search for: r_execwithcleanup

...has a 'open' and 'close' step, the same sort of issue will arise. What I believe we should do, and what Rcpp has made steps towards, is make it possible to interact with some subset of the R API safely from C++ contexts. This has always been possible with e.g. R_ToplevelExec() and R_ExecWithCleanup(), and now things are even better with R_UnwindProtect(). In theory, as a prototype, an R package could provide a 'safe' C++ interface to the R API using R_UnwindProtect() and friends as appropriate, and client packages could import and link to that package to gain access to the interface....

...up native objects in any 3rd party library that are created during the call. > What I believe we should do, and what Rcpp has made steps towards, is make it possible to interact with some subset of the R API safely from C++ contexts. This has always been possible with e.g. R_ToplevelExec() and R_ExecWithCleanup(), and now things are even better with R_UnwindProtect(). In theory, as a prototype, an R package could provide a 'safe' C++ interface to the R API using R_UnwindProtect() and friends as appropriate, and client packages could import and link to that package to gain access to the interface....

First, thank you to Tomas for writing his recent post[0] on the R developer blog. It raised important issues in interfacing R's C API and C++ code. However I do _not_ think the conclusion reached in the post is helpful > don?t use C++ to interface with R There are now more than 1,600 packages on CRAN using C++, the time is long past when that type of warning is going to be useful to the

...cts in any 3rd party library that are created during the call. > > >> What I believe we should do, and what Rcpp has made steps towards, is make it possible to interact with some subset of the R API safely from C++ contexts. This has always been possible with e.g. R_ToplevelExec() and R_ExecWithCleanup(), and now things are even better with R_UnwindProtect(). In theory, as a prototype, an R package could provide a 'safe' C++ interface to the R API using R_UnwindProtect() and friends as appropriate, and client packages could import and link to that package to gain access to the interface....

...t should be made clear that it was not what Tomas' blog was about. I agree with Tomas that it is safer to give an advice to not use C++ to call R API since C++ may give a false impression that you don't need to know what you're doing. Note that it is possible to avoid longjmps by using R_ExecWithCleanup() which can catch any longjmps from the called function. So if you know what you're doing you can make things work. I think the issue here is not necessarily lack of tools, it is lack of knowledge - which is why I think Tomas' post is so important. Cheers, Simon > On Mar 29, 2019, at...