python/include/boost/python/return_opaque_pointer.hpp at develop · boostorg/python · GitHub

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// Copyright Gottfried Ganßauge 2003.

// 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)

* Generic Return value converter generator for opaque C++-pointers

# ifndef RETURN_OPAQUE_POINTER_HPP_

# define RETURN_OPAQUE_POINTER_HPP_

# include <boost/python/detail/prefix.hpp>

# include <boost/python/opaque_pointer_converter.hpp>

# include <boost/python/detail/force_instantiate.hpp>

# include <boost/python/to_python_value.hpp>

# include <boost/python/detail/value_arg.hpp>

# include <boost/mpl/assert.hpp>

namespace boost { namespace python {

namespace detail

{

template <class Pointee>

static void opaque_pointee(Pointee const volatile*)

{

force_instantiate(opaque<Pointee>::instance);

}

struct return_opaque_pointer

{

template <class R>

struct apply

{

BOOST_MPL_ASSERT_MSG( is_pointer<R>::value, RETURN_OPAQUE_POINTER_EXPECTS_A_POINTER_TYPE, (R));

struct type :

boost::python::to_python_value<

typename detail::value_arg<R>::type

{

type() { detail::opaque_pointee(R()); }

};

}} // namespace boost::python

# endif // RETURN_OPAQUE_POINTER_HPP_

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