public override MaybeNotNull <R> SelectMany <K, R>(Func <T, MaybeNotNull <K> > maybeSelector, Func <T, K, R> resultSelector)
{
try
{
var k = maybeSelector(this.Value);
if (k.Kind == MaybeKind.Value)
{
var res = resultSelector(this.Value, k.Value);
return(isNull(res) ? MaybeNotNull <R> .MakeNull() : MaybeNotNull <R> .MakeValue(res));
}
else
{
return(k.SelectMany <R, R>(null, null));
}
}
catch (Exception ex)
{
return(MaybeNotNull <R> .MakeError(ex));
}
}
public static MaybeNotNull <T> Throw <T>(Exception ex)
{
return(MaybeNotNull <T> .MakeError(ex));
}