Rolf Turner <r.tur...@auckland.ac.nz> writes:
> On 7/04/2009, at 3:34 PM, Ken-JP wrote:
>
> <snip>
>
>> Using NAMESPACE, I was able to hide my globals behind a "." (eg
>> .myGlobal
>> <<- 72) and use exportPattern("^[^\\.]*") to prevent users from
>> seeing my
>> globals, yet I was able to access their values inside my package.
>
> <snip>
>
> WHY do you want to ``prevent users from seeing [your] globals''?
>
> The whole point of R (well, maybe not the whole point, but a major
> point) is to be adaptable. If something doesn't work the way a user
> wants, then the user can change things. When the inner workings
> are hidden so deeply that the user can't see what to change, this
> becomes effectively impossible, and the user might as well go and
> use SAS.
>
> I exaggerate but slightly.
>
> Nevertheless, this syndrome of hiding things and making them
> effectively
> inaccessible --- which seems to have become an obsession with some
ls(getNamespace("<pkg>"), all=TRUE)
gets all the symbol names.
<pkg>:::symbol
gets non-exported values. What does the 'user' get in return? A
cleaner interface to the important functionality of the package,
faster symbol lookup, reduced opportunities for symbol masking between
packages. And with use of Imports:, unambiguous symbol look-up within
the package and shorter symbol search path.
Martin
> of the
> R community, particularly many of the senior members --- bugs the
> living
> Drambuie out of me.
>
> cheers,
>
> Rolf Turner
>
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--
Martin Morgan
Computational Biology / Fred Hutchinson Cancer Research Center
1100 Fairview Ave. N.
PO Box 19024 Seattle, WA 98109
Location: Arnold Building M1 B861
Phone: (206) 667-2793
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