python/include/boost/python/opaque_pointer_converter.hpp at python313 · boostorg/python · GitHub

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// Copyright Gottfried Ganßauge 2003..2006.

// 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 Conversion of opaque C++-pointers to a Python-Wrapper.

# ifndef OPAQUE_POINTER_CONVERTER_HPP_

# define OPAQUE_POINTER_CONVERTER_HPP_

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

# include <boost/python/lvalue_from_pytype.hpp>

# include <boost/python/to_python_converter.hpp>

# include <boost/python/converter/registrations.hpp>

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

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

# include <boost/python/detail/none.hpp>

# include <boost/python/type_id.hpp>

# include <boost/python/errors.hpp>

# include <boost/implicit_cast.hpp>

# include <boost/mpl/eval_if.hpp>

# include <boost/mpl/identity.hpp>

# include <boost/mpl/assert.hpp>

// opaque --

// registers to- and from- python conversions for a type Pointee.

// Note:

// In addition you need to define specializations for type_id

// on the type pointed to by Pointer using

// BOOST_PYTHON_OPAQUE_SPECIALIZED_TYPE_ID(Pointee)

// For an example see libs/python/test/opaque.cpp

namespace boost { namespace python {

template <class Pointee>

struct opaque

{

opaque()

{

if (type_object.tp_name == 0)

{

type_object.tp_name = const_cast<char*>(type_id<Pointee*>().name());

if (PyType_Ready (&type_object) < 0)

{

throw error_already_set();

}

this->register_self();

}

static opaque instance;

private:

static void* extract(PyObject* op)

{

return PyObject_TypeCheck(op, &type_object)

? static_cast<python_instance*>(implicit_cast<void*>(op))->x

: 0

;

}

static PyObject* wrap(void const* px)

{

Pointee* x = *static_cast<Pointee*const*>(px);

if (x == 0)

return detail::none();

if ( python_instance *o = PyObject_New(python_instance, &type_object) )

{

o->x = x;

return static_cast<PyObject*>(implicit_cast<void*>(o));

}

else

{

throw error_already_set();

}

void register_self()

{

converter::registration const *existing =

converter::registry::query (type_id<Pointee*>());

if ((existing == 0) || (existing->m_to_python == 0))

{

#ifndef BOOST_PYTHON_NO_PY_SIGNATURES

converter::registry::insert(&extract, type_id<Pointee>(), &get_pytype);

converter::registry::insert(&wrap, type_id<Pointee*>(), &get_pytype);

#else

converter::registry::insert(&extract, type_id<Pointee>());

converter::registry::insert(&wrap, type_id<Pointee*>());

#endif

}

struct python_instance

{

PyObject_HEAD

Pointee* x;

};

static PyTypeObject type_object;

#ifndef BOOST_PYTHON_NO_PY_SIGNATURES

static PyTypeObject const *get_pytype(){return &type_object; }

#endif

};

template <class Pointee>

opaque<Pointee> opaque<Pointee>::instance;

template <class Pointee>

PyTypeObject opaque<Pointee>::type_object =

{

PyVarObject_HEAD_INIT(NULL, 0)

sizeof( BOOST_DEDUCED_TYPENAME opaque<Pointee>::python_instance ),

::boost::python::detail::dealloc,

0, /* tp_print */

0, /* tp_getattr */

0, /* tp_setattr */

0, /* tp_compare */

0, /* tp_repr */

0, /* tp_as_number */

0, /* tp_as_sequence */

0, /* tp_as_mapping */

0, /* tp_hash */

0, /* tp_call */

0, /* tp_str */

0, /* tp_getattro */

0, /* tp_setattro */

0, /* tp_as_buffer */

0, /* tp_flags */

0, /* tp_doc */

0, /* tp_traverse */

0, /* tp_clear */

0, /* tp_richcompare */

0, /* tp_weaklistoffset */

0, /* tp_iter */

0, /* tp_iternext */

0, /* tp_methods */

0, /* tp_members */

0, /* tp_getset */

0, /* tp_base */

0, /* tp_dict */

0, /* tp_descr_get */

0, /* tp_descr_set */

0, /* tp_dictoffset */

0, /* tp_init */

0, /* tp_alloc */

0, /* tp_new */

0, /* tp_free */

0, /* tp_is_gc */

0, /* tp_bases */

0, /* tp_mro */

0, /* tp_cache */

0, /* tp_subclasses */

0, /* tp_weaklist */

#if PYTHON_API_VERSION >= 1012

0 /* tp_del */

#endif

};

}} // namespace boost::python

// If you change the below, don't forget to alter the end of type_id.hpp

# define BOOST_PYTHON_OPAQUE_SPECIALIZED_TYPE_ID(Pointee) \

namespace boost { namespace python { \

template<> \

inline type_info type_id<Pointee>() \

{ \

return type_info (typeid (Pointee *)); \

} \

template<> \

inline type_info type_id<const volatile Pointee&>() \

{ \

return type_info (typeid (Pointee *)); \

} \

}}

# endif // OPAQUE_POINTER_CONVERTER_HPP_

python/include/boost/python/opaque_pointer_converter.hpp at python313 · boostorg/python · GitHub

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