如何在C ++中修复“没有可行的重载'='”

Question

This functions purpose is to put the individual lines of a .txt file into an array no bigger than 20. However, I don't know how to progress without being able to assign each line in my loop to that array.

int read_file(string file_name, person map[20], int 
line_limit)
{
    int line_count = 0;
    string x;
    person specific;

Btw the person class has 2 strings called first_name and last_name and 1 int named age. StackOverflow won't allow me to post the entire program I guess.

    fstream input_file;



    input_file.open(file_name, ios::in); 
    if (input_file.is_open())
    {
        cout << "WORKING" << endl;
        //Loop through .txt file
        while (!input_file.eof() && line_count < 
line_limit)
        {
            if (input_file.good())
            {
                input_file >> x;
                map[line_count] = x;   

The ABOVE line derives "No viable overloaded '=' " error.

                line_count++;
            }

        }
     }
    else
        cout << "Not Working" << endl;
        return 1;

    return 0;
}

Any tips would also be great!

This is the .txt file I'm looping through. I want to assign each firs name, last name, and age as I loop through the .txt file. I want to assign it to string x and then put the what is in x at the time into the array that is type person that takes parameters string last_name, string first_name, and int age.

Ann Christensen  70
Carlos Morales   68
David Bowman     45
Frank Bowman     37
John Bowman      30
Kathleen Gueller 34
Mark Bowman      42
Mark Bowman      13
Richard Bowman   47
Susan Cox        36

class person
{



private:
    string first_name;
    string last_name;
    int age;

//Person Constructor - Empty
public:
    person()
    {
        first_name = "";
        last_name = "";
        age = 0;

        //void get(istream &);
        //void put(ostream &);
        //bool operator = ();
}

Answer 1

You're trying to assign a string into a position that should hold a person object. This attempts to do either 1, or, if that fails, goes on to 2.

1. Convert the string into a person , using a conversion that would be defined by the class person , which looks like operator string()

2. Assign the string to the person using a method operator=(string) . This must be defined in the person class.

Another option, since, what I think you're trying to do is to assign to a specific member, is to define a setter method. Usually, this would look like set_first_name(string) , if you are defining a setter for first_name , and would assign first_name to the accepted parameter. Basically, you just need some way to set first_name outside the class.

If you're assigning a string to another string, you won't get an operator= error. That only happens with user-defined classes.