34.share_ptr智能指针共享内存,引用计数

#include <iostream>
#include <memory>
#include <string>
#include <vector>
using namespace std;

void test()
{
        shared_ptr<int> P(new int[10]{ 1,2,3,4,5,6,7,8,9,0 });
        shared_ptr<int> P1 = P;
        cout << *P1 << endl;
        cout << *P << endl;
        //地址一样
        cout << &(*P1) << endl;
        cout << &(*P) << endl;

        //内存共享,赋值重载或者拷贝构造会使计数+1
        cout << P.use_count() << endl;
        //释放内存
        P.reset();
}

void main()
{
    test();
    cin.get();
}