mirror of
https://github.com/mruby/mruby
synced 2026-06-08 16:11:16 +00:00
Yukihiro "Matz" Matsumoto
81 lines
2.8 KiB
C
81 lines
2.8 KiB
C
/*
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** mt19937ar.h - MT Random functions
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**
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** Copyright (C) 1997 - 2016, Makoto Matsumoto and Takuji Nishimura,
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** All rights reserved.
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**
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** Permission is hereby granted, free of charge, to any person obtaining
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** a copy of this software and associated documentation files (the
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** "Software"), to deal in the Software without restriction, including
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** without limitation the rights to use, copy, modify, merge, publish,
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** distribute, sublicense, and/or sell copies of the Software, and to
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** permit persons to whom the Software is furnished to do so, subject to
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** the following conditions:
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**
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** The above copyright notice and this permission notice shall be
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** included in all copies or substantial portions of the Software.
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**
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** THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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** EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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** MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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** IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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** CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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** TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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** SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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**
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** [ MIT license: http://www.opensource.org/licenses/mit-license.php ]
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**
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** Any feedback is very welcome.
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** http://www.math.sci.hiroshima-u.ac.jp/~m-mat/MT/emt.html
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** email: m-mat @ math.sci.hiroshima-u.ac.jp (remove space)
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**
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** This versios is modified by mruby developers. If you see any problem,
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** contact us first at https://github.com/mruby/mruby/issues
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*/
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#define N 624
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typedef struct {
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unsigned long mt[N];
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int mti;
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union {
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unsigned long int_;
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double double_;
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} gen;
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mrb_int seed;
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mrb_bool has_seed : 1;
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} mt_state;
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void mrb_random_init_genrand(mt_state *, unsigned long);
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unsigned long mrb_random_genrand_int32(mt_state *);
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double mrb_random_genrand_real1(mt_state *t);
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/* initializes mt[N] with a seed */
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void init_genrand(unsigned long s);
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/* initialize by an array with array-length */
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/* init_key is the array for initializing keys */
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/* key_length is its length */
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/* slight change for C++, 2004/2/26 */
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void init_by_array(unsigned long init_key[], int key_length);
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/* generates a random number on [0,0xffffffff]-interval */
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unsigned long genrand_int32(void);
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/* generates a random number on [0,0x7fffffff]-interval */
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long genrand_int31(void);
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/* These real versions are due to Isaku Wada, 2002/01/09 added */
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/* generates a random number on [0,1]-real-interval */
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double genrand_real1(void);
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/* generates a random number on [0,1)-real-interval */
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double genrand_real2(void);
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/* generates a random number on (0,1)-real-interval */
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double genrand_real3(void);
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/* generates a random number on [0,1) with 53-bit resolution*/
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double genrand_res53(void);
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