// IComparable<IPair>
public int CompareTo(IPair <T> b)
{
return(b.IsNull() ?
1 : this.Equals(b) ?
0 : _p0.CompareTo(b.p0));
}
// IComparable<IPair>
public int CompareTo(IPair <T> b)
{
return(b.IsNull() ?
1 : this.Equals(b) ?
0 : _p0.CompareTo(b.p0));
}