[Rcpp-devel] why segmentation fault happens when I was trying to run complied examples in RInside "standard" folder

[Dirk Eddelbuettel]

On 4 December 2012 at 23:33, Cong Li wrote:
| Hi, Dirk
| 
| Ok, I see. I will try it.
| Thank you very much.
| And I am sorry for relying on the wrong place.

Thanks -- and here is a cleaner diff from rev4047. 

I found/fixed that very shortly after we rolled 0.10.2 (which fixed a real
rather than cosmetic error and had to be released).

As we said, this is purely cosmetic but a little irratice. Just rebuild Rcpp
with thus small change and all is well.

Dirk


Modified: pkg/Rcpp/inst/include/Rcpp/iostream/Rostream.h
===================================================================
--- pkg/Rcpp/inst/include/Rcpp/iostream/Rostream.h	2012-11-27 01:34:59 UTC (rev 4046)
+++ pkg/Rcpp/inst/include/Rcpp/iostream/Rostream.h	2012-11-27 14:21:42 UTC (rev 4047)
@@ -38,7 +38,12 @@
             std::ostream( new Rstreambuf(output) ), 
             buf( static_cast<Rstreambuf*>( rdbuf() ) )
         {}
-        ~Rostream(){ delete buf ; }
+        ~Rostream() { 
+            if (buf != NULL) {
+                delete buf; 
+                buf = NULL;
+            }
+        }
     };
     
     // declare global variable


| 
| Cong Li
| 
| On Tue, Dec 4, 2012 at 9:51 PM, Dirk Eddelbuettel <edd at debian.org> wrote:
| 
| 
|     Please reply on-list.
| 
|     On 4 December 2012 at 21:37, Cong Li wrote:
|     | Hi Dirk
|     |
|     | Thank you very much for your answer. It really helps.
|     |
|     | I want to call R from C++ in my project. If this is only a problem of R
|     version
|     | conflict,
|     | could I just ignore this "segmentation fault" info for the time being,
|     since I
|     | found that it seemed to impose no negative effect on c++ part, besides R
|     | calling, of my program(based on my experiment)?
| 
|     Yes indeed, see my follow-up on-list. Or you could quickly rebuild Rcpp
|     using
|     this version of the Rostream destructor:
| 
|             ~Rostream() {
|                 if (buf != NULL) {
|                     delete buf;
|                     buf = NULL;
|                 }
|             }
|    
|     Dirk
|    
|     | I am looking forward to the new version releasing, and thank you for your
|     | excellent jobs.
|     |
|     | Best Regards
|     |
|     | Cong Li
|     |
|     | On Tue, Dec 4, 2012 at 9:12 PM, Dirk Eddelbuettel <edd at debian.org> wrote:
|     |
|     |
|     |     Hi Cong,
|     |
|     |     On 4 December 2012 at 19:15, Cong Li wrote:
|     |     | Hi guys
|     |     |
|     |     | I am a novice to RInside, and I met a problem when trying to run
|     RInside
|     |     | example in "standard" folder.
|     |     |
|     |     | It is that a segmentation fault error happened every time when I
|     was
|     |     trying to
|     |     | execute the compiled example program in the "standard" folder. My
|     OS is
|     |     ubuntu
|     |     | 12.04, and I am using R 2.15.2 and g++ 4.6.3.
|     |     |
|     |     | It seems that the executions of the examples were fine, but
|     somehow
|     |     errors
|     |     | happened when then main function was trying to return.
|     |     |
|     |     | Can someone help me with this issue.
|     |
|     |     It is a change in R 2.15.2 which requires a change in RInside which
|     I have
|     |     yet to release (as another, unrelated, error) is holding this back.
|      If
|     |     you
|     |     use R 2.15.1 it all works too.
|     |
|     |     Sorry for this, and the new RInside should be there "soon", or I
|     should at
|     |     least commit my fixes to SVN.
|     |
|     |     Dirk
|     |
|     |     --
|     |     Dirk Eddelbuettel | edd at debian.org | http://dirk.eddelbuettel.com
|     |
|     |
| 
|     --
|     Dirk Eddelbuettel | edd at debian.org | http://dirk.eddelbuettel.com
| 
| 

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