I did it!!! 😃

include/AbstractState.h

@@ -139,48 +139,53 @@ public: // everything is public, because IDGAF
     // Loop through all 16 sets
     for (int Index = 0; Index < 16; Index++) {
 
-      // create a temporary set of associativity
-      struct Set temp_set;
       struct Set current_set = Sets[Index];
       struct Set incoming_set = In.Sets[Index];
 
-      // loop through all Ages
-      for (auto associativity_map : current_set.Associativity) {
+      // create a temporary set of associativity
+      struct Set temp_set;
+      temp_set.Associativity = {{(unsigned int)0, {{}}},
+                                {(unsigned int)1, {{}}},
+                                {(unsigned int)2, {{}}},
+                                {(unsigned int)3, {{}}}};
+
+      int new_age = 0;
+
+      // loop through all Ages
+      for (int current_age = 0; current_age < 4; current_age++) {
+
+        std::list<unsigned int> new_block_list;
+
+        auto current_age_entry = current_set.Associativity[current_age];
+        std::list<unsigned int> current_age_blocklist =
+            current_age_entry.Blocks;
 
-        auto current_associativity_age = associativity_map.first;
-        std::list<unsigned int> current_associativity_blocklist =
-            associativity_map.second.Blocks;
         // for every element of associativity_block_list
-        for (auto block : current_associativity_blocklist) {
-          // look through ALL incoming_set.Associativities.Entry.Blocklists for
-          // occurrences
+        for (auto block : current_age_blocklist) {
+          // look through ALL incoming_set.Blocklists for occurrences
           for (auto incoming_associativity : incoming_set.Associativity) {
-            auto age = incoming_associativity.first;
+            int age = incoming_associativity.first;
             struct Entry entry = incoming_associativity.second;
 
             auto ret =
                 std::find(entry.Blocks.begin(), entry.Blocks.end(), block);
-            if (ret != entry.Blocks.end()) {
+            if (ret !=
+                entry.Blocks.end()) { // if current block found amongst incoming
 
-              // take the maximum age
-              auto new_age = std::max(current_associativity_age, age);
+              // compare the ages and take the maximum age
+              new_age = std::max(current_age, age);
 
-              // create a new entry at the maximum age and
-              std::list<unsigned int> new_block_list;
-              new_block_list.push_back((unsigned int) *ret);
-              struct Entry new_entry = {new_block_list};
-
-              // add it to temporary set
-              temp_set.Associativity.insert(
-                  std::pair<unsigned int, struct Entry>(new_age, new_entry));
+              new_block_list.push_front((unsigned int)*ret);
             }
           }
-        }
-        // print_block_list(associativity_age, associativity_block_list);
+          // update the temporary
+          temp_set.Associativity[new_age].Blocks.merge(new_block_list);
 
           Sets[Index] = temp_set;
         }
       }
+      // Here should be Sets[Index] = temp_set;
+    }
   }
 
   /**