/// <summary>
/// If the specified value is of any numeric type, retrieves the value as a <c>decimal</c>,
/// casting if necessary.
/// <para>The result is empty if the specified value is not of a numeric type.</para>
/// </summary>
/// <param name="value"></param>
/// <returns></returns>
public static Opt <decimal> NumericValueAsDecimalOpt(this IConvertible value)
{
switch (Classify(value))
{
case SimpleTypeClassification.Decimal:
{
return(value.DecimalValueOpt());
}
case SimpleTypeClassification.FloatingPoint:
{
return(value
.FloatingPointValueOpt()
.SelectFix(doubleValue => (decimal)doubleValue));
}
case SimpleTypeClassification.SignedIntegral:
{
return(value
.SignedIntegralValueOpt()
.SelectFix(longValue => (decimal)longValue));
}
case SimpleTypeClassification.UnsignedIntegral:
{
return(value
.UnsignedIntegralValueOpt()
.SelectFix(ulongValue => (decimal)ulongValue));
}
default:
return(Opt.Empty <decimal>());
}
}