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fca66f47 | 1 | // random number generation -*- C++ -*- |
2 | ||
f1717362 | 3 | // Copyright (C) 2009-2016 Free Software Foundation, Inc. |
fca66f47 | 4 | // |
5 | // This file is part of the GNU ISO C++ Library. This library is free | |
6 | // software; you can redistribute it and/or modify it under the | |
7 | // terms of the GNU General Public License as published by the | |
6bc9506f | 8 | // Free Software Foundation; either version 3, or (at your option) |
fca66f47 | 9 | // any later version. |
10 | ||
11 | // This library is distributed in the hope that it will be useful, | |
12 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | // GNU General Public License for more details. | |
15 | ||
6bc9506f | 16 | // Under Section 7 of GPL version 3, you are granted additional |
17 | // permissions described in the GCC Runtime Library Exception, version | |
18 | // 3.1, as published by the Free Software Foundation. | |
19 | ||
20 | // You should have received a copy of the GNU General Public License and | |
21 | // a copy of the GCC Runtime Library Exception along with this program; | |
22 | // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
23 | // <http://www.gnu.org/licenses/>. | |
fca66f47 | 24 | |
25 | /** | |
26 | * @file tr1/random.h | |
27 | * This is an internal header file, included by other library headers. | |
5846aeac | 28 | * Do not attempt to use it directly. @headername{tr1/random} |
fca66f47 | 29 | */ |
30 | ||
31 | #ifndef _GLIBCXX_TR1_RANDOM_H | |
32 | #define _GLIBCXX_TR1_RANDOM_H 1 | |
33 | ||
34 | #pragma GCC system_header | |
35 | ||
2948dd21 | 36 | namespace std _GLIBCXX_VISIBILITY(default) |
fca66f47 | 37 | { |
38 | namespace tr1 | |
39 | { | |
fca66f47 | 40 | // [5.1] Random number generation |
41 | ||
42 | /** | |
43 | * @addtogroup tr1_random Random Number Generation | |
44 | * A facility for generating random numbers on selected distributions. | |
45 | * @{ | |
46 | */ | |
47 | ||
48 | /* | |
49 | * Implementation-space details. | |
50 | */ | |
51 | namespace __detail | |
52 | { | |
2948dd21 | 53 | _GLIBCXX_BEGIN_NAMESPACE_VERSION |
54 | ||
fca66f47 | 55 | template<typename _UIntType, int __w, |
56 | bool = __w < std::numeric_limits<_UIntType>::digits> | |
57 | struct _Shift | |
58 | { static const _UIntType __value = 0; }; | |
59 | ||
60 | template<typename _UIntType, int __w> | |
61 | struct _Shift<_UIntType, __w, true> | |
62 | { static const _UIntType __value = _UIntType(1) << __w; }; | |
63 | ||
64 | template<typename _Tp, _Tp __a, _Tp __c, _Tp __m, bool> | |
65 | struct _Mod; | |
66 | ||
67 | // Dispatch based on modulus value to prevent divide-by-zero compile-time | |
68 | // errors when m == 0. | |
69 | template<typename _Tp, _Tp __a, _Tp __c, _Tp __m> | |
70 | inline _Tp | |
71 | __mod(_Tp __x) | |
72 | { return _Mod<_Tp, __a, __c, __m, __m == 0>::__calc(__x); } | |
73 | ||
74 | typedef __gnu_cxx::__conditional_type<(sizeof(unsigned) == 4), | |
75 | unsigned, unsigned long>::__type _UInt32Type; | |
76 | ||
77 | /* | |
78 | * An adaptor class for converting the output of any Generator into | |
79 | * the input for a specific Distribution. | |
80 | */ | |
81 | template<typename _Engine, typename _Distribution> | |
82 | struct _Adaptor | |
83 | { | |
84 | typedef typename remove_reference<_Engine>::type _BEngine; | |
85 | typedef typename _BEngine::result_type _Engine_result_type; | |
86 | typedef typename _Distribution::input_type result_type; | |
87 | ||
88 | public: | |
89 | _Adaptor(const _Engine& __g) | |
90 | : _M_g(__g) { } | |
91 | ||
92 | result_type | |
93 | min() const | |
94 | { | |
95 | result_type __return_value; | |
96 | if (is_integral<_Engine_result_type>::value | |
97 | && is_integral<result_type>::value) | |
98 | __return_value = _M_g.min(); | |
99 | else | |
100 | __return_value = result_type(0); | |
101 | return __return_value; | |
102 | } | |
103 | ||
104 | result_type | |
105 | max() const | |
106 | { | |
107 | result_type __return_value; | |
108 | if (is_integral<_Engine_result_type>::value | |
109 | && is_integral<result_type>::value) | |
110 | __return_value = _M_g.max(); | |
111 | else if (!is_integral<result_type>::value) | |
112 | __return_value = result_type(1); | |
113 | else | |
114 | __return_value = std::numeric_limits<result_type>::max() - 1; | |
115 | return __return_value; | |
116 | } | |
117 | ||
118 | /* | |
119 | * Converts a value generated by the adapted random number generator | |
120 | * into a value in the input domain for the dependent random number | |
121 | * distribution. | |
122 | * | |
123 | * Because the type traits are compile time constants only the | |
124 | * appropriate clause of the if statements will actually be emitted | |
125 | * by the compiler. | |
126 | */ | |
127 | result_type | |
128 | operator()() | |
129 | { | |
130 | result_type __return_value; | |
131 | if (is_integral<_Engine_result_type>::value | |
132 | && is_integral<result_type>::value) | |
133 | __return_value = _M_g(); | |
134 | else if (!is_integral<_Engine_result_type>::value | |
135 | && !is_integral<result_type>::value) | |
136 | __return_value = result_type(_M_g() - _M_g.min()) | |
137 | / result_type(_M_g.max() - _M_g.min()); | |
138 | else if (is_integral<_Engine_result_type>::value | |
139 | && !is_integral<result_type>::value) | |
140 | __return_value = result_type(_M_g() - _M_g.min()) | |
141 | / result_type(_M_g.max() - _M_g.min() + result_type(1)); | |
142 | else | |
143 | __return_value = (((_M_g() - _M_g.min()) | |
144 | / (_M_g.max() - _M_g.min())) | |
145 | * std::numeric_limits<result_type>::max()); | |
146 | return __return_value; | |
147 | } | |
148 | ||
149 | private: | |
150 | _Engine _M_g; | |
151 | }; | |
152 | ||
153 | // Specialization for _Engine*. | |
154 | template<typename _Engine, typename _Distribution> | |
155 | struct _Adaptor<_Engine*, _Distribution> | |
156 | { | |
157 | typedef typename _Engine::result_type _Engine_result_type; | |
158 | typedef typename _Distribution::input_type result_type; | |
159 | ||
160 | public: | |
161 | _Adaptor(_Engine* __g) | |
162 | : _M_g(__g) { } | |
163 | ||
164 | result_type | |
165 | min() const | |
166 | { | |
167 | result_type __return_value; | |
168 | if (is_integral<_Engine_result_type>::value | |
169 | && is_integral<result_type>::value) | |
170 | __return_value = _M_g->min(); | |
171 | else | |
172 | __return_value = result_type(0); | |
173 | return __return_value; | |
174 | } | |
175 | ||
176 | result_type | |
177 | max() const | |
178 | { | |
179 | result_type __return_value; | |
180 | if (is_integral<_Engine_result_type>::value | |
181 | && is_integral<result_type>::value) | |
182 | __return_value = _M_g->max(); | |
183 | else if (!is_integral<result_type>::value) | |
184 | __return_value = result_type(1); | |
185 | else | |
186 | __return_value = std::numeric_limits<result_type>::max() - 1; | |
187 | return __return_value; | |
188 | } | |
189 | ||
190 | result_type | |
191 | operator()() | |
192 | { | |
193 | result_type __return_value; | |
194 | if (is_integral<_Engine_result_type>::value | |
195 | && is_integral<result_type>::value) | |
196 | __return_value = (*_M_g)(); | |
197 | else if (!is_integral<_Engine_result_type>::value | |
198 | && !is_integral<result_type>::value) | |
199 | __return_value = result_type((*_M_g)() - _M_g->min()) | |
200 | / result_type(_M_g->max() - _M_g->min()); | |
201 | else if (is_integral<_Engine_result_type>::value | |
202 | && !is_integral<result_type>::value) | |
203 | __return_value = result_type((*_M_g)() - _M_g->min()) | |
204 | / result_type(_M_g->max() - _M_g->min() + result_type(1)); | |
205 | else | |
206 | __return_value = ((((*_M_g)() - _M_g->min()) | |
207 | / (_M_g->max() - _M_g->min())) | |
208 | * std::numeric_limits<result_type>::max()); | |
209 | return __return_value; | |
210 | } | |
211 | ||
212 | private: | |
213 | _Engine* _M_g; | |
214 | }; | |
2948dd21 | 215 | |
216 | _GLIBCXX_END_NAMESPACE_VERSION | |
fca66f47 | 217 | } // namespace __detail |
218 | ||
2948dd21 | 219 | _GLIBCXX_BEGIN_NAMESPACE_VERSION |
220 | ||
fca66f47 | 221 | /** |
222 | * Produces random numbers on a given distribution function using a | |
223 | * non-uniform random number generation engine. | |
224 | * | |
225 | * @todo the engine_value_type needs to be studied more carefully. | |
226 | */ | |
227 | template<typename _Engine, typename _Dist> | |
228 | class variate_generator | |
229 | { | |
230 | // Concept requirements. | |
231 | __glibcxx_class_requires(_Engine, _CopyConstructibleConcept) | |
232 | // __glibcxx_class_requires(_Engine, _EngineConcept) | |
233 | // __glibcxx_class_requires(_Dist, _EngineConcept) | |
234 | ||
235 | public: | |
236 | typedef _Engine engine_type; | |
237 | typedef __detail::_Adaptor<_Engine, _Dist> engine_value_type; | |
238 | typedef _Dist distribution_type; | |
239 | typedef typename _Dist::result_type result_type; | |
240 | ||
241 | // tr1:5.1.1 table 5.1 requirement | |
242 | typedef typename __gnu_cxx::__enable_if< | |
243 | is_arithmetic<result_type>::value, result_type>::__type _IsValidType; | |
244 | ||
245 | /** | |
246 | * Constructs a variate generator with the uniform random number | |
247 | * generator @p __eng for the random distribution @p __dist. | |
248 | * | |
249 | * @throws Any exceptions which may thrown by the copy constructors of | |
250 | * the @p _Engine or @p _Dist objects. | |
251 | */ | |
252 | variate_generator(engine_type __eng, distribution_type __dist) | |
253 | : _M_engine(__eng), _M_dist(__dist) { } | |
254 | ||
255 | /** | |
256 | * Gets the next generated value on the distribution. | |
257 | */ | |
258 | result_type | |
259 | operator()() | |
260 | { return _M_dist(_M_engine); } | |
261 | ||
262 | /** | |
263 | * WTF? | |
264 | */ | |
265 | template<typename _Tp> | |
266 | result_type | |
267 | operator()(_Tp __value) | |
268 | { return _M_dist(_M_engine, __value); } | |
269 | ||
270 | /** | |
271 | * Gets a reference to the underlying uniform random number generator | |
272 | * object. | |
273 | */ | |
274 | engine_value_type& | |
275 | engine() | |
276 | { return _M_engine; } | |
277 | ||
278 | /** | |
279 | * Gets a const reference to the underlying uniform random number | |
280 | * generator object. | |
281 | */ | |
282 | const engine_value_type& | |
283 | engine() const | |
284 | { return _M_engine; } | |
285 | ||
286 | /** | |
287 | * Gets a reference to the underlying random distribution. | |
288 | */ | |
289 | distribution_type& | |
290 | distribution() | |
291 | { return _M_dist; } | |
292 | ||
293 | /** | |
294 | * Gets a const reference to the underlying random distribution. | |
295 | */ | |
296 | const distribution_type& | |
297 | distribution() const | |
