Turn function into infinite range

[Martin Nowak via Digitalmars-d-learn]

Does anyone know a construct to turn a lambda into an infinite range.

    import std.random;

    unittest
    {
        Random gen;
        foreach(v; xxx!(() => uniform(0, 100, gen)).take(10))
            writeln(v);
    }

I though I've seen this around somewhere but can no longer find it.