114 lines
2.9 KiB
C++
114 lines
2.9 KiB
C++
// Copyright David Abrahams 2002.
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// Distributed under the Boost Software License, Version 1.0. (See
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// accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#ifndef TO_PYTHON_INDIRECT_DWA200221_HPP
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# define TO_PYTHON_INDIRECT_DWA200221_HPP
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# include <boost/python/detail/prefix.hpp>
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# include <boost/python/object/pointer_holder.hpp>
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# include <boost/python/object/make_ptr_instance.hpp>
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# include <boost/python/detail/none.hpp>
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#ifndef BOOST_PYTHON_NO_PY_SIGNATURES
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# include <boost/python/converter/pytype_function.hpp>
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#endif
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# include <boost/python/refcount.hpp>
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# include <boost/type_traits/is_pointer.hpp>
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# include <boost/type_traits/is_polymorphic.hpp>
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# include <boost/mpl/bool.hpp>
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# if defined(__ICL) && __ICL < 600
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# include <boost/shared_ptr.hpp>
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# else
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# include <memory>
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# endif
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namespace boost { namespace python {
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template <class T, class MakeHolder>
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struct to_python_indirect
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{
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template <class U>
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inline PyObject*
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operator()(U const& ref) const
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{
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return this->execute(const_cast<U&>(ref), is_pointer<U>());
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}
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#ifndef BOOST_PYTHON_NO_PY_SIGNATURES
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inline PyTypeObject const*
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get_pytype()const
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{
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return converter::registered_pytype<T>::get_pytype();
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}
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#endif
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private:
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template <class U>
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inline PyObject* execute(U* ptr, mpl::true_) const
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{
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// No special NULL treatment for references
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if (ptr == 0)
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return python::detail::none();
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else
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return this->execute(*ptr, mpl::false_());
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}
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template <class U>
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inline PyObject* execute(U const& x, mpl::false_) const
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{
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U* const p = &const_cast<U&>(x);
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if (is_polymorphic<U>::value)
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{
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if (PyObject* o = detail::wrapper_base_::owner(p))
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return incref(o);
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}
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return MakeHolder::execute(p);
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}
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};
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//
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// implementations
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//
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namespace detail
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{
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struct make_owning_holder
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{
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template <class T>
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static PyObject* execute(T* p)
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{
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// can't use auto_ptr with Intel 5 and VC6 Dinkum library
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// for some reason. We get link errors against the auto_ptr
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// copy constructor.
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# if defined(__ICL) && __ICL < 600
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typedef boost::shared_ptr<T> smart_pointer;
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# else
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typedef std::auto_ptr<T> smart_pointer;
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# endif
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typedef objects::pointer_holder<smart_pointer, T> holder_t;
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smart_pointer ptr(const_cast<T*>(p));
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return objects::make_ptr_instance<T, holder_t>::execute(ptr);
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}
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};
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struct make_reference_holder
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{
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template <class T>
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static PyObject* execute(T* p)
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{
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typedef objects::pointer_holder<T*, T> holder_t;
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T* q = const_cast<T*>(p);
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return objects::make_ptr_instance<T, holder_t>::execute(q);
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}
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};
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}
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}} // namespace boost::python
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#endif // TO_PYTHON_INDIRECT_DWA200221_HPP
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