ViewVC Help
View File | Revision Log | Show Annotations | Download File
/cvs/deliantra/server/include/util.h
(Generate patch)

Comparing deliantra/server/include/util.h (file contents):
Revision 1.18 by root, Sat Dec 16 21:40:26 2006 UTC vs.
Revision 1.30 by root, Mon Jan 15 01:50:33 2007 UTC

… …
6#else 6#else
7# define is_constant(c) 0 7# define is_constant(c) 0
8#endif 8#endif
9 9
10#include <cstddef> 10#include <cstddef>
11#include <cmath>
12#include <new>
13#include <vector>
11 14
12#include <glib.h> 15#include <glib.h>
16
17#include <shstr.h>
18#include <traits.h>
13 19
14// use a gcc extension for auto declarations until ISO C++ sanctifies them 20// use a gcc extension for auto declarations until ISO C++ sanctifies them
15#define AUTODECL(var,expr) typeof(expr) var = (expr) 21#define AUTODECL(var,expr) typeof(expr) var = (expr)
16 22
23// very ugly macro that basicaly declares and initialises a variable
24// that is in scope for the next statement only
25// works only for stuff that can be assigned 0 and converts to false
26// (note: works great for pointers)
27// most ugly macro I ever wrote
28#define declvar(type, name, value) if (type name = 0) { } else if (((name) = (value)), 1)
29
30// in range including end
31#define IN_RANGE_INC(val,beg,end) \
32 ((unsigned int)(val) - (unsigned int)(beg) <= (unsigned int)(end) - (unsigned int)(beg))
33
34// in range excluding end
35#define IN_RANGE_EXC(val,beg,end) \
36 ((unsigned int)(val) - (unsigned int)(beg) < (unsigned int)(end) - (unsigned int)(beg))
37
38// this is much faster than crossfires original algorithm
39// on modern cpus
40inline int
41isqrt (int n)
42{
43 return (int)sqrtf ((float)n);
44}
45
46// this is only twice as fast as naive sqrtf (dx*dy+dy*dy)
47#if 0
48// and has a max. error of 6 in the range -100..+100.
49#else
50// and has a max. error of 9 in the range -100..+100.
51#endif
52inline int
53idistance (int dx, int dy)
54{
55 unsigned int dx_ = abs (dx);
56 unsigned int dy_ = abs (dy);
57
58#if 0
59 return dx_ > dy_
60 ? (dx_ * 61685 + dy_ * 26870) >> 16
61 : (dy_ * 61685 + dx_ * 26870) >> 16;
62#else
63 return dx_ + dy_ - min (dx_, dy_) * 5 / 8;
64#endif
65}
66
67/*
68 * absdir(int): Returns a number between 1 and 8, which represent
69 * the "absolute" direction of a number (it actually takes care of
70 * "overflow" in previous calculations of a direction).
71 */
72inline int
73absdir (int d)
74{
75 return ((d - 1) & 7) + 1;
76}
77
17// makes dynamically allocated objects zero-initialised 78// makes dynamically allocated objects zero-initialised
18struct zero_initialised 79struct zero_initialised
19{ 80{
20 void *operator new (size_t s, void *p) 81 void *operator new (size_t s, void *p)
21 { 82 {
… …
42 { 103 {
43 g_slice_free1 (s, p); 104 g_slice_free1 (s, p);
44 } 105 }
45}; 106};
46 107
108void *salloc_ (int n) throw (std::bad_alloc);
109void *salloc_ (int n, void *src) throw (std::bad_alloc);
110
47// strictly the same as g_slice_alloc, but never returns 0 111// strictly the same as g_slice_alloc, but never returns 0
48void *salloc (int size) throw (std::bad_alloc); 112template<typename T>
113inline T *salloc (int n = 1) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T)); }
114
49// also copies src into the new area, like "memdup" 115// also copies src into the new area, like "memdup"
50// if src is 0, clears the memory 116// if src is 0, clears the memory
51void *salloc (int size, void *src) throw (std::bad_alloc);
52
53// and as a template
54template<typename T> 117template<typename T>
55inline T *salloc (int size) throw (std::bad_alloc) { return (T *)salloc (size * sizeof (T)); } 118inline T *salloc (int n, T *src) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T), (void *)src); }
119
120// clears the memory
56template<typename T> 121template<typename T>
57inline T *salloc (int size, T *src) throw (std::bad_alloc) { return (T *)salloc (size * sizeof (T), (void *)src); } 122inline T *salloc0(int n = 1) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T), 0); }
58 123
59// for symmetry 124// for symmetry
60template<typename T> 125template<typename T>
