[Rcpp-devel] Ease passing pointers

[Tim Keitt]

On Tue, Dec 31, 2013 at 3:10 PM, Dirk Eddelbuettel <edd at debian.org> wrote:

>
> On 31 December 2013 at 14:16, Tim Keitt wrote:
> | Can the following be simplified?
> |
> | (Typed in email, so not live code.)
> |
> | // [[Rcpp::export]]
> | void func(SEXP x)
> | {
> |   XPtr<aType> y(x);
> |   func2(&*y);
> |   y->memfunc();
> | }
> |
> | Is there a way to avoid the need to construct the XPtr in the 1st line?
> Hoping
> | for:
> |
> | // [[Rcpp::export]]
> | void func(aType* x)
> | {
> |   func2(x);
> |   x->memfunc();
> | }
>
> We don't know what func2() is, or what it's signature is. Ditto for y.
>
> In general, we go the route of using XPtr if we need to get the pointer
> back
> to R, maybe because our R logic then dispatches it somewhere else.
>
> Your examples are admiringly short, which is very good. They are also
> incomplete and a little incomprehensible which is less good :)
>
> Cheers, Dirk
>
> --
> Dirk Eddelbuettel | edd at debian.org | http://dirk.eddelbuettel.com
>

A little obscure indeed. I got a little lost in the documentation and was
looking for a shortcut. I think I need to specialize "wrap" and "as".

THK

-- 
Timothy H. Keitt
http://www.keittlab.org/
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