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DeimosProject · Mar 30, 2016 · 50b884c · 50b884c
1 parent c0956b5
commit 50b884c
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Showing 2 changed files with 6 additions and 3 deletions.
diff --git a/src/Deimos/Expressions/Parenthesis.php b/src/Deimos/Expressions/Parenthesis.php
@@ -17,5 +17,10 @@ public function isOpen()
     {
         return $this->storage === '(';
     }
+
+    public function operate(\SplStack $stack)
+    {
+        // TODO: Implement operate() method.
+    }
 
 }
diff --git a/src/Deimos/TerminalExpression.php b/src/Deimos/TerminalExpression.php
@@ -73,9 +73,7 @@ public static function factory($storage)
     /**
      * @param \SplStack $stack
      */
-    public function operate(\SplStack $stack)
-    {
-    }
+    abstract public function operate(\SplStack $stack);
 
     /**
      * @return mixed