[Rcpp-devel] Simple project segfaults

Berry Kriesels berry at exisoft.nl
Fri Mar 29 10:24:43 CET 2013

Hi again,

Later on I realised I had made some fundamental programming errors 
resulting in the mentioned segfault entirely not related to rcpp. (fixed 
now by the way).
I know that does not earn me many brownie points, so my apologies for my 
sloppy code. ;)

Thus far I can say that I still really like the rcpp package and keep 
thinking of new ways I could use it.


On 03/20/2013 11:15 PM, Berry Kriesels wrote:
> Hi everybody,
> Just now I was playing around with Rcpp in combination with Qt (I have 
> found an excellent example on this). And decided to have a go(small 
> dummyproject) at this myself.  Problem is that the application 
> segfaults when I run it.
> QtR.h
> http://pastebin.com/AXT144SK
> QtR.cpp
> http://pastebin.com/JUUuCFN2
> main.cpp
> http://pastebin.com/yWUmDL17
> mainwindow.cpp
> http://pastebin.com/gE84ZtxH
> I create an instance of my QtR class called qtr which creates an 
> RInside session in the constructor. In my mainwindow.cpp I reference 
> to my instance of qtr and then invoke the loadData method. In the 
> loadData method I try to use 
> m_R.parseEvalQ("cat("+fname_no_ext+"',file='outfile.txt',sep='\n')");
> This results in a segfault.
> However when I remove this line from the loadData method and add the 
> m_R.parseEvalQ("cat("+fname_no_ext+"',file='outfile.txt',sep='\n')"); 
> line to the constructor of QtR which is invoked in main.cpp it runs 
> without trouble.
> I probably am making a very obvious mistake. But I seem unable to see 
> the issue at this point myself.
> Berry
> PS
> I have used pastebin for readability, or would everybody prefer the 
> code within the e-mail?
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