public static Rational GetRational([NotNull] this Directory directory, int tagType)
{
if (directory.TryGetRational(tagType, out Rational value))
{
return(value);
}
return(ThrowValueNotPossible <Rational>(directory, tagType));
}
private static T?ParseRational <T>(Directory directory, int tag, Func <double, T> convert) where T : struct
{
if (directory.TryGetRational(tag, out var rational))
{
var orig = (rational.Numerator / (double)rational.Denominator);
// var boxed = (object) orig;
return(convert(orig));
}
return(null);
}