[Rcpp-devel] Not able to convert from Rcpp::NumericVector to Teuchos::ArrayRCP<size_t>

[Chaomei Lo]

Hi, Romain,

Your suggestion works pretty well.  I appreciate your valuable help !

Chaomei


On Thu, May 22, 2014 at 4:18 PM, Romain François
<romain at r-enthusiasts.com>wrote:

> Hello,
>
> From what I understand of ArrayRCP, having read the documentation for a
> few minutes. (
> http://trilinos.sandia.gov/packages/docs/r9.0/packages/teuchos/doc/html/classTeuchos_1_1ArrayRCP.html
> )
> This looks like a vector and therefore it is likely that the default
> Exporter<T> will not be useful as it tries to use the constructor taking a
> SEXP :
>
> template <typename T>
> class Exporter{
> public:
>     Exporter( SEXP x ) : t(x){}
>     inline T get(){ return t ; }
>
> private:
>     T t ;
> } ;
>
> you can use a RangeExporter instead which looks more compatible to what
> ArrayRCP looks like:
>
> template <typename T> class RangeExporter {
> public:
>     typedef typename T::value_type r_export_type ;
>
>     RangeExporter( SEXP x ) : object(x){}
>     ~RangeExporter(){}
>
>     T get(){
>         T vec( ::Rf_length(object) );
>         ::Rcpp::internal::export_range( object, vec.begin() ) ;
>         return vec ;
>     }
>
> private:
>     SEXP object ;
> } ;
>
>
> You can probably do this by having something like this early enough (after
> RcppCommon.h but before Rcpp.h).
>
> namespace Rcpp {
> namespace traits {
>
>   template <typename T> class Exporter<  Teuchos::ArrayRCP<T> > : public
> RangeExporter< Teuchos::ArrayRCP<T> >{
>   public:
>     Exporter( SEXP x) : RangeExporter< Teuchos::ArrayRCP<T> >(x){}
>   }
>
> }
> }
>
>
> Romain
>
> Le 23 mai 2014 à 00:42, Chaomei Lo <chaomeilo at gmail.com> a écrit :
>
> Sorry to confuse you, Dirk, I had my previous message title wrong.  Here
> below was the message with the correct title and content.
>
> ////////////////////////////////
> I have created R packages using Makevars and it works pretty good for me.
> I am able to convert from a Rcpp::NumericVector to std::vector as in below.
>
>
>
>
> *NumericVector col_cts = buildMatrix(Xr);vector<long unsigned int>
> col_counts = Rcpp::as<vector<long unsigned int>>(col_cts);  *
> Now I am having a problem with an application involves the Trilinos
> library. Here below I am trying to convert a Rcpp::NumericVector to
> Teuchos::ArrayRCP<size_t> in the following line, it gave me errors as shown
> below in red.  Would you please help me with this ?
>
> *Teuchos::ArrayRCP<size_t>
> col_counts=Rcpp::as<Teuchos::ArrayRCP<size_t>>(col_cts);*
>
> Thanks a lot.
>
> In file included from
> /share/apps/R/3.0.2/lib64/R/library/Rcpp/include/Rcpp/as.h:25:0,
>                  from
> /share/apps/R/3.0.2/lib64/R/library/Rcpp/include/RcppCommon.h:169,
>                  from
> /share/apps/R/3.0.2/lib64/R/library/Rcpp/include/Rcpp.h:27,
>                  from buildMatrix.cpp:4:
> /share/apps/R/3.0.2/lib64/R/library/Rcpp/include/Rcpp/internal/Exporter.h:
> In constructor 'Rcpp::traits::Exporter<T>::Exporter(SEXP) [with T =
> Teuchos::Array
> RCP<long unsigned int>, SEXP = SEXPREC*]':
> /share/apps/R/3.0.2/lib64/R/library/Rcpp/include/Rcpp/as.h:79:51:
> instantiated from 'T Rcpp::internal::as(SEXP,
> Rcpp::traits::r_type_generic_tag) [with T =
>  Teuchos::ArrayRCP<long unsigned int>, SEXP = SEXPREC*]'
> /share/apps/R/3.0.2/lib64/R/library/Rcpp/include/Rcpp/as.h:144:84:
> instantiated from 'T Rcpp::as(SEXP) [with T = Teuchos::ArrayRCP<long
> unsigned int>, SEXP
>  = SEXPREC*]'
> buildMatrix.cpp:84:87:   instantiated from here
> /share/apps/R/3.0.2/lib64/R/library/Rcpp/include/Rcpp/internal/Exporter.h:31:31:
> error: invalid conversion from 'SEXP' to 'long int' [-fpermissive]
> /people/d3j508/trilinos-11.6.1/trilinos-11.6.1_Install/include/Teuchos_ArrayRCP.hpp:129:1:
> error:   initializing argument 1 of 'Teuchos::ArrayRCP<T>::ArrayRC
> P(Teuchos::ArrayRCP<T>::size_type, const T&) [with T = long unsigned int,
> Teuchos::ArrayRCP<T>::size_type = long int]' [-fpermissive]
> make: *** [buildMatrix.o] Error 1
> ERROR: compilation failed for package 'Tpkg'
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