bindings/python/src/optional.hpp

   1 // Copyright Daniel Wallin 2007. Use, modification and distribution is
   2 // subject to the Boost Software License, Version 1.0. (See accompanying
   3 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   4
   5 #ifndef OPTIONAL_070108_HPP
   6 # define OPTIONAL_070108_HPP
   7
   8 # include <boost/python.hpp>
   9 # include <boost/optional.hpp>
  10
  11 template <class T>
  12 struct optional_to_python
  13 {
  14     optional_to_python()
  15     {
  16         boost::python::to_python_converter<
  17             boost::optional<T>, optional_to_python<T>
  18         >();
  19     }
  20
  21     static PyObject* convert(boost::optional<T> const& x)
  22     {
  23         if (!x)
  24             return boost::python::incref(Py_None);
  25
  26         return boost::python::incref(boost::python::object(*x).ptr());
  27     }
  28 };
  29
  30 #endif // OPTIONAL_070108_HPP
  31