public static IDelayed <ISeq <T> > Concat <T>(
this IDelayed <ISeq <T> > delayedSeq0,
IDelayed <ISeq <T> > delayedSeq1)
{
return(delayedSeq0.FlatMap(seq0 =>
seq0.Case(
() => delayedSeq1,
pair =>
Cons(pair.Item0, Delayed.Return(() => pair.Item1.Concat(delayedSeq1).Force())))));
}
public static IDelayed <ISeq <T1> > Select <T0, T1>(
this IDelayed <ISeq <T0> > delayedSeq,
Func <T0, T1> selector)
{
return(delayedSeq.FlatMap(seq =>
seq.Case(
() =>
Seq.Empty <T1>(),
pair =>
Seq.Cons(selector(pair.Item0), Delayed.Return(() => pair.Item1.Select(selector)).Force()))));
}
public static IDelayed <ISeq <T> > Where <T>(
this IDelayed <ISeq <T> > delayedSeq,
Func <T, bool> predicate)
{
return(delayedSeq.FlatMap(seq =>
seq.Case(
() => Seq.Empty <T>(),
pair => predicate(pair.Item0)
? Seq.Cons(pair.Item0, Delayed.Return(() => pair.Item1.Where(predicate).Force()))
: Delayed.Return(() => pair.Item1.Where(predicate).Force()))));
}