Compare two vars of T in a generic method <T, U> (code port from C ++ to C #)

Question

How to compare two vars of type T in a method of the general class <T, U>? Here is a sample code that causes the following compiler error:

Error CS0019 The operator '> =' cannot be applied to operands of type 'T' and 'T'

class IntervalSet< T, U >
{
    public void Add ( T start, T end, ref U val )
    {
        // new interval is empty?
        if (start >= end) // ERROR
            return; 
    }
}

I am trying to transfer the source code from C ++ to C #, and C # is new to me. Thank you for your help.

Answer 1

You must specify C #, which is Tcomparable, otherwise you can only do System.Objectthings with T(and this is not so much), excluding creating a new instance, since C # does not even know it Thas a default constructor:

class IntervalSet< T, U >
    where T : IComparable<T>
{
    public void Add ( T start, T end, ref U val )
    {
        if (start.CompareTo(end) >= 0) {
        }
    }
}

, , int, string, DateTime .., .

: IComparable <T> ,
            ( #)