public ExprNode(NodeOp op)
{
throw new NotImplementedException();
//_op = op;
//_left = _right = mull;
//_val = 0;
//_txt = mull;
//_x = _y = 0;
}
public ExprValue(NodeOp op)
{
throw new NotImplementedException();
//_op = op;
//_txt = 0;
//_val = 0;
//_track = 0;
//_signal = 0;
//_train = 0;
}
public ExprNode(NodeOp op)
{
_op = op;
}
