故事 这事是这样的，去年我在上课的时候，和老师讨论了一下关于架构的问题，我是开发Cocoa/iOS的，老师是开发Web的，而老师是一个坚定的singletons are evil的拥护者，我和他说了我的App的架构，直接被他一顿猛劈，强烈的谴责了我使用Singletons，我回应说，这个pattern在Cocoa里是大量使用的，结果被搞了一句“用的多的就是对的么？你回去多学习一下再来讨论吧”

Temporary shared memory management is always a bit of a difficult problem to solve. There are various well known ways of dealing with this problem but recently i’ve come across a novel solution to thi

鸡生蛋、蛋生鸡问题不必纠结，只需要仔细操控PTrackerArray，看代码 namespace  Private{ class LifetimeTracker{ public: LifetimeTracker(unsigned int x):longervity__(x){} vitual ~LifetimeTracker()=0; friend inline  bool Compa

构造函数是private，客户端无法产生Singletons，但Instance（）使得其编译期就得以实施 class Singleton{ public : static Singleton * Instance(){ if(!pInstance_) pInstance_=new Singleton; return pInstance_; } }