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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
HANDLE_DWA200269_HPP
#
define
HANDLE_DWA200269_HPP
#
include
<
boost/python/detail/prefix.hpp
>
#
include
<
boost/python/cast.hpp
>
#
include
<
boost/python/errors.hpp
>
#
include
<
boost/python/borrowed.hpp
>
#
include
<
boost/python/handle_fwd.hpp
>
#
include
<
boost/python/refcount.hpp
>
#
include
<
boost/python/tag.hpp
>
#
include
<
boost/python/detail/raw_pyobject.hpp
>
namespace
boost
{
namespace
python
{
template
<
class
T
>
struct
null_ok
;
template
<
class
T
>
inline
null_ok<T>*
allow_null
(T* p)
{
return
(null_ok<T>*)p;
}
namespace
detail
{
template
<
class
T
>
inline
T*
manage_ptr
(detail::borrowed<null_ok<T> >* p,
int
)
{
return
python::xincref
((T*)p);
}
template
<
class
T
>
inline
T*
manage_ptr
(null_ok<detail::borrowed<T> >* p,
int
)
{
return
python::xincref
((T*)p);
}
template
<
class
T
>
inline
T*
manage_ptr
(detail::borrowed<T>* p,
long
)
{
return
python::incref
(
expect_non_null
((T*)p));
}
template
<
class
T
>
inline
T*
manage_ptr
(null_ok<T>* p,
long
)
{
return
(T*)p;
}
template
<
class
T
>
inline
T*
manage_ptr
(T* p, ...)
{
return
expect_non_null
(p);
}
}
template
<
class
T
>
class
handle
{
typedef
T* (handle::* bool_type )()
const
;
public:
//
types
typedef
T element_type;
public:
//
member functions
handle
();
~handle
();
template
<
class
Y
>
explicit
handle
(Y* p)
: m_p(
python::upcast<T>(
detail::manage_ptr
(p,
0
)
)
)
{
}
handle&
operator
=(handle
const
& r)
{
python::xdecref
(m_p);
m_p =
python::xincref
(r.
m_p
);
return
*
this
;
}
template
<
typename
Y>
handle&
operator
=(handle<Y>
const
& r)
//
never throws
{
python::xdecref
(m_p);
m_p =
python::xincref
(python::upcast<T>(r.
get
()));
return
*
this
;
}
template
<
typename
Y>
handle
(handle<Y>
const
& r)
: m_p(python::xincref(python::upcast<T>(r.get())))
{
}
handle
(handle
const
& r)
: m_p(python::xincref(r.m_p))
{
}
T*
operator
-> ()
const
;
T&
operator
* ()
const
;
T*
get
()
const
;
T*
release
();
void
reset
();
operator
bool_type
()
const
//
never throws
{
return
m_p ? &handle<T>::get :
0
;
}
bool
operator
! ()
const
;
//
never throws
public:
//
implementation details -- do not touch
//
Defining this in the class body suppresses a VC7 link failure
inline
handle
(detail::borrowed_reference x)
: m_p(
python::incref
(
downcast<T>((PyObject*)x)
))
{
}
private:
//
data members
T* m_p;
};
#
ifdef
BOOST_NO_ARGUMENT_DEPENDENT_LOOKUP
}
//
namespace python
#
endif
template
<
class
T
>
inline
T *
get_pointer
(python::handle<T>
const
& p)
{
return
p.
get
();
}
#
ifdef
BOOST_NO_ARGUMENT_DEPENDENT_LOOKUP
namespace
python
{
#
else
//
We don't want get_pointer above to hide the others
using
boost::get_pointer;
#endif
typedef
handle<PyTypeObject> type_handle;
//
//
Compile-time introspection
//
template
<
typename
T>
class
is_handle
{
public:
BOOST_STATIC_CONSTANT
(
bool
, value =
false
);
};
template
<
typename
T>
class
is_handle
<handle<T> >
{
public:
BOOST_STATIC_CONSTANT
(
bool
, value =
true
);
};
//
//
implementations
//
template
<
class
T
>
inline
handle<T>::handle()
: m_p(
0
)
{
}
template
<
class
T
>
inline
handle<T>::
~handle
()
{
python::xdecref
(m_p);
}
template
<
class
T
>
inline
T* handle<T>::
operator
->()
const
{
return
m_p;
}
template
<
class
T
>
inline
T& handle<T>::
operator
*()
const
{
return
*m_p;
}
template
<
class
T
>
inline
T* handle<T>::get()
const
{
return
m_p;
}
template
<
class
T
>
inline
bool
handle<T>::
operator
!()
const
{
return
m_p ==
0
;
}
template
<
class
T
>
inline
T* handle<T>::release()
{
T* result = m_p;
m_p =
0
;
return
result;
}
template
<
class
T
>
inline
void
handle<T>::reset()
{
python::xdecref
(m_p);
m_p =
0
;
}
//
Because get_managed_object must return a non-null PyObject*, we
//
return Py_None if the handle is null.
template
<
class
T
>
inline
PyObject*
get_managed_object
(handle<T>
const
& h,
tag_t
)
{
return
h.
get
() ? python::upcast<PyObject>(h.
get
()) : Py_None;
}
}}
//
namespace boost::python
#
endif
//
HANDLE_DWA200269_HPP
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