| … | |
… | |
| 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) |
| … | |
… | |
| 121 | // div, with correct rounding (< 0.5 downwards, >=0.5 upwards) |
123 | // div, with correct rounding (< 0.5 downwards, >=0.5 upwards) |
| 122 | template<typename T> static inline T div (T val, T div) |
124 | template<typename T> static inline T div (T val, T div) |
| 123 | { |
125 | { |
| 124 | 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; |
| 125 | } |
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 | |
| 126 | // div, round-up |
132 | // div, round-up |
| 127 | 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) |
| 128 | { |
134 | { |
| 129 | return expect_false (val < 0) ? - ((-val ) / div) : (val + div - 1) / div; |
135 | return expect_false (val < 0) ? - ((-val ) / div) : (val + div - 1) / div; |
| 130 | } |
136 | } |
