#ifndef MYCLASS_H
#define MYCLASS_H
#include <iostream>
using namespace std;
class MyClass
{
friend bool operator==(int b, MyClass my); //友元函數重載運算符
friend void sayHello(MyClass my); //友元函數
public:
bool operator==(int b){return (b == a);} //成員函數重載運算符
private:
int a;
public:
enum Hello{hello = 0, world};
public:
MyClass();
};
void sayHello(); //非成員函數
#endif // MYCLASS_H
cpp文件
#include <iostream>
#include "myclass.h"
using namespace std;
bool operator==(int b, MyClass my)
{
return (b == my.a);
}
void sayHello(MyClass my)
{
cout << "a:" << my.a << endl;
}
void sayHello()
{
cout << "Hello World" << endl;
}
MyClass::MyClass():a(2)
{
}
main.cpp
#include <iostream>
#include "myclass.h"
using namespace std;
int main()
{
cout << "Hello World!" << endl;
MyClass my, you;
bool c = (3 == you);
cout << "c:" << c << endl;
cout << "my==2:" << (my==2) << endl;
sayHello(my);
sayHello();
return 0;
}