From 250e30d73f09e9da2b5a81d0fbae63744ae12a73 Mon Sep 17 00:00:00 2001
From: chai <chaifix@163.com>
Date: Tue, 2 Apr 2019 08:47:15 +0800
Subject: *misc

---
 source/libs/asura-lib-utils/singleton.hpp | 59 +++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)
 create mode 100644 source/libs/asura-lib-utils/singleton.hpp

(limited to 'source/libs/asura-lib-utils/singleton.hpp')

diff --git a/source/libs/asura-lib-utils/singleton.hpp b/source/libs/asura-lib-utils/singleton.hpp
new file mode 100644
index 0000000..0d2777e
--- /dev/null
+++ b/source/libs/asura-lib-utils/singleton.hpp
@@ -0,0 +1,59 @@
+#ifndef __ASURA_SINGLETON_H__
+#define __ASURA_SINGLETON_H__
+
+#include "utils_config.h"
+
+namespace AsuraEngine
+{
+
+	///
+	/// 继承Singleton的类在第一次实例化时保存实例，之后如果再次实例化会报错。
+	/// 
+	template<class T>
+	class Singleton
+	{
+	public:
+
+		static T* Get()
+		{
+			// 如果之前没有创建，在这里立即创建一个并保存
+			if (!instance) instance = new T;
+			// 返回实例
+			return instance;
+		}
+
+		static void Destroy()
+		{
+			delete instance;
+			instance = nullptr;
+		}
+
+	protected:
+
+		Singleton()
+		{
+			// 如果有instance，意味着又创建了一个实例，这是错误的。
+			ASSERT(!instance);
+			// 否则，将本实体作为实例
+			instance = static_cast<T*>(this);
+		};
+
+		virtual ~Singleton() {};
+
+		static T* instance;
+
+	private:
+
+		Singleton(const Singleton& singleton);
+
+		Singleton& operator = (const Singleton& singleton);
+
+	};
+
+	// 实例初始化为空
+	template<class T>
+	T* Singleton<T>::instance = nullptr;
+
+}
+
+#endif // __ASURA_SINGLETON_H__
\ No newline at end of file
-- 
cgit v1.1-26-g67d0