insert are available
		676	typedef int object_vector_index;
202		677
203	template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; }	678	template<class T, object_vector_index T::*indexmember>
		679	struct object_vector : std::vector<T , slice_allocator<T > >
		680	{
		681	typedef typename object_vector::iterator iterator;
		682
		683	bool contains (const T *obj) const
		684	{
		685	return obj->*indexmember;
		686	}
		687
		688	iterator find (const T *obj)
		689	{
		690	return obj->*indexmember
		691	? this->begin () + obj->*indexmember - 1
		692	: this->end ();
		693	}
		694
		695	void push_back (T *obj)
		696	{
		697	std::vector<T , slice_allocator<T > >::push_back (obj);
		698	obj->*indexmember = this->size ();
		699	}
		700
		701	void insert (T *obj)
		702	{
		703	push_back (obj);
		704	}
		705
		706	void insert (T &obj)
		707	{
		708	insert (&obj);
		709	}
		710
		711	void erase (T *obj)
		712	{
		713	object_vector_index pos = obj->*indexmember;
		714	obj->*indexmember = 0;
		715
		716	if (pos < this->size ())
		717	{
		718	(this)[pos - 1] = (this)[this->size () - 1];
		719	(this)[pos - 1]->indexmember = pos;
		720	}
		721
		722	this->pop_back ();
		723	}
		724
		725	void erase (T &obj)
		726	{
		727	erase (&obj);
		728	}
		729	};
		730
		731	/////////////////////////////////////////////////////////////////////////////
		732
		733	// something like a vector or stack, but without
		734	// out of bounds checking
		735	template<typename T>
		736	struct fixed_stack
		737	{
		738	T *data;
		739	int size;
		740	int max;
		741
		742	fixed_stack ()
		743	: size (0), data (0)
		744	{
		745	}
		746
		747	fixed_stack (int max)
		748	: size (0), max (max)
		749	{
		750	data = salloc<T> (max);
		751	}
		752
		753	void reset (int new_max)
		754	{
		755	sfree (data, max);
		756	size = 0;
		757	max = new_max;
		758	data = salloc<T> (max);
		759	}
		760
		761	void free ()
		762	{
		763	sfree (data, max);
		764	data = 0;
		765	}
		766
		767	~fixed_stack ()
		768	{
		769	sfree (data, max);
		770	}
		771
		772	T &operator[](int idx)
		773	{
		774	return data [idx];
		775	}
		776
		777	void push (T v)
		778	{
		779	data [size++] = v;
		780	}
		781
		782	T &pop ()
		783	{
		784	return data [--size];
		785	}
		786
		787	T remove (int idx)
		788	{
		789	T v = data [idx];
		790
		791	data [idx] = data [--size];
		792
		793	return v;
		794	}
		795	};
		796
		797	/////////////////////////////////////////////////////////////////////////////
204		798
205	// basically does what strncpy should do, but appends "..." to strings exceeding length	799	// basically does what strncpy should do, but appends "..." to strings exceeding length
		800	// returns the number of bytes actually used (including \0)
206	void assign (char dst, const char src, int maxlen);	801	int assign (char dst, const char src, int maxsize);
207		802
208	// type-safe version of assign	803	// type-safe version of assign
209	template<int N>	804	template<int N>
210	inline void assign (char (&dst)[N], const char *src)	805	inline int assign (char (&dst)[N], const char *src)
211	{	806	{
212	assign ((char *)&dst, src, N);	807	return assign ((char *)&dst, src, N);
213	}	808	}
214		809
		810	typedef double tstamp;
		811
		812	// return current time as timestamp
		813	tstamp now ();
		814
		815	int similar_direction (int a, int b);
		816
		817	// like v?sprintf, but returns a "static" buffer
		818	char vformat (const char format, va_list ap);
		819	char format (const char format, ...) attribute ((format (printf, 1, 2)));
		820
		821	// safety-check player input which will become object->msg
		822	bool msg_is_safe (const char *msg);
		823
		824	/////////////////////////////////////////////////////////////////////////////
		825	// threads, very very thin wrappers around pthreads
		826
		827	struct thread
		828	{
		829	pthread_t id;
		830
		831	void start (void (start_routine)(void ), void arg = 0);
		832
		833	void cancel ()
		834	{
		835	pthread_cancel (id);
		836	}
		837
		838	void *join ()
		839	{
		840	void *ret;
		841
		842	if (pthread_join (id, &ret))
		843	cleanup ("pthread_join failed", 1);
		844
		845	return ret;
		846	}
		847	};
		848
		849	// note that mutexes are not classes
		850	typedef pthread_mutex_t smutex;
		851
		852	#if __linux && defined (PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP)
		853	#define SMUTEX_INITIALISER PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP
		854	#else
		855	#define SMUTEX_INITIALISER PTHREAD_MUTEX_INITIALIZER
215	#endif	856	#endif
216		857
		858	#define SMUTEX(name) smutex name = SMUTEX_INITIALISER
		859	#define SMUTEX_LOCK(name) pthread_mutex_lock (&(name))
		860	#define SMUTEX_UNLOCK(name) pthread_mutex_unlock (&(name))
		861
		862	typedef pthread_cond_t scond;
		863
		864	#define SCOND(name) scond name = PTHREAD_COND_INITIALIZER
		865	#define SCOND_SIGNAL(name) pthread_cond_signal (&(name))
		866	#define SCOND_BROADCAST(name) pthread_cond_broadcast (&(name))
		867	#define SCOND_WAIT(name,mutex) pthread_cond_wait (&(name), &(mutex))
		868
		869	#endif
		870

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Comparing deliantra/server/include/util.h (file contents): Revision 1.11 by root, Tue Sep 12 20:55:40 2006 UTC vs. Revision 1.125 by root, Wed Nov 14 22:52:13 2018 UTC

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Comparing deliantra/server/include/util.h (file contents):
Revision 1.11 by root, Tue Sep 12 20:55:40 2006 UTC vs.
Revision 1.125 by root, Wed Nov 14 22:52:13 2018 UTC