The R Project SVN R

\name{TraceClasses}
\docType{class}
\alias{traceable-class}
\alias{functionWithTrace-class}
\alias{MethodDefinitionWithTrace-class}
\alias{MethodWithNextWithTrace-class}
\title{Classes Used Internally to Control Tracing }
\description{ The classes described  here are used by the R function
  \code{\link{trace}} to create versions of functions and methods
  including browser calls, etc., and also to \code{\link{untrace}} the
  same objects.}
\section{Objects from the Class}{
Objects will be created from these classes by calls to \code{trace}.
(There is an \code{\link{initialize}} method for class
\code{"traceable"}, but you are unlikely to need it directly.)
}
\usage{
### Objects from the following classes are generated
### by calling trace() on an object from the corresponding
### class without the "WithTrace" in the name.

"functionWithTrace"
"MethodDefinitionWithTrace"
"MethodWithNextWithTrace"

### the following is a virtual class extended by each of the
### classes above

"traceable"
}
\section{Slots}{
  \describe{
    \item{\code{.Data}:}{The data part, which will be \code{"function"}
      for class \code{"functionWithTrace"}, and similarly for the other classes.  }
    \item{\code{original}:}{Object of the original class; e.g.,
      \code{"function"} for class \code{"functionWithTrace"}. }
  }
}
\section{Extends}{
Each of the classes extends the corresponding untraced class, from the data part; e.g.,
\code{"functionWithTrace"} extends \code{"function"}.
Each of the specific classes extends \code{"traceable"}, directly,
and class \code{"VIRTUAL"}, by class "traceable".
}
\section{Methods}{
The point of the specific classes is that objects generated from them,
by function \code{trace()}, remain callable or dispatchable, in addition
to their new trace information.
}
\seealso{ function \code{\link{trace}} }

\keyword{classes}