SIP Python/C++ binding fails to compile

[davidraimosson]

Hi all!

After successfully compiling a Python/C binding with SIP I wanted to do the same thing with Python/C++. For some reason this doesn't work.

Here's the files:

fib.cpp
-----------------------------------------------

#include "fib.h"
 
int fib1(int n)
{
    if (n <= 0) {
        return 0;
    } else if (n <= 2) {
        return 1;
    } else {
        return fib1(n-1) + fib1(n-2);
    }
}
 

fib.h
-----------------------------------------------

int fib1(int n);
 

fib.sip
-----------------------------------------------

%Module fib
 
%Include fib.h
 

I run the following command to build the intermediate files:
sip -c . fib.sip

So far everything works.

Now I want to build the .pyd file using distutils.

setup.py
-----------------------------------------------

from distutils.core import setup, Extension
import sipdistutils
 
setup(
  name = 'fib',
  versione = '1.0',
  ext_modules=[
    Extension("fib", ["fib.sip", "fib.cpp"]),
    ],
 
  cmdclass = {'build_ext': sipdistutils.build_ext}
)
 

I run the following command:
python setup.py build

This fails with the following error:
build\temp.win32-2.7\Release\sipfibcmodule.cpp:29:29: error: 'fib1' was not declared in this scope
error: command 'gcc' failed with exit status 1

What could the problem be? Shouldn't c++ be used as a compiler instead of gcc, by the way?

Any help appreciated!

Kind regards

David

[davidraimosson]

I've found a solution that is good enough: namespaces. Next time I'll read the documentation better. I should also mention that a solution with a Fibonacci class could solve the problem, but I didn't find that to be satisfying.

Below the content of the files can be found.

fib.cpp

#include "fib.h" 
 
namespace test 
{ 
    int fib1(int n) 
    { 
        if (n <= 0) { 
            return 0; 
        } else if (n <= 2) { 
            return 1; 
        } else { 
            return fib1(n-1) + fib1(n-2); 
        } 
    } 
}
 

fib.h

namespace test 
{ 
    int fib1(int n); 
}
 

fib.sip

%Module fib 
 
namespace test { 
    %TypeHeaderCode 
    #include "fib.h" 
    %End 
 
    int fib1(int n); 
}; 
 

setup.py was left untouched.

Exactly the same commands as mentioned before were used.