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\description{ The classes described  here are used by the R function
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\description{ The classes described  here are used by the R function
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  \code{\link{trace}} to create versions of functions and methods
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  \code{\link{trace}} to create versions of functions and methods
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  including browser calls, etc., and also to \code{\link{untrace}} the
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  including browser calls, etc., and also to \code{\link{untrace}} the
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  same objects.}
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  same objects.}
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\section{Objects from the Class}{
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\section{Objects from the Class}{
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Objects will be created from these classes by calls to \code{trace}.
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  Objects will be created from these classes by calls to \code{trace}.
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(There is an \code{\link{initialize}} method for class
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  (There is an \code{\link{initialize}} method for class
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\code{"traceable"}, but you are unlikely to need it directly.)
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  \code{"traceable"}, but you are unlikely to need it directly.)
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}
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}
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\usage{
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\usage{
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### Objects from the following classes are generated
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### Objects from the following classes are generated
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### by calling trace() on an object from the corresponding
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### by calling trace() on an object from the corresponding
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### class without the "WithTrace" in the name.
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### class without the "WithTrace" in the name.
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"traceable"
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"traceable"
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}
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}
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\section{Slots}{
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\section{Slots}{
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  \describe{
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  \describe{
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    \item{\code{.Data}:}{The data part, which will be \code{"function"}
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    \item{\code{.Data}:}{The data part, which will be \code{"function"}
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      for class \code{"functionWithTrace"}, and similarly for the other classes.  }
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      for class \code{"functionWithTrace"}, and similarly for the other
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      classes.}
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    \item{\code{original}:}{Object of the original class; e.g.,
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    \item{\code{original}:}{Object of the original class; e.g.,
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      \code{"function"} for class \code{"functionWithTrace"}. }
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      \code{"function"} for class \code{"functionWithTrace"}. }
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  }
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  }
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}
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}
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\section{Extends}{
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\section{Extends}{
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Each of the classes extends the corresponding untraced class, from the data part; e.g.,
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  Each of the classes extends the corresponding untraced class, from the
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\code{"functionWithTrace"} extends \code{"function"}.
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  data part; e.g., \code{"functionWithTrace"} extends \code{"function"}.
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Each of the specific classes extends \code{"traceable"}, directly,
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  Each of the specific classes extends \code{"traceable"}, directly,
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and class \code{"VIRTUAL"}, by class "traceable".
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  and class \code{"VIRTUAL"}, by class \code{"traceable"}.
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}
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}
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\section{Methods}{
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\section{Methods}{
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The point of the specific classes is that objects generated from them,
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  The point of the specific classes is that objects generated from them,
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by function \code{trace()}, remain callable or dispatchable, in addition
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  by function \code{trace()}, remain callable or dispatchable, in
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to their new trace information.
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  addition to their new trace information.
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}
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}
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\seealso{ function \code{\link{trace}} }
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\seealso{ function \code{\link{trace}} }
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\keyword{classes}
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\keyword{classes}