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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 | |
60 | // could use the sizeof (arr) /( sizeof (arr [0]) here, but C++ is |
60 | #if cplusplus_does_not_suck |
61 | // much more obfuscated... :) |
61 | // does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) |
62 | |
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63 | template<typename T, int N> |
62 | template<typename T, int N> |
64 | inline int array_length (const T (&arr)[N]) |
63 | static inline int array_length (const T (&arr)[N]) |
65 | { |
64 | { |
66 | return N; |
65 | return N; |
67 | } |
66 | } |
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67 | #else |
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68 | #define array_length(name) (sizeof (name) / sizeof (name [0])) |
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69 | #endif |
68 | |
70 | |
69 | // very ugly macro that basically declares and initialises a variable |
71 | // very ugly macro that basically declares and initialises a variable |
70 | // that is in scope for the next statement only |
72 | // that is in scope for the next statement only |
71 | // works only for stuff that can be assigned 0 and converts to false |
73 | // works only for stuff that can be assigned 0 and converts to false |
72 | // (note: works great for pointers) |
74 | // (note: works great for pointers) |
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102 | // sign returns -1 or +1 |
104 | // sign returns -1 or +1 |
103 | template<typename T> |
105 | template<typename T> |
104 | static inline T sign (T v) { return v < 0 ? -1 : +1; } |
106 | static inline T sign (T v) { return v < 0 ? -1 : +1; } |
105 | // relies on 2c representation |
107 | // relies on 2c representation |
106 | template<> |
108 | template<> |
107 | inline sint8 sign (sint8 v) { return 1 - (sint8 (uint8 (v) >> 7) * 2); } |
109 | inline sint8 sign (sint8 v) { return 1 - (sint8 (uint8 (v) >> 7) * 2); } |
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110 | template<> |
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111 | inline sint16 sign (sint16 v) { return 1 - (sint16 (uint16 (v) >> 15) * 2); } |
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112 | template<> |
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113 | inline sint32 sign (sint32 v) { return 1 - (sint32 (uint32 (v) >> 31) * 2); } |
108 | |
114 | |
109 | // sign0 returns -1, 0 or +1 |
115 | // sign0 returns -1, 0 or +1 |
110 | template<typename T> |
116 | template<typename T> |
111 | static inline T sign0 (T v) { return v ? sign (v) : 0; } |
117 | static inline T sign0 (T v) { return v ? sign (v) : 0; } |
112 | |
118 | |
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117 | // div, with correct rounding (< 0.5 downwards, >=0.5 upwards) |
123 | // div, with correct rounding (< 0.5 downwards, >=0.5 upwards) |
118 | template<typename T> static inline T div (T val, T div) |
124 | template<typename T> static inline T div (T val, T div) |
119 | { |
125 | { |
120 | return expect_false (val < 0) ? - ((-val + (div - 1) / 2) / div) : (val + div / 2) / div; |
126 | return expect_false (val < 0) ? - ((-val + (div - 1) / 2) / div) : (val + div / 2) / div; |
121 | } |
127 | } |
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128 | |
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129 | template<> inline float div (float val, float div) { return val / div; } |
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130 | template<> inline double div (double val, double div) { return val / div; } |
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131 | |
122 | // div, round-up |
132 | // div, round-up |
123 | template<typename T> static inline T div_ru (T val, T div) |
133 | template<typename T> static inline T div_ru (T val, T div) |
124 | { |
134 | { |
125 | return expect_false (val < 0) ? - ((-val ) / div) : (val + div - 1) / div; |
135 | return expect_false (val < 0) ? - ((-val ) / div) : (val + div - 1) / div; |
126 | } |
136 | } |
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482 | } |
492 | } |
483 | |
493 | |
484 | // return a number within the closed interval [min .. max] |
494 | // return a number within the closed interval [min .. max] |
485 | int operator () (int r_min, int r_max) |
495 | int operator () (int r_min, int r_max) |
486 | { |
496 | { |
487 | return is_constant (r_min) && is_constant (r_max) && r_min <= r_max |
497 | return is_constant (r_min <= r_max) && r_min <= r_max |
488 | ? r_min + operator ()(r_max - r_min + 1) |
498 | ? r_min + operator ()(r_max - r_min + 1) |
489 | : get_range (r_min, r_max); |
499 | : get_range (r_min, r_max); |
490 | } |
500 | } |
491 | |
501 | |
492 | // return a number within the closed interval [0..1] |
502 | // return a number within the closed interval [0..1] |