Hi Colin, Does the code you shared run? If not, how does it fail? One guess is that you're probably getting undefined symbols errors because you need more than just -larrow. See https://github.com/apache/arrow/blob/master/r/configure#L35 for others you need, and depending on how you installed arrow, you likely also need -larrow_bundled_dependencies.
Neal On Mon, Oct 12, 2020 at 1:49 AM Colin McLean <cmcle...@staffmail.ed.ac.uk> wrote: > Dear Arrow users, > > I was wondering if anyone can help me understand how I can create an > arrow::Array object in R, then pass this into C++ (using the Rcpp > library) for both reading and writing too? Similar what is done using > the R bigmemory > (https://privefl.github.io/blog/Tip-Optimize-your-Rcpp-loops/) or > bigstatsr packages. > > Kindest Regards, > Colin Mclean. > > R script: > library(Rcpp) > library(arrow) > > ## compile c++ code > Sys.setenv("PKG_CXXFLAGS" = "-larrow") > sourceCpp("utils.cpp") > > N = 10 > X = arrow::Array$create(rep(0,N*N)) > > test( X$pointer() ) > > > utils.cpp: > // define headers > // [[Rcpp::plugins(cpp11)]] > // [[Rcpp::depends(arrow)]] > > #include <arrow/api.h> > #include <arrow/array.h> > #include <arrow/array/array_base.h> > #include <Rcpp.h> > #include <stdio.h> > #include <iostream> > #include <string> > > > using namespace Rcpp; > using namespace std; > > // [[Rcpp::export]] > void test( XPtr<arrow::Array> aAPtr ){ > > cout << "read & write arrow::Array in test " << endl; > cout << aAPtr << endl; > > } > > -- > The University of Edinburgh is a charitable body, registered in > Scotland, with registration number SC005336. > > >
