R help - Jan 2005 - Rinternals.h and iostream don't play nice together'

Hi,

Consider the following file.

*******************************
foo.cc
*******************************
#include <R.h>
#include <Rinternals.h>
#include <iostream>
*******************************

R CMD SHLIB foo.cc

gives scads of errors. I've use C++ extensively with R before (using C 
linkage) but not with Rinternals.h. I'm puzzled. The errors make no sense 
to me. Am I doing something wrong? Is it impossible to use iostream here 
for some reason?

I'm using Debian Sarge with R 2.0.1 and gcc 3.3.5. Please cc me; I'm not
subscribed. Thanks in advance.

                                                               Faheem.

R CMD SHLIB foo.cc
g++ -I/usr/lib/R/include     -fPIC  -g -O2 -c foo.cc -o foo.o
************************************************************************
In file included from /usr/include/c++/3.3/bits/locale_facets.h:528,
                  from /usr/include/c++/3.3/bits/basic_ios.h:44,
                  from /usr/include/c++/3.3/ios:51,
                  from /usr/include/c++/3.3/ostream:45,
                  from /usr/include/c++/3.3/iostream:45,
                  from foo.cc:3:
/usr/include/c++/3.3/bits/codecvt.h:110:52: macro "length" passed 4
arguments, but takes just 1
In file included from /usr/include/c++/3.3/bits/locale_facets.h:528,
                  from /usr/include/c++/3.3/bits/basic_ios.h:44,
                  from /usr/include/c++/3.3/ios:51,
                  from /usr/include/c++/3.3/ostream:45,
                  from /usr/include/c++/3.3/iostream:45,
                  from foo.cc:3:
/usr/include/c++/3.3/bits/codecvt.h:109: error: parse error before `const'
/usr/include/c++/3.3/bits/codecvt.h:113: error: semicolon missing after
    declaration of `std::__codecvt_abstract_base<_InternT, _ExternT,
_StateT>'
/usr/include/c++/3.3/bits/codecvt.h:115: error: ISO C++ forbids defining types
    within return type
/usr/include/c++/3.3/bits/codecvt.h:115: error: extraneous `int' ignored
/usr/include/c++/3.3/bits/codecvt.h:115: error: non-member function `
    std::__codecvt_abstract_base<_InternT, _ExternT, _StateT>
std::max_length()'
    cannot have `const' method qualifier
/usr/include/c++/3.3/bits/codecvt.h:115: error: semicolon missing after
    declaration of `class std::__codecvt_abstract_base<_InternT, _ExternT,
    _StateT>'
/usr/include/c++/3.3/bits/codecvt.h: In function `int std::max_length()':
/usr/include/c++/3.3/bits/codecvt.h:115: error: invalid use of `this' in
    non-member function
/usr/include/c++/3.3/bits/codecvt.h: At global scope:
/usr/include/c++/3.3/bits/codecvt.h:117: error: parse error before
`protected'
/usr/include/c++/3.3/bits/codecvt.h:122: error: destructors must be member
    functions
/usr/include/c++/3.3/bits/codecvt.h:122: error: virtual outside class
    declaration
/usr/include/c++/3.3/bits/codecvt.h: In function `void
    std::__codecvt_abstract_base()':
/usr/include/c++/3.3/bits/codecvt.h:122: error: `void
    std::__codecvt_abstract_base()' redeclared as different kind of symbol
/usr/include/c++/3.3/bits/codecvt.h:65: error: previous declaration of `
    template<class _InternT, class _ExternT, class _StateT> class
    std::__codecvt_abstract_base<_InternT,_ExternT,_StateT>'
/usr/include/c++/3.3/bits/codecvt.h:65: error: previous non-function
    declaration `template<class _InternT, class _ExternT, class _StateT>
class
    std::__codecvt_abstract_base<_InternT,_ExternT,_StateT>'
/usr/include/c++/3.3/bits/codecvt.h:122: error: conflicts with function
    declaration `void std::__codecvt_abstract_base()'
/usr/include/c++/3.3/bits/codecvt.h: At global scope:
/usr/include/c++/3.3/bits/codecvt.h:125: error: syntax error before `('
token
/usr/include/c++/3.3/bits/codecvt.h:131: error: syntax error before `('
token
/usr/include/c++/3.3/bits/codecvt.h:135: error: syntax error before `('
token
/usr/include/c++/3.3/bits/codecvt.h:141: error: virtual outside class
    declaration
/usr/include/c++/3.3/bits/codecvt.h:141: error: non-member function `int
    std::do_encoding()' cannot have `const' method qualifier
/usr/include/c++/3.3/bits/codecvt.h:141: error: function `int
    std::do_encoding()' is initialized like a variable
/usr/include/c++/3.3/bits/codecvt.h:144: error: virtual outside class
    declaration
/usr/include/c++/3.3/bits/codecvt.h:144: error: non-member function `bool
    std::do_always_noconv()' cannot have `const' method qualifier
/usr/include/c++/3.3/bits/codecvt.h:144: error: function `bool
    std::do_always_noconv()' is initialized like a variable
/usr/include/c++/3.3/bits/codecvt.h:147: error: parse error before `&'
token
/usr/include/c++/3.3/bits/codecvt.h:148: error: virtual outside class
    declaration
/usr/include/c++/3.3/bits/codecvt.h:148: error: non-member function `int
    std::do_length(...)' cannot have `const' method qualifier
/usr/include/c++/3.3/bits/codecvt.h:148: error: function `int
    std::do_length(...)' is initialized like a variable
/usr/include/c++/3.3/bits/codecvt.h:151: error: virtual outside class
    declaration
/usr/include/c++/3.3/bits/codecvt.h:151: error: non-member function `int
    std::do_max_length()' cannot have `const' method qualifier
/usr/include/c++/3.3/bits/codecvt.h:151: error: function `int
    std::do_max_length()' is initialized like a variable
/usr/include/c++/3.3/bits/codecvt.h:158: error: parse error before `<'
token
/usr/include/c++/3.3/bits/codecvt.h:163: error: syntax error before `;'
token
/usr/include/c++/3.3/bits/codecvt.h:164: error: syntax error before `;'
token
/usr/include/c++/3.3/bits/codecvt.h:165: error: syntax error before `;'
token
/usr/include/c++/3.3/bits/codecvt.h:172: error: only declarations of
    constructors can be `explicit'
/usr/include/c++/3.3/bits/codecvt.h: In function `int codecvt(unsigned
int)':
/usr/include/c++/3.3/bits/codecvt.h:172: error: `int codecvt(unsigned int)'
    redeclared as different kind of symbol
/usr/include/c++/3.3/bits/codecvt.h:158: error: previous declaration of `
    template<class _InternT, class _ExternT, class _StateT> class
codecvt'
/usr/include/c++/3.3/bits/codecvt.h:158: error: previous non-function
    declaration `template<class _InternT, class _ExternT, class _StateT>
class
    codecvt'
/usr/include/c++/3.3/bits/codecvt.h:172: error: conflicts with function
    declaration `int codecvt(unsigned int)'
/usr/include/c++/3.3/bits/codecvt.h:172: error: only constructors take base
    initializers
/usr/include/c++/3.3/bits/codecvt.h:172: error: parse error before `<'
token
/usr/include/c++/3.3/bits/codecvt.h:172: confused by earlier errors, bailing out
make: *** [foo.o] Error 1

