singleton的实现代码

最新推荐文章于 2021-01-08 16:35:50 发布

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最新推荐文章于 2021-01-08 16:35:50 发布

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分类专栏： C/C++技术

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本文展示了一个使用C++和Boost库实现的单例模式示例。通过模板类定义单例，并利用boost::shared_ptr进行内存管理。示例中创建了一个名为Object的对象，演示了如何通过单例模式获取该对象的实例并调用其方法。

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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;
}