操作符重载前置和后置的区别与实现

我会带着你远行 2022-06-16 11:28 244阅读 0赞

为了区别前置++和后置++,c++编译器默认前置++,对后置++添加了占位符来加以区分。

例如 用成员函数实现操作符重载,分别实现前置++和后置++。

class Complex
{

private:

int a;

int b;

public:

Complex(int a = 0, int b = 0)

{

this->a = a;

this->b = b;

}

void print()

{

cout << “a:” << a << endl;

cout << “b:” << b << endl;

}

// 操作符重载首先是通过函数实现的。operator+是函数名。

Complex& operator+(Complex& c2)

{

a = a + c2.a;

b = b + c2.b;

return *this;

}

Complex& operator++()

{

this->a++;

this->b++;

return *this;

}

Complex operator++(int) // 添加占位符

{

Complex tmp;

tmp = *this;

this->a++;

this->b++;

return tmp;

}

};

void main()
{

Complex c1(1, 2), c2(3, 4);

Complex c3 = c1 + c2;//相当于 Complex c3 = c1.operator+(c2);

c3.print();

Complex c4(5, 6);

++c4;//相当于 c4.operator++();

c4.print();

Complex c5(7, 8);

c5++;//相当于 c5.operator++(0);

c5.print();

}

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