//运算符重载的相关知识点
//重载：一名多用 自定义规则
//不可重载的运算符： . :: .* ?: sizeof
//重载后的优先级不变 不改变结合性和所需操作数 不去创建新的运算符
//<< >>只能用全局函数重载
//= ， 【】 ， （） ， -> ，只能用成员函数重载
//c++通过一个站位参数 区分前置后置
/*
//我们试着重载一下运算符 + 号
#include <iostream>
#include <windows.h>
using namespace std;
class Complex
{
friend Complex operator +(Complex &c1, Complex &c2);
private:
int m_a;
int m_b;
public:
Complex();
Complex(int a, int b);
void print();
};
Complex::Complex()
{
m_a = 0;
m_b = 0;
}
Complex::Complex(int a, int b)
{
m_a = a;
m_b = b;
}
Complex operator +(Complex &c1, Complex &c2)
{
Complex tmp;
tmp.m_a = c1.m_a + c2.m_a;
tmp.m_b = c1.m_b + c2.m_b;
return tmp;
}
void Complex::print()
{
cout << "m_a = " << m_a << " m_b = " << m_b << endl;
}
int main()
{
Complex c1(1, 2);
Complex c2(3, 4);
Complex c3;
c3 = c1 + c2;
c3.print();
system("pause");
return 0;
}
*/
/*
//重载<<
#include <iostream>
#include <windows.h>
using namespace std;
class Complex
{
friend ostream & operator <<(ostream &out, Complex &c);
private:
int m_a;
int m_b;
public:
Complex();
Complex(int a, int b);
void print();
};
Complex::Complex()
{
m_a = 0;
m_b = 0;
}
Complex::Complex(int a, int b)
{
m_a = a;
m_b = b;
}
void Complex::print()
{
cout << "m_a = " << m_a << " m_b = " << m_b << endl;
}
ostream & operator << (ostream &out, Complex & c)//重载<<
{
out << "c.m_a = " << c.m_a << " c.m_b = " << c.m_b << endl;
return out;
}
int main()
{
Complex c2(3, 4);
cout << c2 << endl;
system("pause");
return 0;
}
*/
/**/
//我们试着重载一下运算符 ++ 前置和后置
#include <iostream>
#include <windows.h>
using namespace std;
class Complex
{
friend ostream & operator <<(ostream &out, Complex &c);
private:
int m_a;
int m_b;
public:
Complex();
Complex(int a, int b);
void print();
Complex operator + (Complex& c2);
Complex operator ++(int);//后置++
Complex &operator ++();//前置++
};
Complex::Complex()
{
m_a = 0;
m_b = 0;
}
Complex::Complex(int a, int b)
{
m_a = a;
m_b = b;
}
void Complex::print()
{
cout << "m_a = " << m_a << " m_b = " << m_b << endl;
}
ostream & operator << (ostream &out, Complex & c)//重载 <<
{
out << "c.m_a =" << c.m_a << " c.m_b =" << c.m_b << endl;
return out;
}
Complex Complex::operator ++(int)//后置++
{
Complex c7;
c7.m_a = m_a;
c7.m_b = m_b;
m_a++;
m_b++;
return c7;
}
Complex& Complex::operator ++()//前置++
{
m_a++;
m_b++;
return *this;
}
int main()
{
Complex c1(1, 2);
cout << ++c1 << endl;
cout << c1++ << endl;
system("pause");
return 0;
}
/**/