Le 22/11/12 16:25, Hadley Wickham a écrit :
#define DISPATCH_METHOD(method, x) \ switch( TYPEOF(x) ){ \ case REALSXP: \ return method<REALSXP>(x); \ case INTSXP: \ return method<INTSXP>(x); \ case STRSXP: \ return method<STRSXP>(x); \ case LGLSXP: \ return method<LGLSXP>(x); \ default: \ Rf_error("Unsupported type"); \ return x; \ }Why do we need a macro here? Is it not possible to pass in method as a function? It seems like there must be a more elegant way to do dynamic dispatch. Hadley
Unfortunately, there is not. The issue is that we don't know the type of x at compile type, so we have to do this switch dance and trigger explicit instanciations of all method<> overloads.
There is no other way I know about. Romain -- Romain Francois Professional R Enthusiast +33(0) 6 28 91 30 30 R Graph Gallery: http://gallery.r-enthusiasts.com `- http://bit.ly/SweN1Z : SuperStorm Sandy blog: http://romainfrancois.blog.free.fr |- http://bit.ly/RE6sYH : OOP with Rcpp modules `- http://bit.ly/Thw7IK : Rcpp modules more flexible _______________________________________________ Rcpp-devel mailing list Rcpp-devel@lists.r-forge.r-project.org https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/rcpp-devel
