[270] | 1 | /*
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| 2 | ** mt19937ar.h - MT Random functions
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| 3 | **
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| 4 | ** See Copyright Notice in mruby.h
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| 5 | */
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| 6 |
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| 7 | #define N 624
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| 8 |
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| 9 | typedef struct {
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| 10 | unsigned long mt[N];
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| 11 | int mti;
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| 12 | union {
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| 13 | unsigned long int_;
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| 14 | double double_;
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| 15 | } gen;
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| 16 |
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| 17 | mrb_int seed;
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| 18 | mrb_bool has_seed : 1;
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| 19 | } mt_state;
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| 20 |
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| 21 | void mrb_random_init_genrand(mt_state *, unsigned long);
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| 22 | unsigned long mrb_random_genrand_int32(mt_state *);
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| 23 | double mrb_random_genrand_real1(mt_state *t);
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| 24 |
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| 25 | /* initializes mt[N] with a seed */
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| 26 | void init_genrand(unsigned long s);
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| 27 |
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| 28 | /* initialize by an array with array-length */
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| 29 | /* init_key is the array for initializing keys */
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| 30 | /* key_length is its length */
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| 31 | /* slight change for C++, 2004/2/26 */
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| 32 | void init_by_array(unsigned long init_key[], int key_length);
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| 33 |
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| 34 | /* generates a random number on [0,0xffffffff]-interval */
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| 35 | unsigned long genrand_int32(void);
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| 36 |
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| 37 | /* generates a random number on [0,0x7fffffff]-interval */
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| 38 | long genrand_int31(void);
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| 39 |
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| 40 | /* These real versions are due to Isaku Wada, 2002/01/09 added */
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| 41 | /* generates a random number on [0,1]-real-interval */
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| 42 | double genrand_real1(void);
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| 43 |
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| 44 | /* generates a random number on [0,1)-real-interval */
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| 45 | double genrand_real2(void);
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| 46 |
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| 47 | /* generates a random number on (0,1)-real-interval */
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| 48 | double genrand_real3(void);
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| 49 |
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| 50 | /* generates a random number on [0,1) with 53-bit resolution*/
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| 51 | double genrand_res53(void);
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