Function isPrime

src/backend/common/dispatch.hpp:25–34

// itk::Math::{IsPrimt, GreatestPrimeFactor}
template<typename T>
inline bool isPrime(T n) {
    if (n <= 1) return false;

    const T last{(T)std::sqrt((double)n)};
    for (T x{2}; x <= last; ++x) {
        if (n % x == 0) return false;
    }

    return true;
}

template<typename T>
inline T greatestPrimeFactor(T n) {