How can I delete a line from a text file in C++?

Question

I want to delete a line of my text file without replacing it with " ". Just as a side note: my file has newlines. So I have more than one line (like a table)

void Data::delete_line(const string& idNr) {
    ifstream list;
    string readFile, id;
    list.open("list.txt", ios::app);

    if (list.is_open()) {
        while (getline(list, readFile)) {
            int pos = readFile.find(';');
            id = readFile.substr(0, pos);
            if (idNr == id) {
                //deleting the line here
            }
        }
    }

}

I found this question but it does not solve my problem:

Answer 1

Maybe you can just create a new file and put your data into the new file. Like this:

void Data::delete_line(const string& idNr) {
ifstream list;
ofstream outFile("newList.txt");
string readFile, id;

list.open("list.txt", ios::app);

if (list.is_open()) {
    while (getline(list, readFile)) {
        int pos = readFile.find(';');
        id = readFile.substr(0, pos);
        if (idNr != id) {
            outFile << readFile;
        }
    }
}
list.close();
outFile.close();

remove("list.txt");
rename("newList.txt", "list.txt");
}

At the end you just remove your old file and rename the new file with the name of the old file. I hope this will solve your problem.