On 30 January 2005 at 18:03, Faheem Mitha wrote:
| Consider the following file.
| 
| *******************************
| foo.cc
| *******************************
| #include <R.h>
| #include <Rinternals.h>
| #include <iostream>
| *******************************
| 
| R CMD SHLIB foo.cc

Two changes are required: You absolutely do need extern "C" ... to get
C
headers in with C++, and the other is a simple reordering -- not sure where I
learned that can help at times ...

edd at basebud:/tmp> cat foo.cc
#include <iostream>
extern "C" {
  #include <R.h>
  #include <Rinternals.h>
}
edd at basebud:/tmp> R CMD SHLIB foo.cc
g++ -shared  -o foo.so foo.o   -L/usr/lib/R/lib -lR
edd at basebud:/tmp> ls -l foo.so
-rwxr-xr-x  1 edd edd 117872 Jan 30 17:16 foo.so
edd at basebud:/tmp>

Hth, Dirk

-- 
Better to have an approximate answer to the right question than a precise 
answer to the wrong question.  --  John Tukey as quoted by John Chambers

On Sun, 30 Jan 2005, Faheem Mitha wrote:
> Consider the following file.
>
> *******************************
> foo.cc
> *******************************
> #include <R.h>
and if you use the following instead of "Rinternals.h"?
extern "C" {
#include <Rdefines.h>
}
> #include <Rinternals.h>
> #include <iostream>
> *******************************
>
> R CMD SHLIB foo.cc
>
> gives scads of errors. I've use C++ extensively with R before (using C
> linkage) but not with Rinternals.h. I'm puzzled. The errors make no
sense
> to me. Am I doing something wrong? Is it impossible to use iostream here
> for some reason?
> [SNIP lots of error messages]
'Course I'm assuming you read that part in the 'R-exts.pdf'
about using C++ iostreams with R being best avoided? If you
really need to do so anyway, I'll give you a link to my iostream
manipulator source that interfaces with the R console. It handles
the scenario described in section 4.6 of above document but
requires the GNU C++ compiler (g++) in order to work though.

----------------------------------------------------------
SIGSIG -- signature too long (core dumped)