pub struct CursorList<T, C> {
    pub items: Vec<T>,
    pub next_cursor: Option<C>,
}

pub trait AsCursor<C> {
    fn cursor(&self) -> C;
}

impl<T: AsCursor<C>, C> CursorList<T, C> {
    pub fn new(items: Vec<T>, limit: usize) -> Self {
        CursorList {
            next_cursor: items.get(limit - 1).map(|x| x.cursor()),
            items,
        }
    }
}