//! Assignment 7: Mastering advanced types (2/2).
//!
//! The primary goal of this assignment is to understand generics, traits, and lifetimes.
//!
//! You should fill out the `todo!()` placeholders in such a way that `/scripts/grade-07.sh` works fine.
//! See `assignment07_grade.rs` and `/scripts/grade-07.sh` for the test script.

struct FindIter<'s, T: Eq> {
    query: &'s [T],
    base: &'s [T],
    curr: usize,
}

impl<T: Eq> Iterator for FindIter<'_, T> {
    type Item = usize;

    fn next(&mut self) -> Option<Self::Item> {
        todo!()
    }
}

/// Returns an iterator over substring query indexes in the base.
pub fn find<'s, T: Eq>(query: &'s [T], base: &'s [T]) -> impl 's + Iterator<Item = usize> {
    FindIter {
        query,
        base,
        curr: 0,
    }
}