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113 lines (97 loc) · 2.87 KB
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// Copyright David Abrahams 2002.
// 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)
#ifndef TO_PYTHON_INDIRECT_DWA200221_HPP
# define TO_PYTHON_INDIRECT_DWA200221_HPP
# include <boost/python/detail/prefix.hpp>
# include <boost/python/object/pointer_holder.hpp>
# include <boost/python/object/make_ptr_instance.hpp>
# include <boost/python/detail/none.hpp>
#ifndef BOOST_PYTHON_NO_PY_SIGNATURES
# include <boost/python/converter/pytype_function.hpp>
#endif
# include <boost/python/refcount.hpp>
# include <boost/type_traits/is_pointer.hpp>
# include <boost/type_traits/is_polymorphic.hpp>
# include <boost/mpl/bool.hpp>
# if defined(__ICL) && __ICL < 600
# include <boost/shared_ptr.hpp>
# else
# include <memory>
# endif
namespace boost { namespace python {
template <class T, class MakeHolder>
struct to_python_indirect
{
template <class U>
inline PyObject*
operator()(U const& ref) const
{
return this->execute(const_cast<U&>(ref), is_pointer<U>());
}
#ifndef BOOST_PYTHON_NO_PY_SIGNATURES
inline PyTypeObject const*
get_pytype()const
{
return converter::registered_pytype<T>::get_pytype();
}
#endif
private:
template <class U>
inline PyObject* execute(U* ptr, mpl::true_) const
{
// No special NULL treatment for references
if (ptr == 0)
return python::detail::none();
else
return this->execute(*ptr, mpl::false_());
}
template <class U>
inline PyObject* execute(U const& x, mpl::false_) const
{
U* const p = &const_cast<U&>(x);
if (is_polymorphic<U>::value)
{
if (PyObject* o = detail::wrapper_base_::owner(p))
return incref(o);
}
return MakeHolder::execute(p);
}
};
//
// implementations
//
namespace detail
{
struct make_owning_holder
{
template <class T>
static PyObject* execute(T* p)
{
// can't use auto_ptr with Intel 5 and VC6 Dinkum library
// for some reason. We get link errors against the auto_ptr
// copy constructor.
# if defined(__ICL) && __ICL < 600
typedef boost::shared_ptr<T> smart_pointer;
# else
typedef std::auto_ptr<T> smart_pointer;
# endif
typedef objects::pointer_holder<smart_pointer, T> holder_t;
smart_pointer ptr(const_cast<T*>(p));
return objects::make_ptr_instance<T, holder_t>::execute(ptr);
}
};
struct make_reference_holder
{
template <class T>
static PyObject* execute(T* p)
{
typedef objects::pointer_holder<T*, T> holder_t;
T* q = const_cast<T*>(p);
return objects::make_ptr_instance<T, holder_t>::execute(q);
}
};
}
}} // namespace boost::python
#endif // TO_PYTHON_INDIRECT_DWA200221_HPP