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  These functions check for either a method or a class that has been
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  These functions check for either a method or a class that has been
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  \dQuote{sealed} when it was defined, and which therefore cannot be
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  \dQuote{sealed} when it was defined, and which therefore cannot be
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  re-defined.
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  re-defined.
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}
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}
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\usage{
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\usage{
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isSealedMethod(f, signature, fdef)
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isSealedMethod(f, signature, fdef, where)
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isSealedClass(Class)
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isSealedClass(Class, where)
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}
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}
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\arguments{
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\arguments{
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  \item{f}{ The quoted name of the generic function. }
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  \item{f}{ The quoted name of the generic function. }
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  \item{signature}{ The class names in the method's signature, as
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  \item{signature}{ The class names in the method's signature, as
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  they would be supplied to \code{\link{setMethod}}. }
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  they would be supplied to \code{\link{setMethod}}. }
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  \item{fdef}{ Optional, and usually omitted:  the generic function
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  \item{fdef}{ Optional, and usually omitted:  the generic function
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      definition for \code{f}. }
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      definition for \code{f}. }
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  \item{Class}{The quoted name of the class.}
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  \item{Class}{The quoted name of the class.}
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  \item{where}{where to search for the method or class definition.  By
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    default, searches from the top environment of the call to
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    \code{isSealedMethod} or \code{isSealedClass}, typically the
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    global environment or the namespace of a package containing a call
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    to one of the functions.}
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}
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}
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\details{
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\details{
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  In the R implementation of classes and methods, it is possible to
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  In the R implementation of classes and methods, it is possible to
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  seal the definition of either a class or a method.  The basic
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  seal the definition of either a class or a method.  The basic
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  classes (numeric and other types of vectors, matrix and array data)
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  classes (numeric and other types of vectors, matrix and array data)