R help - Aug 2011 - Can the environment of a function be specified when the function is defined?

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

--
View this message in context:
http://r.789695.n4.nabble.com/Can-the-environment-of-a-function-be-specified-when-the-function-is-defined-tp3739482p3739482.html
Sent from the R help mailing list archive at Nabble.com.

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
>
> --
> View this message in context:
http://r.789695.n4.nabble.com/Can-the-environment-of-a-function-be-specified-when-the-function-is-defined-tp3739482p3739482.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.