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@ -476,7 +476,7 @@ template<typename T> static inline bool IS_INSIDE_1D(const T x, const int base,
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* @param b The denominator of the fraction, must of course not be null
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* @return True in (a/b) percent
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*/
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#define CHANCE16(a, b) ((uint16)Random() <= (uint16)((65536 * (a)) / (b)))
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#define CHANCE16(a, b) CHANCE16I(a, b, Random())
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/**
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* Flips a coin with a given probability and saves the randomize-number in a variable.
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@ -484,18 +484,25 @@ template<typename T> static inline bool IS_INSIDE_1D(const T x, const int base,
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* This macro uses the same parameters as the CHANCE16 marco. The third parameter
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* must be a variable the randomize-number from Random() is saved in.
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*
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* The low 16 bits of r will already be used and can therefor not be passed to
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* CHANCE16I. One can only send the high 16 bits to CHANCE16I.
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*
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* @param a The numerator of the fraction, see CHANCE16
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* @param b The denominator of the fraction, see CHANCE16
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* @param r The variable to save the randomize-number from Random()
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* @return True in (a/b) percent
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*/
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#define CHANCE16R(a, b, r) ((uint16)(r = Random()) <= (uint16)((65536 * (a)) / (b)))
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#define CHANCE16R(a, b, r) CHANCE16I(a, b, r = Random())
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/**
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* Checks if a given randomize-number is below a given probability.
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*
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* This macro is used to check if the given probability by the fraction of (a/b)
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* is greater than the given randomize-number v.
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* is greater than low 16 bits of the given randomize-number v.
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*
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* Do not use this function twice on the same random 16 bits as it will yield
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* the same result. One can use a random number for two calls to CHANCE16I,
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* where one call sends the low 16 bits and the other the high 16 bits.
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*
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* @param a The numerator of the fraction, see CHANCE16
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* @param b The denominator of the fraction, see CHANCE16
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@ -504,7 +511,7 @@ template<typename T> static inline bool IS_INSIDE_1D(const T x, const int base,
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*/
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static inline bool CHANCE16I(const uint a, const uint b, const uint32 r)
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{
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return (uint16)r <= (uint16)((65536 * a) / b);
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return (uint16)r < (uint16)((65536 * a) / b);
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}
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