On 1 Sep 2014, at 14:09, Dirk Eddelbuettel wrote:
And I think I was trying to explain to you that
- becase _R_ only knows double and
- does dispatch by _name_ only
there is no clean way in which _Rcpp_ can maintain these as two
distinct
versions under the same name. In short, just because you can template
at the
C++ level does not mean that Rcpp can shoehorn both variants up to
R-accessibility.
OK either, I'm being dense or it looks Like I still wasn't clear (or
both!). I have:
a templated C++ class (WKNN)
typedefs for T=double (WKNND) and T=float (WKNNF)
RCppModules wrappers for WKNND and WKNNF for R producing separate R
reference classes with _different_ names. Here is a stripped down
version of the code:
template<typename T>
struct WKNN {
public:
WKNN(const Eigen::Map<Eigen::MatrixXd> data, bool buildtree=true);
// other methods ...
private:
Eigen::Matrix<T, Dynamic, Dynamic> data_pts;
}
typedef WKNN<double> WKNND;
RCPP_MODULE(class_WKNND) {
class_<WKNND>( "WKNND" )
.constructor<Eigen::Map<Eigen::MatrixXd> >()
// other methods ...
;
}
typedef WKNN<float> WKNNF;
RCPP_MODULE(class_WKNNF) {
class_<WKNNF>( "WKNNF" )
.constructor<Eigen::Map<Eigen::MatrixXd> >()
// other methods ...
;
}
Do you see any reason why this shouldn't be workable with RcppModules?
The only thing that is odd is that I have:
template<typename T>
struct WKNN
not
template<typename T>
class WKNN
because you can't seem to do this:
typedef WKNN<float> WKNNF;
when using the class keyword rather than struct. But perhaps this is the
origin of the problem – i.e. if RcppModules somehow depends
specifically on the use of the class keyword even though struct should
be equivalent (apart from default access rules). I believe that you can
directly typedef a class in C++11 so perhaps I should be insisting on
C++11.
Many thanks again for your input,
Greg.
--
Gregory Jefferis, PhD Tel: 01223 267048
Division of Neurobiology
MRC Laboratory of Molecular Biology
Francis Crick Avenue
Cambridge Biomedical Campus
Cambridge, CB2 OQH, UK
http://www2.mrc-lmb.cam.ac.uk/group-leaders/h-to-m/g-jefferis
http://jefferislab.org
http://flybrain.stanford.edu
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