运算符重载
#include <iostream>
using namespace std;
class MyInt
{
private:
/**********************加法重载*************************/
friend MyInt operator+(const MyInt &a, const MyInt &b);
friend ostream &operator<<(ostream &out, const MyInt &a);
int val_;
public:
explicit MyInt(int val) : val_(val) {}
/*********************自增重载**************************/
// 自增前缀
MyInt &operator++()
{
val_++;
return *this;
}
// 自增后缀
MyInt operator++(int)
{
MyInt temp = *this;
val_++;
return temp;
}
/**************赋值运算符,拷贝构造************************/
MyInt &operator=(int i)
{
cout << "assignments operator" << endl;
val_ = i;
return *this;
}
MyInt(const MyInt &o) : val_(o.val_)
{
cout << "copy constructor" << endl;
}
/********定义转换操作符int q = a;************/
operator int()
{
return val_;
}
};
MyInt operator+(const MyInt &a, const MyInt &b)
{
return MyInt(a.val_ + b.val_);
}
ostream &operator<<(ostream &out, const MyInt &a)
{
out << a.val_;
return out;
}
int main()
{
MyInt a(3), b(5);
cout << a + b << endl;
int q = a;
cout << "q:" << q << endl;
MyInt c(3);
cout << c << "," << c++ << "," << c << endl;
int i = 3;
cout << i << "," << i++ << "," << i << endl;
b = a;
cout << "b:" << b << endl;
b = 7;
cout << "b:" << b << endl;
MyInt d = a;
cout << "d:" << d << endl;
return 0;
}
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