298 | { return _M_dist; } | |
299 | ||
300 | /** | |
301 | * Gets the closed lower bound of the distribution interval. | |
302 | */ | |
303 | result_type | |
304 | min() const | |
305 | { return this->distribution().min(); } | |
306 | ||
307 | /** | |
308 | * Gets the closed upper bound of the distribution interval. | |
309 | */ | |
310 | result_type | |
311 | max() const | |
312 | { return this->distribution().max(); } | |
313 | ||
314 | private: | |
315 | engine_value_type _M_engine; | |
316 | distribution_type _M_dist; | |
317 | }; | |
318 | ||
319 | ||
320 | /** | |
321 | * @addtogroup tr1_random_generators Random Number Generators | |
322 | * @ingroup tr1_random | |
323 | * | |
324 | * These classes define objects which provide random or pseudorandom | |
325 | * numbers, either from a discrete or a continuous interval. The | |
326 | * random number generator supplied as a part of this library are | |
327 | * all uniform random number generators which provide a sequence of | |
328 | * random number uniformly distributed over their range. | |
329 | * | |
330 | * A number generator is a function object with an operator() that | |
331 | * takes zero arguments and returns a number. | |
332 | * | |
333 | * A compliant random number generator must satisfy the following | |
334 | * requirements. <table border=1 cellpadding=10 cellspacing=0> | |
335 | * <caption align=top>Random Number Generator Requirements</caption> | |
336 | * <tr><td>To be documented.</td></tr> </table> | |
337 | * | |
338 | * @{ | |
339 | */ | |
340 | ||
341 | /** | |
342 | * @brief A model of a linear congruential random number generator. | |
343 | * | |
344 | * A random number generator that produces pseudorandom numbers using the | |
345 | * linear function @f$x_{i+1}\leftarrow(ax_{i} + c) \bmod m @f$. | |
346 | * | |
347 | * The template parameter @p _UIntType must be an unsigned integral type | |
348 | * large enough to store values up to (__m-1). If the template parameter | |
349 | * @p __m is 0, the modulus @p __m used is | |
350 | * std::numeric_limits<_UIntType>::max() plus 1. Otherwise, the template | |
351 | * parameters @p __a and @p __c must be less than @p __m. | |
352 | * | |
353 | * The size of the state is @f$ 1 @f$. | |
354 | */ | |
355 | template<class _UIntType, _UIntType __a, _UIntType __c, _UIntType __m> | |
356 | class linear_congruential | |
357 | { | |
358 | __glibcxx_class_requires(_UIntType, _UnsignedIntegerConcept) | |
359 | // __glibcpp_class_requires(__a < __m && __c < __m) | |
360 | ||
361 | public: | |
362 | /** The type of the generated random value. */ | |
363 | typedef _UIntType result_type; | |
364 | ||
365 | /** The multiplier. */ | |
366 | static const _UIntType multiplier = __a; | |
367 | /** An increment. */ | |
368 | static const _UIntType increment = __c; | |
369 | /** The modulus. */ | |
370 | static const _UIntType modulus = __m; | |
371 | ||
372 | /** | |
373 | * Constructs a %linear_congruential random number generator engine with | |
374 | * seed @p __s. The default seed value is 1. | |
375 | * | |
376 | * @param __s The initial seed value. | |
377 | */ | |
378 | explicit | |
379 | linear_congruential(unsigned long __x0 = 1) | |
380 | { this->seed(__x0); } | |
381 | ||
382 | /** | |
383 | * Constructs a %linear_congruential random number generator engine | |
384 | * seeded from the generator function @p __g. | |
385 | * | |
386 | * @param __g The seed generator function. | |
387 | */ | |
388 | template<class _Gen> | |
389 | linear_congruential(_Gen& __g) | |
390 | { this->seed(__g); } | |
391 | ||
392 | /** | |
393 | * Reseeds the %linear_congruential random number generator engine | |
394 | * sequence to the seed @g __s. | |
395 | * | |
396 | * @param __s The new seed. | |
397 | */ | |
398 | void | |
399 | seed(unsigned long __s = 1); | |
400 | ||
401 | /** | |
402 | * Reseeds the %linear_congruential random number generator engine | |
403 | * sequence using values from the generator function @p __g. | |
404 | * | |
405 | * @param __g the seed generator function. | |
406 | */ | |
407 | template<class _Gen> | |
408 | void | |
409 | seed(_Gen& __g) | |
410 | { seed(__g, typename is_fundamental<_Gen>::type()); } | |
411 | ||
412 | /** | |
413 | * Gets the smallest possible value in the output range. | |
414 | * | |
415 | * The minimum depends on the @p __c parameter: if it is zero, the | |
416 | * minimum generated must be > 0, otherwise 0 is allowed. | |
417 | */ | |
418 | result_type | |
419 | min() const | |
420 | { return (__detail::__mod<_UIntType, 1, 0, __m>(__c) == 0) ? 1 : 0; } | |
421 | ||
422 | /** | |
423 | * Gets the largest possible value in the output range. | |
424 | */ | |
425 | result_type | |
426 | max() const | |
427 | { return __m - 1; } | |
428 | ||
429 | /** | |
430 | * Gets the next random number in the sequence. | |
431 | */ | |
432 | result_type | |
433 | operator()(); | |
434 | ||
435 | /** | |
436 | * Compares two linear congruential random number generator | |
437 | * objects of the same type for equality. | |
438 | * | |
439 | * @param __lhs A linear congruential random number generator object. | |
440 | * @param __rhs Another linear congruential random number generator obj. | |
441 | * | |
442 | * @returns true if the two objects are equal, false otherwise. | |
443 | */ | |
444 | friend bool | |
445 | operator==(const linear_congruential& __lhs, | |
446 | const linear_congruential& __rhs) | |
447 | { return __lhs._M_x == __rhs._M_x; } | |
448 | ||
449 | /** | |
450 | * Compares two linear congruential random number generator | |
451 | * objects of the same type for inequality. | |
452 | * | |
453 | * @param __lhs A linear congruential random number generator object. | |
454 | * @param __rhs Another linear congruential random number generator obj. | |
455 | * | |
456 | * @returns true if the two objects are not equal, false otherwise. | |
457 | */ | |
458 | friend bool | |
459 | operator!=(const linear_congruential& __lhs, | |
460 | const linear_congruential& __rhs) | |
461 | { return !(__lhs == __rhs); } | |
462 | ||
463 | /** | |
464 | * Writes the textual representation of the state x(i) of x to @p __os. | |
465 | * | |
466 | * @param __os The output stream. | |
467 | * @param __lcr A % linear_congruential random number generator. | |
468 | * @returns __os. | |
469 | */ | |
470 | template<class _UIntType1, _UIntType1 __a1, _UIntType1 __c1, | |
471 | _UIntType1 __m1, | |
472 | typename _CharT, typename _Traits> | |
473 | friend std::basic_ostream<_CharT, _Traits>& | |
474 | operator<<(std::basic_ostream<_CharT, _Traits>& __os, | |
475 | const linear_congruential<_UIntType1, __a1, __c1, | |
476 | __m1>& __lcr); | |
477 | ||
478 | /** | |
479 | * Sets the state of the engine by reading its textual | |
480 | * representation from @p __is. | |
481 | * | |
482 | * The textual representation must have been previously written using an | |
483 | * output stream whose imbued locale and whose type's template | |
484 | * specialization arguments _CharT and _Traits were the same as those of | |
485 | * @p __is. | |
486 | * | |
487 | * @param __is The input stream. | |
488 | * @param __lcr A % linear_congruential random number generator. | |
489 | * @returns __is. | |
490 | */ | |
491 | template<class _UIntType1, _UIntType1 __a1, _UIntType1 __c1, | |
492 | _UIntType1 __m1, | |
493 | typename _CharT, typename _Traits> | |
494 | friend std::basic_istream<_CharT, _Traits>& | |
495 | operator>>(std::basic_istream<_CharT, _Traits>& __is, | |
496 | linear_congruential<_UIntType1, __a1, __c1, __m1>& __lcr); | |
497 | ||
498 | private: | |
499 | template<class _Gen> | |
500 | void | |
501 | seed(_Gen& __g, true_type) | |
502 | { return seed(static_cast<unsigned long>(__g)); } | |
503 | ||
504 | template<class _Gen> | |
505 | void | |
506 | seed(_Gen& __g, false_type); | |
507 | ||
508 | _UIntType _M_x; | |
509 | }; | |
510 | ||
511 | /** | |
512 | * The classic Minimum Standard rand0 of Lewis, Goodman, and Miller. | |
513 | */ | |
514 | typedef linear_congruential<unsigned long, 16807, 0, 2147483647> minstd_rand0; | |
515 | ||
516 | /** | |
517 | * An alternative LCR (Lehmer Generator function) . | |
518 | */ | |
519 | typedef linear_congruential<unsigned long, 48271, 0, 2147483647> minstd_rand; | |
520 | ||
521 | ||
522 | /** | |
523 | * A generalized feedback shift register discrete random number generator. | |
524 | * | |
525 | * This algorithm avoids multiplication and division and is designed to be | |
526 | * friendly to a pipelined architecture. If the parameters are chosen | |
527 | * correctly, this generator will produce numbers with a very long period and | |
528 | * fairly good apparent entropy, although still not cryptographically strong. | |
529 | * | |
530 | * The best way to use this generator is with the predefined mt19937 class. | |
531 | * | |
532 | * This algorithm was originally invented by Makoto Matsumoto and | |
533 | * Takuji Nishimura. | |
534 | * | |
535 | * @var word_size The number of bits in each element of the state vector. | |
536 | * @var state_size The degree of recursion. | |
537 | * @var shift_size The period parameter. | |
538 | * @var mask_bits The separation point bit index. | |
539 | * @var parameter_a The last row of the twist matrix. | |
540 | * @var output_u The first right-shift tempering matrix parameter. | |
541 | * @var output_s The first left-shift tempering matrix parameter. | |
542 | * @var output_b The first left-shift tempering matrix mask. | |
543 | * @var output_t The second left-shift tempering matrix parameter. | |
544 | * @var output_c The second left-shift tempering matrix mask. | |
545 | * @var output_l The second right-shift tempering matrix parameter. | |
546 | */ | |
547 | template<class _UIntType, int __w, int __n, int __m, int __r, | |
548 | _UIntType __a, int __u, int __s, _UIntType __b, int __t, | |
549 | _UIntType __c, int __l> | |
550 | class mersenne_twister | |
551 | { | |
552 | __glibcxx_class_requires(_UIntType, _UnsignedIntegerConcept) | |
553 | ||
554 | public: | |
555 | // types | |
556 | typedef _UIntType result_type; | |
557 | ||
558 | // parameter values | |
559 | static const int word_size = __w; | |
560 | static const int state_size = __n; | |
561 | static const int shift_size = __m; | |
562 | static const int mask_bits = __r; | |
563 | static const _UIntType parameter_a = __a; | |
564 | static const int output_u = __u; | |
565 | static const int output_s = __s; | |
566 | static const _UIntType output_b = __b; | |
567 | static const int output_t = __t; | |
568 | static const _UIntType output_c = __c; | |
569 | static const int output_l = __l; | |
570 | ||
571 | // constructors and member function | |
572 | mersenne_twister() | |
573 | { seed(); } | |
574 | ||
