dsalgo 0.3.10

A package for Datastructures and Algorithms.
Documentation 
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use crate::bit_length_with_count_leading_zeros_u64::bit_length;

pub fn next_power_of_2(n: u64) -> u64 {
    if n == 0 {
        1
    } else {
        1 << bit_length(n - 1)
    }
}

#[cfg(test)]

mod tests {

    use super::*;

    #[test]

    fn test() {
        use crate::next_power_of_2_table_const_usize::NEXT_POWER_OF_2;

        for (i, &ans) in NEXT_POWER_OF_2.iter().enumerate() {
            assert_eq!(next_power_of_2(i as u64) as usize, ans);
        }
    }
}