61inline void sfree (T *ptr, int size) throw () 126inline void sfree (T *ptr, int n = 1) throw ()
62{ 127{
63 g_slice_free1 (size * sizeof (T), (void *)ptr); 128 g_slice_free1 (n * sizeof (T), (void *)ptr);
64} 129}
65 130
66// a STL-compatible allocator that uses g_slice 131// a STL-compatible allocator that uses g_slice
67// boy, this is verbose 132// boy, this is verbose
68template<typename Tp> 133template<typename Tp>
… …
97 return salloc<Tp> (n); 162 return salloc<Tp> (n);
98 } 163 }
99 164
100 void deallocate (pointer p, size_type n) 165 void deallocate (pointer p, size_type n)
101 { 166 {
102 sfree (p, n); 167 sfree<Tp> (p, n);
103 } 168 }
104 169
105 size_type max_size ()const throw () 170 size_type max_size ()const throw ()
106 { 171 {
107 return size_t (-1) / sizeof (Tp); 172 return size_t (-1) / sizeof (Tp);
… …
114 179
115 void destroy (pointer p) 180 void destroy (pointer p)
116 { 181 {
117 p->~Tp (); 182 p->~Tp ();
118 } 183 }
119};
120
121struct refcounted
122{
123 refcounted () : refcnt (0) { }
124// virtual ~refcounted ();
125 void refcnt_inc () { ++refcnt; }
126 void refcnt_dec () { --refcnt; }
127 bool dead () { return refcnt == 0; }
128 mutable int refcnt;
129#if 0
130private:
131 static refcounted *rc_first;
132 refcounted *rc_next;
133#endif
134}; 184};
135 185
136template<class T> 186template<class T>
137struct refptr 187struct refptr
138{ 188{
… …
161 T &operator * () const { return *p; } 211 T &operator * () const { return *p; }
162 T *operator ->() const { return p; } 212 T *operator ->() const { return p; }
163 213
164 operator T *() const { return p; } 214 operator T *() const { return p; }
165}; 215};
216
217typedef refptr<maptile> maptile_ptr;
218typedef refptr<object> object_ptr;
219typedef refptr<archetype> arch_ptr;
220typedef refptr<client> client_ptr;
221typedef refptr<player> player_ptr;
166 222
167struct str_hash 223struct str_hash
168{ 224{
169 std::size_t operator ()(const char *s) const 225 std::size_t operator ()(const char *s) const
170 { 226 {
… …
196 { 252 {
197 return !strcmp (a, b); 253 return !strcmp (a, b);
198 } 254 }
199}; 255};
200 256
201#include <vector>
202
203template<class obj> 257template<class T>
204struct unordered_vector : std::vector<obj, slice_allocator<obj> > 258struct unordered_vector : std::vector<T, slice_allocator<T> >
205{ 259{
206 typedef typename unordered_vector::iterator iterator; 260 typedef typename unordered_vector::iterator iterator;
207 261
208 void erase (unsigned int pos) 262 void erase (unsigned int pos)
209 { 263 {
… …
214 } 268 }
215 269
216 void erase (iterator i) 270 void erase (iterator i)
217 { 271 {
218 erase ((unsigned int )(i - this->begin ())); 272 erase ((unsigned int )(i - this->begin ()));
273 }
274};
275
276template<class T, int T::* index>
277struct object_vector : std::vector<T *, slice_allocator<T *> >
278{
279 void insert (T *obj)
280 {
281 assert (!(obj->*index));
282 push_back (obj);
283 obj->*index = this->size ();
284 }
285
286 void insert (T &obj)
287 {
288 insert (&obj);
289 }
290
291 void erase (T *obj)
292 {
293 assert (obj->*index);
294 int pos = obj->*index;
295 obj->*index = 0;
296
297 if (pos < this->size ())
298 {
299 (*this)[pos - 1] = (*this)[this->size () - 1];
300 (*this)[pos - 1]->*index = pos;
301 }
302
303 this->pop_back ();
304 }
305
306 void erase (T &obj)
307 {
308 errase (&obj);
219 } 309 }
220}; 310};
221 311
222template<typename T, typename U> static inline T min (T a, U b) { return a < (T)b ? a : (T)b; } 312template<typename T, typename U> static inline T min (T a, U b) { return a < (T)b ? a : (T)b; }
223template<typename T, typename U> static inline T max (T a, U b) { return a > (T)b ? a : (T)b; } 313template<typename T, typename U> static inline T max (T a, U b) { return a > (T)b ? a : (T)b; }
… …
238typedef double tstamp; 328typedef double tstamp;
239 329
240// return current time as timestampe 330// return current time as timestampe
241tstamp now (); 331tstamp now ();
242 332
333int similar_direction (int a, int b);
334
243#endif 335#endif
244 336

Diff Legend

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