級聯重載+運算

Question

這裏的當前代碼：

const complex complex::operator+(const complex &right) 
{ 
    complex result; 
    result.realPart = realPart + right.realPart; 
    result.imPart = imPart + right.imPart; 
    return result; 
} 

如何修改以便

A = B + C + d;

是否允許？

Answer 1

使它成爲一個const成員函數：

const complex complex::operator+(const complex &right) const ...