Method intern

crates/environ/src/component/dfg.rs:1267–1281

Helper function to manage interning of results to avoid duplicate initializers being inserted into the final list. `key` - the key being referenced which is used to deduplicate. `map` - a closure to access the interning map on `Self` `gen` - a closure to generate an intermediate value with `Self` from `K`. This is only used if `key` hasn't previously been seen. This closure can recursively intern

(
        &mut self,
        key: K,
        map: impl Fn(&mut Self) -> &mut HashMap<K, V>,
        generate: impl FnOnce(&mut Self, K) -> T,
        init: impl FnOnce(V, T) -> GlobalInitializer,
    

    /// initializers on-demand and avoid pushing more than one initializer at a
    /// time.
    fn intern<K, V, T>(
        &mut self,
        key: K,
        map: impl Fn(&mut Self) -> &mut HashMap<K, V>,
        generate: impl FnOnce(&mut Self, K) -> T,
        init: impl FnOnce(V, T) -> GlobalInitializer,
    ) -> V
    where
        K: Hash + Eq + Copy,
        V: EntityRef,
    {
        self.intern_(key, map, generate, |me, key, val| {
            me.initializers.push(init(key, val));
        })
    }

    fn intern_no_init<K, V, T>(
        &mut self,