575 | explicit | |
576 | mersenne_twister(unsigned long __value) | |
577 | { seed(__value); } | |
578 | ||
579 | template<class _Gen> | |
580 | mersenne_twister(_Gen& __g) | |
581 | { seed(__g); } | |
582 | ||
583 | void | |
584 | seed() | |
585 | { seed(5489UL); } | |
586 | ||
587 | void | |
588 | seed(unsigned long __value); | |
589 | ||
590 | template<class _Gen> | |
591 | void | |
592 | seed(_Gen& __g) | |
593 | { seed(__g, typename is_fundamental<_Gen>::type()); } | |
594 | ||
595 | result_type | |
596 | min() const | |
597 | { return 0; }; | |
598 | ||
599 | result_type | |
600 | max() const | |
601 | { return __detail::_Shift<_UIntType, __w>::__value - 1; } | |
602 | ||
603 | result_type | |
604 | operator()(); | |
605 | ||
606 | /** | |
607 | * Compares two % mersenne_twister random number generator objects of | |
608 | * the same type for equality. | |
609 | * | |
610 | * @param __lhs A % mersenne_twister random number generator object. | |
611 | * @param __rhs Another % mersenne_twister random number generator | |
612 | * object. | |
613 | * | |
614 | * @returns true if the two objects are equal, false otherwise. | |
615 | */ | |
616 | friend bool | |
617 | operator==(const mersenne_twister& __lhs, | |
618 | const mersenne_twister& __rhs) | |
619 | { return std::equal(__lhs._M_x, __lhs._M_x + state_size, __rhs._M_x); } | |
620 | ||
621 | /** | |
622 | * Compares two % mersenne_twister random number generator objects of | |
623 | * the same type for inequality. | |
624 | * | |
625 | * @param __lhs A % mersenne_twister random number generator object. | |
626 | * @param __rhs Another % mersenne_twister random number generator | |
627 | * object. | |
628 | * | |
629 | * @returns true if the two objects are not equal, false otherwise. | |
630 | */ | |
631 | friend bool | |
632 | operator!=(const mersenne_twister& __lhs, | |
633 | const mersenne_twister& __rhs) | |
634 | { return !(__lhs == __rhs); } | |
635 | ||
636 | /** | |
637 | * Inserts the current state of a % mersenne_twister random number | |
638 | * generator engine @p __x into the output stream @p __os. | |
639 | * | |
640 | * @param __os An output stream. | |
641 | * @param __x A % mersenne_twister random number generator engine. | |
642 | * | |
643 | * @returns The output stream with the state of @p __x inserted or in | |
644 | * an error state. | |
645 | */ | |
646 | template<class _UIntType1, int __w1, int __n1, int __m1, int __r1, | |
647 | _UIntType1 __a1, int __u1, int __s1, _UIntType1 __b1, int __t1, | |
648 | _UIntType1 __c1, int __l1, | |
649 | typename _CharT, typename _Traits> | |
650 | friend std::basic_ostream<_CharT, _Traits>& | |
651 | operator<<(std::basic_ostream<_CharT, _Traits>& __os, | |
652 | const mersenne_twister<_UIntType1, __w1, __n1, __m1, __r1, | |
653 | __a1, __u1, __s1, __b1, __t1, __c1, __l1>& __x); | |
654 | ||
655 | /** | |
656 | * Extracts the current state of a % mersenne_twister random number | |
657 | * generator engine @p __x from the input stream @p __is. | |
658 | * | |
659 | * @param __is An input stream. | |
660 | * @param __x A % mersenne_twister random number generator engine. | |
661 | * | |
662 | * @returns The input stream with the state of @p __x extracted or in | |
663 | * an error state. | |
664 | */ | |
665 | template<class _UIntType1, int __w1, int __n1, int __m1, int __r1, | |
666 | _UIntType1 __a1, int __u1, int __s1, _UIntType1 __b1, int __t1, | |
667 | _UIntType1 __c1, int __l1, | |
668 | typename _CharT, typename _Traits> | |
669 | friend std::basic_istream<_CharT, _Traits>& | |
670 | operator>>(std::basic_istream<_CharT, _Traits>& __is, | |
671 | mersenne_twister<_UIntType1, __w1, __n1, __m1, __r1, | |
672 | __a1, __u1, __s1, __b1, __t1, __c1, __l1>& __x); | |
673 | ||
674 | private: | |
675 | template<class _Gen> | |
676 | void | |
677 | seed(_Gen& __g, true_type) | |
678 | { return seed(static_cast<unsigned long>(__g)); } | |
679 | ||
680 | template<class _Gen> | |
681 | void | |
682 | seed(_Gen& __g, false_type); | |
683 | ||
684 | _UIntType _M_x[state_size]; | |
685 | int _M_p; | |
686 | }; | |
687 | ||
688 | /** | |
689 | * The classic Mersenne Twister. | |
690 | * | |
691 | * Reference: | |
72117d76 | 692 | * M. Matsumoto and T. Nishimura, Mersenne Twister: A 623-Dimensionally |
693 | * Equidistributed Uniform Pseudo-Random Number Generator, ACM Transactions | |
fca66f47 | 694 | * on Modeling and Computer Simulation, Vol. 8, No. 1, January 1998, pp 3-30. |
695 | */ | |
696 | typedef mersenne_twister< | |
697 | unsigned long, 32, 624, 397, 31, | |
698 | 0x9908b0dful, 11, 7, | |
699 | 0x9d2c5680ul, 15, | |
700 | 0xefc60000ul, 18 | |
701 | > mt19937; | |
702 | ||
703 | ||
704 | /** | |
705 | * @brief The Marsaglia-Zaman generator. | |
706 | * | |
707 | * This is a model of a Generalized Fibonacci discrete random number | |
708 | * generator, sometimes referred to as the SWC generator. | |
709 | * | |
710 | * A discrete random number generator that produces pseudorandom | |
711 | * numbers using @f$x_{i}\leftarrow(x_{i - s} - x_{i - r} - | |
712 | * carry_{i-1}) \bmod m @f$. | |
713 | * | |
714 | * The size of the state is @f$ r @f$ | |
715 | * and the maximum period of the generator is @f$ m^r - m^s -1 @f$. | |
716 | * | |
72117d76 | 717 | * N1688[4.13] says <em>the template parameter _IntType shall denote |
718 | * an integral type large enough to store values up to m</em>. | |
fca66f47 | 719 | * |
720 | * @var _M_x The state of the generator. This is a ring buffer. | |
721 | * @var _M_carry The carry. | |
722 | * @var _M_p Current index of x(i - r). | |
723 | */ | |
724 | template<typename _IntType, _IntType __m, int __s, int __r> | |
725 | class subtract_with_carry | |
726 | { | |
727 | __glibcxx_class_requires(_IntType, _IntegerConcept) | |
728 | ||
729 | public: | |
730 | /** The type of the generated random value. */ | |
731 | typedef _IntType result_type; | |
732 | ||
733 | // parameter values | |
734 | static const _IntType modulus = __m; | |
735 | static const int long_lag = __r; | |
736 | static const int short_lag = __s; | |
737 | ||
738 | /** | |
739 | * Constructs a default-initialized % subtract_with_carry random number | |
740 | * generator. | |
741 | */ | |
742 | subtract_with_carry() | |
743 | { this->seed(); } | |
744 | ||
745 | /** | |
746 | * Constructs an explicitly seeded % subtract_with_carry random number | |
747 | * generator. | |
748 | */ | |
749 | explicit | |
750 | subtract_with_carry(unsigned long __value) | |
751 | { this->seed(__value); } | |
752 | ||
753 | /** | |
754 | * Constructs a %subtract_with_carry random number generator engine | |
755 | * seeded from the generator function @p __g. | |
756 | * | |
757 | * @param __g The seed generator function. | |
758 | */ | |
759 | template<class _Gen> | |
760 | subtract_with_carry(_Gen& __g) | |
761 | { this->seed(__g); } | |
762 | ||
763 | /** | |
764 | * Seeds the initial state @f$ x_0 @f$ of the random number generator. | |
765 | * | |
766 | * N1688[4.19] modifies this as follows. If @p __value == 0, | |
767 | * sets value to 19780503. In any case, with a linear | |
768 | * congruential generator lcg(i) having parameters @f$ m_{lcg} = | |
769 | * 2147483563, a_{lcg} = 40014, c_{lcg} = 0, and lcg(0) = value | |
770 | * @f$, sets @f$ x_{-r} \dots x_{-1} @f$ to @f$ lcg(1) \bmod m | |
771 | * \dots lcg(r) \bmod m @f$ respectively. If @f$ x_{-1} = 0 @f$ | |
772 | * set carry to 1, otherwise sets carry to 0. | |
773 | */ | |
774 | void | |
775 | seed(unsigned long __value = 19780503); | |
776 | ||
777 | /** | |
778 | * Seeds the initial state @f$ x_0 @f$ of the % subtract_with_carry | |
779 | * random number generator. | |
780 | */ | |
781 | template<class _Gen> | |
782 | void | |
783 | seed(_Gen& __g) | |
784 | { seed(__g, typename is_fundamental<_Gen>::type()); } | |
785 | ||
786 | /** | |
787 | * Gets the inclusive minimum value of the range of random integers | |
788 | * returned by this generator. | |
789 | */ | |
790 | result_type | |
791 | min() const | |
792 | { return 0; } | |
793 | ||
794 | /** | |
795 | * Gets the inclusive maximum value of the range of random integers | |
796 | * returned by this generator. | |
797 | */ | |
798 | result_type | |
799 | max() const | |
800 | { return this->modulus - 1; } | |
801 | ||
802 | /** | |
803 | * Gets the next random number in the sequence. | |
804 | */ | |
805 | result_type | |
806 | operator()(); | |
807 | ||
808 | /** | |
809 | * Compares two % subtract_with_carry random number generator objects of | |
810 | * the same type for equality. | |
811 | * | |
812 | * @param __lhs A % subtract_with_carry random number generator object. | |
813 | * @param __rhs Another % subtract_with_carry random number generator | |
814 | * object. | |
815 | * | |
816 | * @returns true if the two objects are equal, false otherwise. | |
817 | */ | |
818 | friend bool | |
819 | operator==(const subtract_with_carry& __lhs, | |
820 | const subtract_with_carry& __rhs) | |
821 | { return std::equal(__lhs._M_x, __lhs._M_x + long_lag, __rhs._M_x); } | |
822 | ||
823 | /** | |
824 | * Compares two % subtract_with_carry random number generator objects of | |
825 | * the same type for inequality. | |
826 | * | |
827 | * @param __lhs A % subtract_with_carry random number generator object. | |
828 | * @param __rhs Another % subtract_with_carry random number generator | |
829 | * object. | |
830 | * | |
831 | * @returns true if the two objects are not equal, false otherwise. | |
832 | */ | |
833 | friend bool | |
834 | operator!=(const subtract_with_carry& __lhs, | |
835 | const subtract_with_carry& __rhs) | |
836 | { return !(__lhs == __rhs); } | |
837 | ||
838 | /** | |
839 | * Inserts the current state of a % subtract_with_carry random number | |
840 | * generator engine @p __x into the output stream @p __os. | |
841 | * | |
842 | * @param __os An output stream. | |
843 | * @param __x A % subtract_with_carry random number generator engine. | |
844 | * | |
845 | * @returns The output stream with the state of @p __x inserted or in | |
846 | * an error state. | |
847 | */ | |
848 | template<typename _IntType1, _IntType1 __m1, int __s1, int __r1, | |
849 | typename _CharT, typename _Traits> | |
850 | friend std::basic_ostream<_CharT, _Traits>& | |
851 | operator<<(std::basic_ostream<_CharT, _Traits>& __os, | |
852 | const subtract_with_carry<_IntType1, __m1, __s1, | |
853 | __r1>& __x); | |
854 | ||
855 | /** | |
856 | * Extracts the current state of a % subtract_with_carry random number | |
857 | * generator engine @p __x from the input stream @p __is. | |
858 | * | |
859 | * @param __is An input stream. | |
860 | * @param __x A % subtract_with_carry random number generator engine. | |
861 | * | |
862 | * @returns The input stream with the state of @p __x extracted or in | |
