[Rcpp-devel] NULL value passed as symbol address

[Barth Riley]

Dear list

I a writing a package containing 2 C++ functions using Rcpp version 
1.00. I am using R version 3.5.3 and devtools version 2.0.2. I have had 
devtools/Rcpp generate the RcppExport.cpp and RcpExport.R files. The 
package compiles fine but when I attempt to call these C++ functions, I 
receive a NULL value passed as symbol address error. Below is my 
generated RcppExport.R file:


# Generated by using Rcpp::compileAttributes() -> do not edit by hand
# Generator token: 10BE3573-1514-4C36-9D1C-5A225CD40393

logit <- function(x, xMin, xMax, adjustment = 0.3) {
     .Call('_MFRM_logit', PACKAGE = 'MFRM', x, xMin, xMax, adjustment)
}

#'
#' count_valid
#' @name count_valid
#' @param x A vector of integer values, including missing values
#' @return An integer representing the number of unique non-missing 
values in x.
#' @export
#'
count_valid <- function(x) {
     .Call('_MFRM_count_valid', PACKAGE = 'MFRM', x)
}

*And here is RcppExport.cpp:*

// Generated by using Rcpp::compileAttributes() -> do not edit by hand
// Generator token: 10BE3573-1514-4C36-9D1C-5A225CD40393

#include <Rcpp.h>

using namespace Rcpp;

// logit
Rcpp::NumericVector logit(Rcpp::NumericVector x, Rcpp::NumericVector 
xMin, Rcpp::NumericVector xMax, double adjustment);
RcppExport SEXP _MFRM_logit(SEXP xSEXP, SEXP xMinSEXP, SEXP xMaxSEXP, 
SEXP adjustmentSEXP) {
BEGIN_RCPP
     Rcpp::RObject rcpp_result_gen;
     Rcpp::RNGScope rcpp_rngScope_gen;
     Rcpp::traits::input_parameter< Rcpp::NumericVector >::type x(xSEXP);
     Rcpp::traits::input_parameter< Rcpp::NumericVector >::type 
xMin(xMinSEXP);
     Rcpp::traits::input_parameter< Rcpp::NumericVector >::type 
xMax(xMaxSEXP);
     Rcpp::traits::input_parameter< double >::type 
adjustment(adjustmentSEXP);
     rcpp_result_gen = Rcpp::wrap(logit(x, xMin, xMax, adjustment));
     return rcpp_result_gen;
END_RCPP
}
// count_valid
int count_valid(IntegerVector x);
RcppExport SEXP _MFRM_count_valid(SEXP xSEXP) {
BEGIN_RCPP
     Rcpp::RObject rcpp_result_gen;
     Rcpp::RNGScope rcpp_rngScope_gen;
     Rcpp::traits::input_parameter< IntegerVector >::type x(xSEXP);
     rcpp_result_gen = Rcpp::wrap(count_valid(x));
     return rcpp_result_gen;
END_RCPP
}

static const R_CallMethodDef CallEntries[] = {
     {"_MFRM_logit", (DL_FUNC) &_MFRM_logit, 4},
     {"_MFRM_fitCurve", (DL_FUNC) &_MFRM_fitCurve, 10},
     {"_MFRM_count_valid", (DL_FUNC) &_MFRM_count_valid, 1},
     {NULL, NULL, 0}
};

RcppExport void R_init_MFRM(DllInfo *dll) {
     R_registerRoutines(dll, NULL, CallEntries, NULL, NULL);
     R_useDynamicSymbols(dll, FALSE);
}

Do the functions have to be sequentially numbered (1,2,3...) in the 
R_CallMethodDef structure? And are there any additional procedures 
required when compiling the package using the latest version of Rcpp?


Barth


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