| 
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The node will thus have two children. It owns both of them.
|  NodeBin (BinOper* op, Node* left, Node* right, unsigned line)
 | NodeBin | 
Caller must not delete / modify pointers.
Parameters:
| op | binary operation of node. | 
| left | first argument of operation. | 
| right | second argument of operation. | 
| line | line where node was created. | 
|  ~NodeBin ()
 | ~NodeBin | 
|  DEFINE_VISITABLE ()
 | DEFINE_VISITABLE | 
| const BinOper&  op ()
 | op | 
[const]
Returns: operation associated with node.
| Node&  left ()
 | left | 
[const]
Returns: first argument of operation.
| Node&  right ()
 | right | 
[const]
Returns: second argument of operation.