863 | * an error state. | |
864 | */ | |
865 | template<typename _IntType1, _IntType1 __m1, int __s1, int __r1, | |
866 | typename _CharT, typename _Traits> | |
867 | friend std::basic_istream<_CharT, _Traits>& | |
868 | operator>>(std::basic_istream<_CharT, _Traits>& __is, | |
869 | subtract_with_carry<_IntType1, __m1, __s1, __r1>& __x); | |
870 | ||
871 | private: | |
872 | template<class _Gen> | |
873 | void | |
874 | seed(_Gen& __g, true_type) | |
875 | { return seed(static_cast<unsigned long>(__g)); } | |
876 | ||
877 | template<class _Gen> | |
878 | void | |
879 | seed(_Gen& __g, false_type); | |
880 | ||
881 | typedef typename __gnu_cxx::__add_unsigned<_IntType>::__type _UIntType; | |
882 | ||
883 | _UIntType _M_x[long_lag]; | |
884 | _UIntType _M_carry; | |
885 | int _M_p; | |
886 | }; | |
887 | ||
888 | ||
889 | /** | |
890 | * @brief The Marsaglia-Zaman generator (floats version). | |
891 | * | |
892 | * @var _M_x The state of the generator. This is a ring buffer. | |
893 | * @var _M_carry The carry. | |
894 | * @var _M_p Current index of x(i - r). | |
895 | * @var _M_npows Precomputed negative powers of 2. | |
896 | */ | |
897 | template<typename _RealType, int __w, int __s, int __r> | |
898 | class subtract_with_carry_01 | |
899 | { | |
900 | public: | |
901 | /** The type of the generated random value. */ | |
902 | typedef _RealType result_type; | |
903 | ||
904 | // parameter values | |
905 | static const int word_size = __w; | |
906 | static const int long_lag = __r; | |
907 | static const int short_lag = __s; | |
908 | ||
909 | /** | |
910 | * Constructs a default-initialized % subtract_with_carry_01 random | |
911 | * number generator. | |
912 | */ | |
913 | subtract_with_carry_01() | |
914 | { | |
915 | this->seed(); | |
916 | _M_initialize_npows(); | |
917 | } | |
918 | ||
919 | /** | |
920 | * Constructs an explicitly seeded % subtract_with_carry_01 random number | |
921 | * generator. | |
922 | */ | |
923 | explicit | |
924 | subtract_with_carry_01(unsigned long __value) | |
925 | { | |
926 | this->seed(__value); | |
927 | _M_initialize_npows(); | |
928 | } | |
929 | ||
930 | /** | |
931 | * Constructs a % subtract_with_carry_01 random number generator engine | |
932 | * seeded from the generator function @p __g. | |
933 | * | |
934 | * @param __g The seed generator function. | |
935 | */ | |
936 | template<class _Gen> | |
937 | subtract_with_carry_01(_Gen& __g) | |
938 | { | |
939 | this->seed(__g); | |
940 | _M_initialize_npows(); | |
941 | } | |
942 | ||
943 | /** | |
944 | * Seeds the initial state @f$ x_0 @f$ of the random number generator. | |
945 | */ | |
946 | void | |
947 | seed(unsigned long __value = 19780503); | |
948 | ||
949 | /** | |
950 | * Seeds the initial state @f$ x_0 @f$ of the % subtract_with_carry_01 | |
951 | * random number generator. | |
952 | */ | |
953 | template<class _Gen> | |
954 | void | |
955 | seed(_Gen& __g) | |
956 | { seed(__g, typename is_fundamental<_Gen>::type()); } | |
957 | ||
958 | /** | |
959 | * Gets the minimum value of the range of random floats | |
960 | * returned by this generator. | |
961 | */ | |
962 | result_type | |
963 | min() const | |
964 | { return 0.0; } | |
965 | ||
966 | /** | |
967 | * Gets the maximum value of the range of random floats | |
968 | * returned by this generator. | |
969 | */ | |
970 | result_type | |
971 | max() const | |
972 | { return 1.0; } | |
973 | ||
974 | /** | |
975 | * Gets the next random number in the sequence. | |
976 | */ | |
977 | result_type | |
978 | operator()(); | |
979 | ||
980 | /** | |
981 | * Compares two % subtract_with_carry_01 random number generator objects | |
982 | * of the same type for equality. | |
983 | * | |
984 | * @param __lhs A % subtract_with_carry_01 random number | |
985 | * generator object. | |
986 | * @param __rhs Another % subtract_with_carry_01 random number generator | |
987 | * object. | |
988 | * | |
989 | * @returns true if the two objects are equal, false otherwise. | |
990 | */ | |
991 | friend bool | |
992 | operator==(const subtract_with_carry_01& __lhs, | |
993 | const subtract_with_carry_01& __rhs) | |
994 | { | |
995 | for (int __i = 0; __i < long_lag; ++__i) | |
996 | if (!std::equal(__lhs._M_x[__i], __lhs._M_x[__i] + __n, | |
997 | __rhs._M_x[__i])) | |
998 | return false; | |
999 | return true; | |
1000 | } | |
1001 | ||
1002 | /** | |
1003 | * Compares two % subtract_with_carry_01 random number generator objects | |
1004 | * of the same type for inequality. | |
1005 | * | |
1006 | * @param __lhs A % subtract_with_carry_01 random number | |
1007 | * generator object. | |
1008 | * | |
1009 | * @param __rhs Another % subtract_with_carry_01 random number generator | |
1010 | * object. | |
1011 | * | |
1012 | * @returns true if the two objects are not equal, false otherwise. | |
1013 | */ | |
1014 | friend bool | |
1015 | operator!=(const subtract_with_carry_01& __lhs, | |
1016 | const subtract_with_carry_01& __rhs) | |
1017 | { return !(__lhs == __rhs); } | |
1018 | ||
1019 | /** | |
1020 | * Inserts the current state of a % subtract_with_carry_01 random number | |
1021 | * generator engine @p __x into the output stream @p __os. | |
1022 | * | |
1023 | * @param __os An output stream. | |
1024 | * @param __x A % subtract_with_carry_01 random number generator engine. | |
1025 | * | |
1026 | * @returns The output stream with the state of @p __x inserted or in | |
1027 | * an error state. | |
1028 | */ | |
1029 | template<typename _RealType1, int __w1, int __s1, int __r1, | |
1030 | typename _CharT, typename _Traits> | |
1031 | friend std::basic_ostream<_CharT, _Traits>& | |
1032 | operator<<(std::basic_ostream<_CharT, _Traits>& __os, | |
1033 | const subtract_with_carry_01<_RealType1, __w1, __s1, | |
1034 | __r1>& __x); | |
1035 | ||
1036 | /** | |
1037 | * Extracts the current state of a % subtract_with_carry_01 random number | |
1038 | * generator engine @p __x from the input stream @p __is. | |
1039 | * | |
1040 | * @param __is An input stream. | |
1041 | * @param __x A % subtract_with_carry_01 random number generator engine. | |
1042 | * | |
1043 | * @returns The input stream with the state of @p __x extracted or in | |
1044 | * an error state. | |
1045 | */ | |
1046 | template<typename _RealType1, int __w1, int __s1, int __r1, | |
1047 | typename _CharT, typename _Traits> | |
1048 | friend std::basic_istream<_CharT, _Traits>& | |
1049 | operator>>(std::basic_istream<_CharT, _Traits>& __is, | |
1050 | subtract_with_carry_01<_RealType1, __w1, __s1, __r1>& __x); | |
1051 | ||
1052 | private: | |
1053 | template<class _Gen> | |
1054 | void | |
1055 | seed(_Gen& __g, true_type) | |
1056 | { return seed(static_cast<unsigned long>(__g)); } | |
1057 | ||
1058 | template<class _Gen> | |
1059 | void | |
1060 | seed(_Gen& __g, false_type); | |
1061 | ||
1062 | void | |
1063 | _M_initialize_npows(); | |
1064 | ||
1065 | static const int __n = (__w + 31) / 32; | |
1066 | ||
1067 | typedef __detail::_UInt32Type _UInt32Type; | |
1068 | _UInt32Type _M_x[long_lag][__n]; | |
1069 | _RealType _M_npows[__n]; | |
1070 | _UInt32Type _M_carry; | |
1071 | int _M_p; | |
1072 | }; | |
1073 | ||
1074 | typedef subtract_with_carry_01<float, 24, 10, 24> ranlux_base_01; | |
1075 | ||
1076 | // _GLIBCXX_RESOLVE_LIB_DEFECTS | |
1077 | // 508. Bad parameters for ranlux64_base_01. | |
1078 | typedef subtract_with_carry_01<double, 48, 5, 12> ranlux64_base_01; | |
1079 | ||
1080 | ||
1081 | /** | |
1082 | * Produces random numbers from some base engine by discarding blocks of | |
1083 | * data. | |
1084 | * | |
1085 | * 0 <= @p __r <= @p __p | |
1086 | */ | |
1087 | template<class _UniformRandomNumberGenerator, int __p, int __r> | |
1088 | class discard_block | |
1089 | { | |
1090 | // __glibcxx_class_requires(typename base_type::result_type, | |
1091 | // ArithmeticTypeConcept) | |
1092 | ||
1093 | public: | |
1094 | /** The type of the underlying generator engine. */ | |
1095 | typedef _UniformRandomNumberGenerator base_type; | |
1096 | /** The type of the generated random value. */ | |
1097 | typedef typename base_type::result_type result_type; | |
1098 | ||
1099 | // parameter values | |
1100 | static const int block_size = __p; | |
1101 | static const int used_block = __r; | |
1102 | ||
1103 | /** | |
1104 | * Constructs a default %discard_block engine. | |
1105 | * | |
1106 | * The underlying engine is default constructed as well. | |
1107 | */ | |
1108 | discard_block() | |
1109 | : _M_n(0) { } | |
1110 | ||
1111 | /** | |
1112 | * Copy constructs a %discard_block engine. | |
1113 | * | |
1114 | * Copies an existing base class random number generator. | |
1115 | * @param rng An existing (base class) engine object. | |
1116 | */ | |
1117 | explicit | |
1118 | discard_block(const base_type& __rng) | |
1119 | : _M_b(__rng), _M_n(0) { } | |
1120 | ||
1121 | /** | |
1122 | * Seed constructs a %discard_block engine. | |
1123 | * | |
1124 | * Constructs the underlying generator engine seeded with @p __s. | |
1125 | * @param __s A seed value for the base class engine. | |
1126 | */ | |
1127 | explicit | |
1128 | discard_block(unsigned long __s) | |
1129 | : _M_b(__s), _M_n(0) { } | |
1130 | ||
1131 | /** | |
1132 | * Generator construct a %discard_block engine. | |
1133 | * | |
1134 | * @param __g A seed generator function. | |
1135 | */ | |
1136 | template<class _Gen> | |
1137 | discard_block(_Gen& __g) | |
1138 | : _M_b(__g), _M_n(0) { } | |
1139 | ||
1140 | /** | |
1141 | * Reseeds the %discard_block object with the default seed for the | |
1142 | * underlying base class generator engine. | |
1143 | */ | |
1144 | void seed() | |
1145 | { | |
1146 | _M_b.seed(); | |
1147 | _M_n = 0; | |
1148 | } | |
1149 | ||
1150 | /** | |
1151 | * Reseeds the %discard_block object with the given seed generator | |
1152 | * function. | |
1153 | * @param __g A seed generator function. | |
1154 | */ | |
1155 | template<class _Gen> | |
1156 | void seed(_Gen& __g) | |
1157 | { | |
1158 | _M_b.seed(__g); | |
1159 | _M_n = 0; | |
1160 | } | |
1161 | ||
1162 | /** | |
1163 | * Gets a const reference to the underlying generator engine object. | |
1164 | */ | |
1165 | const base_type& | |
1166 | base() const | |
1167 | { return _M_b; } | |
1168 | ||
1169 | /** | |
1170 | * Gets the minimum value in the generated random number range. | |
1171 | */ | |
1172 | result_type | |
1173 | min() const | |
1174 | { return _M_b.min(); } | |
1175 | ||
1176 | /** | |
1177 | * Gets the maximum value in the generated random number range. | |
1178 | */ | |
1179 | result_type | |
1180 | max() const | |
1181 | { return _M_b.max(); } | |
1182 | ||
1183 | /** | |
1184 | * Gets the next value in the generated random number sequence. | |
1185 | */ | |
1186 | result_type | |
