powi.hpp

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#pragma once
 
#ifndef __NVCC__
#   define __host__
#   define __device__
#endif
 
template<typename Integer1, typename Integer2>
static inline __host__ __device__ Integer1 powi(Integer1 base, Integer2 exponent) {
    if(exponent == 0) return 1;
    if(exponent == 1) return base;
 
    Integer1 temp = powi(base, exponent / 2);
    if(exponent % 2 == 0) return temp * temp;
    else return base * temp * temp;
}