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      definition of the class of  \code{object}.}
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      definition of the class of  \code{object}.}
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}
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}
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\details{
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\details{
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  These operators support the formal classes of package \pkg{methods},
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  These operators support the formal classes of package \pkg{methods},
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  and are enabled only when package \pkg{methods} is loaded (as per
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  and are enabled only when package \pkg{methods} is loaded (as per
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  default).  See \code{\link{slot}} for further details.
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  default).  See \code{\link{slot}} for further details, in particular
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  for the differences between \code{slot()} and the \code{@} operator.
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  It is checked that \code{object} is an S4 object (see
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  It is checked that \code{object} is an S4 object (see
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  \code{\link{isS4}}), and it is an error to attempt to use \code{@} on
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  \code{\link{isS4}}), and it is an error to attempt to use \code{@} on
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  any other object.  (There is an exception for name \code{.Data} for
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  any other object.  (There is an exception for name \code{.Data} for
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  internal use only.)  The replacement operator checks that the slot
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  internal use only.)  The replacement operator checks that the slot