Effective C++ .13使用智能指针来引用资源

#include <iostream>

#include <cstdlib>

#include <memory>

using namespace std;



class Kiwi {

private:

    int weight;

public:

    Kiwi(int w) : weight(w) {}

    ~Kiwi() {

        cout<<"~Kiwi"<<endl;

    }

    int getWeight() {return weight;}

};



void driven() {

    shared_ptr<Kiwi> p(new Kiwi(100));

    cout<<p->getWeight()<<endl;



    shared_ptr<Kiwi> q = p;

    cout<<p->getWeight()<<endl;

    cout<<q->getWeight()<<endl;



}



int main() {

    cout<<"test start"<<endl;

    driven();

    cout<<"test end"<<endl;

    return 0;

}

auto_ptr同时只能有一个指向资源

shared_ptr同时可以有多个指向资源