打印出对象矢量 [英] Print Out Vector of Objects

问题描述

我正在尝试打印出对象的矢量但是当我使用cout<<它给出了如下所示的错误。请提供有关如何迭代和打印存储在对象中的信息的建议。

I am trying to print out the vector of objects but when I used the cout<< it gives error as shown below. Please provide advise on how to iterate and print out the information stored in the objects.

#include <iostream>
#include <vector>
#include <list>
#include<fstream>
using namespace std;

class Date
{

public:
   int day;
   int month;
   int year;

   Date(int day, int month, int year): day(day), month(month), year(year) {};
};

int main ()

{
    vector <Date> date;

        date.push_back(Date(2, 3, 1980));
        date.push_back(Date(5, 4, 1982));
        date.push_back(Date(1, 6, 1989));

        for(auto it = date.begin(); it != date.end(); it++)
        {
            cout<<*it<<endl; //Get error message

        }



    return 0;

}

推荐答案

嗯，当然。这是因为您没有为 Data 定义运算符''<<''。您可以按组件输出数据，也可以根据每个组件的输出定义运算符。



这篇Microsoft文章对此进行了解释： http://msdn.microsoft.com/en-us/library/1z2f6c2k%28v=vs。 110％29.aspx [ ^ ]。

-SA

Well, of course. This is because you did not define the operator ''<<'' for Data. You can output the data per-component or define the operator based on such per-component output.

This is explained in this Microsoft article: http://msdn.microsoft.com/en-us/library/1z2f6c2k%28v=vs.110%29.aspx[^].

—SA

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