Using User Set Variables to Create an Instance of a Class

Question

I was wondering if anyone had any advice on how to take a user input from a std::cin and enter it into a variable. The variable would be used to add an object to a class. Thanks!

This is the code I tried but it did not seem to work:

#include <iostream>
#include <string>
#include "POI.h"

std::string create_file;

int main() {
    std::cout << "Name the File You Would Like to Create: ";
    std::cin >> create_file;
    POI create_file;
    create_file.poi_add(create_file, 1, 12, 7, "unknown");
    std::cout << create_file.poi_name();
}

Answer 1

Yes, you can use operator overloading. In particular, you can overload operator>> as shown below. With this you can directly use std::cin with a POI type object.

class POI 
{
   private:
       std::string name ;
  //overload operator so that std::cin can be used with this class 
  friend std::istream& operator>>(std::istream& is, POI&);
};
std::istream& operator>>(std::istream& is, POI& obj)
{
    is >> obj.name ;
    
    //check if input succeded 
    if(is )
    {
        //do somethind 
    }
    else 
    {
        obj = POI(); //leave the object in default state;
    }
    return is;
}
int main()
{
    POI p; 
    std::cin >> p;//this will use the overloaded operator>>
    return 0;
}

Note that the if and else is provide to validate if the input succeeded. If the input fails, then the object is left in a default state.

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Additionally note that your inner variable create_file shadows the outer variable with the same name.