public TwoOp(Func <float, float, float> op, EvalExpr left, EvalExpr right, String str = "op")
{
_op = op;
_left = left;
_right = right;
_str = str;
}
public OneOp(Func <float, float> op, EvalExpr eval, String str = "op")
{
_op = op;
_eval = eval;
_str = str;
}