Boost C++ Libraries of the most highly regarded and expertly designed C++ library projects in the world. Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

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// Copyright Ralf W. Grosse-Kunstleve 2002-2004. Distributed under the Boost
// Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at

#include <boost/python/class.hpp>
#include <boost/python/module.hpp>
#include <boost/python/def.hpp>
#include <iostream>
#include <string>

namespace { // Avoid cluttering the global namespace.

  // A friendly class.
  class hello
      hello(const std::string& country) { this->country = country; }
      std::string greet() const { return "Hello from " + country; }
      std::string country;

  // A function taking a hello object as an argument.
  std::string invite(const hello& w) {
    return w.greet() + "! Please come soon!";

    using namespace boost::python;
    class_<hello>("hello", init<std::string>())
        // Add a regular member function.
        .def("greet", &hello::greet)
        // Add invite() as a member of hello!
        .def("invite", invite)
    // Also add invite() as a regular function to the module.
    def("invite", invite);