1187 | operator()(); | |
1188 | ||
1189 | /** | |
1190 | * Compares two %discard_block random number generator objects of | |
1191 | * the same type for equality. | |
1192 | * | |
1193 | * @param __lhs A %discard_block random number generator object. | |
1194 | * @param __rhs Another %discard_block random number generator | |
1195 | * object. | |
1196 | * | |
1197 | * @returns true if the two objects are equal, false otherwise. | |
1198 | */ | |
1199 | friend bool | |
1200 | operator==(const discard_block& __lhs, const discard_block& __rhs) | |
1201 | { return (__lhs._M_b == __rhs._M_b) && (__lhs._M_n == __rhs._M_n); } | |
1202 | ||
1203 | /** | |
1204 | * Compares two %discard_block random number generator objects of | |
1205 | * the same type for inequality. | |
1206 | * | |
1207 | * @param __lhs A %discard_block random number generator object. | |
1208 | * @param __rhs Another %discard_block random number generator | |
1209 | * object. | |
1210 | * | |
1211 | * @returns true if the two objects are not equal, false otherwise. | |
1212 | */ | |
1213 | friend bool | |
1214 | operator!=(const discard_block& __lhs, const discard_block& __rhs) | |
1215 | { return !(__lhs == __rhs); } | |
1216 | ||
1217 | /** | |
1218 | * Inserts the current state of a %discard_block random number | |
1219 | * generator engine @p __x into the output stream @p __os. | |
1220 | * | |
1221 | * @param __os An output stream. | |
1222 | * @param __x A %discard_block random number generator engine. | |
1223 | * | |
1224 | * @returns The output stream with the state of @p __x inserted or in | |
1225 | * an error state. | |
1226 | */ | |
1227 | template<class _UniformRandomNumberGenerator1, int __p1, int __r1, | |
1228 | typename _CharT, typename _Traits> | |
1229 | friend std::basic_ostream<_CharT, _Traits>& | |
1230 | operator<<(std::basic_ostream<_CharT, _Traits>& __os, | |
1231 | const discard_block<_UniformRandomNumberGenerator1, | |
1232 | __p1, __r1>& __x); | |
1233 | ||
1234 | /** | |
1235 | * Extracts the current state of a % subtract_with_carry random number | |
1236 | * generator engine @p __x from the input stream @p __is. | |
1237 | * | |
1238 | * @param __is An input stream. | |
1239 | * @param __x A %discard_block random number generator engine. | |
1240 | * | |
1241 | * @returns The input stream with the state of @p __x extracted or in | |
1242 | * an error state. | |
1243 | */ | |
1244 | template<class _UniformRandomNumberGenerator1, int __p1, int __r1, | |
1245 | typename _CharT, typename _Traits> | |
1246 | friend std::basic_istream<_CharT, _Traits>& | |
1247 | operator>>(std::basic_istream<_CharT, _Traits>& __is, | |
1248 | discard_block<_UniformRandomNumberGenerator1, | |
1249 | __p1, __r1>& __x); | |
1250 | ||
1251 | private: | |
1252 | base_type _M_b; | |
1253 | int _M_n; | |
1254 | }; | |
1255 | ||
1256 | ||
1257 | /** | |
1258 | * James's luxury-level-3 integer adaptation of Luescher's generator. | |
1259 | */ | |
1260 | typedef discard_block< | |
1261 | subtract_with_carry<unsigned long, (1UL << 24), 10, 24>, | |
1262 | 223, | |
1263 | 24 | |
1264 | > ranlux3; | |
1265 | ||
1266 | /** | |
1267 | * James's luxury-level-4 integer adaptation of Luescher's generator. | |
1268 | */ | |
1269 | typedef discard_block< | |
1270 | subtract_with_carry<unsigned long, (1UL << 24), 10, 24>, | |
1271 | 389, | |
1272 | 24 | |
1273 | > ranlux4; | |
1274 | ||
1275 | typedef discard_block< | |
1276 | subtract_with_carry_01<float, 24, 10, 24>, | |
1277 | 223, | |
1278 | 24 | |
1279 | > ranlux3_01; | |
1280 | ||
1281 | typedef discard_block< | |
1282 | subtract_with_carry_01<float, 24, 10, 24>, | |
1283 | 389, | |
1284 | 24 | |
1285 | > ranlux4_01; | |
1286 | ||
1287 | ||
1288 | /** | |
1289 | * A random number generator adaptor class that combines two random number | |
1290 | * generator engines into a single output sequence. | |
1291 | */ | |
1292 | template<class _UniformRandomNumberGenerator1, int __s1, | |
1293 | class _UniformRandomNumberGenerator2, int __s2> | |
1294 | class xor_combine | |
1295 | { | |
1296 | // __glibcxx_class_requires(typename _UniformRandomNumberGenerator1:: | |
1297 | // result_type, ArithmeticTypeConcept) | |
1298 | // __glibcxx_class_requires(typename _UniformRandomNumberGenerator2:: | |
1299 | // result_type, ArithmeticTypeConcept) | |
1300 | ||
1301 | public: | |
1302 | /** The type of the first underlying generator engine. */ | |
1303 | typedef _UniformRandomNumberGenerator1 base1_type; | |
1304 | /** The type of the second underlying generator engine. */ | |
1305 | typedef _UniformRandomNumberGenerator2 base2_type; | |
1306 | ||
1307 | private: | |
1308 | typedef typename base1_type::result_type _Result_type1; | |
1309 | typedef typename base2_type::result_type _Result_type2; | |
1310 | ||
1311 | public: | |
1312 | /** The type of the generated random value. */ | |
1313 | typedef typename __gnu_cxx::__conditional_type<(sizeof(_Result_type1) | |
1314 | > sizeof(_Result_type2)), | |
1315 | _Result_type1, _Result_type2>::__type result_type; | |
1316 | ||
1317 | // parameter values | |
1318 | static const int shift1 = __s1; | |
1319 | static const int shift2 = __s2; | |
1320 | ||
1321 | // constructors and member function | |
1322 | xor_combine() | |
1323 | : _M_b1(), _M_b2() | |
1324 | { _M_initialize_max(); } | |
1325 | ||
1326 | xor_combine(const base1_type& __rng1, const base2_type& __rng2) | |
1327 | : _M_b1(__rng1), _M_b2(__rng2) | |
1328 | { _M_initialize_max(); } | |
1329 | ||
1330 | xor_combine(unsigned long __s) | |
1331 | : _M_b1(__s), _M_b2(__s + 1) | |
1332 | { _M_initialize_max(); } | |
1333 | ||
1334 | template<class _Gen> | |
1335 | xor_combine(_Gen& __g) | |
1336 | : _M_b1(__g), _M_b2(__g) | |
1337 | { _M_initialize_max(); } | |
1338 | ||
1339 | void | |
1340 | seed() | |
1341 | { | |
1342 | _M_b1.seed(); | |
1343 | _M_b2.seed(); | |
1344 | } | |
1345 | ||
1346 | template<class _Gen> | |
1347 | void | |
1348 | seed(_Gen& __g) | |
1349 | { | |
1350 | _M_b1.seed(__g); | |
1351 | _M_b2.seed(__g); | |
1352 | } | |
1353 | ||
1354 | const base1_type& | |
1355 | base1() const | |
1356 | { return _M_b1; } | |
1357 | ||
1358 | const base2_type& | |
1359 | base2() const | |
1360 | { return _M_b2; } | |
1361 | ||
1362 | result_type | |
1363 | min() const | |
1364 | { return 0; } | |
1365 | ||
1366 | result_type | |
1367 | max() const | |
1368 | { return _M_max; } | |
1369 | ||
1370 | /** | |
1371 | * Gets the next random number in the sequence. | |
1372 | */ | |
1373 | // NB: Not exactly the TR1 formula, per N2079 instead. | |
1374 | result_type | |
1375 | operator()() | |
1376 | { | |
1377 | return ((result_type(_M_b1() - _M_b1.min()) << shift1) | |
1378 | ^ (result_type(_M_b2() - _M_b2.min()) << shift2)); | |
1379 | } | |
1380 | ||
1381 | /** | |
1382 | * Compares two %xor_combine random number generator objects of | |
1383 | * the same type for equality. | |
1384 | * | |
1385 | * @param __lhs A %xor_combine random number generator object. | |
1386 | * @param __rhs Another %xor_combine random number generator | |
1387 | * object. | |
1388 | * | |
1389 | * @returns true if the two objects are equal, false otherwise. | |
1390 | */ | |
1391 | friend bool | |
1392 | operator==(const xor_combine& __lhs, const xor_combine& __rhs) | |
1393 | { | |
1394 | return (__lhs.base1() == __rhs.base1()) | |
1395 | && (__lhs.base2() == __rhs.base2()); | |
1396 | } | |
1397 | ||
1398 | /** | |
1399 | * Compares two %xor_combine random number generator objects of | |
1400 | * the same type for inequality. | |
1401 | * | |
1402 | * @param __lhs A %xor_combine random number generator object. | |
1403 | * @param __rhs Another %xor_combine random number generator | |
1404 | * object. | |
1405 | * | |
1406 | * @returns true if the two objects are not equal, false otherwise. | |
1407 | */ | |
1408 | friend bool | |
1409 | operator!=(const xor_combine& __lhs, const xor_combine& __rhs) | |
1410 | { return !(__lhs == __rhs); } | |
1411 | ||
1412 | /** | |
1413 | * Inserts the current state of a %xor_combine random number | |
1414 | * generator engine @p __x into the output stream @p __os. | |
1415 | * | |
1416 | * @param __os An output stream. | |
1417 | * @param __x A %xor_combine random number generator engine. | |
1418 | * | |
1419 | * @returns The output stream with the state of @p __x inserted or in | |
1420 | * an error state. | |
1421 | */ | |
1422 | template<class _UniformRandomNumberGenerator11, int __s11, | |
1423 | class _UniformRandomNumberGenerator21, int __s21, | |
1424 | typename _CharT, typename _Traits> | |
1425 | friend std::basic_ostream<_CharT, _Traits>& | |
1426 | operator<<(std::basic_ostream<_CharT, _Traits>& __os, | |
1427 | const xor_combine<_UniformRandomNumberGenerator11, __s11, | |
1428 | _UniformRandomNumberGenerator21, __s21>& __x); | |
1429 | ||
1430 | /** | |
1431 | * Extracts the current state of a %xor_combine random number | |
1432 | * generator engine @p __x from the input stream @p __is. | |
1433 | * | |
1434 | * @param __is An input stream. | |
1435 | * @param __x A %xor_combine random number generator engine. | |
1436 | * | |
1437 | * @returns The input stream with the state of @p __x extracted or in | |
1438 | * an error state. | |
1439 | */ | |
1440 | template<class _UniformRandomNumberGenerator11, int __s11, | |
1441 | class _UniformRandomNumberGenerator21, int __s21, | |
1442 | typename _CharT, typename _Traits> | |
1443 | friend std::basic_istream<_CharT, _Traits>& | |
1444 | operator>>(std::basic_istream<_CharT, _Traits>& __is, | |
1445 | xor_combine<_UniformRandomNumberGenerator11, __s11, | |
1446 | _UniformRandomNumberGenerator21, __s21>& __x); | |
1447 | ||
1448 | private: | |
1449 | void | |
1450 | _M_initialize_max(); | |
1451 | ||
1452 | result_type | |
1453 | _M_initialize_max_aux(result_type, result_type, int); | |
1454 | ||
1455 | base1_type _M_b1; | |
1456 | base2_type _M_b2; | |
1457 | result_type _M_max; | |
1458 | }; | |
1459 | ||
1460 | ||
1461 | /** | |
1462 | * A standard interface to a platform-specific non-deterministic | |
1463 | * random number generator (if any are available). | |
1464 | */ | |
1465 | class random_device | |
1466 | { | |
1467 | public: | |
1468 | // types | |
1469 | typedef unsigned int result_type; | |
1470 | ||
1471 | // constructors, destructors and member functions | |
1472 | ||
1473 | #ifdef _GLIBCXX_USE_RANDOM_TR1 | |
1474 | ||
1475 | explicit | |
1476 | random_device(const std::string& __token = "/dev/urandom") | |
1477 | { | |
1478 | if ((__token != "/dev/urandom" && __token != "/dev/random") | |
1479 | || !(_M_file = std::fopen(__token.c_str(), "rb"))) | |
1480 | std::__throw_runtime_error(__N("random_device::" | |
1481 | "random_device(const std::string&)")); | |
1482 | } | |
