[Rcpp-devel] Using Rcpp without R in a main() function

[Romain Francois]

Hello,

Rcpp is for calling C++ code from R. Why did you think you can use it 
without R ?

Have a look at RInside, which will let you embed R in a c++ application. 
But no miracle there either, you will still need R.

Romain

Le 07/11/12 10:12, Josh.Bowden at csiro.au a écrit :
> Hi,
>
> I am trying to test some code and in doing so I want to call the code from a main() function. The test code is as follows:
>
> #include <Rinternals.h>
> #include <Rcpp.h>
> #include <iostream>
> #include <fstream>
>
> int main(int argc, char* argv[])
> {
> 	Int arraySize = 1689 ;
> 	// read in the test data
> //	Rcpp::NumericVector Avec(arraySize * arraySize) ;  // code fails here on initialisation
> 	std::vector<double> Amat(arraySize * arraySize) ;
> 	std::ifstream arrayData("/home/array.bin", std::ios::in | std::ios::binary); // File Open
>   	if(!arrayData){Rcpp::Rcout << "ERROR";exit(1);}
>      	for(int t1=0; t1 < arraySize; t1++)
>      	{
> 		for(int t2=0; t2 < arraySize; t2++)
>     		{
> 			// arrayData << Amat(t1,t2) << "\t" ;
> 			double tdouble  ;
>          		arrayData.read((char*) &tdouble, sizeof(double) ) ; //Reads array from binary file
> 			Amat[t1 * arraySize + t2] = tdouble ;
> 		}
>      	}
> 	arrayData.close() ;
>
> 	Rcpp::NumericVector xx(arraySize * arraySize); // or code fails here on initialisation
>
> 	return 0 ;
> 	
> }
>
> I compile using the following:
> icpc -I/apps/R/2.15.1/lib64/R/include -I"/home/bow355/R/library/Rcpp/include" -O0 -g -fp-model precise  main.cpp -L/home/bow355/R/library/Rcpp/lib -lRcpp
>
> When I run the executable it seg faults at the initialisation of Rcpp::NumericVector objects.
> I have tested the function body with inline and it compiles and runs perfectly.
>
> Is there something I should specify so that the Rcpp library objects initialise correctly?
>
> Thanks a lot for any feedback,
> Josh


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Romain Francois
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