From 4486beab7beb6a80ba6a89bfa73c0fbc9708ca74 Mon Sep 17 00:00:00 2001
From: chai <chaifix@163.com>
Date: Thu, 6 Dec 2018 17:26:07 +0800
Subject: *singleton

---
 src/libjin/common/je_singleton.hpp | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

(limited to 'src/libjin/common/je_singleton.hpp')

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
 
-- 
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