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}
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}
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\usage{
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\usage{
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setClassUnion(name, members, where)
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setClassUnion(name, members, where)
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isClassUnion(Class)
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isClassUnion(Class)
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}
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}
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%- maybe also 'usage' for other objects documented here.
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\arguments{
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\arguments{
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  \item{name}{ the name for the new union class. }
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  \item{name}{ the name for the new union class. }
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  \item{members}{ the classes that should be members of this union.}
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  \item{members}{ the classes that should be members of this union.}
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  \item{where}{ where to save the new class definition; by default,
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  \item{where}{ where to save the new class definition; by default,
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      the environment of the package in which the \code{setClassUnion}
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      the environment of the package in which the \code{setClassUnion}
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  \url{http://developer.r-project.org/methodsPackage.html} and the
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  \url{http://developer.r-project.org/methodsPackage.html} and the
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  pointers from that page.
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  pointers from that page.
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}
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}
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\examples{
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\examples{
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## a class for either numeric or logical data
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## a class for either numeric or logical data
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setClassUnion("maybeNumber", c("numeric", "logical"))
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setClassUnion("maybeNumber", c("numeric", "logical"))
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## use the union as the data part of another class
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## use the union as the data part of another class
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setClass("withId", representation("maybeNumber", id = "character"))
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setClass("withId", representation("maybeNumber", id = "character"))