1483 | ||
1484 | ~random_device() | |
1485 | { std::fclose(_M_file); } | |
1486 | ||
1487 | #else | |
1488 | ||
1489 | explicit | |
1490 | random_device(const std::string& __token = "mt19937") | |
1491 | : _M_mt(_M_strtoul(__token)) { } | |
1492 | ||
1493 | private: | |
1494 | static unsigned long | |
1495 | _M_strtoul(const std::string& __str) | |
1496 | { | |
1497 | unsigned long __ret = 5489UL; | |
1498 | if (__str != "mt19937") | |
1499 | { | |
1500 | const char* __nptr = __str.c_str(); | |
1501 | char* __endptr; | |
1502 | __ret = std::strtoul(__nptr, &__endptr, 0); | |
1503 | if (*__nptr == '\0' || *__endptr != '\0') | |
1504 | std::__throw_runtime_error(__N("random_device::_M_strtoul" | |
1505 | "(const std::string&)")); | |
1506 | } | |
1507 | return __ret; | |
1508 | } | |
1509 | ||
1510 | public: | |
1511 | ||
1512 | #endif | |
1513 | ||
1514 | result_type | |
1515 | min() const | |
1516 | { return std::numeric_limits<result_type>::min(); } | |
1517 | ||
1518 | result_type | |
1519 | max() const | |
1520 | { return std::numeric_limits<result_type>::max(); } | |
1521 | ||
1522 | double | |
1523 | entropy() const | |
1524 | { return 0.0; } | |
1525 | ||
1526 | result_type | |
1527 | operator()() | |
1528 | { | |
1529 | #ifdef _GLIBCXX_USE_RANDOM_TR1 | |
1530 | result_type __ret; | |
1531 | std::fread(reinterpret_cast<void*>(&__ret), sizeof(result_type), | |
1532 | 1, _M_file); | |
1533 | return __ret; | |
1534 | #else | |
1535 | return _M_mt(); | |
1536 | #endif | |
1537 | } | |
1538 | ||
1539 | private: | |
1540 | random_device(const random_device&); | |
1541 | void operator=(const random_device&); | |
1542 | ||
1543 | #ifdef _GLIBCXX_USE_RANDOM_TR1 | |
1544 | FILE* _M_file; | |
1545 | #else | |
1546 | mt19937 _M_mt; | |
1547 | #endif | |
1548 | }; | |
1549 | ||
1550 | /* @} */ // group tr1_random_generators | |
1551 | ||
1552 | /** | |
1553 | * @addtogroup tr1_random_distributions Random Number Distributions | |
1554 | * @ingroup tr1_random | |
1555 | * @{ | |
1556 | */ | |
1557 | ||
1558 | /** | |
1559 | * @addtogroup tr1_random_distributions_discrete Discrete Distributions | |
1560 | * @ingroup tr1_random_distributions | |
1561 | * @{ | |
1562 | */ | |
1563 | ||
1564 | /** | |
1565 | * @brief Uniform discrete distribution for random numbers. | |
1566 | * A discrete random distribution on the range @f$[min, max]@f$ with equal | |
1567 | * probability throughout the range. | |
1568 | */ | |
1569 | template<typename _IntType = int> | |
1570 | class uniform_int | |
1571 | { | |
1572 | __glibcxx_class_requires(_IntType, _IntegerConcept) | |
1573 | ||
1574 | public: | |
1575 | /** The type of the parameters of the distribution. */ | |
1576 | typedef _IntType input_type; | |
1577 | /** The type of the range of the distribution. */ | |
1578 | typedef _IntType result_type; | |
1579 | ||
1580 | public: | |
1581 | /** | |
1582 | * Constructs a uniform distribution object. | |
1583 | */ | |
1584 | explicit | |
1585 | uniform_int(_IntType __min = 0, _IntType __max = 9) | |
1586 | : _M_min(__min), _M_max(__max) | |
1587 | { | |
1588 | _GLIBCXX_DEBUG_ASSERT(_M_min <= _M_max); | |
1589 | } | |
1590 | ||
1591 | /** | |
1592 | * Gets the inclusive lower bound of the distribution range. | |
1593 | */ | |
1594 | result_type | |
1595 | min() const | |
1596 | { return _M_min; } | |
1597 | ||
1598 | /** | |
1599 | * Gets the inclusive upper bound of the distribution range. | |
1600 | */ | |
1601 | result_type | |
1602 | max() const | |
1603 | { return _M_max; } | |
1604 | ||
1605 | /** | |
1606 | * Resets the distribution state. | |
1607 | * | |
1608 | * Does nothing for the uniform integer distribution. | |
1609 | */ | |
1610 | void | |
1611 | reset() { } | |
1612 | ||
1613 | /** | |
1614 | * Gets a uniformly distributed random number in the range | |
1615 | * @f$(min, max)@f$. | |
1616 | */ | |
1617 | template<typename _UniformRandomNumberGenerator> | |
1618 | result_type | |
1619 | operator()(_UniformRandomNumberGenerator& __urng) | |
1620 | { | |
1621 | typedef typename _UniformRandomNumberGenerator::result_type | |
1622 | _UResult_type; | |
1623 | return _M_call(__urng, _M_min, _M_max, | |
1624 | typename is_integral<_UResult_type>::type()); | |
1625 | } | |
1626 | ||
1627 | /** | |
1628 | * Gets a uniform random number in the range @f$[0, n)@f$. | |
1629 | * | |
1630 | * This function is aimed at use with std::random_shuffle. | |
1631 | */ | |
1632 | template<typename _UniformRandomNumberGenerator> | |
1633 | result_type | |
1634 | operator()(_UniformRandomNumberGenerator& __urng, result_type __n) | |
1635 | { | |
1636 | typedef typename _UniformRandomNumberGenerator::result_type | |
1637 | _UResult_type; | |
1638 | return _M_call(__urng, 0, __n - 1, | |
1639 | typename is_integral<_UResult_type>::type()); | |
1640 | } | |
1641 | ||
1642 | /** | |
1643 | * Inserts a %uniform_int random number distribution @p __x into the | |
1644 | * output stream @p os. | |
1645 | * | |
1646 | * @param __os An output stream. | |
1647 | * @param __x A %uniform_int random number distribution. | |
1648 | * | |
1649 | * @returns The output stream with the state of @p __x inserted or in | |
1650 | * an error state. | |
1651 | */ | |
1652 | template<typename _IntType1, typename _CharT, typename _Traits> | |
1653 | friend std::basic_ostream<_CharT, _Traits>& | |
1654 | operator<<(std::basic_ostream<_CharT, _Traits>& __os, | |
1655 | const uniform_int<_IntType1>& __x); | |
1656 | ||
1657 | /** | |
1658 | * Extracts a %uniform_int random number distribution | |
1659 | * @p __x from the input stream @p __is. | |
1660 | * | |
1661 | * @param __is An input stream. | |
1662 | * @param __x A %uniform_int random number generator engine. | |
1663 | * | |
1664 | * @returns The input stream with @p __x extracted or in an error state. | |
1665 | */ | |
1666 | template<typename _IntType1, typename _CharT, typename _Traits> | |
1667 | friend std::basic_istream<_CharT, _Traits>& | |
1668 | operator>>(std::basic_istream<_CharT, _Traits>& __is, | |
1669 | uniform_int<_IntType1>& __x); | |
1670 | ||
1671 | private: | |
1672 | template<typename _UniformRandomNumberGenerator> | |
1673 | result_type | |
1674 | _M_call(_UniformRandomNumberGenerator& __urng, | |
1675 | result_type __min, result_type __max, true_type); | |
1676 | ||
1677 | template<typename _UniformRandomNumberGenerator> | |
1678 | result_type | |
1679 | _M_call(_UniformRandomNumberGenerator& __urng, | |
1680 | result_type __min, result_type __max, false_type) | |
1681 | { | |
1682 | return result_type((__urng() - __urng.min()) | |
1683 | / (__urng.max() - __urng.min()) | |
1684 | * (__max - __min + 1)) + __min; | |
1685 | } | |
1686 | ||
1687 | _IntType _M_min; | |
1688 | _IntType _M_max; | |
1689 | }; | |
1690 | ||
1691 | ||
1692 | /** | |
1693 | * @brief A Bernoulli random number distribution. | |
1694 | * | |
1695 | * Generates a sequence of true and false values with likelihood @f$ p @f$ | |
1696 | * that true will come up and @f$ (1 - p) @f$ that false will appear. | |
1697 | */ | |
1698 | class bernoulli_distribution | |
1699 | { | |
1700 | public: | |
1701 | typedef int input_type; | |
1702 | typedef bool result_type; | |
1703 | ||
1704 | public: | |
1705 | /** | |
1706 | * Constructs a Bernoulli distribution with likelihood @p p. | |
1707 | * | |
1708 | * @param __p [IN] The likelihood of a true result being returned. Must | |
1709 | * be in the interval @f$ [0, 1] @f$. | |
1710 | */ | |
1711 | explicit | |
1712 | bernoulli_distribution(double __p = 0.5) | |
1713 | : _M_p(__p) | |
1714 | { | |
1715 | _GLIBCXX_DEBUG_ASSERT((_M_p >= 0.0) && (_M_p <= 1.0)); | |
1716 | } | |
1717 | ||
1718 | /** | |
1719 | * Gets the @p p parameter of the distribution. | |
1720 | */ | |
1721 | double | |
1722 | p() const | |
1723 | { return _M_p; } | |
1724 | ||
1725 | /** | |
1726 | * Resets the distribution state. | |
1727 | * | |
1728 | * Does nothing for a Bernoulli distribution. | |
1729 | */ | |
1730 | void | |
1731 | reset() { } | |
1732 | ||
1733 | /** | |
1734 | * Gets the next value in the Bernoullian sequence. | |
1735 | */ | |
1736 | template<class _UniformRandomNumberGenerator> | |
1737 | result_type | |
1738 | operator()(_UniformRandomNumberGenerator& __urng) | |
1739 | { | |
1740 | if ((__urng() - __urng.min()) < _M_p * (__urng.max() - __urng.min())) | |
1741 | return true; | |
1742 | return false; | |
1743 | } | |
1744 | ||
1745 | /** | |
1746 | * Inserts a %bernoulli_distribution random number distribution | |
1747 | * @p __x into the output stream @p __os. | |
1748 | * | |
1749 | * @param __os An output stream. | |
1750 | * @param __x A %bernoulli_distribution random number distribution. | |
1751 | * | |
1752 | * @returns The output stream with the state of @p __x inserted or in | |
1753 | * an error state. | |
1754 | */ | |
1755 | template<typename _CharT, typename _Traits> | |
1756 | friend std::basic_ostream<_CharT, _Traits>& | |
1757 | operator<<(std::basic_ostream<_CharT, _Traits>& __os, | |
1758 | const bernoulli_distribution& __x); | |
1759 | ||
1760 | /** | |
1761 | * Extracts a %bernoulli_distribution random number distribution | |
1762 | * @p __x from the input stream @p __is. | |
1763 | * | |
1764 | * @param __is An input stream. | |
1765 | * @param __x A %bernoulli_distribution random number generator engine. | |
1766 | * | |
1767 | * @returns The input stream with @p __x extracted or in an error state. | |
1768 | */ | |
1769 | template<typename _CharT, typename _Traits> | |
1770 | friend std::basic_istream<_CharT, _Traits>& | |
1771 | operator>>(std::basic_istream<_CharT, _Traits>& __is, | |
1772 | bernoulli_distribution& __x) | |
1773 | { return __is >> __x._M_p; } | |
1774 | ||
1775 | private: | |
1776 | double _M_p; | |
1777 | }; | |
1778 | ||
1779 | ||
1780 | /** | |
1781 | * @brief A discrete geometric random number distribution. | |
1782 | * | |
1783 | * The formula for the geometric probability mass function is | |
1784 | * @f$ p(i) = (1 - p)p^{i-1} @f$ where @f$ p @f$ is the parameter of the | |
1785 | * distribution. | |
1786 | */ | |
1787 | template<typename _IntType = int, typename _RealType = double> | |
1788 | class geometric_distribution | |
1789 | { | |
1790 | public: | |
1791 | // types | |
1792 | typedef _RealType input_type; | |
1793 | typedef _IntType result_type; | |
1794 | ||
1795 | // constructors and member function | |
1796 | explicit | |
1797 | geometric_distribution(const _RealType& __p = _RealType(0.5)) | |
1798 | : _M_p(__p) | |
1799 | { | |
1800 | _GLIBCXX_DEBUG_ASSERT((_M_p > 0.0) && (_M_p < 1.0)); | |
1801 | _M_initialize(); | |
1802 | } | |
1803 | ||
1804 | /** | |
1805 | * Gets the distribution parameter @p p. | |
1806 | */ | |
1807 | _RealType | |
1808 | p() const | |
1809 | { return _M_p; } | |
