[英]Ostream overloading operator on a linked list
I have a polynomial implementation in a linked list and want to do std::ostream
overloading operation but it gives my an error that no match for 'operator<<' in 'std::cout << p5'
我在链表中有一个多项式实现,想执行
std::ostream
重载操作,但是它给我一个错误,即no match for 'operator<<' in 'std::cout << p5'
That's my implementation but when I test it through cout << p5
I get the aforementioned error. 那是我的实现,但是当我通过
cout << p5
对其进行测试时,出现了上述错误。
UPDATE: header file: 更新:头文件:
struct term{
double coef;
unsigned deg;
struct term * next;
};
class Polynomial {
public:
constructors etc
overloading functions
friend ostream& operator << (ostream& out,const term& object);
}
then in other file poly.cpp i have: 然后在其他文件poly.cpp我有:
ostream & operator << (ostream& out, const Polynomial object){
term* q = object.getptr();
if (object.getptr() == NULL)
out << "( )";
else
while(q != NULL)
{
out << q->coef << "x^" << q->deg << " ";
q = q->next;
}
return out;
}
in main.cpp Polynomial p5, then added some terms and cout << p5
but I get errors. 在main.cpp多项式p5中,然后添加了一些术语和
cout << p5
但出现错误。
I think it's your declarations which are causing the problem: 我认为是您的声明引起了问题:
friend ostream & operator << (ostream & out, const term & object);
and 和
ostream & operator << (ostream & out, const Polynomial & object);
These don't match. 这些不匹配。 One is using a
term
object and the latter is using a Polynomial
object. 一种是使用
term
对象,而另一种是使用Polynomial
对象。 I'm assuming you want this function to use a term object because the function uses data memebers specific to the struct term
. 我假设您希望此函数使用term对象,因为该函数使用特定于struct
term
。 So change the latter to accept a term
object: 因此,更改后者以接受
term
对象:
ostream & operator << (ostream & out, const term & object);
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