server/include/util.h

#ifndef UTIL_H__
#define UTIL_H__

#if __GNUC__ >= 3
# define is_constant(c) __builtin_constant_p (c)
#else
# define is_constant(c) 0
#endif

#include <cstddef>

#include <glib.h>

// use a gcc extension for auto declarations until ISO C++ sanctifies them
#define AUTODECL(var,expr) typeof(expr) var = (expr)

// makes dynamically allocated objects zero-initialised
struct zero_initialised
{
  void *operator new (size_t s, void *p)
  {
    memset (p, 0, s);
    return p;
  }

  void *operator new (size_t s)
  {
    return g_slice_alloc0 (s);
  }

  void *operator new[] (size_t s)
  {
    return g_slice_alloc0 (s);
  }

  void operator delete (void *p, size_t s)
  {
    g_slice_free1 (s, p);
  }

  void operator delete[] (void *p, size_t s)
  {
    g_slice_free1 (s, p);
  }
};

void *salloc_ (int n)            throw (std::bad_alloc);
void *salloc_ (int n, void *src) throw (std::bad_alloc);

// strictly the same as g_slice_alloc, but never returns 0
template<typename T>
inline T *salloc (int n = 1)     throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T));              }

// also copies src into the new area, like "memdup"
// if src is 0, clears the memory
template<typename T>
inline T *salloc (int n, T *src) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T), (void *)src); }

// clears the memory
template<typename T>
inline T *salloc0(int n = 1)     throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T), 0);           }

// for symmetry
template<typename T>
inline void sfree (T *ptr, int n = 1) throw ()
{
  g_slice_free1 (n * sizeof (T), (void *)ptr);
}

// a STL-compatible allocator that uses g_slice
// boy, this is verbose
template<typename Tp>
struct slice_allocator
{
  typedef size_t size_type;
  typedef ptrdiff_t difference_type;
  typedef Tp *pointer;
  typedef const Tp *const_pointer;
  typedef Tp &reference;
  typedef const Tp &const_reference;
  typedef Tp value_type;

  template <class U> 
  struct rebind
  {
    typedef slice_allocator<U> other;
  };

  slice_allocator () throw () { }
  slice_allocator (const slice_allocator &o) throw () { }
  template<typename Tp2>
  slice_allocator (const slice_allocator<Tp2> &) throw () { }

  ~slice_allocator () { }

  pointer address (reference x) const { return &x; }
  const_pointer address (const_reference x) const { return &x; }

  pointer allocate (size_type n, const_pointer = 0)
  {
    return salloc<Tp> (n);
  }

  void deallocate (pointer p, size_type n)
  {
    sfree<Tp> (p, n);
  }

  size_type max_size ()const throw ()
  {
    return size_t (-1) / sizeof (Tp);
  }

  void construct (pointer p, const Tp &val)
  {
    ::new (p) Tp (val);
  }

  void destroy (pointer p)
  {
    p->~Tp ();
  }
};

template<class T>
struct refptr
{
  T *p;

  refptr () : p(0) { }
  refptr (const refptr<T> &p) : p(p.p) { if (p) p->refcnt_inc (); }
  refptr (T *p) : p(p) { if (p) p->refcnt_inc (); }
  ~refptr () { if (p) p->refcnt_dec (); }

  const refptr<T> &operator =(T *o)
  {
    if (p) p->refcnt_dec ();
    p = o;
    if (p) p->refcnt_inc ();

    return *this;
  }

  const refptr<T> &operator =(const refptr<T> o)
  {
    *this = o.p;
    return *this;
  }

  T &operator * () const { return *p; }
  T *operator ->() const { return p; }

  operator T *() const { return p; }
};

typedef refptr<maptile>   maptile_ptr;
typedef refptr<object>    object_ptr;
typedef refptr<archetype> arch_ptr;
typedef refptr<client>    client_ptr;
typedef refptr<player>    player_ptr;

struct str_hash
{
  std::size_t operator ()(const char *s) const
  {
    unsigned long hash = 0;

    /* use the one-at-a-time hash function, which supposedly is
     * better than the djb2-like one used by perl5.005, but
     * certainly is better then the bug used here before.
     * see http://burtleburtle.net/bob/hash/doobs.html
     */
    while (*s)
      {
        hash += *s++;
        hash += hash << 10;
        hash ^= hash >>  6;
      }

    hash += hash <<  3;
    hash ^= hash >> 11;
    hash += hash << 15;

    return hash;
  }
};

struct str_equal
{
  bool operator ()(const char *a, const char *b) const
  {
    return !strcmp (a, b);
  }
};

#include <vector>

template<class obj>
struct unordered_vector : std::vector<obj, slice_allocator<obj> >
{
  typedef typename unordered_vector::iterator iterator;

  void erase (unsigned int pos)
  {
    if (pos < this->size () - 1)
      (*this)[pos] = (*this)[this->size () - 1];

    this->pop_back ();
  }

  void erase (iterator i)
  {
    erase ((unsigned int )(i - this->begin ()));
  }
};

template<typename T, typename U> static inline T min (T a, U b) { return a < (T)b ? a : (T)b; }
template<typename T, typename U> static inline T max (T a, U b) { return a > (T)b ? a : (T)b; }
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; }

template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; }

// basically does what strncpy should do, but appends "..." to strings exceeding length
void assign (char *dst, const char *src, int maxlen);

