From 8b00d67febf133e89f6a0bfabc41feed555dc4a9 Mon Sep 17 00:00:00 2001
From: chai <chaifix@163.com>
Date: Sat, 12 Jan 2019 21:48:33 +0800
Subject: =?UTF-8?q?*=E5=8E=BB=E6=8E=89=E6=96=87=E4=BB=B6=E5=89=8D=E7=BC=80?=
 =?UTF-8?q?je=5F?=
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---
 src/libjin/common/singleton.hpp | 84 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 84 insertions(+)
 create mode 100644 src/libjin/common/singleton.hpp

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

diff --git a/src/libjin/common/singleton.hpp b/src/libjin/common/singleton.hpp
new file mode 100644
index 0000000..015c9b0
--- /dev/null
+++ b/src/libjin/common/singleton.hpp
@@ -0,0 +1,84 @@
+#ifndef __JE_SINGLETON_H__
+#define __JE_SINGLETON_H__
+
+#include "object.h"
+#include "exception.h"
+
+namespace JinEngine
+{
+
+    ///
+    /// Singleton base class.
+    ///
+    template<class T>
+    class Singleton : public Object
+    {
+    public:
+        ///
+        /// Get singleton. 
+        /// 
+        /// @param Singleton instance of class.
+        ///
+        static T* get()
+        {
+            if (_instance == nullptr)
+                _instance = new T;
+            return _instance;
+        }
+
+        ///
+        /// Destroy instance of singleton.
+        ///
+        static void destroy()
+        {
+            delete _instance;
+            _instance = nullptr;
+        }
+
+    protected:
+        ///
+        /// Singleton constructor.
+        ///
+        Singleton() 
+        {
+            // Check singleton.
+            if (_instance)
+                throw Exception("This is a singleton.");
+        };
+
+        ///
+        /// Singleton destructor.
+        ///
+        virtual ~Singleton() {};
+
+        ///
+        /// Singleton instance.
+        ///
+        static T* _instance;
+
+    private:
+        ///
+        /// Singleton copy constructor.
+        ///
+        /// @param singleton Singleton of class.
+        ///
+        Singleton(const Singleton& singleton);
+
+        ///
+        /// Singleton assignment.
+        ///
+        /// @param singleton Singleton of class.
+        ///
+        Singleton& operator = (const Singleton& singleton);
+
+    };
+
+    ///
+    /// Singleton instance.
+    ///
+    template<class T> 
+    T* Singleton<T>::_instance = nullptr;
+
+} // namespace JinEngine
+
+#endif // __JE_SINGLETON_H__
\ No newline at end of file
-- 
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