force generic parameter two implement one of two interfaces c#

Question

Is there anyway to force a constraints for a generic definition to implement one interface of two when I can not touch both interface

I want to do it for the IComparable interface:

class A<T> where T :IComparable IComparable<T>

I do not want the T must implements both interface but on of them

Is there any way to do it when I can not change the IComparable?

Answer 1

You could use one interface and wrap the other.

class A<T> where T : IComparable
{
}

class ComparableWrapper<T> : IComparable
      where T : IComparable<T>
{
    T _obj;
    public ComparableWrapper(T obj)
    {
        _obj = obj;
    }

    public T WrappedObject {get { return _obj;}}

    // wrapping code
}

This way, you can use both IComparable and IComparable