[Rcpp-devel] Warning: Class "C++Object" is defin ed (with package slot ‘Rcpp’) but n o metadata object fo und

[Dirk Eddelbuettel]

Hi Alejandra,

On 30 July 2012 at 10:50, Alejandra Gonzalez-Beltran wrote:
| Dear Dirk,
| 
| Thanks for your reply.
| 
| Given that our package does not use Rcpp directly and after reading
| documentation/forums without finding a solution, it had seem to me that it was
| a generic warning and that there was no need to provide a pointer to the public
| repository with our code. 
| 
| After sending my message, I resolved the warning by adding Rcpp in the
| 'Depends' section of the DESCRIPTION file.

While I am very glad that your problem is solved, I have to say that this
makes little sense. If your package does not use Rcpp, it would have to
depend on it. But if you don't use Rcpp, you can't trigger the bug you
reported.  So may another package [ if you use one ] may be buggy and not
depend on Rcpp.  Impossible to say though from your incomplete report.

Dirk

| 
| Kind regards,
| 
| Alejandra
| 
| On 24 July 2012 14:48, Dirk Eddelbuettel <edd at debian.org> wrote:
| 
| 
|     Hi Alejandra.
| 
|     On 24 July 2012 at 14:11, Alejandra Gonzalez-Beltran wrote:
|     | Hi,
|     |
|     | When running R CMD INSTALL over our R package, I get the following
|     warning:
|     |
|     | Warning: Class "C++Object" is defined (with package slot ‘Rcpp’) but
|     no
|     | metadata object found to revise subclass information---not exported?
|      Making a
|     | copy in package ‘.GlobalEnv’
|     |
|     | (full output below)
|     |
|     | I am not importing Rcpp directly.
|     |
|     | Could you please provide any pointers on how to fix this warning?
| 
|     No. And you need to understand why: without a reproducible example there is
|     NOTHING we can do here but point you to
| 
|        the Rcpp-package vignette
| 
|        the Rcpp.package.skeleton() function and its help
| 
|        the sources of 73 existing CRAN packages using Rcpp
| 
|     to see how working packages are laid out.
| 
|     Regards,  Dirk
| 
|     | The output of sessionInfo() is included below.
|     |
|     | Thanks,
|     |
|     | Alejandra
|     |
|     |
|     | oerc-dynamic-226:R-packages agbeltran$ R CMD INSTALL ISA2R
|     | * installing to library ‘/Library/Frameworks/R.framework/Versions/2.15/
|     | Resources/library’
|     | * installing *source* package ‘ISA2R’ ...
|     | ** R
|     | ** inst
|     | ** preparing package for lazy loading
|     | Warning: Class "C++Object" is defined (with package slot ‘Rcpp’) but
|     no
|     | metadata object found to revise subclass information---not exported?
|      Making a
|     | copy in package ‘.GlobalEnv’
|     | ** help
|     | *** installing help indices
|     | ** building package indices
|     | ** installing vignettes
|     | ** testing if installed package can be loaded
|     | *** arch - i386
|     | During startup - Warning message:
|     | Class "C++Object" is defined (with package slot ‘Rcpp’) but no
|     metadata
|     | object found to revise subclass information---not exported?  Making a
|     copy in
|     | package ‘.GlobalEnv’ 
|     | *** arch - x86_64
|     | During startup - Warning message:
|     | Class "C++Object" is defined (with package slot ‘Rcpp’) but no
|     metadata
|     | object found to revise subclass information---not exported?  Making a
|     copy in
|     | package ‘.GlobalEnv’ 
|     |
|     | * DONE (ISA2R)
|     |
|     |
|     | > sessionInfo()
|     | R version 2.15.1 (2012-06-22)
|     | Platform: x86_64-apple-darwin9.8.0/x86_64 (64-bit)
|     |
|     | locale:
|     | [1] C/en_US.UTF-8/C/C/C/C
|     |
|     | attached base packages:
|     | [1] stats     graphics  grDevices utils     datasets  methods  
|     base  
|     |   
|     |
|     | other attached packages:
|     | [1] ISA2R_1.0.7        Biobase_2.17.6     BiocGenerics_0.3.0
|     |
|     | loaded via a namespace (and not attached):
|     | [1] Rcpp_0.9.13     codetools_0.2-8 mzR_1.3.8       tools_2.15.1  
|     |  xcms_1.33.13   
|     |
|     | ----------------------------------------------------------------------
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|     --
|     Dirk Eddelbuettel | edd at debian.org | http://dirk.eddelbuettel.com
| 
| 
| 
| 

-- 
Dirk Eddelbuettel | edd at debian.org | http://dirk.eddelbuettel.com