[Rcpp-devel] Preferred way to create an instance of a C++ class exported in a module?

I'd say up to you. I prefer the new( Class , ?... ) construct.

Also, with Rcpp 0.8.9 with populate, you dont need to use the $ so much.

You can, in your .onLoad call populate once and then just use the class. See the Rcpp-modules vignette.

Is there a PDF of a recent version of the Rcpp-modules vignette online
somewhere?  I get a segfault when trying to build it during the
package build process (svn revision 2624)

cp -f Rcpp-modules/Rcpp-modules.Rnw .
Rscript --vanilla -e "require(highlight); driver <-
HighlightWeaveLatex(boxes = TRUE, bg = 'white' ); Sweave(
'Rcpp-modules.Rnw', driver = driver ); "
WARNING: ignoring environment value of R_HOME
Loading required package: highlight
Loading required package: tools
Loading required package: codetools
Loading required package: parser
Loading required package: Rcpp

 *** caught segfault ***
address 0x2b43e97181d0, cause 'invalid permissions'

Traceback:
 1: .Call(Module__get_function, pointer, name)
 2: .get_Module_function(module, fun, xp)
 3: Module(module, mustStart = TRUE)
 4: .getModulePointer(x)
 5: module$set_data_path
 6: module$set_data_path
 7: fun(...)
 8: doTryCatch(return(expr), name, parentenv, handler)
...

Romain



Le 30 nov. 2010 ? 05:21 PM, Douglas Bates <bates at stat.wisc.edu> a ?crit :

I have seen a couple of ways of creating an instance of a C++ class
exported in a module

mod <- Module("myMod", "myPackage")
cls <- mod$myClass
inst <- cls$new(constructorArgs)

and

inst <- new(mod$myClass, constructorArgs)

Is one of these the preferred way?

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