[R-pkg-devel] "multiple local function definitions for ‘FUN’ with different formal arguments"

Marius Hofert marius.hofert at uwaterloo.ca
Tue Jun 14 20:24:33 CEST 2016


I have a function A which calls a function B. B accepts an argument
'FUN' (a function). Depending on the choice of package, A constructs
FUN and passes it on to B:

A <- function(x, pkg = c("pkg1", "pkg2", "pkg3"), ...) {
    pkg <- match.arg(pkg)
    FUN <- switch(pkg,
    "pkg1" = {
        function(x, arg1, arg2) { }
    "pkg2" = {
        function(x, arg3, arg4, arg5) { }
    "pkg3" = {
        function(x, arg6) { }
    stop("Wrong 'pkg'"))
    B(x, pkg = pkg, FUN = FUN, ...)

Since different packages require a different structure of FUN, 'R CMD
check' shows:

* checking R code for possible problems ... NOTE
A: multiple local function definitions for ‘FUN’ with
  different formal arguments

I can avoid the note by using three different names for FUN and then
another switch once B is called...
... but is there a more elegant solution? Also, is this a 'critical'
note for package submission to CRAN?


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