1810 | ||
1811 | void | |
1812 | reset() { } | |
1813 | ||
1814 | template<class _UniformRandomNumberGenerator> | |
1815 | result_type | |
1816 | operator()(_UniformRandomNumberGenerator& __urng); | |
1817 | ||
1818 | /** | |
1819 | * Inserts a %geometric_distribution random number distribution | |
1820 | * @p __x into the output stream @p __os. | |
1821 | * | |
1822 | * @param __os An output stream. | |
1823 | * @param __x A %geometric_distribution random number distribution. | |
1824 | * | |
1825 | * @returns The output stream with the state of @p __x inserted or in | |
1826 | * an error state. | |
1827 | */ | |
1828 | template<typename _IntType1, typename _RealType1, | |
1829 | typename _CharT, typename _Traits> | |
1830 | friend std::basic_ostream<_CharT, _Traits>& | |
1831 | operator<<(std::basic_ostream<_CharT, _Traits>& __os, | |
1832 | const geometric_distribution<_IntType1, _RealType1>& __x); | |
1833 | ||
1834 | /** | |
1835 | * Extracts a %geometric_distribution random number distribution | |
1836 | * @p __x from the input stream @p __is. | |
1837 | * | |
1838 | * @param __is An input stream. | |
1839 | * @param __x A %geometric_distribution random number generator engine. | |
1840 | * | |
1841 | * @returns The input stream with @p __x extracted or in an error state. | |
1842 | */ | |
1843 | template<typename _CharT, typename _Traits> | |
1844 | friend std::basic_istream<_CharT, _Traits>& | |
1845 | operator>>(std::basic_istream<_CharT, _Traits>& __is, | |
1846 | geometric_distribution& __x) | |
1847 | { | |
1848 | __is >> __x._M_p; | |
1849 | __x._M_initialize(); | |
1850 | return __is; | |
1851 | } | |
1852 | ||
1853 | private: | |
1854 | void | |
1855 | _M_initialize() | |
1856 | { _M_log_p = std::log(_M_p); } | |
1857 | ||
1858 | _RealType _M_p; | |
1859 | _RealType _M_log_p; | |
1860 | }; | |
1861 | ||
1862 | ||
1863 | template<typename _RealType> | |
1864 | class normal_distribution; | |
1865 | ||
1866 | /** | |
1867 | * @brief A discrete Poisson random number distribution. | |
1868 | * | |
1869 | * The formula for the Poisson probability mass function is | |
1870 | * @f$ p(i) = \frac{mean^i}{i!} e^{-mean} @f$ where @f$ mean @f$ is the | |
1871 | * parameter of the distribution. | |
1872 | */ | |
1873 | template<typename _IntType = int, typename _RealType = double> | |
1874 | class poisson_distribution | |
1875 | { | |
1876 | public: | |
1877 | // types | |
1878 | typedef _RealType input_type; | |
1879 | typedef _IntType result_type; | |
1880 | ||
1881 | // constructors and member function | |
1882 | explicit | |
1883 | poisson_distribution(const _RealType& __mean = _RealType(1)) | |
1884 | : _M_mean(__mean), _M_nd() | |
1885 | { | |
1886 | _GLIBCXX_DEBUG_ASSERT(_M_mean > 0.0); | |
1887 | _M_initialize(); | |
1888 | } | |
1889 | ||
1890 | /** | |
1891 | * Gets the distribution parameter @p mean. | |
1892 | */ | |
1893 | _RealType | |
1894 | mean() const | |
1895 | { return _M_mean; } | |
1896 | ||
1897 | void | |
1898 | reset() | |
1899 | { _M_nd.reset(); } | |
1900 | ||
1901 | template<class _UniformRandomNumberGenerator> | |
1902 | result_type | |
1903 | operator()(_UniformRandomNumberGenerator& __urng); | |
1904 | ||
1905 | /** | |
1906 | * Inserts a %poisson_distribution random number distribution | |
1907 | * @p __x into the output stream @p __os. | |
1908 | * | |
1909 | * @param __os An output stream. | |
1910 | * @param __x A %poisson_distribution random number distribution. | |
1911 | * | |
1912 | * @returns The output stream with the state of @p __x inserted or in | |
1913 | * an error state. | |
1914 | */ | |
1915 | template<typename _IntType1, typename _RealType1, | |
1916 | typename _CharT, typename _Traits> | |
1917 | friend std::basic_ostream<_CharT, _Traits>& | |
1918 | operator<<(std::basic_ostream<_CharT, _Traits>& __os, | |
1919 | const poisson_distribution<_IntType1, _RealType1>& __x); | |
1920 | ||
1921 | /** | |
1922 | * Extracts a %poisson_distribution random number distribution | |
1923 | * @p __x from the input stream @p __is. | |
1924 | * | |
1925 | * @param __is An input stream. | |
1926 | * @param __x A %poisson_distribution random number generator engine. | |
1927 | * | |
1928 | * @returns The input stream with @p __x extracted or in an error state. | |
1929 | */ | |
1930 | template<typename _IntType1, typename _RealType1, | |
1931 | typename _CharT, typename _Traits> | |
1932 | friend std::basic_istream<_CharT, _Traits>& | |
1933 | operator>>(std::basic_istream<_CharT, _Traits>& __is, | |
1934 | poisson_distribution<_IntType1, _RealType1>& __x); | |
1935 | ||
1936 | private: | |
1937 | void | |
1938 | _M_initialize(); | |
1939 | ||
1940 | // NB: Unused when _GLIBCXX_USE_C99_MATH_TR1 is undefined. | |
1941 | normal_distribution<_RealType> _M_nd; | |
1942 | ||
1943 | _RealType _M_mean; | |
1944 | ||
1945 | // Hosts either log(mean) or the threshold of the simple method. | |
1946 | _RealType _M_lm_thr; | |
1947 | #if _GLIBCXX_USE_C99_MATH_TR1 | |
1948 | _RealType _M_lfm, _M_sm, _M_d, _M_scx, _M_1cx, _M_c2b, _M_cb; | |
1949 | #endif | |
1950 | }; | |
1951 | ||
1952 | ||
1953 | /** | |
1954 | * @brief A discrete binomial random number distribution. | |
1955 | * | |
1956 | * The formula for the binomial probability mass function is | |
1957 | * @f$ p(i) = \binom{n}{i} p^i (1 - p)^{t - i} @f$ where @f$ t @f$ | |
1958 | * and @f$ p @f$ are the parameters of the distribution. | |
1959 | */ | |
1960 | template<typename _IntType = int, typename _RealType = double> | |
1961 | class binomial_distribution | |
1962 | { | |
1963 | public: | |
1964 | // types | |
1965 | typedef _RealType input_type; | |
1966 | typedef _IntType result_type; | |
1967 | ||
1968 | // constructors and member function | |
1969 | explicit | |
1970 | binomial_distribution(_IntType __t = 1, | |
1971 | const _RealType& __p = _RealType(0.5)) | |
1972 | : _M_t(__t), _M_p(__p), _M_nd() | |
1973 | { | |
1974 | _GLIBCXX_DEBUG_ASSERT((_M_t >= 0) && (_M_p >= 0.0) && (_M_p <= 1.0)); | |
1975 | _M_initialize(); | |
1976 | } | |
1977 | ||
1978 | /** | |
1979 | * Gets the distribution @p t parameter. | |
1980 | */ | |
1981 | _IntType | |
1982 | t() const | |
1983 | { return _M_t; } | |
1984 | ||
1985 | /** | |
1986 | * Gets the distribution @p p parameter. | |
1987 | */ | |
1988 | _RealType | |
1989 | p() const | |
1990 | { return _M_p; } | |
1991 | ||
1992 | void | |
1993 | reset() | |
1994 | { _M_nd.reset(); } | |
1995 | ||
1996 | template<class _UniformRandomNumberGenerator> | |
1997 | result_type | |
1998 | operator()(_UniformRandomNumberGenerator& __urng); | |
1999 | ||
2000 | /** | |
2001 | * Inserts a %binomial_distribution random number distribution | |
2002 | * @p __x into the output stream @p __os. | |
2003 | * | |
2004 | * @param __os An output stream. | |
2005 | * @param __x A %binomial_distribution random number distribution. | |
2006 | * | |
2007 | * @returns The output stream with the state of @p __x inserted or in | |
2008 | * an error state. | |
2009 | */ | |
2010 | template<typename _IntType1, typename _RealType1, | |
2011 | typename _CharT, typename _Traits> | |
2012 | friend std::basic_ostream<_CharT, _Traits>& | |
2013 | operator<<(std::basic_ostream<_CharT, _Traits>& __os, | |
2014 | const binomial_distribution<_IntType1, _RealType1>& __x); | |
2015 | ||
2016 | /** | |
2017 | * Extracts a %binomial_distribution random number distribution | |
2018 | * @p __x from the input stream @p __is. | |
2019 | * | |
2020 | * @param __is An input stream. | |
2021 | * @param __x A %binomial_distribution random number generator engine. | |
2022 | * | |
2023 | * @returns The input stream with @p __x extracted or in an error state. | |
2024 | */ | |
2025 | template<typename _IntType1, typename _RealType1, | |
2026 | typename _CharT, typename _Traits> | |
2027 | friend std::basic_istream<_CharT, _Traits>& | |
2028 | operator>>(std::basic_istream<_CharT, _Traits>& __is, | |
2029 | binomial_distribution<_IntType1, _RealType1>& __x); | |
2030 | ||
2031 | private: | |
2032 | void | |
2033 | _M_initialize(); | |
2034 | ||
2035 | template<class _UniformRandomNumberGenerator> | |
2036 | result_type | |
2037 | _M_waiting(_UniformRandomNumberGenerator& __urng, _IntType __t); | |
2038 | ||
2039 | // NB: Unused when _GLIBCXX_USE_C99_MATH_TR1 is undefined. | |
2040 | normal_distribution<_RealType> _M_nd; | |
2041 | ||
2042 | _RealType _M_q; | |
2043 | #if _GLIBCXX_USE_C99_MATH_TR1 | |
2044 | _RealType _M_d1, _M_d2, _M_s1, _M_s2, _M_c, | |
2045 | _M_a1, _M_a123, _M_s, _M_lf, _M_lp1p; | |
2046 | #endif | |
2047 | _RealType _M_p; | |
2048 | _IntType _M_t; | |
2049 | ||
2050 | bool _M_easy; | |
2051 | }; | |
2052 | ||
2053 | /* @} */ // group tr1_random_distributions_discrete | |
2054 | ||
2055 | /** | |
2056 | * @addtogroup tr1_random_distributions_continuous Continuous Distributions | |
2057 | * @ingroup tr1_random_distributions | |
2058 | * @{ | |
2059 | */ | |
2060 | ||
2061 | /** | |
2062 | * @brief Uniform continuous distribution for random numbers. | |
2063 | * | |
2064 | * A continuous random distribution on the range [min, max) with equal | |
2065 | * probability throughout the range. The URNG should be real-valued and | |
2066 | * deliver number in the range [0, 1). | |
2067 | */ | |
2068 | template<typename _RealType = double> | |
2069 | class uniform_real | |
2070 | { | |
2071 | public: | |
2072 | // types | |
2073 | typedef _RealType input_type; | |
2074 | typedef _RealType result_type; | |
2075 | ||
2076 | public: | |
2077 | /** | |
2078 | * Constructs a uniform_real object. | |
2079 | * | |
2080 | * @param __min [IN] The lower bound of the distribution. | |
2081 | * @param __max [IN] The upper bound of the distribution. | |
2082 | */ | |
2083 | explicit | |
2084 | uniform_real(_RealType __min = _RealType(0), | |
2085 | _RealType __max = _RealType(1)) | |
2086 | : _M_min(__min), _M_max(__max) | |
2087 | { | |
2088 | _GLIBCXX_DEBUG_ASSERT(_M_min <= _M_max); | |
2089 | } | |
2090 | ||
2091 | result_type | |
2092 | min() const | |
2093 | { return _M_min; } | |
2094 | ||
2095 | result_type | |
2096 | max() const | |
2097 | { return _M_max; } | |
2098 | ||
2099 | void | |
2100 | reset() { } | |
2101 | ||
2102 | template<class _UniformRandomNumberGenerator> | |
2103 | result_type | |
2104 | operator()(_UniformRandomNumberGenerator& __urng) | |
2105 | { return (__urng() * (_M_max - _M_min)) + _M_min; } | |
2106 | ||
2107 | /** | |
2108 | * Inserts a %uniform_real random number distribution @p __x into the | |
2109 | * output stream @p __os. | |
2110 | * | |
2111 | * @param __os An output stream. | |
2112 | * @param __x A %uniform_real random number distribution. | |
2113 | * | |
2114 | * @returns The output stream with the state of @p __x inserted or in | |
2115 | * an error state. | |
