[R] Can the environment of a function be specified when the function is defined?

[Uwe Ligges]

I doubt what you have in mind makes too much sense, but changing the 
environment of a function foo to and environment env can be done using

environment(foo) <- env

Uwe Ligges



On 12.08.2011 16:45, Frederic F wrote:
> Hello,
>
> Is there a syntax to set the environment of a function when this function is
> defined?
>
> The best I could come up with so far is using a wrapper function:
>
> foo_internals<- function(x) {"Code of the function"}
>
> foo<- function(x) {
>    environment(foo_internals)<-as.environment(target_environment)
>    foo_internals(x)
> }
>
> But I would like to know if there is a cleaner syntax.
>
> There are two reasons why I would like to have a function defined with an
> environment different then the local one:
> The first is to develop a function that will go in a package: there might be
> more things loaded in my R_GlobalEnv than what will be available to the
> function when its environment will be the namespace of the package, so I
> would like to restrict right away the environment of the function that I
> develop in my local enviroment to what will be their environment in 'real
> life'.
> The other reason would be to have a function written in a package act as if
> it was from another package by giving it the environment of this other
> package.
>
> Thanks for your suggestions and comments,
>
> Frederic
>
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