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Comparing deliantra/server/include/util.h (file contents):
Revision 1.1 by root, Sat Sep 2 22:57:55 2006 UTC vs.
Revision 1.24 by root, Mon Dec 25 11:25:49 2006 UTC

1#ifndef UTIL_H__ 1#ifndef UTIL_H__
2#define UTIL_H__ 2#define UTIL_H__
3 3
4#if __GNUC__ >= 3
5# define is_constant(c) __builtin_constant_p (c)
6#else
7# define is_constant(c) 0
8#endif
9
10#include <cstddef>
11
12#include <glib.h>
13
14// use a gcc extension for auto declarations until ISO C++ sanctifies them
15#define AUTODECL(var,expr) typeof(expr) var = (expr)
16
4// makes dynamically allocated objects zero-initialised 17// makes dynamically allocated objects zero-initialised
5struct zero_initialised 18struct zero_initialised
6{ 19{
20 void *operator new (size_t s, void *p)
21 {
22 memset (p, 0, s);
23 return p;
24 }
25
7 void *operator new (size_t s); 26 void *operator new (size_t s)
27 {
28 return g_slice_alloc0 (s);
29 }
30
31 void *operator new[] (size_t s)
32 {
33 return g_slice_alloc0 (s);
34 }
35
8 void operator delete (void *p, size_t s); 36 void operator delete (void *p, size_t s)
37 {
38 g_slice_free1 (s, p);
39 }
40
41 void operator delete[] (void *p, size_t s)
42 {
43 g_slice_free1 (s, p);
44 }
9}; 45};
46
47void *salloc_ (int n) throw (std::bad_alloc);
48void *salloc_ (int n, void *src) throw (std::bad_alloc);
49
50// strictly the same as g_slice_alloc, but never returns 0
51template<typename T>
52inline T *salloc (int n = 1) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T)); }
53
54// also copies src into the new area, like "memdup"
55// if src is 0, clears the memory
56template<typename T>
57inline T *salloc (int n, T *src) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T), (void *)src); }
58
59// clears the memory
60template<typename T>
61inline T *salloc0(int n = 1) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T), 0); }
62
63// for symmetry
64template<typename T>
65inline void sfree (T *ptr, int n = 1) throw ()
66{
67 g_slice_free1 (n * sizeof (T), (void *)ptr);
68}
69
70// a STL-compatible allocator that uses g_slice
71// boy, this is verbose
72template<typename Tp>
73struct slice_allocator
74{
75 typedef size_t size_type;
76 typedef ptrdiff_t difference_type;
77 typedef Tp *pointer;
78 typedef const Tp *const_pointer;
79 typedef Tp &reference;
80 typedef const Tp &const_reference;
81 typedef Tp value_type;
82
83 template <class U>
84 struct rebind
85 {
86 typedef slice_allocator<U> other;
87 };
88
89 slice_allocator () throw () { }
90 slice_allocator (const slice_allocator &o) throw () { }
91 template<typename Tp2>
92 slice_allocator (const slice_allocator<Tp2> &) throw () { }
93
94 ~slice_allocator () { }
95
96 pointer address (reference x) const { return &x; }
97 const_pointer address (const_reference x) const { return &x; }
98
99 pointer allocate (size_type n, const_pointer = 0)
100 {
101 return salloc<Tp> (n);
102 }
103
104 void deallocate (pointer p, size_type n)
105 {
106 sfree<Tp> (p, n);
107 }
108
109 size_type max_size ()const throw ()
110 {
111 return size_t (-1) / sizeof (Tp);
112 }
113
114 void construct (pointer p, const Tp &val)
115 {
116 ::new (p) Tp (val);
117 }
118
119 void destroy (pointer p)
120 {
121 p->~Tp ();
122 }
123};
124
125template<class T>
126struct refptr
127{
128 T *p;
129
130 refptr () : p(0) { }
131 refptr (const refptr<T> &p) : p(p.p) { if (p) p->refcnt_inc (); }
132 refptr (T *p) : p(p) { if (p) p->refcnt_inc (); }
133 ~refptr () { if (p) p->refcnt_dec (); }
134
135 const refptr<T> &operator =(T *o)
136 {
137 if (p) p->refcnt_dec ();
138 p = o;
139 if (p) p->refcnt_inc ();
140
141 return *this;
142 }
143
144 const refptr<T> &operator =(const refptr<T> o)
145 {
146 *this = o.p;
147 return *this;
148 }
149
150 T &operator * () const { return *p; }
151 T *operator ->() const { return p; }
152
153 operator T *() const { return p; }
154};
155
156typedef refptr<maptile> maptile_ptr;
157typedef refptr<object> object_ptr;
158typedef refptr<archetype> arch_ptr;
159typedef refptr<client> client_ptr;
160typedef refptr<player> player_ptr;
161
162struct str_hash
163{
164 std::size_t operator ()(const char *s) const
165 {
166 unsigned long hash = 0;
167
168 /* use the one-at-a-time hash function, which supposedly is
169 * better than the djb2-like one used by perl5.005, but
170 * certainly is better then the bug used here before.
171 * see http://burtleburtle.net/bob/hash/doobs.html
172 */
173 while (*s)
174 {
175 hash += *s++;
176 hash += hash << 10;
177 hash ^= hash >> 6;
178 }
179
180 hash += hash << 3;
181 hash ^= hash >> 11;
182 hash += hash << 15;
183
184 return hash;
185 }
186};
187
188struct str_equal
189{
190 bool operator ()(const char *a, const char *b) const
191 {
192 return !strcmp (a, b);
193 }
194};
195
196#include <vector>
197
198template<class obj>
199struct unordered_vector : std::vector<obj, slice_allocator<obj> >
200{
201 typedef typename unordered_vector::iterator iterator;
202
203 void erase (unsigned int pos)
204 {
205 if (pos < this->size () - 1)
206 (*this)[pos] = (*this)[this->size () - 1];
207
208 this->pop_back ();
209 }
210
211 void erase (iterator i)
212 {
213 erase ((unsigned int )(i - this->begin ()));
214 }
215};
216
217template<typename T, typename U> static inline T min (T a, U b) { return a < (T)b ? a : (T)b; }
218template<typename T, typename U> static inline T max (T a, U b) { return a > (T)b ? a : (T)b; }
219template<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; }
220
221template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; }
222
223// basically does what strncpy should do, but appends "..." to strings exceeding length
224void assign (char *dst, const char *src, int maxlen);
225
226// type-safe version of assign
227template<int N>
228inline void assign (char (&dst)[N], const char *src)
229{
230 assign ((char *)&dst, src, N);
231}
232
233typedef double tstamp;
234
235// return current time as timestampe
236tstamp now ();
10 237
11#endif 238#endif
12 239

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