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Comparing deliantra/server/include/util.h (file contents):
Revision 1.101 by root, Wed Apr 28 19:49:50 2010 UTC vs.
Revision 1.106 by root, Sun May 2 11:23:51 2010 UTC

… …
55#endif 55#endif
56 56
57// use C0X decltype for auto declarations until ISO C++ sanctifies them (if ever) 57// use C0X decltype for auto declarations until ISO C++ sanctifies them (if ever)
58#define auto(var,expr) decltype(expr) var = (expr) 58#define auto(var,expr) decltype(expr) var = (expr)
59 59
60// could use the sizeof (arr) /( sizeof (arr [0]) here, but C++ is 60#if cplusplus_does_not_suck
61// much more obfuscated... :) 61// does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm)
62
63template<typename T, int N> 62template<typename T, int N>
64inline int array_length (const T (&arr)[N]) 63static inline int array_length (const T (&arr)[N])
65{ 64{
66 return N; 65 return N;
67} 66}
67#else
68#define array_length(name) (sizeof (name) / sizeof (name [0]))
69#endif
68 70
69// very ugly macro that basically declares and initialises a variable 71// very ugly macro that basically declares and initialises a variable
70// that is in scope for the next statement only 72// that is in scope for the next statement only
71// works only for stuff that can be assigned 0 and converts to false 73// works only for stuff that can be assigned 0 and converts to false
72// (note: works great for pointers) 74// (note: works great for pointers)
… …
102// sign returns -1 or +1 104// sign returns -1 or +1
103template<typename T> 105template<typename T>
104static inline T sign (T v) { return v < 0 ? -1 : +1; } 106static inline T sign (T v) { return v < 0 ? -1 : +1; }
105// relies on 2c representation 107// relies on 2c representation
106template<> 108template<>
107inline sint8 sign (sint8 v) { return 1 - (sint8 (uint8 (v) >> 7) * 2); } 109inline sint8 sign (sint8 v) { return 1 - (sint8 (uint8 (v) >> 7) * 2); }
110template<>
111inline sint16 sign (sint16 v) { return 1 - (sint16 (uint16 (v) >> 15) * 2); }
112template<>
113inline sint32 sign (sint32 v) { return 1 - (sint32 (uint32 (v) >> 31) * 2); }
108 114
109// sign0 returns -1, 0 or +1 115// sign0 returns -1, 0 or +1
110template<typename T> 116template<typename T>
111static inline T sign0 (T v) { return v ? sign (v) : 0; } 117static inline T sign0 (T v) { return v ? sign (v) : 0; }
112 118
… …
117// div, with correct rounding (< 0.5 downwards, >=0.5 upwards) 123// div, with correct rounding (< 0.5 downwards, >=0.5 upwards)
118template<typename T> static inline T div (T val, T div) 124template<typename T> static inline T div (T val, T div)
119{ 125{
120 return expect_false (val < 0) ? - ((-val + (div - 1) / 2) / div) : (val + div / 2) / div; 126 return expect_false (val < 0) ? - ((-val + (div - 1) / 2) / div) : (val + div / 2) / div;
121} 127}
128
129template<> inline float div (float val, float div) { return val / div; }
130template<> inline double div (double val, double div) { return val / div; }
131
122// div, round-up 132// div, round-up
123template<typename T> static inline T div_ru (T val, T div) 133template<typename T> static inline T div_ru (T val, T div)
124{ 134{
125 return expect_false (val < 0) ? - ((-val ) / div) : (val + div - 1) / div; 135 return expect_false (val < 0) ? - ((-val ) / div) : (val + div - 1) / div;
126} 136}
… …
471}; 481};
472 482
473template<class generator> 483template<class generator>
474struct random_number_generator : generator 484struct random_number_generator : generator
475{ 485{
476 // uniform distribution, 0 .. max (0, num - 1) 486 // uniform distribution, [0 .. num - 1]
477 uint32_t operator ()(uint32_t num) 487 uint32_t operator ()(uint32_t num)
478 { 488 {
479 return !is_constant (num) ? get_range (num) // non-constant 489 return !is_constant (num) ? get_range (num) // non-constant
480 : num & (num - 1) ? (this->next () * (uint64_t)num) >> 32U // constant, non-power-of-two 490 : num & (num - 1) ? (this->next () * (uint64_t)num) >> 32U // constant, non-power-of-two
481 : this->next () & (num - 1); // constant, power-of-two 491 : this->next () & (num - 1); // constant, power-of-two
482 } 492 }
483 493
484 // return a number within the closed interval [min .. max] 494 // return a number within the closed interval [min .. max]
485 int operator () (int r_min, int r_max) 495 int operator () (int r_min, int r_max)
486 { 496 {
487 return is_constant (r_min) && is_constant (r_max) && r_min <= r_max 497 return is_constant (r_min <= r_max) && r_min <= r_max
488 ? r_min + operator ()(r_max - r_min + 1) 498 ? r_min + operator ()(r_max - r_min + 1)
489 : get_range (r_min, r_max); 499 : get_range (r_min, r_max);
490 } 500 }
491 501
492 // return a number within the closed interval [0..1] 502 // return a number within the half-open interval [0..1[
493 double operator ()() 503 double operator ()()
494 { 504 {
495 return this->next () / (double)0xFFFFFFFFU; 505 return this->next () / 0x100000000;
496 } 506 }
497 507
498protected: 508protected:
499 uint32_t get_range (uint32_t r_max); 509 uint32_t get_range (uint32_t r_max);
500 int get_range (int r_min, int r_max); 510 int get_range (int r_min, int r_max);
… …
572typedef refptr<maptile> maptile_ptr; 582typedef refptr<maptile> maptile_ptr;
573typedef refptr<object> object_ptr; 583typedef refptr<object> object_ptr;
574typedef refptr<archetype> arch_ptr; 584typedef refptr<archetype> arch_ptr;
575typedef refptr<client> client_ptr; 585typedef refptr<client> client_ptr;
576typedef refptr<player> player_ptr; 586typedef refptr<player> player_ptr;
587typedef refptr<region> region_ptr;
577 588
578#define STRHSH_NULL 2166136261 589#define STRHSH_NULL 2166136261
579 590
580static inline uint32_t 591static inline uint32_t
581strhsh (const char *s) 592strhsh (const char *s)

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