// type-safe version of assign
template<int N>
inline void assign (char (&dst)[N], const char *src)
{
  assign ((char *)&dst, src, N);
}

typedef double tstamp;

// return current time as timestampe
tstamp now ();

#endif

Revision:	1.24
Committed:	Mon Dec 25 11:25:49 2006 UTC (17 years, 5 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.23:	+3 -16 lines
Log Message:	- small, but subtle, rewrite of object management - perl will now keep attachable objects alive - objects are now refcounted - refcouts need to be tested explicitly (refcnt_chk) - explicit destroy is required current - explicit destroy asks "nicely" for the object to self destruct, if possible - refcounts will be used during mortal killing - minor bugfixes, optimisations etc. - some former hacks removed.
#	User	Rev	Content
1	root	1.1	#ifndef UTIL_H__
2			#define UTIL_H__
3
4	root	1.2	#if __GNUC__ >= 3
5			# define is_constant(c) __builtin_constant_p (c)
6			#else
7			# define is_constant(c) 0
8			#endif
9
10	root	1.11	#include <cstddef>
11
12			#include <glib.h>
13
14	root	1.14	// use a gcc extension for auto declarations until ISO C++ sanctifies them
15			#define AUTODECL(var,expr) typeof(expr) var = (expr)
16
17	root	1.1	// makes dynamically allocated objects zero-initialised
18			struct zero_initialised
19			{
20	root	1.11	void operator new (size_t s, void p)
21			{
22			memset (p, 0, s);
23			return p;
24			}
25
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
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			}
45			};
46
47	root	1.20	void *salloc_ (int n) throw (std::bad_alloc);
48			void salloc_ (int n, void src) throw (std::bad_alloc);
49
50	root	1.12	// strictly the same as g_slice_alloc, but never returns 0
51	root	1.20	template<typename T>
52			inline T salloc (int n = 1) throw (std::bad_alloc) { return (T )salloc_ (n * sizeof (T)); }
53
54	root	1.17	// also copies src into the new area, like "memdup"
55	root	1.18	// if src is 0, clears the memory
56			template<typename T>
57	root	1.20	inline T salloc (int n, T src) throw (std::bad_alloc) { return (T )salloc_ (n sizeof (T), (void *)src); }
58	root	1.18
59	root	1.21	// clears the memory
60			template<typename T>
61			inline T salloc0(int n = 1) throw (std::bad_alloc) { return (T )salloc_ (n * sizeof (T), 0); }
62
63	root	1.12	// for symmetry
64	root	1.18	template<typename T>
65	root	1.20	inline void sfree (T *ptr, int n = 1) throw ()
66	root	1.12	{
67	root	1.20	g_slice_free1 (n * sizeof (T), (void *)ptr);
68	root	1.12	}
69	root	1.11
70			// a STL-compatible allocator that uses g_slice
71			// boy, this is verbose
72			template<typename Tp>
73			struct 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	root	1.18	return salloc<Tp> (n);
102	root	1.11	}
103
104			void deallocate (pointer p, size_type n)
105			{
106	root	1.19	sfree<Tp> (p, n);
107	root	1.11	}
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	root	1.1	};
124
125	root	1.7	template<class T>
126			struct 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
156	root	1.24	typedef refptr<maptile> maptile_ptr;
157	root	1.22	typedef refptr<object> object_ptr;
158			typedef refptr<archetype> arch_ptr;
159	root	1.24	typedef refptr<client> client_ptr;
160			typedef refptr<player> player_ptr;
161	root	1.22
162	root	1.4	struct 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
188			struct str_equal
189			{
190			bool operator ()(const char a, const char b) const
191			{
192			return !strcmp (a, b);
193			}
194			};
195
196	root	1.6	#include <vector>
197
198			template<class obj>
199	root	1.11	struct unordered_vector : std::vector<obj, slice_allocator<obj> >
200	root	1.6	{
201	root	1.11	typedef typename unordered_vector::iterator iterator;
202	root	1.6
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
217	root	1.8	template<typename T, typename U> static inline T min (T a, U b) { return a < (T)b ? a : (T)b; }
218			template<typename T, typename U> static inline T max (T a, U b) { return a > (T)b ? a : (T)b; }
219			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; }
220
221			template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; }
222
223	root	1.10	// basically does what strncpy should do, but appends "..." to strings exceeding length
224			void assign (char dst, const char src, int maxlen);
225
226			// type-safe version of assign
227	root	1.9	template<int N>
228			inline void assign (char (&dst)[N], const char *src)
229			{
230	root	1.10	assign ((char *)&dst, src, N);
231	root	1.9	}
232
233	root	1.17	typedef double tstamp;
234
235			// return current time as timestampe
236			tstamp now ();
237
238	root	1.1	#endif
239