| … | |
… | |
| 429 | { |
429 | { |
| 430 | p->~Tp (); |
430 | p->~Tp (); |
| 431 | } |
431 | } |
| 432 | }; |
432 | }; |
| 433 | |
433 | |
| 434 | // P. L'Ecuyer, “Maximally Equidistributed Combined Tausworthe Generators”, Mathematics of Computation, 65, 213 (1996), 203–213. |
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| 435 | // http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme.ps |
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| 436 | // http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme2.ps |
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| 437 | struct tausworthe_random_generator |
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| 438 | { |
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| 439 | uint32_t state [4]; |
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| 440 | |
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| 441 | void operator =(const tausworthe_random_generator &src) |
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| 442 | { |
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| 443 | state [0] = src.state [0]; |
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| 444 | state [1] = src.state [1]; |
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| 445 | state [2] = src.state [2]; |
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| 446 | state [3] = src.state [3]; |
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| 447 | } |
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| 448 | |
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| 449 | void seed (uint32_t seed); |
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| 450 | uint32_t next (); |
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| 451 | }; |
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| 452 | |
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| 453 | // Xorshift RNGs, George Marsaglia |
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| 454 | // http://www.jstatsoft.org/v08/i14/paper |
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| 455 | // this one is about 40% faster than the tausworthe one above (i.e. not much), |
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| 456 | // despite the inlining, and has the issue of only creating 2**32-1 numbers. |
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| 457 | // see also http://www.iro.umontreal.ca/~lecuyer/myftp/papers/xorshift.pdf |
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| 458 | struct xorshift_random_generator |
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| 459 | { |
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| 460 | uint32_t x, y; |
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| 461 | |
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| 462 | void operator =(const xorshift_random_generator &src) |
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| 463 | { |
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| 464 | x = src.x; |
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| 465 | y = src.y; |
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| 466 | } |
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| 467 | |
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| 468 | void seed (uint32_t seed) |
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| 469 | { |
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| 470 | x = seed; |
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| 471 | y = seed * 69069U; |
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| 472 | } |
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| 473 | |
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| 474 | uint32_t next () |
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| 475 | { |
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| 476 | uint32_t t = x ^ (x << 10); |
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| 477 | x = y; |
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| 478 | y = y ^ (y >> 13) ^ t ^ (t >> 10); |
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| 479 | return y; |
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| 480 | } |
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| 481 | }; |
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| 482 | |
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| 483 | template<class generator> |
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| 484 | struct random_number_generator : generator |
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| 485 | { |
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| 486 | // uniform distribution, [0 .. num - 1] |
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| 487 | uint32_t operator ()(uint32_t num) |
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| 488 | { |
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| 489 | return !is_constant (num) ? get_range (num) // non-constant |
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| 490 | : num & (num - 1) ? (this->next () * (uint64_t)num) >> 32U // constant, non-power-of-two |
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| 491 | : this->next () & (num - 1); // constant, power-of-two |
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| 492 | } |
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| 493 | |
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| 494 | // return a number within the closed interval [min .. max], max can be >, < or == min. |
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| 495 | int operator () (int r_min, int r_max) |
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| 496 | { |
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| 497 | return is_constant (r_min <= r_max) && r_min <= r_max |
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| 498 | ? r_min + operator ()(r_max - r_min + 1) |
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| 499 | : get_range (r_min, r_max); |
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| 500 | } |
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| 501 | |
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| 502 | // return a number within the half-open interval [0..1[ |
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| 503 | double operator ()() |
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| 504 | { |
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| 505 | return this->next () / (double)0x100000000ULL; |
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| 506 | } |
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| 507 | |
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| 508 | protected: |
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| 509 | uint32_t get_range (uint32_t r_max); |
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| 510 | int get_range (int r_min, int r_max); |
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| 511 | }; |
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| 512 | |
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| 513 | typedef random_number_generator<tausworthe_random_generator> rand_gen; |
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| 514 | |
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| 515 | extern rand_gen rndm, rmg_rndm; |
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| 516 | |
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| 517 | INTERFACE_CLASS (attachable) |
434 | INTERFACE_CLASS (attachable) |
| 518 | struct refcnt_base |
435 | struct refcnt_base |
| 519 | { |
436 | { |
| 520 | typedef int refcnt_t; |
437 | typedef int refcnt_t; |
| 521 | mutable refcnt_t ACC (RW, refcnt); |
438 | mutable refcnt_t ACC (RW, refcnt); |
