42   return new And(*
this);
 
TE_DEFINE_VISITABLE And(Expression *arg1, Expression *arg2)
Constructor. 
 
BinaryOp & operator=(const BinaryOp &rhs)
 
Boolean logic operator: AND. 
 
This is an abstract class that models a query expression. 
 
Expression * clone() const 
It creates a new copy of this expression. 
 
And & operator=(const And &rhs)
 
A base class for binary operations. 
 
Boolean logic operator: AND - syntatic-suggar.