操作数返回不同的对象 [英] Operand returns different object

问题描述

因此，我正在编写一个具有两类多项式和多项式的程序.基本上，多项式只是单项式的数组.我需要创建一个operator +来添加两个单项式并返回多项式.到目前为止，我已经将多项式声明为monomial中的朋友类，并将其声明为Polynomial类中的朋友Polynomial operator+(const Monomial& a, const Monomial& b);，但是它似乎不起作用.

So I am making a program that has two classes monomial and polynomial. Basically a Polynomial is just an array of monomials. I need to create an operator + to add two monomials and return a polynomial. So far I have declared Polynomial as a friend class in monomial and friend Polynomial operator+(const Monomial& a, const Monomial& b); in class Polynomial but it doesnt seem to work.

friend Polynomial operator+(const Polynomial& a, const Monomial& b);

和

friend Polynomial operator+(const Monomial& a, const Polynomial& b);

两者都能正常工作，所以我感到非常困惑.

both work fine so im very confused were the issue lies.

推荐答案

这是一个可以干净编译的快速示例程序，当然，可以根据自己的喜好更改Monomial和Polynomial的内容.

Here is a quick example program that compiles cleanly, of course the contents of Monomial and Polynomial can be changed to your liking.

#include <vector>
class Monomial
{
public:
    Monomial() : A(0), x(0) {}
    int A;
    int x;
};
class Polynomial
{
public:
    Polynomial() {}
    Polynomial(const Monomial& a, const Monomial& b) {
        monomials.push_back(a);
        monomials.push_back(b);
    }
    std::vector<Monomial> monomials;
};
Polynomial operator+(const Monomial& a, const Monomial& b)
{
    return Polynomial(a, b);
}
int main(int argc, char *argv[])
{
    Monomial a;
    Monomial b;
    Polynomial poly = a + b;
    return 0;
}

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