[Rd] Cross-platform function availability

[Duncan Murdoch]

On 9/15/2008 11:42 AM, hadley wickham wrote:
> Hi all,
> 
> Is there any way to determine which functions are available on which
> platforms?  For example, winProgr essBar (and related functions) are
> only available on Windows, but what about tkProgressBar and
> txtProgressBar?  Is there any way to figure out which functions are
> only available on certain platforms, without installing R on that
> platform and checking?

Generally I think the only reliable way is to look at the source. 
Things in "windows" subdirs, or marked off with "#ifdef windows" (in Rd) 
or "#ifdef Win32" (in C) are for windows only.  Probably our 
documentation should point out when something is platform-specific, and 
frequently it does, but I don't think it is completely consistent in this.

Duncan