how to print using iterator in c++? - c++

Question

I am writing a program in VC++. Here I am declaring class Product and Client.In client I'm using a function list initProduct() in which list::iterator i; is used.I'm unable to display list using iterator.
This my code:
#include "StdAfx.h"
#include <iostream>
#include <string>
#include <list>
#include <iterator>
using namespace std;
class Product
{
int item_code;
string name;
float price;
int count;
public:
void get_detail()
{
cout<<"Enter the details(code,name,price,count)\n"<<endl;
cin>>item_code>>name>>price>>count;
}
};
class Client
{
public:
list<Product> initProduct()
{
char ans='y';
list<Product>l;
list<Product>::iterator i;
while(ans=='y')
{
Product *p = new Product();
p->get_detail();
l.push_back(*p);
cout<<"wanna continue(y/n)"<<endl;
cin>>ans;
}
cout<<"*******"<<endl;
for(i=l.begin(); i!=l.end(); i++)
cout << *i << ' '; //ERROR no operator << match these operand
return l;
}
};
int main()
{
Client c;
c.initProduct();
system("PAUSE");
}

Answer 1

You must implement the following function
class Product {
// ...
friend std::ostream& operator << (std::ostream& output, const Product& product)
{
// Just an example of what you can output
output << product.item_code << ' ' << product.name << ' ';
output << product.price << ' ' << product.count;
return output;
}
// ...
};
You declare the function a friend of the class because it must be able to access the private properties of a Product.

Answer 2

You need to produce an ostream& operator<<(ostream& os, const Product& product) that prints the information you want to display.

Answer 3

If you're using C++11 you can use auto :
for(auto it : Product)
{
cout << it.toString();
}
but you'll have to implement this toString() which will display all the infos you want