multSubscript.Swift

extension CollectionType {
  subscript (inds: [Index]) -> [Generator.Element] { return inds.map{self[$0]} }
  subscript (inds: Index...) -> [Generator.Element] { return inds.map{self[$0]} }
}
extension MutableCollectionType {
  subscript (inds: [Index]) -> [Generator.Element] {
    get { return inds.map{self[$0]} }
    set(els) { for (ind, val) in zip(inds, els) { self[ind] = val } }
  }
  subscript (inds: Index...) -> [Generator.Element] {
    get { return inds.map{self[$0]} }
    set(els) { for (ind, val) in zip(inds, els) { self[ind] = val } }
  }
}