//運算符重載的相關知識點

//重載：一名多用 ?自定義規則

//不可重載的運算符： ? ?. ? ? :: ? ? .* ? ? ? ?: ? ? ?sizeof

//重載后的優先級不變 不改變結合性和所需操作數 ?不去創建新的運算符

?

//<< >>只能用全局函數重載

?

//= ， 【】 ， （） ， -> ，只能用成員函數重載

?

//c++通過一個站位參數 ? ?區分前置后置

?

/*

//我們試著重載一下運算符 + 號

#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;

}

*/

?

?

/*

//重載<<

?

#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)//重載<<

{

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;

}

?

?

*/

?

/**/

//我們試著重載一下運算符 ++ 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)//重載 <<

{

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;

}

/**/

總結

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