1 files changed, 9 insertions, 7 deletions
diff --git a/src/libjin/common/je_singleton.hpp b/src/libjin/common/je_singleton.hpp
index ba13b80..51dc9c5 100644
--- a/src/libjin/common/je_singleton.hpp
+++ b/src/libjin/common/je_singleton.hpp
@@ -2,6 +2,7 @@
 #define __JE_SINGLETON_H__
 
 #include "je_object.h"
+#include "je_exception.h"
 
 namespace JinEngine
 {
@@ -38,7 +39,12 @@ namespace JinEngine
         ///
         /// Singleton constructor.
         ///
-        Singleton() {};
+        Singleton() 
+        {
+            // Check singleton.
+            if (_instance)
+                throw Exception("This is a singleton.");
+        };
 
         ///
         /// Singleton destructor.
@@ -70,12 +76,8 @@ namespace JinEngine
     ///
     /// Singleton instance.
     ///
-    template<class T> T* Singleton<T>::_instance = nullptr;
-
-    ///
-    /// Singleton notation.
-    ///
-    #define singleton(T) friend Singleton<T>
+    template<class T> 
+    T* Singleton<T>::_instance = nullptr;
 
 } // namespace JinEngine