Func<T> is just the type signature they use for lambdas. The syntax allows fully inline functions now:
() => { DoSomething(); }
No return value needed (compiles down to an Action<T> I think)
() => { DoSomething(); }
No return value needed (compiles down to an Action<T> I think)
Which is an other crufty thing in C#: because Void/() is not a type (inherited from Java), it needs to have both `Func<Tn..., T>` and `Action<Tn...>` in order to handle functions-with-a-return-value and functions-without-a-return-value.
I fail to see the relation this has with my issue.
Func<int,int> fib = null;
fib = n => n > 1 ? fib(n - 1) + fib(n - 2) : n;
delegate Func<A,R> Recursive<A,R>(Recursive<A,R> r);
static Func<A, R> Y<A, R>(Func<Func<A, R>, Func<A, R>> f) {
Recursive<A, R> rec = r => a => f(r(r))(a);
return rec(rec);
}
Func<int,int> fib = Y<int,int>(f => n => n > 1 ? f(n - 1) + f(n - 2) : n);