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+// Copyright David Abrahams 2001.
+// 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)
+
+// This module exercises the converters exposed in m1 at a low level
+// by exposing raw Python extension functions that use wrap<> and
+// unwrap<> objects.
+#include <boost/python/module.hpp>
+#include <boost/python/def.hpp>
+#include <boost/python/copy_non_const_reference.hpp>
+#include <boost/python/copy_const_reference.hpp>
+#include <boost/python/return_value_policy.hpp>
+#include "simple_type.hpp"
+
+#if PY_VERSION_HEX >= 0x03000000
+# define PyString_FromString PyUnicode_FromString
+# define PyInt_FromLong PyLong_FromLong
+#endif
+
+// Get a simple (by value) from the argument, and return the
+// string it holds.
+PyObject* unwrap_simple(simple x)
+{
+ return PyString_FromString(x.s);
+}
+
+// Likewise, but demands that its possible to get a non-const
+// reference to the simple.
+PyObject* unwrap_simple_ref(simple& x)
+{
+ return PyString_FromString(x.s);
+}
+
+// Likewise, with a const reference to the simple object.
+PyObject* unwrap_simple_const_ref(simple const& x)
+{
+ return PyString_FromString(x.s);
+}
+
+// Get an int (by value) from the argument, and convert it to a
+// Python Int.
+PyObject* unwrap_int(int x)
+{
+ return PyInt_FromLong(x);
+}
+
+// Get a non-const reference to an int from the argument
+PyObject* unwrap_int_ref(int& x)
+{
+ return PyInt_FromLong(x);
+}
+
+// Get a const reference to an int from the argument.
+PyObject* unwrap_int_const_ref(int const& x)
+{
+ return PyInt_FromLong(x);
+}
+
+#if PY_VERSION_HEX >= 0x03000000
+# undef PyString_FromString
+# undef PyInt_FromLong
+#endif
+
+// rewrap<T> extracts a T from the argument, then converts the T back
+// to a PyObject* and returns it.
+template <class T>
+struct rewrap
+{
+ static T f(T x) { return x; }
+};
+
+BOOST_PYTHON_MODULE(m2)
+{
+ using boost::python::return_value_policy;
+ using boost::python::copy_const_reference;
+ using boost::python::copy_non_const_reference;
+ using boost::python::def;
+
+ def("unwrap_int", unwrap_int);
+ def("unwrap_int_ref", unwrap_int_ref);
+ def("unwrap_int_const_ref", unwrap_int_const_ref);
+ def("unwrap_simple", unwrap_simple);
+ def("unwrap_simple_ref", unwrap_simple_ref);
+ def("unwrap_simple_const_ref", unwrap_simple_const_ref);
+
+ def("wrap_int", &rewrap<int>::f);
+
+ def("wrap_int_ref", &rewrap<int&>::f
+ , return_value_policy<copy_non_const_reference>()
+ );
+
+ def("wrap_int_const_ref", &rewrap<int const&>::f
+ , return_value_policy<copy_const_reference>()
+ );
+
+ def("wrap_simple", &rewrap<simple>::f);
+
+ def("wrap_simple_ref", &rewrap<simple&>::f
+ , return_value_policy<copy_non_const_reference>()
+ );
+
+ def("wrap_simple_const_ref", &rewrap<simple const&>::f
+ , return_value_policy<copy_const_reference>()
+ );
+}
+
+#include "module_tail.cpp"