2116 | */ | |
2117 | template<typename _RealType1, typename _CharT, typename _Traits> | |
2118 | friend std::basic_ostream<_CharT, _Traits>& | |
2119 | operator<<(std::basic_ostream<_CharT, _Traits>& __os, | |
2120 | const uniform_real<_RealType1>& __x); | |
2121 | ||
2122 | /** | |
2123 | * Extracts a %uniform_real random number distribution | |
2124 | * @p __x from the input stream @p __is. | |
2125 | * | |
2126 | * @param __is An input stream. | |
2127 | * @param __x A %uniform_real random number generator engine. | |
2128 | * | |
2129 | * @returns The input stream with @p __x extracted or in an error state. | |
2130 | */ | |
2131 | template<typename _RealType1, typename _CharT, typename _Traits> | |
2132 | friend std::basic_istream<_CharT, _Traits>& | |
2133 | operator>>(std::basic_istream<_CharT, _Traits>& __is, | |
2134 | uniform_real<_RealType1>& __x); | |
2135 | ||
2136 | private: | |
2137 | _RealType _M_min; | |
2138 | _RealType _M_max; | |
2139 | }; | |
2140 | ||
2141 | ||
2142 | /** | |
2143 | * @brief An exponential continuous distribution for random numbers. | |
2144 | * | |
2145 | * The formula for the exponential probability mass function is | |
2146 | * @f$ p(x) = \lambda e^{-\lambda x} @f$. | |
2147 | * | |
2148 | * <table border=1 cellpadding=10 cellspacing=0> | |
2149 | * <caption align=top>Distribution Statistics</caption> | |
2150 | * <tr><td>Mean</td><td>@f$ \frac{1}{\lambda} @f$</td></tr> | |
2151 | * <tr><td>Median</td><td>@f$ \frac{\ln 2}{\lambda} @f$</td></tr> | |
2152 | * <tr><td>Mode</td><td>@f$ zero @f$</td></tr> | |
2153 | * <tr><td>Range</td><td>@f$[0, \infty]@f$</td></tr> | |
2154 | * <tr><td>Standard Deviation</td><td>@f$ \frac{1}{\lambda} @f$</td></tr> | |
2155 | * </table> | |
2156 | */ | |
2157 | template<typename _RealType = double> | |
2158 | class exponential_distribution | |
2159 | { | |
2160 | public: | |
2161 | // types | |
2162 | typedef _RealType input_type; | |
2163 | typedef _RealType result_type; | |
2164 | ||
2165 | public: | |
2166 | /** | |
2167 | * Constructs an exponential distribution with inverse scale parameter | |
2168 | * @f$ \lambda @f$. | |
2169 | */ | |
2170 | explicit | |
2171 | exponential_distribution(const result_type& __lambda = result_type(1)) | |
2172 | : _M_lambda(__lambda) | |
2173 | { | |
2174 | _GLIBCXX_DEBUG_ASSERT(_M_lambda > 0); | |
2175 | } | |
2176 | ||
2177 | /** | |
2178 | * Gets the inverse scale parameter of the distribution. | |
2179 | */ | |
2180 | _RealType | |
2181 | lambda() const | |
2182 | { return _M_lambda; } | |
2183 | ||
2184 | /** | |
2185 | * Resets the distribution. | |
2186 | * | |
2187 | * Has no effect on exponential distributions. | |
2188 | */ | |
2189 | void | |
2190 | reset() { } | |
2191 | ||
2192 | template<class _UniformRandomNumberGenerator> | |
2193 | result_type | |
2194 | operator()(_UniformRandomNumberGenerator& __urng) | |
2195 | { return -std::log(__urng()) / _M_lambda; } | |
2196 | ||
2197 | /** | |
2198 | * Inserts a %exponential_distribution random number distribution | |
2199 | * @p __x into the output stream @p __os. | |
2200 | * | |
2201 | * @param __os An output stream. | |
2202 | * @param __x A %exponential_distribution random number distribution. | |
2203 | * | |
2204 | * @returns The output stream with the state of @p __x inserted or in | |
2205 | * an error state. | |
2206 | */ | |
2207 | template<typename _RealType1, typename _CharT, typename _Traits> | |
2208 | friend std::basic_ostream<_CharT, _Traits>& | |
2209 | operator<<(std::basic_ostream<_CharT, _Traits>& __os, | |
2210 | const exponential_distribution<_RealType1>& __x); | |
2211 | ||
2212 | /** | |
2213 | * Extracts a %exponential_distribution random number distribution | |
2214 | * @p __x from the input stream @p __is. | |
2215 | * | |
2216 | * @param __is An input stream. | |
2217 | * @param __x A %exponential_distribution random number | |
2218 | * generator engine. | |
2219 | * | |
2220 | * @returns The input stream with @p __x extracted or in an error state. | |
2221 | */ | |
2222 | template<typename _CharT, typename _Traits> | |
2223 | friend std::basic_istream<_CharT, _Traits>& | |
2224 | operator>>(std::basic_istream<_CharT, _Traits>& __is, | |
2225 | exponential_distribution& __x) | |
2226 | { return __is >> __x._M_lambda; } | |
2227 | ||
2228 | private: | |
2229 | result_type _M_lambda; | |
2230 | }; | |
2231 | ||
2232 | ||
2233 | /** | |
2234 | * @brief A normal continuous distribution for random numbers. | |
2235 | * | |
2236 | * The formula for the normal probability mass function is | |
2237 | * @f$ p(x) = \frac{1}{\sigma \sqrt{2 \pi}} | |
2238 | * e^{- \frac{{x - mean}^ {2}}{2 \sigma ^ {2}} } @f$. | |
2239 | */ | |
2240 | template<typename _RealType = double> | |
2241 | class normal_distribution | |
2242 | { | |
2243 | public: | |
2244 | // types | |
2245 | typedef _RealType input_type; | |
2246 | typedef _RealType result_type; | |
2247 | ||
2248 | public: | |
2249 | /** | |
2250 | * Constructs a normal distribution with parameters @f$ mean @f$ and | |
2251 | * @f$ \sigma @f$. | |
2252 | */ | |
2253 | explicit | |
2254 | normal_distribution(const result_type& __mean = result_type(0), | |
2255 | const result_type& __sigma = result_type(1)) | |
2256 | : _M_mean(__mean), _M_sigma(__sigma), _M_saved_available(false) | |
2257 | { | |
2258 | _GLIBCXX_DEBUG_ASSERT(_M_sigma > 0); | |
2259 | } | |
2260 | ||
2261 | /** | |
2262 | * Gets the mean of the distribution. | |
2263 | */ | |
2264 | _RealType | |
2265 | mean() const | |
2266 | { return _M_mean; } | |
2267 | ||
2268 | /** | |
2269 | * Gets the @f$ \sigma @f$ of the distribution. | |
2270 | */ | |
2271 | _RealType | |
2272 | sigma() const | |
2273 | { return _M_sigma; } | |
2274 | ||
2275 | /** | |
2276 | * Resets the distribution. | |
2277 | */ | |
2278 | void | |
2279 | reset() | |
2280 | { _M_saved_available = false; } | |
2281 | ||
2282 | template<class _UniformRandomNumberGenerator> | |
2283 | result_type | |
2284 | operator()(_UniformRandomNumberGenerator& __urng); | |
2285 | ||
2286 | /** | |
2287 | * Inserts a %normal_distribution random number distribution | |
2288 | * @p __x into the output stream @p __os. | |
2289 | * | |
2290 | * @param __os An output stream. | |
2291 | * @param __x A %normal_distribution random number distribution. | |
2292 | * | |
2293 | * @returns The output stream with the state of @p __x inserted or in | |
2294 | * an error state. | |
2295 | */ | |
2296 | template<typename _RealType1, typename _CharT, typename _Traits> | |
2297 | friend std::basic_ostream<_CharT, _Traits>& | |
2298 | operator<<(std::basic_ostream<_CharT, _Traits>& __os, | |
2299 | const normal_distribution<_RealType1>& __x); | |
2300 | ||
2301 | /** | |
2302 | * Extracts a %normal_distribution random number distribution | |
2303 | * @p __x from the input stream @p __is. | |
2304 | * | |
2305 | * @param __is An input stream. | |
2306 | * @param __x A %normal_distribution random number generator engine. | |
2307 | * | |
2308 | * @returns The input stream with @p __x extracted or in an error state. | |
2309 | */ | |
2310 | template<typename _RealType1, typename _CharT, typename _Traits> | |
2311 | friend std::basic_istream<_CharT, _Traits>& | |
2312 | operator>>(std::basic_istream<_CharT, _Traits>& __is, | |
2313 | normal_distribution<_RealType1>& __x); | |
2314 | ||
2315 | private: | |
2316 | result_type _M_mean; | |
2317 | result_type _M_sigma; | |
2318 | result_type _M_saved; | |
2319 | bool _M_saved_available; | |
2320 | }; | |
2321 | ||
2322 | ||
2323 | /** | |
2324 | * @brief A gamma continuous distribution for random numbers. | |
2325 | * | |
2326 | * The formula for the gamma probability mass function is | |
2327 | * @f$ p(x) = \frac{1}{\Gamma(\alpha)} x^{\alpha - 1} e^{-x} @f$. | |
2328 | */ | |
2329 | template<typename _RealType = double> | |
2330 | class gamma_distribution | |
2331 | { | |
2332 | public: | |
2333 | // types | |
2334 | typedef _RealType input_type; | |
2335 | typedef _RealType result_type; | |
2336 | ||
2337 | public: | |
2338 | /** | |
2339 | * Constructs a gamma distribution with parameters @f$ \alpha @f$. | |
2340 | */ | |
2341 | explicit | |
2342 | gamma_distribution(const result_type& __alpha_val = result_type(1)) | |
2343 | : _M_alpha(__alpha_val) | |
2344 | { | |
2345 | _GLIBCXX_DEBUG_ASSERT(_M_alpha > 0); | |
2346 | _M_initialize(); | |
2347 | } | |
2348 | ||
2349 | /** | |
2350 | * Gets the @f$ \alpha @f$ of the distribution. | |
2351 | */ | |
2352 | _RealType | |
2353 | alpha() const | |
2354 | { return _M_alpha; } | |
2355 | ||
2356 | /** | |
2357 | * Resets the distribution. | |
2358 | */ | |
2359 | void | |
2360 | reset() { } | |
2361 | ||
2362 | template<class _UniformRandomNumberGenerator> | |
2363 | result_type | |
2364 | operator()(_UniformRandomNumberGenerator& __urng); | |
2365 | ||
2366 | /** | |
2367 | * Inserts a %gamma_distribution random number distribution | |
2368 | * @p __x into the output stream @p __os. | |
2369 | * | |
2370 | * @param __os An output stream. | |
2371 | * @param __x A %gamma_distribution random number distribution. | |
2372 | * | |
2373 | * @returns The output stream with the state of @p __x inserted or in | |
2374 | * an error state. | |
2375 | */ | |
2376 | template<typename _RealType1, typename _CharT, typename _Traits> | |
2377 | friend std::basic_ostream<_CharT, _Traits>& | |
2378 | operator<<(std::basic_ostream<_CharT, _Traits>& __os, | |
2379 | const gamma_distribution<_RealType1>& __x); | |
2380 | ||
2381 | /** | |
2382 | * Extracts a %gamma_distribution random number distribution | |
2383 | * @p __x from the input stream @p __is. | |
2384 | * | |
2385 | * @param __is An input stream. | |
2386 | * @param __x A %gamma_distribution random number generator engine. | |
2387 | * | |
2388 | * @returns The input stream with @p __x extracted or in an error state. | |
2389 | */ | |
2390 | template<typename _CharT, typename _Traits> | |
2391 | friend std::basic_istream<_CharT, _Traits>& | |
2392 | operator>>(std::basic_istream<_CharT, _Traits>& __is, | |
2393 | gamma_distribution& __x) | |
2394 | { | |
2395 | __is >> __x._M_alpha; | |
2396 | __x._M_initialize(); | |
2397 | return __is; | |
2398 | } | |
2399 | ||
2400 | private: | |
2401 | void | |
2402 | _M_initialize(); | |
2403 | ||
2404 | result_type _M_alpha; | |
2405 | ||
2406 | // Hosts either lambda of GB or d of modified Vaduva's. | |
2407 | result_type _M_l_d; | |
2408 | }; | |
2409 | ||
2410 | /* @} */ // group tr1_random_distributions_continuous | |
2411 | /* @} */ // group tr1_random_distributions | |
2412 | /* @} */ // group tr1_random | |
2948dd21 | 2413 | _GLIBCXX_END_NAMESPACE_VERSION |
fca66f47 | 2414 | } |
2415 | } | |
2416 | ||
fca66f47 | 2417 | #endif // _GLIBCXX_TR1_RANDOM_H |