对于某些类，我们需要保证系统中只能有一个实例，这种类的设计用到singleton模式模式。
单线程的singleton模式是 straightforward的，下面给出Java和C++11的线程安全singleton实现
Java：
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public class Singleton { private
static Singleton instance = null; private
static Object mutex = new
Object(); private
Singleton() { } public
static Singleton getInstance() { if(instance == null) { synchronized(mutex) { if(instance == null) instance = new
Singleton(); } } return
instance; }} |
C++:
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static
Singleton& get(){ static
Singleton instance; return
instance;} |
C++11 remove the need for manual locking. Concurrent execution shall wait if a static local variable is already being initialized.
Singleton 模式 Java,c++实现,布布扣,bubuko.com
原文：http://www.cnblogs.com/zhouzhuo/p/3747169.html