implmentation of IEqualityComparer<> with Func<> inputs for overrides

Comparer.cs

public class Comparer<T> : IEqualityComparer<T>
{
	private readonly Func<T, int> _getHashCode;
	private readonly Func<T, T, bool> _equals;

	public Comparer(Func<T, T, bool> equals) : this(equals, null)
	{
	}

	public Comparer(Func<T, int> getHashCode) : this(null, getHashCode)
	{
	}

	public Comparer(Func<T, T, bool> equals, Func<T, int> getHashCode)
	{
		_equals = equals;
		_getHashCode = getHashCode;
	}

	public bool Equals(T x, T y)
	{
		return _equals != null ? _equals(x, y) : Equals(x, y);
	}

	public int GetHashCode(T obj)
	{
		return _getHashCode != null ? _getHashCode(obj) : obj.GetHashCode();
	}
}