Expression * clone() const 
It creates a new copy of this expression. 
 
A base class for binary functions. 
 
BinaryOp & operator=(const BinaryOp &rhs)
 
A base class for binary operations. 
 
TE_DEFINE_VISITABLE BinaryOp(const std::string &name, Expression *arg1, Expression *arg2)
Constructor. 
 
BinaryFunction & operator=(const BinaryFunction &rhs)
 
A base class for binary operations. 
 
This is an abstract class that models a query expression.