C++智能指针入门

上次，金山面试被问到智能指针，全然不知，静下心来好好学习学习。

C++ 提供四种智能指针auto_ptr, shared_ptr, unique_ptr, week_ptr.

用法：

#include <string>#include <memory>using namespace std;class report{private:    string str;public:    report(const string s):str(s) //构造方法    {        cout<<"1 report Object  has been build!"<<endl;    }    ~report()    {        cout<<"3 report Object  deleted!"<<endl;    }    void talk()    {        cout<<str<<endl;    }};int main(){    string talk="2 hello,this is a test!";    {        auto_ptr<report> ptr(new report(talk));        ptr->talk();    }    {        shared_ptr<report> ptr(new report(talk));        ptr->talk();    }    {        unique_ptr<report> ptr(new report(talk));        ptr->talk();    }    return 0;}