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#include <iostream>
using namespace std;
 
class Test
{
public:
    Test(string s)
    {
        str = s;
       cout<<"Test creat\n";
    }
    ~Test()
    {
        cout<<"Test delete:"<<str<<endl;
    }
    string& getStr()
    {
        return str;
    }
    void setStr(string s)
    {
        str = s;
    }
    void print()
    {
        cout<<str<<endl;
    }
private:
    string str;
};
 
 
int main()
{
    auto_ptr<Test> ptest(new Test("123"));
    ptest->setStr("hello ");
    ptest->print();
    ptest.get()->print();
    ptest->getStr() += "world !";
    (*ptest).print();
    ptest.reset(new Test("123"));
    ptest->print();
    return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:35:5: error: ‘auto_ptr’ was not declared in this scope
     auto_ptr<Test> ptest(new Test("123"));
     ^~~~~~~~
prog.cpp:35:18: error: expected primary-expression before ‘>’ token
     auto_ptr<Test> ptest(new Test("123"));
                  ^
prog.cpp:35:41: error: ‘ptest’ was not declared in this scope
     auto_ptr<Test> ptest(new Test("123"));
                                         ^

Standard output is empty