method.skeleton {methods}R Documentation

Create a Skeleton File for a New Method

Description

This function writes a source file containing a call to setMethod to define a method for the generic function and signature supplied. By default the method definition is in line in the call, but can be made an external function assigned in the same source file.

Usage

method.skeleton(generic, signature, file, external = FALSE)

Arguments

generic the character string name of the generic function, or the generic function itself. In the first case, the function need not currently be a generic, as it would not for the resulting call to setMethod.
signature the method signature, as it would be given to setMethod
file a character string name for the output file, or a writable connection. By default the generic function name and the classes in the signature are concatenated, with separating underscore characters. The file name should normally end in ".R".
external flag to control whether the function definition for the method should be a separate external object assigned in the source file, or included in line in the call to setMethod. If supplied as a character string, this will be used as the name for the external function; by default the name concatenates the generic and signature names, as in the example below.

Value

The file argument, invisibly, but the function is used for its side effect.

See Also

setMethod, package.skeleton

Examples

## Not run: 
setClass("track", representation(x ="numeric", y="numeric"))
method.skeleton("show", "track")  ## writes show_track.R
method.skeleton("Ops", c("track", "track")) ##writes "Ops_track_track.R"
## write multiple method skeletons to one file
con = file("./Math_track.R", "w")
method.skeleton("Math", "track", con)
method.skeleton("exp", "track", con)
method.skeleton("log", "track", con)
close(con)
## End(Not run)

[Package methods version 2.5.0 Index]