\name{getExternalStorage}
\alias{getExternalStorage}
\title{ Extract external storage}
\description{
  This generic extracts the "externalStorage" object associated with an
  "externalVector" object.
}
\usage{
getExternalStorage(x)
}
\arguments{
  \item{x}{ An "externalVector" object. }
}
\value{
  An "externalStorage" object.
}
\seealso{ \code{\link{externalStorage-class}},
  \code{\link{externalVectorWithStorage-class}} }
\keyword{classes}