On 14.09.2018 05:17, Simon Woodward wrote: > I am developing a simulation model in C++ and I want to expose it to R for > testing. The model is in a C++ class and uses the boost::odeint library for > numerical integration. I am also using an unordered_map to expose the model > variables to the user. > I am having some trouble exposing the class functionality to C++, either as > separate // [[Rcpp::export]] methods or using RCPP_MODULE. The following code > successfully instantiates the model and returns the unordered_map but crashes > Rcpp if I try to access the advance(t,dt) method.
What do you mean with "crashes Rcpp"? On my system it mearly gives a
compiler error:
/usr/include/c++/6/bits/stl_iterator_base_funcs.h: In instantiation of
‘void std::advance(_InputIterator&, _Distance) [with _InputIterator =
Rcpp::InputParameter<double>; _Distance = Rcpp::InputParameter<double>]’:
> # sample code embedded in an R script
With the given ratio of C++ to R code it would have been better to use a
C++ file with R code embedded via /*** R ... */.
> library(Rcpp)
>
> Sys.setenv("PKG_CXXFLAGS"='-I"C:/boost/boost_1_66_0"')
The BH package can help with that:
// [[Rcpp::depends(BH)]]
> sourceCpp(code='
> #include <unordered_map>
> #include <string>
> #define BOOST_CONFIG_SUPPRESS_OUTDATED_MESSAGE
> #include <boost/numeric/odeint.hpp>
> #include <Rcpp.h>
>
> // Enable C++11 via this plugin (Rcpp 0.10.3 or later)
> // [[Rcpp::plugins(cpp11)]]
>
> using namespace std;
The above quoted error message indicates that your advance method and
std::advance are getting mixed up. Remove this "using namespace std;"
and handle to resulting errors by using "std::" or "using std::...;".
BTW, for larger pieces of code I would also get rid of "using namespace
Rcpp;".
cheerio
ralf
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