c++學習-運算子多載

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#include <iostream>using namespace std;class num{public:    num(){n=new int;*n=1;cout<<"construct:"<<endl;}    num(int x){n=new int;*n=x;cout<<"construct:"<<endl;}    ~num(){delete n;n=NULL; cout<<"destruct:"<<endl;}    //num(num &a){this->x=a.x;cout<<"copy:"<<x<<endl;}    int getX(){        return *n;    }        void setX(int x)    {        *n=x;    }    num operator=(num &r){        cout<<"operator+"<<endl;        *n=r.getX();        return *this; //返回two的副本，two的副本返回後進行析構，導致n指向的記憶體釋放    }private:    int *n;};int & test(int & x){    cout<<x<<endl;    return x;}int main(){        num one,two,three;    one.setX(110);    two=one; //<==> two.operator =(one);        cout<<two.getX()<<endl;        return 0;}

 

c++學習-運算子多載