operator? 是什么

operator 是C++的一個(gè)關(guān)鍵字，它和運(yùn)算符（+,-,*,/,=,等等）一起使用，表示一個(gè)運(yùn)算符重載函數(shù)

operator 沒有返回語句

operator 的作用 :

1?把對(duì)象當(dāng)函數(shù)使用

具體的如下:

#include <iostream>
#include <string>
using namespace std;
class People
{
public:// 把對(duì)象當(dāng)函數(shù)使用int operator()(int a, int b) const{return a + b;}
};int main()
{People p;cout << p(13, 15) << endl;return 0;
}

2 對(duì)象進(jìn)行計(jì)算

operator的操作符有很多,如下

具體代碼如下:

#include <iostream>
#include <string>
using namespace std;class People
{public:int mage;public:People(int age){mage = age;}People operator+(People p){return People(mage + p.mage);}void showMessage(){cout << mage << endl;}
};int main()
{People people1(18);People people2(20);People people3(0);people3 = people1 + people2;people3.showMessage();return 0;
}

?3 類型轉(zhuǎn)換

#include <iostream>
#include <string>
using namespace std;class People
{public:int height;public:People(double mheight =0){height  = mheight;};operator double(){return height;}};int main()
{People people1(175.5);People people2(180.3);People people3(0);people3 = people1 + people2;cout<<people3<<endl;return 0;
}

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