Another boost+python example

setup.py

#setup.py
from setuptools import setup
from setuptools.extension import Extension
import os.path
import sys


include_dirs = ["/usr/include/boost","."]
libraries=["boost_python-py27"]
library_dirs=['/usr/local/lib', "/usr/lib/python2.7"]

files = ["square.cpp", "wrapper.cpp"]

setup(name="square",    
      ext_modules=[
                    Extension("square",files,
                    library_dirs=library_dirs,
                    libraries=libraries,
                    include_dirs=include_dirs,
                    depends=[]),
                    ]
     )

square.cpp

#include <cmath>
#include "square.hpp"


void Square::set_side(double side){
    this->side = side;
    this->area = side*side;
}

void Square::set_area(double area){
    this->area = area;
    this->side = std::sqrt(area);
}

double Square::get_area(void){
    return this->area;
}

double Square::get_side(void){
    return this->side;
}

square.hpp

class Square{
private:
    double side;
    double area;

public:
    void set_area(double area);
    void set_side(double side);
    double get_area(void);
    double get_side(void);

};

wrapper.cpp

#include <Python.h>
#include <boost/python.hpp>

#include "square.hpp"
using namespace boost::python;


BOOST_PYTHON_MODULE(square)
{
    // Create the Python type object for our extension class
    class_<Square>("Square")
        .def("set_side", &Square::set_side)
        .def("set_area", &Square::set_area)
        .def("get_side", &Square::get_side)
        .def("get_area", &Square::get_area)

    ;
}