/// <summary>
/// Constructor for a formula cell
/// </summary>
/// <param name="formula">Formula in Cell</param>
/// <param name="lookup">Lookup delegate</param>
public Cell(Formula formula, Func<string, double> lookup)
{
contents = formula;
value = formula.Evaluate(lookup);
contents_type = formula.GetType().ToString();
value_type = value.GetType().ToString();
}
