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关系运算符-重载-判断相等

场景：两个对象，若有年龄和性别的不同，是否可以直接通过比较运算符来比较，而不用单独地取出每个对象的成员属性单独比较？

代码实现：

#include<iostream>
#include<string>using namespace std;
void test_0215_1();class Person {friend void test_0215_1();public:Person(int age , string name);~Person();bool operator==(Person& contrast);bool operator!=(Person& contrast);private :int person_age;string person_name;
};Person::Person(int age , string name) {cout << "有参构造函数调用" << "." << endl;person_age = age;person_name = name;cout << "age = " << age << "." << endl;cout << "name = " << name << "." << endl;
}Person::~Person() {cout << "析构函数调用" << "." << endl;
}bool Person::operator==(Person& contrast) {int this_variable = this->person_age;int person_variable = contrast.person_age;string this_name = this->person_name;string person_name = contrast.person_name;if (this->person_age == contrast.person_age && this->person_name == contrast.person_name) {return 1;}return 0;
}bool Person::operator!=(Person& contrast) {int this_age = person_age;string this_name = person_name;if (person_age != contrast.person_age && person_name != contrast.person_name) {return 1;}return 0;
}void test_0215_1() {Person per(15 , "Tom"), son(15 , "Tom");bool result = per == son;cout << "per == son ?==>" << (per == son ) << "." << endl;cout << "per != son ?==>" << (per != son) << "." << endl;
}int main() {cout << "hello ! world ! " << endl;test_0215_1();system("pause");return 0;
}

运行结果：

可以看到，两者赋值都为"Tom15"，经过重载后。信息一致。

函数调用运算符重载

使用场景：传入不同的参数，实现不同的功能；匿名类使用。

代码展示：

#include<iostream>
#include<string>using namespace std;
void test_0215_2();class Print {
public:Print();void operator()(string con);
private:string print_context;
};class Add {
public:int operator()(int num, int ber) {return num + ber;}
};void Print::operator()(string con) {//第一个括号是重载的符号cout << con << "." << endl;
}Print::Print() {//print_context = context;
}void test_0215_2() {//Print print();//这样写会被当成函数的声明，返回值是Print，应该下面这样写Print print;string query = "hello ? world ? ";print(query);cout << "正常使用add功能" << "." << endl;int add = Add()(15, 20);cout <<"add = Add(15,20) ==> " << add << endl;cout << "匿名函数对象调用" << "." << endl;cout <<"Add()(20,20) ==> " << Add()(20, 20) << "." << endl;
}int main() {cout << "hello ! world ! " << endl;test_0215_2();system("pause");return 0;}

运行结果

由图可以看出，打印输出有结果，同时有匿名函数对象的调用。

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如有不当之处欢迎指出！谢谢！