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use std::fmt;
use std::rc::Rc;

/// A History Listener to manage callbacks registered on a [`History`][crate::History].
///
/// This Listener has the same behaviour as the [`EventListener`][gloo_events::EventListener] from
/// `gloo` that the underlying callback will be unregistered when the listener is dropped.
#[must_use = "the listener is removed when `HistoryListener` is dropped"]
pub struct HistoryListener {
    pub(crate) _listener: Rc<dyn Fn()>,
}

impl fmt::Debug for HistoryListener {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        f.debug_struct("HistoryListener").finish()
    }
}