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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 http://www.boost.org/LICENSE_1_0.txt)
#include <boost/python/module.hpp>
#include <boost/python/def.hpp>
#include <boost/python/tuple.hpp>
#include <boost/python/to_python_converter.hpp>
namespace { // Avoid cluttering the global namespace.
// Converts a std::pair instance to a Python tuple.
template <typename T1, typename T2>
struct std_pair_to_tuple
{
static PyObject* convert(std::pair<T1, T2> const& p)
{
return boost::python::incref(
boost::python::make_tuple(p.first, p.second).ptr());
}
static PyTypeObject const *get_pytype () {return &PyTuple_Type; }
};
// Helper for convenience.
template <typename T1, typename T2>
struct std_pair_to_python_converter
{
std_pair_to_python_converter()
{
boost::python::to_python_converter<
std::pair<T1, T2>,
std_pair_to_tuple<T1, T2>,
true //std_pair_to_tuple has get_pytype
>();
}
};
// Example function returning a std::pair.
std::pair<int, int>
foo() { return std::pair<int, int>(3, 5); }
} // namespace anonymous
BOOST_PYTHON_MODULE(std_pair_ext)
{
using namespace boost::python;
std_pair_to_python_converter<int, int>();
def("foo", foo);
}
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