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Created Jul 19, 2015
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C++ template to generate a magic mask with alternating runs of 0s & 1s
#include <cstdint>
template <typename T>
inline T magic_mask(int_fast8_t n) {
T base = T(1)<<(int_fast16_t(1)<<n);
return (~T(0))/(base*base-1)*(base-1);
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