Encapsulate cache locking code

day_07/src/equation/operator_set.rs

@@ -7,6 +7,17 @@ type OperatorCache = HashMap<usize, HashSet<Vec<bool>>>;
 static OPERATOR_SET_CACHE: LazyLock<Mutex<OperatorCache>> =
     LazyLock::new(|| Mutex::new(HashMap::new()));
 
+fn check_operator_set_cache(cache_key: usize) -> Option<HashSet<Vec<bool>>> {
+    OPERATOR_SET_CACHE.lock().unwrap().get(&cache_key).cloned()
+}
+
+fn store_operator_set_in_cache(cache_key: usize, cache_value: HashSet<Vec<bool>>) {
+    OPERATOR_SET_CACHE
+        .lock()
+        .unwrap()
+        .insert(cache_key, cache_value);
+}
+
 fn create_operator_set_recurse(
     operators_permutation_set: &mut HashSet<Vec<bool>>,
     operators: Vec<bool>,
@@ -27,20 +38,16 @@ fn create_operator_set_recurse(
 }
 
 pub fn create_operator_set(num_of_operators: usize) -> HashSet<Vec<bool>> {
-    {
     // Check cache
-        if let Some(cached_value) = OPERATOR_SET_CACHE.lock().unwrap().get(&num_of_operators) {
+    if let Some(cached_value) = check_operator_set_cache(num_of_operators) {
         return cached_value.clone();
     }
-    }
+
     let mut operator_sets: HashSet<Vec<bool>> = HashSet::new();
     create_operator_set_recurse(&mut operator_sets, vec![false; num_of_operators]);
-    {
+
     // Store value in cache
-        OPERATOR_SET_CACHE
-            .lock()
-            .unwrap()
-            .insert(num_of_operators, operator_sets.clone());
-    }
+    store_operator_set_in_cache(num_of_operators, operator_sets.clone());
+
     operator_sets
 }