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% File src/library/methods/man/method.skeleton.Rd
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% Part of the R package, http://www.R-project.org
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ripley |
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% Copyright 1995-2007 R Core Team
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ripley |
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% Distributed under GPL 2 or later
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\name{method.skeleton}
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murdoch |
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\alias{method.skeleton}
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jmc |
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\title{Create a Skeleton File for a New Method}
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\description{
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maechler |
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This function writes a source file containing a call to
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\code{\link{setMethod}} to define a method for the generic function
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and signature supplied. By default the method definition is in line
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in the call, but can be made an external (previously assigned) function.
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jmc |
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}
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\usage{
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method.skeleton(generic, signature, file, external = FALSE, where)
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}
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\arguments{
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\item{generic}{the character string name of the generic function, or
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the generic function itself. In the first case, the function
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need not currently be a generic, as it would not for the
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resulting call to \code{\link{setMethod}}.}
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\item{signature}{the method signature, as it would be given to \code{\link{setMethod}}}
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\item{file}{a character string name for the output file, or a
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writable connection. By default the generic function name and
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the classes in the signature are concatenated, with separating
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underscore characters. The file name should normally end in \code{".R"}. }
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To write multiple method skeletons to one file, open the file
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connection first and then pass it to \code{method.skeleton()} in
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multiple calls.
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\item{external}{flag to control whether the function definition for
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the method should be a separate external object assigned in the
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source file, or included in line in the call to
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\code{\link{setMethod}}.
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If supplied as a character string, this will be used as the name
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for the external function; by default the name concatenates the
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generic and signature names, with separating underscores.}
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\item{where}{The environment in which to look for the function; by default,
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the top-level environment of the call to \code{method.skeleton}.}
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jmc |
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}
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\value{
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The \code{file} argument, invisibly, but the function is used for its side effect.
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}
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maechler |
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\seealso{\code{\link{setMethod}}, \code{\link{package.skeleton}}
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}
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\examples{
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maechler |
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\dontshow{oWD <- setwd(tempdir())}
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setClass("track", representation(x ="numeric", y="numeric"))
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method.skeleton("show", "track") ## writes show_track.R
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method.skeleton("Ops", c("track", "track")) ## writes "Ops_track_track.R"
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## write multiple method skeletons to one file
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maechler |
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con <- file("./Math_track.R", "w")
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jmc |
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method.skeleton("Math", "track", con)
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method.skeleton("exp", "track", con)
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method.skeleton("log", "track", con)
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close(con)
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maechler |
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\dontshow{setwd(oWD)}
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jmc |
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}
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\keyword{programming}
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\keyword{methods}
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