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| 55 | #endif |
55 | #endif |
| 56 | |
56 | |
| 57 | // use C0X decltype for auto declarations until ISO C++ sanctifies them (if ever) |
57 | // use C0X decltype for auto declarations until ISO C++ sanctifies them (if ever) |
| 58 | #define auto(var,expr) decltype(expr) var = (expr) |
58 | #define auto(var,expr) decltype(expr) var = (expr) |
| 59 | |
59 | |
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60 | // could use the sizeof (arr) /( sizeof (arr [0]) here, but C++ is |
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61 | // much more obfuscated... :) |
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62 | |
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63 | template<typename T, int N> |
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64 | inline int array_length (const T (&arr)[N]) |
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65 | { |
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66 | return N; |
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67 | } |
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68 | |
| 60 | // very ugly macro that basically declares and initialises a variable |
69 | // very ugly macro that basically declares and initialises a variable |
| 61 | // that is in scope for the next statement only |
70 | // that is in scope for the next statement only |
| 62 | // works only for stuff that can be assigned 0 and converts to false |
71 | // works only for stuff that can be assigned 0 and converts to false |
| 63 | // (note: works great for pointers) |
72 | // (note: works great for pointers) |
| 64 | // most ugly macro I ever wrote |
73 | // most ugly macro I ever wrote |
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| 98 | inline sint8 sign (sint8 v) { return 1 - (sint8 (uint8 (v) >> 7) * 2); } |
107 | inline sint8 sign (sint8 v) { return 1 - (sint8 (uint8 (v) >> 7) * 2); } |
| 99 | |
108 | |
| 100 | // sign0 returns -1, 0 or +1 |
109 | // sign0 returns -1, 0 or +1 |
| 101 | template<typename T> |
110 | template<typename T> |
| 102 | static inline T sign0 (T v) { return v ? sign (v) : 0; } |
111 | static inline T sign0 (T v) { return v ? sign (v) : 0; } |
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112 | |
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113 | template<typename T, typename U> |
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114 | static inline T copysign (T a, U b) { return a > 0 ? b : -b; } |
| 103 | |
115 | |
| 104 | // div* only work correctly for div > 0 |
116 | // div* only work correctly for div > 0 |
| 105 | // div, with correct rounding (< 0.5 downwards, >=0.5 upwards) |
117 | // div, with correct rounding (< 0.5 downwards, >=0.5 upwards) |
| 106 | template<typename T> static inline T div (T val, T div) |
118 | template<typename T> static inline T div (T val, T div) |
| 107 | { |
119 | { |
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| 467 | return !is_constant (num) ? get_range (num) // non-constant |
479 | return !is_constant (num) ? get_range (num) // non-constant |
| 468 | : num & (num - 1) ? (this->next () * (uint64_t)num) >> 32U // constant, non-power-of-two |
480 | : num & (num - 1) ? (this->next () * (uint64_t)num) >> 32U // constant, non-power-of-two |
| 469 | : this->next () & (num - 1); // constant, power-of-two |
481 | : this->next () & (num - 1); // constant, power-of-two |
| 470 | } |
482 | } |
| 471 | |
483 | |
| 472 | // return a number within (min .. max) |
484 | // return a number within the closed interval [min .. max] |
| 473 | int operator () (int r_min, int r_max) |
485 | int operator () (int r_min, int r_max) |
| 474 | { |
486 | { |
| 475 | return is_constant (r_min) && is_constant (r_max) && r_min <= r_max |
487 | return is_constant (r_min) && is_constant (r_max) && r_min <= r_max |
| 476 | ? r_min + operator ()(r_max - r_min + 1) |
488 | ? r_min + operator ()(r_max - r_min + 1) |
| 477 | : get_range (r_min, r_max); |
489 | : get_range (r_min, r_max); |
| 478 | } |
490 | } |
| 479 | |
491 | |
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492 | // return a number within the closed interval [0..1] |
| 480 | double operator ()() |
493 | double operator ()() |
| 481 | { |
494 | { |
| 482 | return this->next () / (double)0xFFFFFFFFU; |
495 | return this->next () / (double)0xFFFFFFFFU; |
| 483 | } |
496 | } |
| 484 | |
497 | |
