lockfree hashmap minor modification (at instead of operator[])

data_structures/map/hashmap.hpp

@@ -10,9 +10,11 @@ namespace lockfree
 {
 
 template <class K, class V>
-class HashMap: Lockable<SpinLock> {
+class HashMap: Lockable<SpinLock> 
+{
 public:
-    V operator[](const K& key)
+
+    V at(const K& key)
     {
         auto guard = acquire();
 

test/lockfree_hashmap.cpp

@@ -4,7 +4,6 @@
 TEST_CASE("Lockfree HashMap basic functionality")
 {
     lockfree::HashMap<int, int> hashmap;
-    // hashmap[32] = 10;
     hashmap.put(32, 10);
-    REQUIRE(hashmap[32] == 10);
+    REQUIRE(hashmap.at(32) == 10);
 }