//==============[ operator<(Oid &x,Oid &y) ]=============================
// less than < overloaded
int operator<(const Oid &lhs, const Oid &rhs)
{
int result;
// call nCompare with the current
// Oidx, Oidy and len of Oidx
if((result = lhs.nCompare(rhs.len(), rhs))<0) return 1;
if (result > 0) return 0;
// if here, equivalent substrings, call the shorter one <
return (lhs.len() < rhs.len());
}
//=============[ int operator == oid,oid ]=================================
// equivlence operator overloaded
int operator==(const Oid &lhs, const Oid &rhs)
{
// ensure same len, then use nCompare
if (rhs.len() != lhs.len()) return 0;
return (lhs.nCompare(rhs.len(), rhs) == 0);
}