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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