repeat.swift

// Creates a sequence that consists of a single element repeated n times,
// or an infinite sequence repeating that element indefinitely.
// [D std.range.repeat]: http://dlang.org/phobos/std_range.html#repeat
public func repeat<T>(x: T) -> SequenceOf<T> {
  return SequenceOf {_ -> GeneratorOf<T> in GeneratorOf { x }}
}

public func repeat<T>(x: T, count: Int) -> SequenceOf<T> {
  return SequenceOf {_ -> GeneratorOf<T> in
    var i = 0
    return GeneratorOf { (i++ < count) ? x : nil }
  }
}

// extension SequenceOf { var array:[T] { return Array(self) } }
// repeat(1, 10).array.count //=> 10