public override ValueEval Evaluate(int srcCellRow, int srcCellCol, ValueEval arg0)
{
double d;
try
{
ValueEval ve = OperandResolver.GetSingleValue(arg0, srcCellRow, srcCellCol);
if (ve is BlankEval)
{
return(NumberEval.ZERO);
}
if (ve is StringEval)
{
// Note - asymmetric with UnaryMinus
// -"hello" Evaluates to #VALUE!
// but +"hello" Evaluates to "hello"
return(ve);
}
d = OperandResolver.CoerceValueToDouble(ve);
}
catch (EvaluationException e)
{
return(e.GetErrorEval());
}
return(new NumberEval(+d));
}
public override ValueEval Evaluate(int srcRowIndex, int srcColumnIndex, ValueEval arg0)
{
double d;
try
{
ValueEval ve = OperandResolver.GetSingleValue(arg0, srcRowIndex, srcColumnIndex);
d = OperandResolver.CoerceValueToDouble(ve);
}
catch (EvaluationException e)
{
return(e.GetErrorEval());
}
if (d == 0.0)
{ // this '==' matches +0.0 and -0.0
return(NumberEval.ZERO);
}
return(new NumberEval(-d));
}
//public int Type
//{
// get
// {
// // TODO - remove
// throw new Exception("obsolete code should not be called");
// }
//}
protected double SingleOperandEvaluate(ValueEval arg, int srcCellRow, int srcCellCol)
{
ValueEval ve = OperandResolver.GetSingleValue(arg, srcCellRow, srcCellCol);
return(OperandResolver.CoerceValueToDouble(ve));
}