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\name{VersionsNull}
\docType{class}
\alias{VersionsNull-class}
\alias{VersionsNull}
\alias{initialize,VersionsNull-method}
\alias{show,VersionsNull-method}
\title{Class "VersionsNull"}
\description{
A class used to represent the `version' of unversioned
objects. Useful primarily for method dispatch.
}
\section{Methods}{
The following are defined; package developers may write additional methods.
\describe{
\item{\code{new("VersionsNull", ...)}}{Create a new
\code{VersionsNull-class} instance, ignoring any additional arguments.}
\item{\code{show(object)}}{Display ``No version''.}
}
}
\author{Biocore}
\seealso{
\code{\link{classVersion}}
}
\examples{
obj <- new("VersionsNull")
obj
obj <- new("VersionsNull", A="1.0.0") # warning
obj
}
\keyword{classes}
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