Having a little bit of trouble trying to get some c++ functions to export when I try to load them in from my R package. Running devtools::check() yields
> checking R code for possible problems ... NOTE
postRiverComp: no visible binding for global variable
‘_thmc_postRiverComp’
preFlopComp: no visible binding for global variable ‘_thmc_preFlopComp’
preRiverComp: no visible binding for global variable
‘_thmc_preRiverComp’
preTurnComp: no visible binding for global variable ‘_thmc_preTurnComp’
rcpp_hello_world: no visible binding for global variable
‘_thmc_rcpp_hello_world’
Undefined global functions or variables:
_thmc_postRiverComp _thmc_preFlopComp _thmc_preRiverComp
_thmc_preTurnComp _thmc_rcpp_hello_world
I think I've done a pretty good job writing Roxygen comments, so I must've used the wrong function somewhere that uses them. To be clear, I can library(thmc) and no errors are thrown, but no functions are exported. I can see this because when I type search() it yields
[1] ".GlobalEnv" "package:thmc" "devtools_shims" "tools:rstudio" "package:stats"
[6] "package:graphics" "package:grDevices" "package:utils" "package:datasets" "package:methods"
[11] "Autoloads" "org:r-lib" "package:base"
Here's my src/do_comps.cpp file:
#include <Rcpp.h>
#include "easy_header.h"
using namespace Rcpp;
//' Calculate pre-flop probability estimates
//'
//' @param your_cards your cards as a length-4 character vector.
//' @param num_sims number of simulations.
//' @param num_folders number of folders.
//' @param num_oppo number of opponents.
//' @export
// [[Rcpp::export]]
CharacterVector preFlopComp(CharacterVector your_cards, IntegerVector num_sims, IntegerVector num_folders,
IntegerVector num_oppo) {
unsigned int _num_folders = num_folders[0];
unsigned int _num_sims = num_sims[0];
unsigned int _num_oppo = num_oppo[0];
std::string val1 = Rcpp::as<std::string>(your_cards[0]);
std::string suit1 = Rcpp::as<std::string>(your_cards[1]);
std::string val2 = Rcpp::as<std::string>(your_cards[2]);
std::string suit2 = Rcpp::as<std::string>(your_cards[3]);
double percWon, percTie;
// construct simulator object and add folders
Simulator s(_num_sims, _num_oppo);
for(size_t i = 0; i < _num_folders; ++i)
s.addFolder();
// add your cards
s.addYouCard(Card::fromString(val1, suit1));
s.addYouCard(Card::fromString(val2, suit2));
// get final numbers
s.doSim(percWon, percTie);
return CharacterVector::create(s.prettyResults());
}
Note that it's got the two lines in the documentation file with the word "export." In R/RcppExports.R I have
# Generated by using Rcpp::compileAttributes() -> do not edit by hand
# Generator token: 10BE3573-1514-4C36-9D1C-5A225CD40393
#' Calculate pre-flop probability estimates
#'
#' @param your_cards your cards as a length-4 character vector.
#' @param num_sims number of simulations.
#' @param num_folders number of folders.
#' @param num_oppo number of opponents.
#' @export
preFlopComp <- function(your_cards, num_sims, num_folders, num_oppo) {
.Call(`_thmc_preFlopComp`, your_cards, num_sims, num_folders, num_oppo)
}
Maybe it's my NAMESPACE file. I've tried a few things for these. The most recent attempt was using advice I found here and here:
# Generated by roxygen2: do not edit by hand
importFrom(Rcpp, sourceCpp)
useDynLib(thmc, .registration=TRUE)
export(postRiverComp)
export(preFlopComp)
export(preRiverComp)
export(preTurnComp)
Running devtools::check() does change this file, though, by removing the importFrom and useDynLib calls. I have also tried adding the line exportPattern("^[[:alpha:]]+"), as per the suggestion in the official vignette, but it's of no use.
Also, I think I've checked all the boxes given by these answers here, still to no avail.
The importFrom and useDynLib calls in NAMESPACE are important. Either switch to a manually created NAMESPACE file or add
#' @useDynLib thmc, .registration = TRUE
#' @importFrom Rcpp evalCpp
to your roxygen2 code. Here with R-comments, since I would typically use thmc-package.R for this. You can also put this into do_comps.cpp when using C++-comments.