Some time ago, I asked on this list, if it is possible to use C++
libraries
under R. In fact this seems to be very easy (at least under Redhat 5.2,
egcs C++):
e.g.
Suppose we have a library
R_main.cc:
-------------------------------
#include "X.hh"
extern "C" {
void R_main ()
{
X x;
}
}
-------------------------------
X.hh
-------------------------------
class X
{
public:
X ();
~X ();
};
class Y
{
public:
Y ();
~Y ();
};
-------------------------------
X.cc:
-------------------------------
#include <iostream.h>
#include "X.hh"
static Y y;
X::X()
{
cout << "constructor X" << endl;
}
X::~X()
{
cout << "destructor X" << endl;
}
Y::Y()
{
cout << "constructor Y" << endl;
}
Y::~Y()
{
cout << "destructor Y" << endl;
}
--------------------------------
Compiled and linked by
45: g++ -c X.cc
46: g++ -c R_main.cc
47: g++ -shared -o X.so R_main.o X.o
Now starting R yields
R : Copyright 1999, The R Development Core Team
Version 0.63.2 (January 12, 1999)
...
Type "q()" to quit R.
>dyn.load("X.so")
constructor Y>.C("R_main")
constructor X
destructor X> q()
Save workspace image? [y/n/c]: y
destructor Y
...
However linking has to be done with g++, since with the gnu ld
ld -shared -o X.so R_main.o X.o
__main() and hence, the constructor of the static variable Y are not
called.
Adrian
--
Adrian Trapletti, Vienna University of Economics and Business
Administration, Augasse 2-6, A-1090 Vienna, Austria
Phone: ++43 1 31336 4561, Fax: ++43 1 31336 708,
Email: adrian.trapletti at wu-wien.ac.at
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