fn merge_iters<()

in common/rusty_leveldb_sgx/src/version_set.rs [909:949]

• 37 lines of code
• 8 McCabe index (conditional complexity)

fn merge_iters<
    Item,
    C: Fn(&Item, &Item) -> Ordering,
    I: Iterator<Item = Item>,
    J: Iterator<Item = Item>,
>(
    mut iter_a: I,
    mut iter_b: J,
    cmp: C,
) -> Vec<Item> {
    let mut a = iter_a.next();
    let mut b = iter_b.next();
    let mut out = vec![];
    while a.is_some() && b.is_some() {
        let ord = cmp(a.as_ref().unwrap(), b.as_ref().unwrap());
        if ord == Ordering::Less {
            out.push(a.unwrap());
            a = iter_a.next();
        } else {
            out.push(b.unwrap());
            b = iter_b.next();
        }
    }

    // Push cached elements.
    if let Some(a_) = a {
        out.push(a_);
    }
    if let Some(b_) = b {
        out.push(b_);
    }

    // Push remaining elements from either iterator.
    for a in iter_a {
        out.push(a);
    }
    for b in iter_b {
        out.push(b);
    }
    out
}