Create a Skeleton File for a New Method

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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 (previously assigned) function.

Usage

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

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".

To write multiple method skeletons to one file, open the file connection first and then pass it to method.skeleton() in multiple calls.

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, with separating underscores.

where

The environment in which to look for the function; by default, the top-level environment of the call to method.skeleton.

Value

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

See Also

setMethod, package.skeleton

Examples

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setClass("track", slots = c(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)

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