protected virtual void ValidatePosition(RomanCalculator connector)
{
var afterNumbers = connector.After(this);
if (!afterNumbers.IsNullOrEmpty() && !(afterNumbers.All(o => o.Value <= this.Value)))
{
throw new Exception($"{this.Symbol} can nerver be subtracted.");
}
}
protected override void ValidatePosition(RomanCalculator connector)
{
var afterNumbers = connector.After(this);
if (!afterNumbers.IsNullOrEmpty() && !(afterNumbers.All(o => o.Value <= this.Value || new[] { SymbolEnum.D, SymbolEnum.M }.Contains(o.Symbol))))
{
throw new Exception($"{this.Symbol} can be only subtracted from {SymbolEnum.D} {SymbolEnum.M}.");
}
}