将向量写入文件c ++

如何解决将向量写入文件c ++

在这里，我有一个称为联系人的结构

 typedef struct contacts 
    {
       string name;   //{jhonathan,anderson,felicia}
       string nickName; //{jhonny,andy,felic}
       string phoneNumber; // {13453514,148039,328490}
       string carrier;  // {atandt,coolmobiles,atandt }
       string address; // {1bcd,gfhs,jhtd }
    
    } contactDetails;
    
    vector <contactDetails> proContactFile;

我试图将向量中的数据写入输出文件。为此，我编写了以下代码

    ofstream output_file("temp.csv");
    ostream_iterator<contactDetails> output_iterator(output_file,"\n");
    copy(begin(proContactFile),end(proContactFile),output_iterator);

但是这段代码总是给我一个错误。我也想通过以下方式将数据写入文件。

Name,Nick name,Phone number,Carrier,Address

我的代码有什么问题？

解决方法

std::ostream_iterator<T>为类型operator<<调用T。您需要为std::ostream& operator<<(std::ostream& os,const contactDetails& cont)编写代码，以便ostream_iterator进行迭代并写入其输出流。

typedef struct contacts 
{
   string name;   //{jhonathan,anderson,felicia}
   string nickName; //{jhonny,andy,felic}
   string phoneNumber; // {13453514,148039,328490}
   string carrier;  // {atandt,coolmobiles,atandt }
   string address; // {1bcd,gfhs,jhtd }
} contactDetails;
    
vector <contactDetails> proContactFile;

std::ostream& operator<<(std::ostream& os,const contactDetails& cont)
{
    os << cont.name << "," << cont.nickName << ",";
    os << cont.phoneNumber << "," << cont.carrier << ",";
    os << cont.address << endl;
    return os;
}

,

void deleteContact() //Delete Feature
{
    ofstream output_file("temp.csv");
    int selectContact;
    cout << "Which Contact you want to delete ? Enter the relevent index " << endl;
    cin >> selectContact;
    
    if (selectContact > proContactFile.size()) {
        cout << "Invalid entry";
    }
    else {
        proContactFile.erase(proContactFile.begin() + (selectContact - 1));
        cout << "Delete successfully";
    }
   
    std::ostream& operator<<(std::ostream & os,const contactDetails & cont)
    {
        os << cont.name << ",";
        os << cont.phoneNumber << ",";
        os << cont.address << endl;
        return os;
    }
    output_file.close();
}

嘿，以前的错误消失了，现在只说了expected a ';'。但是这里什么都没丢失。