#include <iostream>

using namespace std;

class CVector

{

public:

    int x, y;

    CVector()

            : x(), y()

    {

    }

    CVector(int a, int b)

            : x(a), y(b)

    {

    }

    ;

    CVector operator +(const CVector&);

};

//+号是双目运算,这个成员函数的形式

CVector CVector::operator +(const CVector& param)

{

    CVector temp;

    temp.x = x + param.x;

    temp.y = y + param.y;

    return temp;

}

//+号的非成员函数形式

CVector operator+(const CVector& lhs, const CVector& rhs)

{

    cout<<"no member function"<<endl;

    CVector temp;

    temp.x = lhs.x + rhs.x;

    temp.y = lhs.y + rhs.y;

    return temp;

}

/**

 *运算符重载表,注意成员函数和非成员函数的区别

 * Expression    Operator                                         Member function        Non-member function

 * @a            + - * & ! ~ ++ --                                A::operator@()         operator@(A)

 * a@            ++ --                                            A::operator@(int)      operator@(A,int)

 * a@b           + - * / % ^ & | < > == != <= >= << >> && || ,    A::operator@(B)        operator@(A,B)

 * a@b           = += -= *= /= %= ^= &= |= <<= >>= []             A::operator@(B)          -

 * a(b,c...)     ()                                               A::operator()(B,C...)    -

 * a->b          ->                                               A::operator->()          -
 * (TYPE) a      TYPE                                             A::operator TYPE()       -

 */

int main()

{

    CVector foo(, );

    CVector bar(, );

    CVector result;

    CVector result2 = foo.operator +(bar);

    result = foo + bar;

    CVector result3 = foo+bar;

    cout << result.x << ',' << result.y << endl;

    cout << result2.x << ',' << result2.y << endl;

    cout << result3.x << ',' << result3.y << endl;

    return ;

}