[Rd] internal manipulation of ...

Simon Urbanek simon.urbanek at r-project.org
Fri Dec 13 00:15:21 CET 2013

On Dec 12, 2013, at 3:32 PM, Romain François <romain at r-enthusiasts.com> wrote:

> Hello, 
> I’m looking for examples on how to manipulate the ... internally, e.g. in a .Call or .External function. 
> I’m particularly interested in accessing the environment in which each contribution to ... can be evaluated. 

Arguments in ... are evaluated *before* being passed down to .Call/.External so there is no ... by the time you enter the C code. AFAIR R doesn't allow you to get at the promises outside of internal code, so you either get the call or the values, but nothing in between.


> So far, I’m using tricks involving passing down the sys.calls() and sys.frames() down to the C function. The documentation in http://cran.r-project.org/doc/manuals/R-ints.html#Dot_002ddot_002ddot-arguments did not help me a lot. 
> Romain
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