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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple style='tab-interval:.5in'><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D'>Thanks.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D'>It seems from my quick reading that there are ways around the GC issue, this is done for the "External Pointer" type as I understand it, so that might not be insurmountable. <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D'>On the other hand, it might not be possible to separate GC from R lifetime for the vector type (<span class=SpellE>ie</span> REALSXP). That's where more knowledge of R internals is needed than I at the moment possess.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D'>Steve<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal style='margin-left:.5in'><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-font-family:"Times New Roman"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-font-family:"Times New Roman"'> dmbates@gmail.com [mailto:dmbates@gmail.com] <b>On Behalf Of </b>Douglas Bates<br><b>Sent:</b> Tuesday, June 11, 2013 11:58 AM<br><b>To:</b> Steve Jaffe<br><b>Cc:</b> rcpp-devel@lists.r-forge.r-project.org<br><b>Subject:</b> Re: [Rcpp-devel] returning array from C<o:p></o:p></span></p><p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p><div><p class=MsoNormal style='margin-left:.5in'>On Tue, Jun 11, 2013 at 10:51 AM, Steve Jaffe <<a href="mailto:sjaffe@riskspan.com" target="_blank">sjaffe@riskspan.com</a>> wrote:<o:p></o:p></p><div><div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;mso-border-left-alt:solid #CCCCCC .75pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in'><p class=MsoNormal style='margin-left:.5in'>Is there a way to 'wrap', say, an array of double allocated on the heap in C/C++ and return it to R without copying, ie as the data inside a REALSXP?<o:p></o:p></p></blockquote><div><p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'>I don't know of any way of doing that. R is very possessive about memory and expects to be able to garbage-collect any memory allocated in an SEXPREC.<o:p></o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'> <o:p></o:p></p></div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;mso-border-left-alt:solid #CCCCCC .75pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in'><p class=MsoNormal style='margin-left:.5in'>(Let's say for example that this array allocation is in a 3rd-party library which can't be modified)<br><br>Looking at the 'wrap' code it appears that copying is done in all cases (except for the 'external pointer').<o:p></o:p></p></blockquote><div><p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'>Yes. The only way to avoid copying is if the external library allows objects to be constructed from pre-allocated memory. This is used in the RcppArmadillo and RcppEigen packages.<o:p></o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'> <o:p></o:p></p></div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;mso-border-left-alt:solid #CCCCCC .75pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in'><p class=MsoNormal style='margin-left:.5in'><br>Clearly the memory ownership issue is one that would need to be handled. Handing over ownership to R would seem the simplest approach. But it would be more interesting to be able to integrate with something like boost::shared_array so that the lifetime would be correctly managed across both the C and R environments.<br><br>I've read through Rcpp documentation and "Writing R Extensions" without coming up with a good answer, but I'm new to this and I suspect someone familiar with R internals (unlike me) would immediately see what was involved.<br><br>Thanks for your help.<br><br>Steve<br><br><br>_______________________________________________<br>Rcpp-devel mailing list<br><a href="mailto:Rcpp-devel@lists.r-forge.r-project.org">Rcpp-devel@lists.r-forge.r-project.org</a><br><a href="https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/rcpp-devel" target="_blank">https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/rcpp-devel</a><o:p></o:p></p></blockquote></div><p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p></div></div></div></body></html>