Operator overloading in-depth C + +

For simple operators, you can refer to the previous blog post. You will then have a blog post that studies the dark copy from the perspective of overloading the equals operator.

Comma operator overloading

The comma operator overload requires a parameter and returns its own class. The comma operator is common in copy operations, and the following is the comma operator overload, which is an example of an assignment operation.

#include<string>#include<iostream>using namespace std;class Tem{    private:        int x;    public:        Tem(int);        Tem operator ,(Tem);        void display();}; Tem::Tem(int xx=0){    x = xx;}Tem Tem::operator , (Tem t){    cout<<t.x<<endl;    return Tem(t.x);}void Tem::display(){    cout<<"Class(Tem) includes of: "<<x<<endl;}int main(){        Tem tem1(10);    Tem tem2(20);    Tem other = (tem1,tem2); //会选择第二个 int a= 1,2;a等于2而不是1     other.display();        return 0;}

Take member operator overloading

Returns a pointer variable of the class type, in accordance with the usual usage, so that you can not use the pointer when declaring the variable, but can then be invoked as a pointer, simple and convenient.

#include<iostream>using namespace std;class Tem{    public:        int n;        float m;        Tem* operator ->(){            return this;        }}; int main(){    Tem tem;    tem->m = 10; //调用->运算符，返回Tem*类型并访问m     cout<<"tem.m is "<<tem.m<<endl;    cout<<"tem->m is "<<tem->m<<endl;    return 0;}

Input-output operator overloading

The >>,\<\< operator overloads are called after Cin, cout, respectively. We need to overload them with the meta operator, noting that the return types are IStream and Ostream, respectively.

  #include <iostream>using namespace Std;class date{private:int year,month,day;            public:date (int y,int m,int d) {year = y;            month = m;        Day = D; } Friend ostream& operator << (ostream &stream,const Date &date) {Stream<<date.ye            ar<< "" <<date.month<< "" <<date.day<<endl;        return stream; } Friend istream& operator >> (IStream &stream,date &date) {stream>>date.year>            >date.month>>date.day;        return stream; }};    int main () {Date _date (2017,6,13);    cout<<_date;    cin>>_date;    cout<<_date; return 0;}  

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Operator overloading in-depth C + +