Method or_insert_with

crates/firewheel-core/src/node.rs:1121–1126

(self, default: impl FnOnce() -> S)

    ///
    /// Returns `None` if the given resource does not exist.
    pub fn try_get<S: Send + 'static>(&self) -> Option<&S> {
        self.0
            .get(&TypeId::of::<S>())
            .map(|s| s.downcast_ref().unwrap())
    }

    /// Get a mutable reference to a resource in the store.
    ///
    /// Returns `None` if the given resource does not exist.