...

examples/hmap_example.cpp

@@ -96,5 +96,24 @@ int main()
         }
     }
 
+    std::println("\n{:*^80}", " delete key ");
+
+    std::println("erase node with key 'int_key'");
+    if (hmap_move.erase("int_key")) {
+        auto ri = hmap_move.get<int>("int_key");
+        if (ri) {  // should not be
+            std::println("hmap_move['int_key'] = {}", ri.value());
+        } else {
+            std::println("cannot get value of hmap_move['int_key']");
+        }
+
+        ri = hmap_copy.get<int>("int_key");
+        if (ri) {
+            std::println("hmap_copy['int_key'] = {}", ri.value());
+        } else {
+            std::println("cannot get value of hmap_copy['int_key']");
+        }
+    }
+
     return 0;
 }