Run-time loop issue

[RecursiveCoder]

Hi this is the function I'm looking at below. The method works perfectly if you only enter integers as userChoice is an int. Although whenever I enter any other type it spams the console. How can I validate it against these other types?

  void getUserChoice() {
	do {
		cout << "Enter choice: ";
		cin >> userChoice;
		if (userChoice <= 0 || userChoice > 5) 
			cout << "Please enter from 1-5!" << endl;
	} while (userChoice <= 0 || userChoice > 5);
}

[LB]

http://www.LB-Stuff.com/user-input

[RecursiveCoder]

That link doesnt work :S, blocked by my ISP or something.

[LB]

I accidentally posted the wrong link at first, try again.

[RecursiveCoder]

Ah thanks, I don't however understand this statement:


std::istringstream is {line};
if((is >> num) && !(is >> line)) //re-using `line` to test for extra stuff after the number
{
break; //done, we got what we wanted
}

If is = num? And if not = line

I didn't understand that. :S

[LB]

The >> operator returns the stream, and streams are implicitly convertible to a boolean which lets you know if the stream is still in a valid state after the last operation. The code reads as "if reading into num succeeds and reading into line fails".