iab_gpp 0.1.2

IAB GPP Consent String implementation
Documentation 
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use num_traits::One;
use num_traits::ops::checked::CheckedAdd;

/// Iterative generic fibonacci implementation
pub struct Fibonacci<T> {
    curr: T,
    next: Option<T>,
}

impl<T> Iterator for Fibonacci<T>
where
    T: CheckedAdd + Copy,
{
    type Item = T;

    fn next(&mut self) -> Option<T> {
        let curr = self.next?;
        self.next = self.curr.checked_add(&curr);
        self.curr = curr;

        Some(self.curr)
    }
}

/// Create a new Iterative fibonacci.
pub fn fibonacci_iterator<T>() -> Fibonacci<T>
where
    T: One + Copy,
{
    let init = T::one();
    Fibonacci {
        curr: init,
        next: Some(init),
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn sequence_is_correct() {
        assert_eq!(
            fibonacci_iterator::<u16>().take(16).collect::<Vec<_>>(),
            vec![
                1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610, 987, 1597
            ]
        );
    }

    #[test]
    fn u8_overflow() {
        assert_eq!(
            fibonacci_iterator::<u8>().collect::<Vec<_>>(),
            vec![1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233]
        );
    }
}