Boost.Python example

hello.cxx

// compile by: g++ hello.cxx -shared -fPIC -o hello.so -I/usr/include/python2.7 -lboost_python
#include <string>
#include <boost/python.hpp>

using std::string;
using namespace boost::python;

string hello() { return "Hello, world!"; }

// add a argument
string hello(const string &str) { return "hello " + str; }

// add two different type arguments
string hello(const string &str, int x) {
    string tmp = "hello ";
    for (int i=0; i<x; ++i) { tmp += str + " "; }
    return tmp;
}

string (*fp1)() = hello;
string (*fp2)(const string &str) = hello;
string (*fp3)(const string &str, int x) = hello;

class demo_class {
private:
    string msg;
public:
    static string s_hello;
    demo_class(): msg("boost") {}
    string hellox(int x = 1) {
        string tmp = s_hello;
        for(int i=0; i<x; i++) { tmp += msg + " "; }
        return tmp;
    }
};
string demo_class::s_hello = "hello";

BOOST_PYTHON_MODULE(hello)
{
    def("hello", fp1, "Welcome !");
    def("hello", fp2, arg("str"));
    def("hello", fp3, ("str", "x"));

    class_<demo_class>("demo", "doc string")
            .def("hello", &demo_class::hellox, arg("x") = 1)
            .def_readwrite("shello", &demo_class::s_hello);
}