[R-pkg-devel] Calling R's tempdir() from C

Rodrigo Tobar rtob@r @ending from icr@r@org
Fri Aug 10 16:07:25 CEST 2018


On 10.08.18 3:10 PM, Duncan Murdoch wrote:
> On 10/08/2018 12:01 AM, Rodrigo Tobar wrote:
>> [...]
> Why not pass the result of tempdir() in your call from R to your C++ 
> function, or in an initialization call for your package?  It won't 
> change during a session.

This is indeed a good suggestion, but (my bad!) I forgot to mention: the 
place I need to use this is at dynlib loading time (i.e., when 
R_init_mypackage is called), so I don't have the flexibility to pass 
arbitrary arguments.

I guess this is a separate but related question, but it's not clear to 
me if in the process of loading a package, any particular piece of R 
code is guaranteed to execute before the library is loaded; otherwise I 
could pass down the information by setting an environment variable in R 
and read it from C++, or even perform all the directory creation logic 
at the R level.

Thanks again,


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