ifstream into a vector

[homsta]

So in a nutshell I need to read from a file a set of data, and I want to put that data into a vector. We had a lab where something similar was done, but I just can't seem to wrap my head around how it works exactly.

I can't figure out how to do a loop that will read up to a certain amount of data from the file, put that into a vector, and repeat until it reaches the end of file.

If anybody can explain this concept to me I would greatly appreciate it.

Here's my code for my customer header

class customer {
public:
	void print_all(customer* x);
	customer(string fn, string ln, double bal, int acct,int pin)
		: first_name(fn),last_name(ln),balance(bal),account_number(acct), pin_number(pin) {}

	string get_fn()   {return first_name;}
	string get_ln()   {return last_name;}
	int    get_pin()  {return pin_number;}
	double get_bal()  {return balance;}
	int    get_acct() {return account_number;}

	void put_fn(string n) {first_name=n;}
	void put_ln(string n) {last_name=n;}
	void put_pin(int n) {pin_number=n;}
	void put_bal(double n) {balance=n;}
	void put_acct(int n) {account_number=n;}

	void disp_customer();

	void deposit(double n);
	void withdraw(double n);
	
	vector<customer> cust;

private:
	string first_name;
	string last_name;
	int pin_number;
	double balance;
	int account_number;

};	

void customer::disp_customer()
{
	cout<<"Account #:"<<get_acct()<<endl;
	cout<<"Name:"<<get_fn()<<" "<<get_ln()<<endl;
	cout<<"Current Balance:"<<get_bal()<<endl;
}

istream& operator>>(istream& is,customer& c)
{
	char ch;
	string fn,ln;
	int acct,pin;
	double bal;

    is>>ch>>acct>>ch>>ch>>fn>>ch>>ch>>ln>>ch>>ch>>bal>>ch>>ch>>pin>>ch;

	c.put_fn(fn);
	c.put_ln(ln);
	c.put_pin(pin);
	c.put_acct(acct);
	c.put_bal(bal);

	return is;
}

ostream& operator<<(ostream& os, customer& c)
{
	return os<<"{"<<c.get_acct()<<"} {"<<c.get_fn()<<"} {"<<c.get_ln()<<"} {"<<c.get_bal()<<"} {"<<c.get_pin()<<"} ";
}


void customer::withdraw(double n)
{
	double a=0;

	cout<<"Current balance\n\n$"<<n<<"\n\n";
	
	cout<<"Withdrawal ammount:";
	cin>>a;
	
	n=n-a;

	cout<<"\nCurrent balance after withdrawal:$"<<n<<"\n\n";
}

[PanGalactic]

see std::copy and std::istream_iterator, and std::back_inserter

vector<customer> data;
copy(istream_iterator<customer>(cin), istream_iterator<customer>(), back_inserter(data));