pub mod get_iter;
pub mod indexed;
pub mod mut_iter;

use crate::GraphEngine;


/// # Arguments
///
/// * `index`:
///
/// returns: Option<Cow<Self::Node>>
///
/// # Examples
///
/// ```
/// use graph_theory::GraphEngine;
/// ```
pub trait Node {
    /// # Arguments
    ///
    /// * `index`:
    ///
    /// returns: Option<Cow<Self::Node>>
    ///
    /// # Examples
    ///
    /// ```
    /// use graph_theory::GraphEngine;
    /// ```
    fn index(&self) -> usize;
}