mt19937ar.h

00001 /*
00002 ** mt19937ar.h - MT Random functions
00003 **
00004 ** See Copyright Notice in mruby.h
00005 */
00006 
00007 #define N 624
00008 
00009 typedef struct {
00010   unsigned long mt[N];
00011   int mti;
00012   union {
00013     unsigned long int_;
00014     double double_;
00015   } gen;
00016 
00017   mrb_int seed;
00018   mrb_bool has_seed : 1;
00019 } mt_state;
00020 
00021 void mrb_random_init_genrand(mt_state *, unsigned long);
00022 unsigned long mrb_random_genrand_int32(mt_state *);
00023 double mrb_random_genrand_real1(mt_state *t);
00024 
00025 /* initializes mt[N] with a seed */
00026 void init_genrand(unsigned long s);
00027 
00028 /* initialize by an array with array-length */
00029 /* init_key is the array for initializing keys */
00030 /* key_length is its length */
00031 /* slight change for C++, 2004/2/26 */
00032 void init_by_array(unsigned long init_key[], int key_length);
00033 
00034 /* generates a random number on [0,0xffffffff]-interval */
00035 unsigned long genrand_int32(void);
00036 
00037 /* generates a random number on [0,0x7fffffff]-interval */
00038 long genrand_int31(void);
00039 
00040 /* These real versions are due to Isaku Wada, 2002/01/09 added */
00041 /* generates a random number on [0,1]-real-interval */
00042 double genrand_real1(void);
00043 
00044 /* generates a random number on [0,1)-real-interval */
00045 double genrand_real2(void);
00046 
00047 /* generates a random number on (0,1)-real-interval */
00048 double genrand_real3(void);
00049 
00050 /* generates a random number on [0,1) with 53-bit resolution*/
00051 double genrand_res53(void);
00052