How does operator overloading of true and false work?

Question

You can overload operator true and false i looked at examples and found this http://msdn.microsoft.com/en-us/library/aa691312%28v=vs.71%29.aspx

I completely dont und

Answer 1

When overloading the true and false operators they don't just return true and false, they are used to determine if a value of your type is considered to be true or false.

If for example a zero value in your class represents false, then a non-zero value represents true:

public static bool operator true(MyTimeSpan t) { return t.Value != 0; }
public static bool operator false(MyTimeSpan t) { return t.Value == 0; }

As the operators are each others inverse, the compiler doesn't need to use both to determine if a value is true or false. If you write if(obj) the compiler will use the true operator to determine if the value is true.