singleton的实现代码
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#include <iostream>#include <fstream>#include <boost/shared_ptr.hpp>using namespace std;template<typename T>class Singleton{public: static T* Instance() { if(ObjectPtr.get()==NULL) ObjectPtr.reset(new T()); return ObjectPtr.get(); }protected: Singleton() { } ~Singleton() { }private: static boost::shared_ptr<T> ObjectPtr;};class Object:public Singleton<Object>{ int Count = 0;private: Object() { Count = 0; cout<<"Object Created"<<endl; } ~Object() { cout<<"Object Destroyed"<<endl; }public: void SetValue(int value) { Count = value; } int GetValue() { return Count; } friend class Singleton<Object>; friend void boost::checked_delete<Object>(Object* x);};template<>boost::shared_ptr<Object> Singleton<Object>::ObjectPtr = boost::shared_ptr<Object>();boost::shared_ptr<int> ObjPtr();int main(){ Object* pObject1 = Object::Instance(); Object* pObject2 = Object::Instance(); cout<<pObject1->GetValue()<<" "<<pObject2->GetValue()<<endl; pObject1->SetValue(5); cout<<pObject1->GetValue()<<" "<<pObject2->GetValue()<<endl; pObject2->SetValue(4); cout<<pObject1->GetValue()<<" "<<pObject2->GetValue()<<endl; return 0;}
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