[Rd] Problem using ofstream in C++ class in package for MacOS X

Dirk Eddelbuettel edd at debian.org
Sun Feb 4 20:43:21 CET 2007

On 4 February 2007 at 20:17, cstrato wrote:
| I am currently learning how to create R packages using C++ classes.

Congratulations :)    

[ This reminds me to email Oleg (CC'ed). Oleg, your HOWTO is a very useful.
Would you consider adding a section on Dominick's most excellent RcppTemplate
package which makes writing code to go back and forth between R and C++ soooo
much easier?  ]

| For this purpose I have written a small package MyClass (which I try
| to attach since I do not have access to a website).
| While I can compile and execute my package w/o problems on Fedora Core 4,

Works for me too on Debian.

|  > writeFileCpp("myout_fileCpp.txt")
| [1] "outfile =  myout_fileCpp.txt"
| Writing file myout_fileCpp.txt using C++ style.
| ---MyClassA::MyClassA()---------
| ---MyClassA::WriteFileCpp---------
|  *** caught bus error ***
| address 0x6, cause 'non-existent physical address'
| Traceback:
|  1: .C("WriteFileCpp", as.character(outfile), PACKAGE = "MyClass")
|  2: writeFileCpp("myout_fileCpp.txt")
| While I understand, that C++ iostreams are best avoided, since there is
| no guarantee that the output will appear in the R console (as mentioned
| on page 62 of R-exts.pdf), I do not understand why I cannot use ofstream,
| which is isolated in a C++ method only.
| Is there a way how to use ofstream on MacOS X or is this a limit of the
| current Mac implementation?

Can you get to this in a debugger on MacOS X?  Just glancing at your code I
saw nothing obviously sticking out...

Hell, there are no rules here - we're trying to accomplish something. 
                                                  -- Thomas A. Edison

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