R is already initialized using pointer of Rinside object

[zhaofeng-shu33]

I compile the following simple code in debian buster by

g++ -I/usr/lib/R/site-library/Rcpp/include -I/usr/lib/R/site-library/RInside/include -I/usr/share/R/include/ -L/usr/lib/R/site-library/Rcpp/libs/ -L/usr/lib/R/site-library/RInside/lib/ -lR -lRInside -l:Rcpp.so main01.cpp -o main01

#include <RInside.h>
int main() {
    RInside* rinside;
    rinside = new RInside();
    delete rinside;
    rinside = new RInside();
    delete rinside;
}

When I run the program, I get the console message "R is already initialized". I do not know which is wrong with my code.

[eddelbuettel]

This is documented (somewhere ...). You can only have one instance of RInside (per process, a constraint that comes down from how R is designed and set up) so your code is in fact wrong. And yes, you do call delete but R (and that is documented somewhere in their internals) does not do a perfect wind-down to be callable again). It is your responsilibility to create one RInside object and to hang on to it.

[zhaofeng-shu33]

Thanks for your suggestions.

[eddelbuettel]

RInside isn't exactly a brand new project so some of these things have come up before, but these days it's no longer as obvious where that was. I once tried what you tried to, and I think I documented it as a consequence but if you found it lacking ... well sorry. Suggestions welcome -- there are still several dozen examples in the package as is.