LRUCache tweak - make mutex mutable, allowing const functions

- Note: this is common practice, mutexes alone don't change state of the object on lock
astibal · Apr 20, 2024 · 47ea9f0 · 47ea9f0
1 parent 955be2a
commit 47ea9f0
Showing 1 changed file with 3 additions and 3 deletions.
diff --git a/src/utils/lru.hpp b/src/utils/lru.hpp
@@ -11,12 +11,12 @@ class LRUCache {
     std::unordered_map<Key, std::pair<Value, typename std::list<Key>::iterator>> cache_;
     std::list<Key> lruList;
 
-    std::mutex lock_;
+    mutable std::mutex lock_;
 public:
     explicit LRUCache(size_t cap) : capacity_(cap) {}
-    std::mutex& lock() { return lock_; }
+    std::mutex& lock() const { return lock_; }
 
-    auto const& get_map_ul() {
+    auto const& get_map_ul() const {
         return cache_;
     }