Outputting and input with a class

[Too Explosive]

I have this very simple class. I want the input and output to work with the string however for both I get an error.

#include <iostream>
#include <string>
class bin
{
	public:
		int base10;
		std::string binary;
		friend std::ostream& operator<<(std::ostream& os, const bin& dt)
		{
			os << dt.binary;
			return os;
		}
		friend std::istream& operator >> (std::istream& is, const bin& x)
		{
			is >> x.binary;
			return is;
		}
};

For the output operator I get "no operator found which takes a right-hand operand of type 'const std::string'(or there is no acceptable conversion)" And for the input operator I get "no operator found which takes a left-hand operand of type 'std::istream'(or there is no acceptable conversion)"

Note: I removed a lot of the code that wasn't relevant to the problem however if needed I can post the other methods of the class.

[48T7M4Gy]

line 13 remove const and all your problems are gone. (Well until the next one comes along) :)

[liuyang]

Just think, how can you write to something 'const'?